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diff --git a/ops/kontemplate/.gitignore b/ops/kontemplate/.gitignore new file mode 100644 index 000000000000..53a04aab3a89 --- /dev/null +++ b/ops/kontemplate/.gitignore @@ -0,0 +1,2 @@ +.idea/ +release/ diff --git a/ops/kontemplate/LICENSE b/ops/kontemplate/LICENSE new file mode 100644 index 000000000000..94a9ed024d38 --- /dev/null +++ b/ops/kontemplate/LICENSE @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/> + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +<http://www.gnu.org/licenses/>. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +<http://www.gnu.org/philosophy/why-not-lgpl.html>. diff --git a/ops/kontemplate/README.md b/ops/kontemplate/README.md new file mode 100644 index 000000000000..f95c9a1e0d47 --- /dev/null +++ b/ops/kontemplate/README.md @@ -0,0 +1,190 @@ +Kontemplate - A simple Kubernetes templater +=========================================== + +[](https://travis-ci.org/tazjin/kontemplate) + +[Kontemplate][] is a simple CLI tool that can take sets of Kubernetes resource +files with placeholders and insert values per environment. + +This tool was made because in many cases all I want in terms of Kubernetes +configuration is simple value interpolation per environment (i.e. Kubernetes +cluster), but with the same deployment files. + +In my experience this is often enough and more complex solutions such as +[Helm][] are not required. + +Check out a Kontemplate setup example and the feature list below! + +<!-- markdown-toc start - Don't edit this section. Run M-x markdown-toc-refresh-toc --> +**Table of Contents** + +- [Kontemplate - A simple Kubernetes templater](#kontemplate---a-simple-kubernetes-templater) + - [Features](#features) + - [Example](#example) + - [Installation](#installation) + - [Homebrew](#homebrew) + - [Arch Linux](#arch-linux) + - [Building repeatably from source](#building-repeatably-from-source) + - [Building from source](#building-from-source) + - [Usage](#usage) + - [Contributing](#contributing) + +<!-- markdown-toc end --> + +## Features + +* [Simple, yet powerful templates](docs/templates.md) +* [Clean cluster configuration files](docs/cluster-config.md) +* [Resources organised as simple resource sets](docs/resource-sets.md) +* Integration with pass +* Integration with kubectl + +## Example + +Kontemplate lets you describe resources as you normally would in a simple folder structure: + +``` +. +├── prod-cluster.yaml +└── some-api + ├── deployment.yaml + └── service.yaml +``` + +This example has all resources belonging to `some-api` (no file naming conventions enforced at all!) in the `some-api` +folder and the configuration for the cluster `prod-cluster` in the corresponding file. + +Lets take a short look at `prod-cluster.yaml`: + +```yaml +--- +context: k8s.prod.mydomain.com +global: + globalVar: lizards +include: + - name: some-api + values: + version: 1.0-0e6884d + importantFeature: true + apiPort: 4567 +``` + +Those values are then templated into the resource files of `some-api`. That's it! + +You can also set up more complicated folder structures for organisation, for example: + +``` +. +├── api +│ ├── image-api +│ │ └── deployment.yaml +│ └── music-api +│ └── deployment.yaml +│ │ └── default.json +├── frontend +│ ├── main-app +│ │ ├── deployment.yaml +│ │ └── service.yaml +│ └── user-page +│ ├── deployment.yaml +│ └── service.yaml +├── prod-cluster.yaml +└── test-cluster.yaml +``` + +And selectively template or apply resources with a command such as +`kontemplate apply test-cluster.yaml --include api --include frontend/user-page` +to only update the `api` resource sets and the `frontend/user-page` resource set. + +## Installation + +It is recommended to install Kontemplate from the signed binary releases available on the +[releases page][]. Release binaries are available for Linux, OS X, FreeBSD and Windows. + +### Homebrew + +OS X users with Homebrew installed can "tap" Kontemplate like such: + +```sh +brew tap tazjin/kontemplate https://github.com/tazjin/kontemplate +brew install kontemplate +``` + +### NixOS + +Kontemplate has been included in [NixOS](https://nixos.org/) since version 17.09. + +It is available as `kontemplate` from the default Nix package set. + +### Arch Linux + +An [AUR package][] is available for Arch Linux and other `pacman`-based distributions. + +### Building from source + +Assuming you have Go configured correctly, you can simply `go get github.com/tazjin/kontemplate/...`. + +## Usage + +You must have `kubectl` installed to use Kontemplate effectively. + +``` +usage: kontemplate [<flags>] <command> [<args> ...] + +simple Kubernetes resource templating + +Flags: + -h, --help Show context-sensitive help (also try --help-long and --help-man). + -i, --include=INCLUDE ... Resource sets to include explicitly + -e, --exclude=EXCLUDE ... Resource sets to exclude explicitly + +Commands: + help [<command>...] + Show help. + + template <file> + Template resource sets and print them + + apply [<flags>] <file> + Template resources and pass to 'kubectl apply' + + replace <file> + Template resources and pass to 'kubectl replace' + + delete <file> + Template resources and pass to 'kubectl delete' + + create <file> + Template resources and pass to 'kubectl create' + +``` + +Examples: + +``` +# Look at output for a specific resource set and check to see if it's correct ... +kontemplate template example/prod-cluster.yaml -i some-api + +# ... maybe do a dry-run to see what kubectl would do: +kontemplate apply example/prod-cluster.yaml --dry-run + +# And actually apply it if you like what you see: +kontemplate apply example/prod-cluster.yaml +``` + +Check out the feature list and the individual feature documentation above. Then you should be good to go! + +## Contributing + +Feel free to contribute pull requests, file bugs and open issues with feature suggestions! + +Kontemplate is licensed under the GPLv3, a copy of the license and its terms can be found +in the `LICENSE` file. + +Please follow the [code of conduct](CODE_OF_CONDUCT.md). + +[Kontemplate]: http://kontemplate.works +[Helm]: https://helm.sh/ +[releases page]: https://github.com/tazjin/kontemplate/releases +[AUR package]: https://aur.archlinux.org/packages/kontemplate-git/ +[Repeatr]: http://repeatr.io/ diff --git a/ops/kontemplate/build-release.sh b/ops/kontemplate/build-release.sh new file mode 100755 index 000000000000..e4258c53dd09 --- /dev/null +++ b/ops/kontemplate/build-release.sh @@ -0,0 +1,75 @@ +#!/usr/bin/env bash +set -ueo pipefail + +# Copyright (C) 2016-2019 Vincent Ambo <mail@tazj.in> +# +# This file is part of Kontemplate. +# +# Kontemplate is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. + +readonly GIT_HASH="$(git rev-parse --short HEAD)" +readonly LDFLAGS="-X main.gitHash=${GIT_HASH} -w -s" +readonly VERSION="1.8.0-${GIT_HASH}" + +function binary-name() { + local os="${1}" + local target="${2}" + if [ "${os}" = "windows" ]; then + echo -n "${target}/kontemplate.exe" + else + echo -n "${target}/kontemplate" + fi +} + +function build-for() { + local os="${1}" + local arch="${2}" + local target="release/${os}/${arch}" + local bin=$(binary-name "${os}" "${target}") + + echo "Building kontemplate for ${os}-${arch} in ${target}" + + mkdir -p "${target}" + + env GOOS="${os}" GOARCH="${arch}" go build \ + -ldflags "${LDFLAGS}" \ + -o "${bin}" \ + -tags netgo +} + +function sign-for() { + local os="${1}" + local arch="${2}" + local target="release/${os}/${arch}" + local bin=$(binary-name "${os}" "${target}") + local tar="release/kontemplate-${VERSION}-${os}-${arch}.tar.gz" + + echo "Packing release into ${tar}" + tar czvf "${tar}" -C "${target}" $(basename "${bin}") + + local hash=$(sha256sum "${tar}") + echo "Signing kontemplate release tarball for ${os}-${arch} with SHA256 ${hash}" + gpg --armor --detach-sig --sign "${tar}" +} + +case "${1}" in + "build") + # Build releases for various operating systems: + build-for "linux" "amd64" + build-for "darwin" "amd64" + build-for "windows" "amd64" + build-for "freebsd" "amd64" + exit 0 + ;; + "sign") + # Bundle and sign releases: + sign-for "linux" "amd64" + sign-for "darwin" "amd64" + sign-for "windows" "amd64" + sign-for "freebsd" "amd64" + exit 0 + ;; +esac diff --git a/ops/kontemplate/context/context.go b/ops/kontemplate/context/context.go new file mode 100644 index 000000000000..2d0378a0ec23 --- /dev/null +++ b/ops/kontemplate/context/context.go @@ -0,0 +1,266 @@ +// Copyright (C) 2016-2019 Vincent Ambo <mail@tazj.in> +// +// This file is part of Kontemplate. +// +// Kontemplate is free software: you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. + +package context + +import ( + "fmt" + "path" + "strings" + + "github.com/tazjin/kontemplate/util" +) + +type ResourceSet struct { + // Name of the resource set. This can be used in include/exclude statements during kontemplate runs. + Name string `json:"name"` + + // Path to the folder containing the files for this resource set. This defaults to the value of the 'name' field + // if unset. + Path string `json:"path"` + + // Values to include when interpolating resources from this resource set. + Values map[string]interface{} `json:"values"` + + // Args to pass on to kubectl for this resource set. + Args []string `json:"args"` + + // Nested resource sets to include + Include []ResourceSet `json:"include"` + + // Parent resource set for flattened resource sets. Should not be manually specified. + Parent string +} + +type Context struct { + // The name of the kubectl context + Name string `json:"context"` + + // Global variables that should be accessible by all resource sets + Global map[string]interface{} `json:"global"` + + // File names of YAML or JSON files including extra variables that should be globally accessible + VariableImportFiles []string `json:"import"` + + // The resource sets to include in this context + ResourceSets []ResourceSet `json:"include"` + + // Variables imported from additional files + ImportedVars map[string]interface{} + + // Explicitly set variables (via `--var`) that should override all others + ExplicitVars map[string]interface{} + + // This field represents the absolute path to the context base directory and should not be manually specified. + BaseDir string +} + +func contextLoadingError(filename string, cause error) error { + return fmt.Errorf("Context loading failed on file %s due to: \n%v", filename, cause) +} + +// Attempt to load and deserialise a Context from the specified file. +func LoadContext(filename string, explicitVars *[]string) (*Context, error) { + var ctx Context + err := util.LoadData(filename, &ctx) + + if err != nil { + return nil, contextLoadingError(filename, err) + } + + ctx.BaseDir = path.Dir(filename) + + // Prepare the resource sets by resolving parents etc. + ctx.ResourceSets = flattenPrepareResourceSetPaths(&ctx.BaseDir, &ctx.ResourceSets) + + // Add variables explicitly specified on the command line + ctx.ExplicitVars, err = loadExplicitVars(explicitVars) + if err != nil { + return nil, fmt.Errorf("Error setting explicit variables: %v\n", err) + } + + // Add variables loaded from import files + ctx.ImportedVars, err = ctx.loadImportedVariables() + if err != nil { + return nil, contextLoadingError(filename, err) + } + + // Merge variables defined at different levels. The + // `mergeContextValues` function is documented with the merge + // hierarchy. + ctx.ResourceSets = ctx.mergeContextValues() + + if err != nil { + return nil, contextLoadingError(filename, err) + } + + return &ctx, nil +} + +// Kontemplate supports specifying additional variable files with the +// `import` keyword. This function loads those variable files and +// merges them together with the context's other global variables. +func (ctx *Context) loadImportedVariables() (map[string]interface{}, error) { + allImportedVars := make(map[string]interface{}) + + for _, file := range ctx.VariableImportFiles { + // Ensure that the filename is not merged with the baseDir if + // it is set to an absolute path. + var filePath string + if path.IsAbs(file) { + filePath = file + } else { + filePath = path.Join(ctx.BaseDir, file) + } + + var importedVars map[string]interface{} + err := util.LoadData(filePath, &importedVars) + + if err != nil { + return nil, err + } + + allImportedVars = *util.Merge(&allImportedVars, &importedVars) + } + + return allImportedVars, nil +} + +// Correctly prepares the file paths for resource sets by inferring implicit paths and flattening resource set +// collections, i.e. resource sets that themselves have an additional 'include' field set. +// Those will be regarded as a short-hand for including multiple resource sets from a subfolder. +// See https://github.com/tazjin/kontemplate/issues/9 for more information. +func flattenPrepareResourceSetPaths(baseDir *string, rs *[]ResourceSet) []ResourceSet { + flattened := make([]ResourceSet, 0) + + for _, r := range *rs { + // If a path is not explicitly specified it should default to the resource set name. + // This is also the classic behaviour prior to kontemplate 1.2 + if r.Path == "" { + r.Path = r.Name + } + + // Paths are made absolute by resolving them relative to the context base, + // unless absolute paths were specified. + if !path.IsAbs(r.Path) { + r.Path = path.Join(*baseDir, r.Path) + } + + if len(r.Include) == 0 { + flattened = append(flattened, r) + } else { + for _, subResourceSet := range r.Include { + if subResourceSet.Path == "" { + subResourceSet.Path = subResourceSet.Name + } + + subResourceSet.Parent = r.Name + subResourceSet.Name = path.Join(r.Name, subResourceSet.Name) + subResourceSet.Path = path.Join(r.Path, subResourceSet.Path) + subResourceSet.Values = *util.Merge(&r.Values, &subResourceSet.Values) + flattened = append(flattened, subResourceSet) + } + } + } + + return flattened +} + +// Merges the context and resource set variables according in the +// desired precedence order. +// +// For now the reasoning behind the merge order is from least specific +// in relation to the cluster configuration, which means that the +// precedence is (in ascending order): +// +// 1. Default values in resource sets. +// 2. Values imported from files (via `import:`) +// 3. Global values in a cluster configuration +// 4. Values set in a resource set's `include`-section +// 5. Explicit values set on the CLI (`--var`) +// +// For a discussion on the reasoning behind this order, please consult +// https://github.com/tazjin/kontemplate/issues/142 +func (ctx *Context) mergeContextValues() []ResourceSet { + updated := make([]ResourceSet, len(ctx.ResourceSets)) + + // Merging has to happen separately for every individual + // resource set to make use of the default values: + for i, rs := range ctx.ResourceSets { + // Begin by loading default values from the resource + // sets configuration. + // + // Resource sets are used across different cluster + // contexts and the default values in them have the + // lowest precedence. + defaultValues := loadDefaultValues(&rs, ctx) + + // Continue by merging default values with values + // imported from external files. Those values are also + // used across cluster contexts, but have higher + // precedence than defaults. + merged := util.Merge(defaultValues, &ctx.ImportedVars) + + // Merge global values defined in the cluster context: + merged = util.Merge(merged, &ctx.Global) + + // Merge values configured in the resource set's + // `include` section: + merged = util.Merge(merged, &rs.Values) + + // Merge values defined explicitly on the CLI: + merged = util.Merge(merged, &ctx.ExplicitVars) + + // Continue with the newly merged resource set: + rs.Values = *merged + updated[i] = rs + } + + return updated +} + +// Loads default values for a resource set collection from +// path/to/set/default.{json|yaml}. +func loadDefaultValues(rs *ResourceSet, c *Context) *map[string]interface{} { + var defaultVars map[string]interface{} + + for _, filename := range util.DefaultFilenames { + err := util.LoadData(path.Join(rs.Path, filename), &defaultVars) + if err == nil { + return &defaultVars + } + } + + // The actual error is not inspected here. The reasoning for + // this is that in case of serious problems (e.g. permission + // issues with the folder / folder not existing) failure will + // occur a bit later anyways. + // + // Otherwise we'd have to differentiate between + // file-not-found-errors (no default values specified) and + // other errors here. + return &rs.Values +} + +// Prepares the variables specified explicitly via `--var` when +// executing kontemplate for adding to the context. +func loadExplicitVars(vars *[]string) (map[string]interface{}, error) { + explicitVars := make(map[string]interface{}, len(*vars)) + + for _, v := range *vars { + varParts := strings.SplitN(v, "=", 2) + if len(varParts) != 2 { + return nil, fmt.Errorf(`invalid explicit variable provided (%s), name and value should be separated with "="`, v) + } + + explicitVars[varParts[0]] = varParts[1] + } + + return explicitVars, nil +} diff --git a/ops/kontemplate/context/context_test.go b/ops/kontemplate/context/context_test.go new file mode 100644 index 000000000000..7ecd9d587d24 --- /dev/null +++ b/ops/kontemplate/context/context_test.go @@ -0,0 +1,353 @@ +// Copyright (C) 2016-2019 Vincent Ambo <mail@tazj.in> +// +// This file is part of Kontemplate. +// +// Kontemplate is free software: you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. + +package context + +import ( + "reflect" + "testing" +) + +var noExplicitVars []string = make([]string, 0) + +func TestLoadFlatContextFromFile(t *testing.T) { + ctx, err := LoadContext("testdata/flat-test.yaml", &noExplicitVars) + + if err != nil { + t.Error(err) + t.Fail() + } + + expected := Context{ + Name: "k8s.prod.mydomain.com", + Global: map[string]interface{}{ + "globalVar": "lizards", + }, + ResourceSets: []ResourceSet{ + { + Name: "some-api", + Path: "testdata/some-api", + Values: map[string]interface{}{ + "apiPort": float64(4567), // yep! + "importantFeature": true, + "version": "1.0-0e6884d", + "globalVar": "lizards", + }, + Include: nil, + Parent: "", + }, + }, + BaseDir: "testdata", + ImportedVars: make(map[string]interface{}, 0), + ExplicitVars: make(map[string]interface{}, 0), + } + + if !reflect.DeepEqual(*ctx, expected) { + t.Error("Loaded context and expected context did not match") + t.Fail() + } +} + +func TestLoadContextWithArgs(t *testing.T) { + ctx, err := LoadContext("testdata/flat-with-args-test.yaml", &noExplicitVars) + + if err != nil { + t.Error(err) + t.Fail() + } + + expected := Context{ + Name: "k8s.prod.mydomain.com", + ResourceSets: []ResourceSet{ + { + Name: "some-api", + Path: "testdata/some-api", + Values: make(map[string]interface{}, 0), + Args: []string{ + "--as=some-user", + "--as-group=hello:world", + "--as-banana", + "true", + }, + Include: nil, + Parent: "", + }, + }, + BaseDir: "testdata", + ImportedVars: make(map[string]interface{}, 0), + ExplicitVars: make(map[string]interface{}, 0), + } + + if !reflect.DeepEqual(*ctx, expected) { + t.Error("Loaded context and expected context did not match") + t.Fail() + } +} + +func TestLoadContextWithResourceSetCollections(t *testing.T) { + ctx, err := LoadContext("testdata/collections-test.yaml", &noExplicitVars) + + if err != nil { + t.Error(err) + t.Fail() + } + + expected := Context{ + Name: "k8s.prod.mydomain.com", + Global: map[string]interface{}{ + "globalVar": "lizards", + }, + ResourceSets: []ResourceSet{ + { + Name: "some-api", + Path: "testdata/some-api", + Values: map[string]interface{}{ + "apiPort": float64(4567), // yep! + "importantFeature": true, + "version": "1.0-0e6884d", + "globalVar": "lizards", + }, + Include: nil, + Parent: "", + }, + { + Name: "collection/nested", + Path: "testdata/collection/nested", + Values: map[string]interface{}{ + "lizards": "good", + "globalVar": "lizards", + }, + Include: nil, + Parent: "collection", + }, + }, + BaseDir: "testdata", + ImportedVars: make(map[string]interface{}, 0), + ExplicitVars: make(map[string]interface{}, 0), + } + + if !reflect.DeepEqual(*ctx, expected) { + t.Error("Loaded context and expected context did not match") + t.Fail() + } + +} + +func TestSubresourceVariableInheritance(t *testing.T) { + ctx, err := LoadContext("testdata/parent-variables.yaml", &noExplicitVars) + + if err != nil { + t.Error(err) + t.Fail() + } + + expected := Context{ + Name: "k8s.prod.mydomain.com", + ResourceSets: []ResourceSet{ + { + Name: "parent/child", + Path: "testdata/parent/child", + Values: map[string]interface{}{ + "foo": "bar", + "bar": "baz", + }, + Include: nil, + Parent: "parent", + }, + }, + BaseDir: "testdata", + ImportedVars: make(map[string]interface{}, 0), + ExplicitVars: make(map[string]interface{}, 0), + } + + if !reflect.DeepEqual(*ctx, expected) { + t.Error("Loaded and expected context did not match") + t.Fail() + } +} + +func TestSubresourceVariableInheritanceOverride(t *testing.T) { + ctx, err := LoadContext("testdata/parent-variable-override.yaml", &noExplicitVars) + + if err != nil { + t.Error(err) + t.Fail() + } + + expected := Context{ + Name: "k8s.prod.mydomain.com", + ResourceSets: []ResourceSet{ + { + Name: "parent/child", + Path: "testdata/parent/child", + Values: map[string]interface{}{ + "foo": "newvalue", + }, + Include: nil, + Parent: "parent", + }, + }, + BaseDir: "testdata", + ImportedVars: make(map[string]interface{}, 0), + ExplicitVars: make(map[string]interface{}, 0), + } + + if !reflect.DeepEqual(*ctx, expected) { + t.Error("Loaded and expected context did not match") + t.Fail() + } +} + +func TestDefaultValuesLoading(t *testing.T) { + ctx, err := LoadContext("testdata/default-loading.yaml", &noExplicitVars) + if err != nil { + t.Error(err) + t.Fail() + } + + rs := ctx.ResourceSets[0] + if rs.Values["defaultValues"] != "loaded" { + t.Errorf("Default values not loaded from YAML file") + t.Fail() + } + + if rs.Values["override"] != "notAtAll" { + t.Error("Default values should not override other values") + t.Fail() + } +} + +func TestImportValuesLoading(t *testing.T) { + ctx, err := LoadContext("testdata/import-vars-simple.yaml", &noExplicitVars) + if err != nil { + t.Error(err) + t.Fail() + } + + expected := map[string]interface{}{ + "override": "true", + "music": map[string]interface{}{ + "artist": "Pallida", + "track": "Tractor Beam", + }, + } + + if !reflect.DeepEqual(ctx.ImportedVars, expected) { + t.Error("Expected imported values after loading imports did not match!") + t.Fail() + } +} + +func TestExplicitPathLoading(t *testing.T) { + ctx, err := LoadContext("testdata/explicit-path.yaml", &noExplicitVars) + if err != nil { + t.Error(err) + t.Fail() + } + + expected := Context{ + Name: "k8s.prod.mydomain.com", + ResourceSets: []ResourceSet{ + { + Name: "some-api-europe", + Path: "testdata/some-api", + Values: map[string]interface{}{ + "location": "europe", + }, + Include: nil, + Parent: "", + }, + { + Name: "some-api-asia", + Path: "testdata/some-api", + Values: map[string]interface{}{ + "location": "asia", + }, + Include: nil, + Parent: "", + }, + }, + BaseDir: "testdata", + ImportedVars: make(map[string]interface{}, 0), + ExplicitVars: make(map[string]interface{}, 0), + } + + if !reflect.DeepEqual(*ctx, expected) { + t.Error("Loaded context and expected context did not match") + t.Fail() + } +} + +func TestExplicitSubresourcePathLoading(t *testing.T) { + ctx, err := LoadContext("testdata/explicit-subresource-path.yaml", &noExplicitVars) + if err != nil { + t.Error(err) + t.Fail() + } + + expected := Context{ + Name: "k8s.prod.mydomain.com", + ResourceSets: []ResourceSet{ + { + Name: "parent/child", + Path: "testdata/parent-path/child-path", + Parent: "parent", + Values: make(map[string]interface{}, 0), + }, + }, + BaseDir: "testdata", + ImportedVars: make(map[string]interface{}, 0), + ExplicitVars: make(map[string]interface{}, 0), + } + + if !reflect.DeepEqual(*ctx, expected) { + t.Error("Loaded context and expected context did not match") + t.Fail() + } +} + +func TestSetVariablesFromArguments(t *testing.T) { + vars := []string{"version=some-service-version"} + ctx, _ := LoadContext("testdata/default-loading.yaml", &vars) + + if version := ctx.ExplicitVars["version"]; version != "some-service-version" { + t.Errorf(`Expected variable "version" to have value "some-service-version" but was "%s"`, version) + } +} + +func TestSetInvalidVariablesFromArguments(t *testing.T) { + vars := []string{"version: some-service-version"} + _, err := LoadContext("testdata/default-loading.yaml", &vars) + + if err == nil { + t.Error("Expected invalid variable to return an error") + } +} + +// This test ensures that variables are merged in the correct order. +// Please consult the test data in `testdata/merging`. +func TestValueMergePrecedence(t *testing.T) { + cliVars:= []string{"cliVar=cliVar"} + ctx, _ := LoadContext("testdata/merging/context.yaml", &cliVars) + + expected := map[string]interface{}{ + "defaultVar": "defaultVar", + "importVar": "importVar", + "globalVar": "globalVar", + "includeVar": "includeVar", + "cliVar": "cliVar", + } + + result := ctx.ResourceSets[0].Values + + if !reflect.DeepEqual(expected, result) { + t.Errorf("Merged values did not match expected result: \n%v", result) + t.Fail() + } +} diff --git a/ops/kontemplate/context/testdata/collections-test.yaml b/ops/kontemplate/context/testdata/collections-test.yaml new file mode 100644 index 000000000000..a619c8cfddcc --- /dev/null +++ b/ops/kontemplate/context/testdata/collections-test.yaml @@ -0,0 +1,15 @@ +--- +context: k8s.prod.mydomain.com +global: + globalVar: lizards +include: + - name: some-api + values: + version: 1.0-0e6884d + importantFeature: true + apiPort: 4567 + - name: collection + include: + - name: nested + values: + lizards: good diff --git a/ops/kontemplate/context/testdata/default-loading.yaml b/ops/kontemplate/context/testdata/default-loading.yaml new file mode 100644 index 000000000000..d589c99b4eaf --- /dev/null +++ b/ops/kontemplate/context/testdata/default-loading.yaml @@ -0,0 +1,6 @@ +--- +context: default-loading +include: + - name: default + values: + override: notAtAll \ No newline at end of file diff --git a/ops/kontemplate/context/testdata/default/default.yaml b/ops/kontemplate/context/testdata/default/default.yaml new file mode 100644 index 000000000000..0ffa3cd81f24 --- /dev/null +++ b/ops/kontemplate/context/testdata/default/default.yaml @@ -0,0 +1,2 @@ +defaultValues: loaded +override: noop \ No newline at end of file diff --git a/ops/kontemplate/context/testdata/explicit-path.yaml b/ops/kontemplate/context/testdata/explicit-path.yaml new file mode 100644 index 000000000000..2c81f83c0919 --- /dev/null +++ b/ops/kontemplate/context/testdata/explicit-path.yaml @@ -0,0 +1,11 @@ +--- +context: k8s.prod.mydomain.com +include: + - name: some-api-europe + path: some-api + values: + location: europe + - name: some-api-asia + path: some-api + values: + location: asia diff --git a/ops/kontemplate/context/testdata/explicit-subresource-path.yaml b/ops/kontemplate/context/testdata/explicit-subresource-path.yaml new file mode 100644 index 000000000000..6cf86183229e --- /dev/null +++ b/ops/kontemplate/context/testdata/explicit-subresource-path.yaml @@ -0,0 +1,8 @@ +--- +context: k8s.prod.mydomain.com +include: + - name: parent + path: parent-path + include: + - name: child + path: child-path diff --git a/ops/kontemplate/context/testdata/flat-test.yaml b/ops/kontemplate/context/testdata/flat-test.yaml new file mode 100644 index 000000000000..dd7804f719c3 --- /dev/null +++ b/ops/kontemplate/context/testdata/flat-test.yaml @@ -0,0 +1,10 @@ +--- +context: k8s.prod.mydomain.com +global: + globalVar: lizards +include: + - name: some-api + values: + version: 1.0-0e6884d + importantFeature: true + apiPort: 4567 diff --git a/ops/kontemplate/context/testdata/flat-with-args-test.yaml b/ops/kontemplate/context/testdata/flat-with-args-test.yaml new file mode 100644 index 000000000000..29d3334fb54d --- /dev/null +++ b/ops/kontemplate/context/testdata/flat-with-args-test.yaml @@ -0,0 +1,9 @@ +--- +context: k8s.prod.mydomain.com +include: + - name: some-api + args: + - --as=some-user + - --as-group=hello:world + - --as-banana + - "true" diff --git a/ops/kontemplate/context/testdata/import-vars-simple.yaml b/ops/kontemplate/context/testdata/import-vars-simple.yaml new file mode 100644 index 000000000000..12244e1ab174 --- /dev/null +++ b/ops/kontemplate/context/testdata/import-vars-simple.yaml @@ -0,0 +1,5 @@ +--- +context: k8s.prod.mydomain.com +import: + - test-vars.yaml +include: [] diff --git a/ops/kontemplate/context/testdata/merging/context.yaml b/ops/kontemplate/context/testdata/merging/context.yaml new file mode 100644 index 000000000000..df30d3d8cbe3 --- /dev/null +++ b/ops/kontemplate/context/testdata/merging/context.yaml @@ -0,0 +1,15 @@ +# This context file is intended to test the merge hierarchy of +# variables defined at different levels. +--- +context: merging.in.kontemplate.works +global: + globalVar: globalVar + includeVar: should be overridden (global) + cliVar: should be overridden (global) +import: + - import-vars.yaml +include: + - name: resource + values: + includeVar: includeVar + cliVar: should be overridden (include) diff --git a/ops/kontemplate/context/testdata/merging/import-vars.yaml b/ops/kontemplate/context/testdata/merging/import-vars.yaml new file mode 100644 index 000000000000..2a51352571a6 --- /dev/null +++ b/ops/kontemplate/context/testdata/merging/import-vars.yaml @@ -0,0 +1,4 @@ +importVar: importVar +globalVar: should be overridden (import) +includeVar: should be overridden (import) +cliVar: should be overridden (import) diff --git a/ops/kontemplate/context/testdata/merging/resource/default.yaml b/ops/kontemplate/context/testdata/merging/resource/default.yaml new file mode 100644 index 000000000000..040a19aaba25 --- /dev/null +++ b/ops/kontemplate/context/testdata/merging/resource/default.yaml @@ -0,0 +1,5 @@ +defaultVar: defaultVar +importVar: should be overridden (default) +globalVar: should be overridden (default) +includeVar: should be overridden (default) +cliVar: should be overridden (default) diff --git a/ops/kontemplate/context/testdata/merging/resource/output.yaml b/ops/kontemplate/context/testdata/merging/resource/output.yaml new file mode 100644 index 000000000000..5920b2720780 --- /dev/null +++ b/ops/kontemplate/context/testdata/merging/resource/output.yaml @@ -0,0 +1,5 @@ +defaultVar: {{ .defaultVar }} +importVar: {{ .importVar }} +globalVar: {{ .globalVar }} +includeVar: {{ .includeVar }} +cliVar: {{ .cliVar }} diff --git a/ops/kontemplate/context/testdata/parent-variable-override.yaml b/ops/kontemplate/context/testdata/parent-variable-override.yaml new file mode 100644 index 000000000000..42676c3028fe --- /dev/null +++ b/ops/kontemplate/context/testdata/parent-variable-override.yaml @@ -0,0 +1,10 @@ +--- +context: k8s.prod.mydomain.com +include: + - name: parent + values: + foo: bar + include: + - name: child + values: + foo: newvalue diff --git a/ops/kontemplate/context/testdata/parent-variables.yaml b/ops/kontemplate/context/testdata/parent-variables.yaml new file mode 100644 index 000000000000..8459fd30405b --- /dev/null +++ b/ops/kontemplate/context/testdata/parent-variables.yaml @@ -0,0 +1,10 @@ +--- +context: k8s.prod.mydomain.com +include: + - name: parent + values: + foo: bar + include: + - name: child + values: + bar: baz diff --git a/ops/kontemplate/context/testdata/test-vars-override.yaml b/ops/kontemplate/context/testdata/test-vars-override.yaml new file mode 100644 index 000000000000..5215c559c136 --- /dev/null +++ b/ops/kontemplate/context/testdata/test-vars-override.yaml @@ -0,0 +1,3 @@ +--- +override: 3 +place: Oslo diff --git a/ops/kontemplate/context/testdata/test-vars.yaml b/ops/kontemplate/context/testdata/test-vars.yaml new file mode 100644 index 000000000000..af27bdc455bf --- /dev/null +++ b/ops/kontemplate/context/testdata/test-vars.yaml @@ -0,0 +1,5 @@ +--- +override: 'true' +music: + artist: Pallida + track: Tractor Beam diff --git a/ops/kontemplate/default.nix b/ops/kontemplate/default.nix new file mode 100644 index 000000000000..afec560fbafd --- /dev/null +++ b/ops/kontemplate/default.nix @@ -0,0 +1,36 @@ +# Copyright (C) 2016-2019 Vincent Ambo <mail@tazj.in> +# +# This file is part of Kontemplate. +# +# Kontemplate is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. +# +# This file is the Nix derivation used to install Kontemplate on +# Nix-based systems. + +{ pkgs ? import <nixpkgs> {} }: + +with pkgs; buildGoPackage rec { + name = "kontemplate-${version}"; + version = "master"; + src = ./.; + goPackagePath = "github.com/tazjin/kontemplate"; + goDeps = ./deps.nix; + buildInputs = [ parallel ]; + + # Enable checks and configure check-phase to include vet: + doCheck = true; + preCheck = '' + for pkg in $(getGoDirs ""); do + buildGoDir vet "$pkg" + done + ''; + + meta = with lib; { + description = "A resource templating helper for Kubernetes"; + homepage = "http://kontemplate.works/"; + license = licenses.gpl3; + }; +} diff --git a/ops/kontemplate/deps.nix b/ops/kontemplate/deps.nix new file mode 100644 index 000000000000..7693968bd550 --- /dev/null +++ b/ops/kontemplate/deps.nix @@ -0,0 +1,111 @@ +# This file was generated by https://github.com/kamilchm/go2nix v1.3.0 +[ + { + goPackagePath = "github.com/Masterminds/goutils"; + fetch = { + type = "git"; + url = "https://github.com/Masterminds/goutils"; + rev = "41ac8693c5c10a92ea1ff5ac3a7f95646f6123b0"; + sha256 = "180px47gj936qyk5bkv5mbbgiil9abdjq6kwkf7sq70vyi9mcfiq"; + }; + } + { + goPackagePath = "github.com/Masterminds/semver"; + fetch = { + type = "git"; + url = "https://github.com/Masterminds/semver"; + rev = "5bc3b9184d48f1412b300b87a200cf020d9254cf"; + sha256 = "1vdfm653v50jf63cw0kg2hslx50cn4mk6lj3p51bi11jrg48kfng"; + }; + } + { + goPackagePath = "github.com/Masterminds/sprig"; + fetch = { + type = "git"; + url = "https://github.com/Masterminds/sprig"; + rev = "6f509977777c33eae63b2136d97f7b976cb971cc"; + sha256 = "05h9k6fhjxnpwlihj3z02q9kvqvnq53jix0ab84sx0666bci3cdh"; + }; + } + { + goPackagePath = "github.com/alecthomas/template"; + fetch = { + type = "git"; + url = "https://github.com/alecthomas/template"; + rev = "fb15b899a75114aa79cc930e33c46b577cc664b1"; + sha256 = "1vlasv4dgycydh5wx6jdcvz40zdv90zz1h7836z7lhsi2ymvii26"; + }; + } + { + goPackagePath = "github.com/alecthomas/units"; + fetch = { + type = "git"; + url = "https://github.com/alecthomas/units"; + rev = "c3de453c63f4bdb4dadffab9805ec00426c505f7"; + sha256 = "0js37zlgv37y61j4a2d46jh72xm5kxmpaiw0ya9v944bjpc386my"; + }; + } + { + goPackagePath = "github.com/ghodss/yaml"; + fetch = { + type = "git"; + url = "https://github.com/ghodss/yaml"; + rev = "25d852aebe32c875e9c044af3eef9c7dc6bc777f"; + sha256 = "1w9yq0bxzygc4qwkwwiy7k1k1yviaspcqqv18255k2xkjv5ipccz"; + }; + } + { + goPackagePath = "github.com/google/uuid"; + fetch = { + type = "git"; + url = "https://github.com/google/uuid"; + rev = "c2e93f3ae59f2904160ceaab466009f965df46d6"; + sha256 = "0zw8fvl6jqg0fmv6kmvhss0g4gkrbvgyvl2zgy5wdbdlgp4fja0h"; + }; + } + { + goPackagePath = "github.com/huandu/xstrings"; + fetch = { + type = "git"; + url = "https://github.com/huandu/xstrings"; + rev = "8bbcf2f9ccb55755e748b7644164cd4bdce94c1d"; + sha256 = "1ivvc95514z63k7cpz71l0dwlanffmsh1pijhaqmp41kfiby8rsx"; + }; + } + { + goPackagePath = "github.com/imdario/mergo"; + fetch = { + type = "git"; + url = "https://github.com/imdario/mergo"; + rev = "4c317f2286be3bd0c4f1a0e622edc6398ec4656d"; + sha256 = "0bihha1qsgfjk14yv1hwddv3d8dzxpbjlaxwwyys6lhgxz1cr9h9"; + }; + } + { + goPackagePath = "golang.org/x/crypto"; + fetch = { + type = "git"; + url = "https://go.googlesource.com/crypto"; + rev = "9756ffdc24725223350eb3266ffb92590d28f278"; + sha256 = "0q7hxaaq6lp0v8qqzifvysl47z5rfdlrxkh3d29vsl3wyby3dxl8"; + }; + } + { + goPackagePath = "gopkg.in/alecthomas/kingpin.v2"; + fetch = { + type = "git"; + url = "https://gopkg.in/alecthomas/kingpin.v2"; + rev = "947dcec5ba9c011838740e680966fd7087a71d0d"; + sha256 = "0mndnv3hdngr3bxp7yxfd47cas4prv98sqw534mx7vp38gd88n5r"; + }; + } + { + goPackagePath = "gopkg.in/yaml.v2"; + fetch = { + type = "git"; + url = "https://gopkg.in/yaml.v2"; + rev = "51d6538a90f86fe93ac480b35f37b2be17fef232"; + sha256 = "01wj12jzsdqlnidpyjssmj0r4yavlqy7dwrg7adqd8dicjc4ncsa"; + }; + } +] diff --git a/ops/kontemplate/docs/cluster-config.md b/ops/kontemplate/docs/cluster-config.md new file mode 100644 index 000000000000..fee1f576347c --- /dev/null +++ b/ops/kontemplate/docs/cluster-config.md @@ -0,0 +1,106 @@ +Cluster configuration +========================== + +Every cluster (or "environment") that requires individual configuration is specified in +a very simple YAML file in Kontemplate. + +An example file for a hypothetical test environment could look like this: + +```yaml +--- +context: k8s.test.mydomain.com +global: + clusterName: test-cluster + defaultReplicas: 2 +import: + - test-secrets.yaml +include: + - name: gateway + path: tools/nginx + values: + tlsDomains: + - test.oslo.pub + - test.tazj.in + - path: backend + values: + env: test + include: + - name: blog + values: + url: test.tazj.in + - name: pub-service +``` + +<!-- markdown-toc start - Don't edit this section. Run M-x markdown-toc-refresh-toc --> +**Table of Contents** + +- [Cluster configuration](#cluster-configuration) + - [Fields](#fields) + - [`context`](#context) + - [`global`](#global) + - [`import`](#import) + - [`include`](#include) + - [External variables](#external-variables) + +<!-- markdown-toc end --> + +## Fields + +This is documentation for the individual fields in a cluster context file. + +### `context` + +The `context` field contains the name of the kubectl-context. You can list context names with +'kubectl config get-contexts'. + +This must be set here so that Kontemplate can use the correct context when calling kubectl. + +This field is **required** for `kubectl`-wrapping commands. It can be left out if only the `template`-command is used. + +### `global` + +The `global` field contains a key/value map of variables that should be available to all resource +sets in the cluster. + +This field is **optional**. + +### `import` + +The `import` field contains the file names of additional YAML or JSON files from which global +variables should be loaded. Using this field makes it possible to keep certain configuration that +is the same for some, but not all, clusters in a common place. + +This field is **optional**. + +### `include` + +The `include` field contains the actual resource sets to be included in the cluster. + +Information about the structure of resource sets can be found in the [resource set documentation][]. + +This field is **required**. + +## External variables + +As mentioned above, extra variables can be loaded from additional YAML or JSON files. Assuming you +have a file called `test-secrets.yaml` which contains variables that should be shared between a `test` +and `dev` cluster, you could include it in your context as such: + +```yaml +# test-secrets.yaml: +mySecretVar: foo-bar-12345 + +# test-cluster.yaml: +context: k8s.test.mydomain.com +include: + - test-secrets.yaml + +# dev-cluster.yaml: +context: k8s.dev.mydomain.com +include: + - test-secrets.yaml +``` + +The variable `mySecretVar` is then available as a global variable. + +[resource set documentation]: resource-sets.md diff --git a/ops/kontemplate/docs/resource-sets.md b/ops/kontemplate/docs/resource-sets.md new file mode 100644 index 000000000000..1444dd491249 --- /dev/null +++ b/ops/kontemplate/docs/resource-sets.md @@ -0,0 +1,170 @@ +Resource Sets +================ + +Resource sets are collections of Kubernetes resources that should be passed to `kubectl` together. + +Technically a resource set is simply a folder with a few YAML and/or JSON templates in it. + +<!-- markdown-toc start - Don't edit this section. Run M-x markdown-toc-refresh-toc --> +**Table of Contents** + +- [Resource Sets](#resource-sets) +- [Creating resource sets](#creating-resource-sets) + - [Default variables](#default-variables) +- [Including resource sets](#including-resource-sets) + - [Fields](#fields) + - [`name`](#name) + - [`path`](#path) + - [`values`](#values) + - [`args`](#args) + - [`include`](#include) + - [Multiple includes](#multiple-includes) + - [Nesting resource sets](#nesting-resource-sets) + - [Caveats](#caveats) + +<!-- markdown-toc end --> + +# Creating resource sets + +Simply create a folder in your Kontemplate repository and place a YAML or JSON file in it. These +files get interpreted as [templates][] during Kontemplate runs and variables (as well as template +logic or functions) will be interpolated. + +Refer to the template documentation for information on how to write templates. + +## Default variables + +Sometimes it is useful to specify default values for variables that should be interpolated during +a run if the [cluster configuration][] does not specify a variable explicitly. + +This can be done simply by placing a `default.yaml` or `default.json` file in the resource set +folder and filling it with key/value pairs of the intended default variables. + +Kontemplate will error during interpolation if any variables are left unspecified. + +# Including resource sets + +Under the cluster configuration `include` key resource sets are included and required variables +are specified. For example: + +```yaml +include: + - name: some-api + values: + version: 1.2-SNAPSHOT +``` + +This will include a resource set from a folder called `some-api` and set the specified `version` variable. + +## Fields + +The available fields when including a resource set are these: + +### `name` + +The `name` field contains the name of the resource set. This name can be used to refer to the resource set +when specifying explicit includes or excludes during a run. + +By default it is assumed that the `name` is the path to the resource set folder, but this can be overridden. + +This field is **required**. + +### `path` + +The `path` field specifies an explicit path to a resource set folder in the case that it should differ from +the resource set's `name`. + +This field is **optional**. + +### `values` + +The `values` field specifies key/values pairs of variables that should be available during templating. + +This field is **optional**. + +### `args` + +The `args` field specifies a list of arguments that should be passed to `kubectl`. + +This field is **optional**. + +### `include` + +The `include` field specifies additional resource sets that should be included and that should inherit the +variables of this resource set. + +The fully qualified names of "nested" resource sets are set to `${PARENT_NAME}/${CHILD_NAME}` and paths are +merged in the same way. + +This makes it easy to organise different resource sets as "groups" to include / exclude them collectively +during runs. + +This field is **optional**. + +## Multiple includes + +Resource sets can be included multiple times with different configurations. In this case it is recommended +to set the `path` and `name` fields explicitly. For example: + +```yaml +include: + - name: forwarder-europe + path: tools/forwarder + values: + source: europe + - name: forwarder-asia + path: tools/forwarder + values: + source: asia +``` + +The two different configurations can be referred to by their set names, but will use the same resource +templates with different configurations. + +## Nesting resource sets + +As mentioned above for the `include` field, resource sets can be nested. This lets users group resource +sets in logical ways using simple folder structures. + +Assuming a folder structure like: + +``` +├── backend +│ ├── auth-api +│ ├── message-api +│ └── order-api +└── frontend + ├── app-page + └── login-page +``` + +With each of these folders being a resource set, they could be included in a cluster configuration like so: + +```yaml +include: + - name: backend + include: + - name: auth-api + - name: message-api + - name: order-api + - name: frontend: + include: + - name: app-page + - name: login-page +``` + +Kontemplate could then be run with, for example, `--include backend` to only include the resource sets nested +in the backend group. Specific resource sets can also be targeted, for example as `--include backend/order-api`. + +Variables specified in the parent resource set are inherited by the children. + +### Caveats + +Two caveats apply that users should be aware of: + +1. The parent resource set can not contain any resource templates itself. + +2. Only one level of nesting is supported. Specifying `include` again on a nested resource set will be ignored. + +[templates]: templates.md +[cluster configuration]: cluster-config.md diff --git a/ops/kontemplate/docs/templates.md b/ops/kontemplate/docs/templates.md new file mode 100644 index 000000000000..32da205108de --- /dev/null +++ b/ops/kontemplate/docs/templates.md @@ -0,0 +1,153 @@ +Kontemplate templates +===================== + +The template file format is based on Go's [templating engine][] in combination +with a small extension library called [sprig][] that adds additional template +functions. + +Go templates can either simply display variables or build more complicated +*pipelines* in which variables are passed to functions for further processing, +or in which conditionals are evaluated for more complex template logic. + +It is recommended that you check out the Golang [documentation][] for the templating +engine in addition to the cherry-picked features listed here. + +<!-- markdown-toc start - Don't edit this section. Run M-x markdown-toc-refresh-toc --> +**Table of Contents** + +- [Kontemplate templates](#kontemplate-templates) + - [Basic variable interpolation](#basic-variable-interpolation) + - [Example:](#example) + - [Template functions](#template-functions) + - [Examples:](#examples) + - [Conditionals & ranges](#conditionals--ranges) + - [Caveats](#caveats) + +<!-- markdown-toc end --> + +## Basic variable interpolation + +The basic template format uses `{{ .variableName }}` as the interpolation format. + +### Example: + +Assuming that you include a resource set as such: + +``` +- name: api-gateway + values: + internalHost: http://my-internal-host/ +``` + +And the api-gateway resource set includes a ConfigMap (some fields left out for +the example): + +``` +# api-gateway/configmap.yaml: +--- +kind: ConfigMap +metadata: + name: api-gateway-config +data: + internalHost: {{ .internalHost }} +``` + +The resulting output will be: + +``` + +--- +kind: ConfigMap +metadata: + name: api-gateway-config +data: + internalHost: http://my-internal-host/ +``` + +## Template functions + +Go templates support template functions which you can think of as a sort of +shell-like pipeline where text flows through transformations from left to +right. + +Some template functions come from Go's standard library and are listed in the +[Go documentation][]. In addition the functions declared by [sprig][] are +available in kontemplate, as well as five custom functions: + +* `json`: Encodes any supplied data structure as JSON. +* `gitHEAD`: Retrieves the commit hash at Git `HEAD`. +* `passLookup`: Looks up the supplied key in [pass][]. +* `insertFile`: Insert the contents of the given file in the resource + set folder as a string. +* `insertTemplate`: Insert the contents of the given template in the resource + set folder as a string. + +## Examples: + +``` +# With the following values: +name: Donald +certKeyPath: my-website/cert-key + +# The following interpolations are possible: + +{{ .name | upper }} +-> DONALD + +{{ .name | upper | repeat 2 }} +-> DONALD DONALD + +{{ .certKeyPath | passLookup }} +-> Returns content of 'my-website/cert-key' from pass + +{{ gitHEAD }} +-> Returns the Git commit hash at HEAD. +``` + +## Conditionals & ranges + +Some logic is supported in Golang templates and can be used in Kontemplate, too. + +With the following values: + +``` +useKube2IAM: true +servicePorts: + - 8080 + - 9090 +``` + +The following interpolations are possible: + +``` +# Conditionally insert something in the template: +metadata: + annotations: + foo: bar + {{ if .useKube2IAM -}} iam.amazonaws.com/role: my-api {{- end }} +``` + +``` +# Iterate over a list of values +ports: + {{ range .servicePorts }} + - port: {{ . }} + {{ end }} +``` + +Check out the Golang documentation (linked above) for more information about template logic. + +## Caveats + +Kontemplate does not by itself parse any of the content of the templates, which +means that it does not validate whether the resources you supply are valid YAML +or JSON. + +You can perform some validation by using `kontemplate apply --dry-run` which +will make use of the Dry-Run functionality in `kubectl`. + +[templating engine]: https://golang.org/pkg/text/template/ +[documentation]: https://golang.org/pkg/text/template/ +[sprig]: http://masterminds.github.io/sprig/ +[Go documentation]: https://golang.org/pkg/text/template/#hdr-Functions +[pass]: https://www.passwordstore.org/ diff --git a/ops/kontemplate/docs/tips-and-tricks.md b/ops/kontemplate/docs/tips-and-tricks.md new file mode 100644 index 000000000000..5401ac91e5a3 --- /dev/null +++ b/ops/kontemplate/docs/tips-and-tricks.md @@ -0,0 +1,77 @@ +Kontemplate tips & tricks +========================= + +<!-- markdown-toc start - Don't edit this section. Run M-x markdown-toc-refresh-toc --> +**Table of Contents** + +- [Kontemplate tips & tricks](#kontemplate-tips--tricks) + - [Update Deployments when ConfigMaps change](#update-deployments-when-configmaps-change) + - [direnv & pass](#direnv--pass) + +<!-- markdown-toc end --> + +## Update Deployments when ConfigMaps change + +Kubernetes does [not currently][] have the ability to perform rolling updates +of Deployments and other resource types when `ConfigMap` or `Secret` objects +are updated. + +It is possible to make use of annotations and templating functions in +Kontemplate to force updates to these resources anyways. + +For example: + +```yaml +# A ConfigMap that contains some configuration for your app +--- +kind: ConfigMap +metadata: + name: app-config +data: + app.conf: | + name: {{ .appName }} + foo: bar +``` + +Now whenever the `appName` variable changes or we make an edit to the +`ConfigMap` we would like to update the `Deployment` making use of it, too. We +can do this by adding a hash of the parsed template to the annotations of the +created `Pod` objects: + +```yaml + +--- +kind: Deployment +metadata: + name: app +spec: + template: + metadata: + annotations: + configHash: {{ insertTemplate "app-config.yaml" | sha256sum }} + spec: + containers: + - name: app + # Some details omitted ... + volumeMounts: + - name: config + mountPath: /etc/app/ + volumes: + - name: config + configMap: + name: app-config +``` + +Now any change to the `ConfigMap` - either by directly editing the yaml file or +via a changed template variable - will cause the annotation to change, +triggering a rolling update of all relevant pods. + +## direnv & pass + +Users of `pass` may have multiple different password stores on their machines. +Assuming that `kontemplate` configuration exists somewhere on the filesystem +per project, it is easy to use [direnv][] to switch to the correct +`PASSWORD_STORE_DIR` variable when entering the folder. + +[not currently]: https://github.com/kubernetes/kubernetes/issues/22368 +[direnv]: https://direnv.net/ diff --git a/ops/kontemplate/example/other-config.yaml b/ops/kontemplate/example/other-config.yaml new file mode 100644 index 000000000000..87370569c46e --- /dev/null +++ b/ops/kontemplate/example/other-config.yaml @@ -0,0 +1,7 @@ +--- +apiVersion: extensions/v1beta1 +kind: ConfigMap +metadata: + name: other-config +data: + globalData: {{ .globalVar }} diff --git a/ops/kontemplate/example/prod-cluster.json b/ops/kontemplate/example/prod-cluster.json new file mode 100644 index 000000000000..70e2365f1710 --- /dev/null +++ b/ops/kontemplate/example/prod-cluster.json @@ -0,0 +1,16 @@ +{ + "context": "k8s.prod.mydomain.com", + "global": { + "globalVar": "lizards" + }, + "include": [ + { + "name": "some-api", + "values": { + "version": "1.0-SNAPSHOT-0e6884d", + "importantFeature": true, + "apiPort": 4567 + } + } + ] +} diff --git a/ops/kontemplate/example/prod-cluster.yaml b/ops/kontemplate/example/prod-cluster.yaml new file mode 100644 index 000000000000..9f300a492080 --- /dev/null +++ b/ops/kontemplate/example/prod-cluster.yaml @@ -0,0 +1,17 @@ +--- +context: k8s.prod.mydomain.com +global: + globalVar: lizards +include: + # By default resource sets are included from a folder with the same + # name as the resource set's name + - name: some-api + values: + version: 1.0-0e6884d + importantFeature: true + apiPort: 4567 + + # Paths can also be specified manually (and point at single template + # files!) + - name: other-config + path: other-config.yaml diff --git a/ops/kontemplate/example/some-api/some-api.yaml b/ops/kontemplate/example/some-api/some-api.yaml new file mode 100644 index 000000000000..f0188f9dbde3 --- /dev/null +++ b/ops/kontemplate/example/some-api/some-api.yaml @@ -0,0 +1,52 @@ +--- +apiVersion: v1 +kind: Secret +metadata: + name: secret-certificate +data: + cert.pem: {{ passLookup "my/secret/certificate" | b64enc }} +--- +apiVersion: extensions/v1beta1 +kind: ConfigMap +metadata: + name: some-config +data: + # The content of the example configuration file is templated in here + # by the 'insertFile' function and indented for YAML-compatibility + # with the 'indent' function: + some.cfg: | +{{ insertFile "some.cfg" | indent 4 }} +--- +apiVersion: extensions/v1beta1 +kind: Deployment +metadata: + name: some-api +spec: + replicas: 1 + template: + metadata: + labels: + app: some-api + spec: + containers: + - image: my.container.repo/some-api:{{ .version }} + name: some-api + env: + - name: ENABLE_IMPORTANT_FEATURE + value: {{ .importantFeature }} + - name: SOME_GLOBAL_VAR + value: {{ .globalVar }} +--- +apiVersion: v1 +kind: Service +metadata: + name: some-api + labels: + app: some-api +spec: + selector: + app: some-api + ports: + - port: 80 + targetPort: {{ .apiPort }} + name: http diff --git a/ops/kontemplate/example/some-api/some.cfg b/ops/kontemplate/example/some-api/some.cfg new file mode 100644 index 000000000000..733d5e16789a --- /dev/null +++ b/ops/kontemplate/example/some-api/some.cfg @@ -0,0 +1,4 @@ +{ + "something": 1542, + "other-thing": "да" +} diff --git a/ops/kontemplate/image/Dockerfile b/ops/kontemplate/image/Dockerfile new file mode 100644 index 000000000000..a40fa83b0867 --- /dev/null +++ b/ops/kontemplate/image/Dockerfile @@ -0,0 +1,15 @@ +FROM alpine:3.10 + +ADD hashes /root/hashes +ADD https://storage.googleapis.com/kubernetes-release/release/v1.15.3/bin/linux/amd64/kubectl /usr/bin/kubectl +ADD https://github.com/tazjin/kontemplate/releases/download/v1.8.0/kontemplate-1.8.0-6c3b299-linux-amd64.tar.gz /tmp/kontemplate.tar.gz + +# Pass release version is 1.7.3 +ADD https://raw.githubusercontent.com/zx2c4/password-store/74fdfb5022f317ad48d449e29543710bdad1afda/src/password-store.sh /usr/bin/pass + +RUN sha256sum -c /root/hashes && \ + apk add -U bash tree gnupg git && \ + chmod +x /usr/bin/kubectl /usr/bin/pass && \ + tar xzvf /tmp/kontemplate.tar.gz && \ + mv kontemplate /usr/bin/kontemplate && \ + /usr/bin/kontemplate version diff --git a/ops/kontemplate/image/README.md b/ops/kontemplate/image/README.md new file mode 100644 index 000000000000..fe04765401be --- /dev/null +++ b/ops/kontemplate/image/README.md @@ -0,0 +1,12 @@ +Kontemplate Docker image +======================== + +This builds a simple Docker image available on the Docker Hub as `tazjin/kontemplate`. + +Builds are automated based on the Dockerfile contained here. + +It contains both `kontemplate` and `kubectl` and can be used as part of container-based +CI pipelines. + +`pass` and its dependencies are also installed to enable the use of the `passLookup` +template function if desired. diff --git a/ops/kontemplate/image/hashes b/ops/kontemplate/image/hashes new file mode 100644 index 000000000000..bfd87c0201e7 --- /dev/null +++ b/ops/kontemplate/image/hashes @@ -0,0 +1,2 @@ +a39dfdd77e4655acaabe301285cf389cb5fc8145060f5677dc93db1cc20911a4 /tmp/kontemplate.tar.gz +6e805054a1fb2280abb53f75b57a1b92bf9c66ffe0d2cdcd46e81b079d93c322 /usr/bin/kubectl diff --git a/ops/kontemplate/main.go b/ops/kontemplate/main.go new file mode 100644 index 000000000000..e55d42465c6b --- /dev/null +++ b/ops/kontemplate/main.go @@ -0,0 +1,242 @@ +// Copyright (C) 2016-2019 Vincent Ambo <mail@tazj.in> +// +// Kontemplate is free software: you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. + +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. + +// You should have received a copy of the GNU General Public License +// along with this program. If not, see <http://www.gnu.org/licenses/>. + +package main + +import ( + "fmt" + "os" + "os/exec" + "strings" + + "github.com/tazjin/kontemplate/context" + "github.com/tazjin/kontemplate/templater" + "gopkg.in/alecthomas/kingpin.v2" +) + +const version string = "1.8.0" + +// This variable will be initialised by the Go linker during the builder +var gitHash string + +var ( + app = kingpin.New("kontemplate", "simple Kubernetes resource templating") + + // Global flags + includes = app.Flag("include", "Resource sets to include explicitly").Short('i').Strings() + excludes = app.Flag("exclude", "Resource sets to exclude explicitly").Short('e').Strings() + variables = app.Flag("var", "Provide variables to templates explicitly").Strings() + kubectlBin = app.Flag("kubectl", "Path to the kubectl binary (default 'kubectl')").Default("kubectl").String() + + // Commands + template = app.Command("template", "Template resource sets and print them") + templateFile = template.Arg("file", "Cluster configuration file to use").Required().String() + templateOutputDir = template.Flag("output", "Output directory in which to save templated files instead of printing them").Short('o').String() + + apply = app.Command("apply", "Template resources and pass to 'kubectl apply'") + applyFile = apply.Arg("file", "Cluster configuration file to use").Required().String() + applyDryRun = apply.Flag("dry-run", "Print remote operations without executing them").Default("false").Bool() + + replace = app.Command("replace", "Template resources and pass to 'kubectl replace'") + replaceFile = replace.Arg("file", "Cluster configuration file to use").Required().String() + + delete = app.Command("delete", "Template resources and pass to 'kubectl delete'") + deleteFile = delete.Arg("file", "Cluster configuration file to use").Required().String() + + create = app.Command("create", "Template resources and pass to 'kubectl create'") + createFile = create.Arg("file", "Cluster configuration file to use").Required().String() + + versionCmd = app.Command("version", "Show kontemplate version") +) + +func main() { + app.HelpFlag.Short('h') + + switch kingpin.MustParse(app.Parse(os.Args[1:])) { + case template.FullCommand(): + templateCommand() + + case apply.FullCommand(): + applyCommand() + + case replace.FullCommand(): + replaceCommand() + + case delete.FullCommand(): + deleteCommand() + + case create.FullCommand(): + createCommand() + + case versionCmd.FullCommand(): + versionCommand() + } +} + +func versionCommand() { + if gitHash == "" { + fmt.Printf("Kontemplate version %s (git commit unknown)\n", version) + } else { + fmt.Printf("Kontemplate version %s (git commit: %s)\n", version, gitHash) + } +} + +func templateCommand() { + _, resourceSets := loadContextAndResources(templateFile) + + for _, rs := range *resourceSets { + if len(rs.Resources) == 0 { + fmt.Fprintf(os.Stderr, "Warning: Resource set '%s' does not exist or contains no valid templates\n", rs.Name) + continue + } + + if *templateOutputDir != "" { + templateIntoDirectory(templateOutputDir, rs) + } else { + for _, r := range rs.Resources { + fmt.Fprintf(os.Stderr, "Rendered file %s/%s:\n", rs.Name, r.Filename) + fmt.Println(r.Rendered) + } + } + } +} + +func templateIntoDirectory(outputDir *string, rs templater.RenderedResourceSet) { + // Attempt to create the output directory if it does not + // already exist: + if err := os.MkdirAll(*templateOutputDir, 0775); err != nil { + app.Fatalf("Could not create output directory: %v\n", err) + } + + // Nested resource sets may contain slashes in their names. + // These are replaced with dashes for the purpose of writing a + // flat list of output files: + setName := strings.Replace(rs.Name, "/", "-", -1) + + for _, r := range rs.Resources { + filename := fmt.Sprintf("%s/%s-%s", *templateOutputDir, setName, r.Filename) + fmt.Fprintf(os.Stderr, "Writing file %s\n", filename) + + file, err := os.Create(filename) + if err != nil { + app.Fatalf("Could not create file %s: %v\n", filename, err) + } + + _, err = fmt.Fprintf(file, r.Rendered) + if err != nil { + app.Fatalf("Error writing file %s: %v\n", filename, err) + } + } +} + +func applyCommand() { + ctx, resources := loadContextAndResources(applyFile) + + var kubectlArgs []string + + if *applyDryRun { + kubectlArgs = []string{"apply", "-f", "-", "--dry-run"} + } else { + kubectlArgs = []string{"apply", "-f", "-"} + } + + if err := runKubectlWithResources(ctx, &kubectlArgs, resources); err != nil { + failWithKubectlError(err) + } +} + +func replaceCommand() { + ctx, resources := loadContextAndResources(replaceFile) + args := []string{"replace", "--save-config=true", "-f", "-"} + + if err := runKubectlWithResources(ctx, &args, resources); err != nil { + failWithKubectlError(err) + } +} + +func deleteCommand() { + ctx, resources := loadContextAndResources(deleteFile) + args := []string{"delete", "-f", "-"} + + if err := runKubectlWithResources(ctx, &args, resources); err != nil { + failWithKubectlError(err) + } +} + +func createCommand() { + ctx, resources := loadContextAndResources(createFile) + args := []string{"create", "--save-config=true", "-f", "-"} + + if err := runKubectlWithResources(ctx, &args, resources); err != nil { + failWithKubectlError(err) + } +} + +func loadContextAndResources(file *string) (*context.Context, *[]templater.RenderedResourceSet) { + ctx, err := context.LoadContext(*file, variables) + if err != nil { + app.Fatalf("Error loading context: %v\n", err) + } + + resources, err := templater.LoadAndApplyTemplates(includes, excludes, ctx) + if err != nil { + app.Fatalf("Error templating resource sets: %v\n", err) + } + + return ctx, &resources +} + +func runKubectlWithResources(c *context.Context, kubectlArgs *[]string, resourceSets *[]templater.RenderedResourceSet) error { + argsWithContext := append(*kubectlArgs, fmt.Sprintf("--context=%s", c.Name)) + + for _, rs := range *resourceSets { + if len(rs.Resources) == 0 { + fmt.Fprintf(os.Stderr, "Warning: Resource set '%s' contains no valid templates\n", rs.Name) + continue + } + + argsWithResourceSetArgs := append(argsWithContext, rs.Args...) + + kubectl := exec.Command(*kubectlBin, argsWithResourceSetArgs...) + + stdin, err := kubectl.StdinPipe() + if err != nil { + return fmt.Errorf("kubectl error: %v", err) + } + + kubectl.Stdout = os.Stdout + kubectl.Stderr = os.Stderr + + if err = kubectl.Start(); err != nil { + return fmt.Errorf("kubectl error: %v", err) + } + + for _, r := range rs.Resources { + fmt.Printf("Passing file %s/%s to kubectl\n", rs.Name, r.Filename) + fmt.Fprintln(stdin, r.Rendered) + } + stdin.Close() + + if err = kubectl.Wait(); err != nil { + return err + } + } + + return nil +} + +func failWithKubectlError(err error) { + app.Fatalf("Kubectl error: %v\n", err) +} diff --git a/ops/kontemplate/release.nix b/ops/kontemplate/release.nix new file mode 100644 index 000000000000..4af08f50c7bb --- /dev/null +++ b/ops/kontemplate/release.nix @@ -0,0 +1,54 @@ +# Copyright (C) 2016-2019 Vincent Ambo <mail@tazj.in> +# +# This file is part of Kontemplate. +# +# Kontemplate is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. +# +# This file is the Nix derivation used to build release binaries for +# several different architectures and operating systems. + +let pkgs = import ((import <nixpkgs> {}).fetchFromGitHub { + owner = "NixOS"; + repo = "nixpkgs-channels"; + rev = "541d9cce8af7a490fb9085305939569567cb58e6"; + sha256 = "0jgz72hhzkd5vyq5v69vpljjlnf0lqaz7fh327bvb3cvmwbfxrja"; +}) {}; +in with pkgs; buildGoPackage rec { + name = "kontemplate-${version}"; + version = "master"; + src = ./.; + goPackagePath = "github.com/tazjin/kontemplate"; + goDeps = ./deps.nix; + + # This configuration enables the building of statically linked + # executables. For some reason, those will have multiple references + # to the Go compiler's installation path in them, which is the + # reason for setting the 'allowGoReference' flag. + dontStrip = true; # Linker configuration handles stripping + allowGoReference = true; + CGO_ENABLED="0"; + GOCACHE="off"; + + # Configure release builds via the "build-matrix" script: + buildInputs = [ git ]; + buildPhase = '' + cd go/src/${goPackagePath} + patchShebangs build-release.sh + ./build-release.sh build + ''; + + outputs = [ "out" ]; + installPhase = '' + mkdir $out + cp -r release/ $out + ''; + + meta = with lib; { + description = "A resource templating helper for Kubernetes"; + homepage = "http://kontemplate.works/"; + license = licenses.gpl3; + }; +} diff --git a/ops/kontemplate/templater/dns.go b/ops/kontemplate/templater/dns.go new file mode 100644 index 000000000000..6cd974dd9324 --- /dev/null +++ b/ops/kontemplate/templater/dns.go @@ -0,0 +1,35 @@ +// Copyright (C) 2016-2019 Vincent Ambo <mail@tazj.in> +// +// This file is part of Kontemplate. +// +// Kontemplate is free software: you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// This file contains the implementation of a template function for retrieving +// IP addresses from DNS + +package templater + +import ( + "fmt" + "net" + "os" +) + +func GetIPsFromDNS(host string) ([]interface{}, error) { + fmt.Fprintf(os.Stderr, "Attempting to look up IP for %s in DNS\n", host) + ips, err := net.LookupIP(host) + + if err != nil { + return nil, fmt.Errorf("IP address lookup failed: %v", err) + } + + var result []interface{} = make([]interface{}, len(ips)) + for i, ip := range ips { + result[i] = ip + } + + return result, nil +} diff --git a/ops/kontemplate/templater/pass.go b/ops/kontemplate/templater/pass.go new file mode 100644 index 000000000000..f7fbcb433de5 --- /dev/null +++ b/ops/kontemplate/templater/pass.go @@ -0,0 +1,34 @@ +// Copyright (C) 2016-2019 Vincent Ambo <mail@tazj.in> +// +// This file is part of Kontemplate. +// +// Kontemplate is free software: you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// This file contains the implementation of a template function for retrieving +// variables from 'pass', the standard UNIX password manager. + +package templater + +import ( + "fmt" + "os" + "os/exec" + "strings" +) + +func GetFromPass(key string) (string, error) { + fmt.Fprintf(os.Stderr, "Attempting to look up %s in pass\n", key) + pass := exec.Command("pass", "show", key) + + output, err := pass.CombinedOutput() + if err != nil { + return "", fmt.Errorf("Pass lookup failed: %s (%v)", output, err) + } + + trimmed := strings.TrimSpace(string(output)) + + return trimmed, nil +} diff --git a/ops/kontemplate/templater/templater.go b/ops/kontemplate/templater/templater.go new file mode 100644 index 000000000000..a8f0c670a603 --- /dev/null +++ b/ops/kontemplate/templater/templater.go @@ -0,0 +1,236 @@ +// Copyright (C) 2016-2019 Vincent Ambo <mail@tazj.in> +// +// This file is part of Kontemplate. +// +// Kontemplate is free software: you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. + +package templater + +import ( + "bytes" + "encoding/json" + "fmt" + "io/ioutil" + "os" + "os/exec" + "path" + "strings" + "text/template" + + "github.com/Masterminds/sprig" + "github.com/tazjin/kontemplate/context" + "github.com/tazjin/kontemplate/util" +) + +const failOnMissingKeys string = "missingkey=error" + +type RenderedResource struct { + Filename string + Rendered string +} + +type RenderedResourceSet struct { + Name string + Resources []RenderedResource + Args []string +} + +func LoadAndApplyTemplates(include *[]string, exclude *[]string, c *context.Context) ([]RenderedResourceSet, error) { + limitedResourceSets := applyLimits(&c.ResourceSets, include, exclude) + renderedResourceSets := make([]RenderedResourceSet, 0) + + if len(*limitedResourceSets) == 0 { + return renderedResourceSets, fmt.Errorf("No valid resource sets included!") + } + + for _, rs := range *limitedResourceSets { + set, err := processResourceSet(c, &rs) + + if err != nil { + return nil, err + } + + renderedResourceSets = append(renderedResourceSets, *set) + } + + return renderedResourceSets, nil +} + +func processResourceSet(ctx *context.Context, rs *context.ResourceSet) (*RenderedResourceSet, error) { + fmt.Fprintf(os.Stderr, "Loading resources for %s\n", rs.Name) + + fileInfo, err := os.Stat(rs.Path) + if err != nil { + return nil, err + } + + var files []os.FileInfo + var resources []RenderedResource + + // Treat single-file resource paths separately from resource + // sets containing multiple templates + if fileInfo.IsDir() { + // Explicitly discard this error, which will give us an empty + // list of files instead. + // This will end up printing a warning to the user, but it + // won't stop the rest of the process. + files, _ = ioutil.ReadDir(rs.Path) + resources, err = processFiles(ctx, rs, files) + if err != nil { + return nil, err + } + } else { + resource, err := templateFile(ctx, rs, rs.Path) + if err != nil { + return nil, err + } + + resources = []RenderedResource{resource} + } + + return &RenderedResourceSet{ + Name: rs.Name, + Resources: resources, + Args: rs.Args, + }, nil +} + +func processFiles(ctx *context.Context, rs *context.ResourceSet, files []os.FileInfo) ([]RenderedResource, error) { + resources := make([]RenderedResource, 0) + + for _, file := range files { + if !file.IsDir() && isResourceFile(file) { + path := path.Join(rs.Path, file.Name()) + res, err := templateFile(ctx, rs, path) + + if err != nil { + return resources, err + } + + resources = append(resources, res) + } + } + + return resources, nil +} + +func templateFile(ctx *context.Context, rs *context.ResourceSet, filepath string) (RenderedResource, error) { + var resource RenderedResource + + tpl, err := template.New(path.Base(filepath)).Funcs(templateFuncs(ctx, rs)).Option(failOnMissingKeys).ParseFiles(filepath) + if err != nil { + return resource, fmt.Errorf("Could not load template %s: %v", filepath, err) + } + + var b bytes.Buffer + err = tpl.Execute(&b, rs.Values) + if err != nil { + return resource, fmt.Errorf("Error while templating %s: %v", filepath, err) + } + + resource = RenderedResource{ + Filename: path.Base(filepath), + Rendered: b.String(), + } + + return resource, nil +} + +// Applies the limits of explicitly included or excluded resources and returns the updated resource set. +// Exclude takes priority over include +func applyLimits(rs *[]context.ResourceSet, include *[]string, exclude *[]string) *[]context.ResourceSet { + if len(*include) == 0 && len(*exclude) == 0 { + return rs + } + + // Exclude excluded resource sets + excluded := make([]context.ResourceSet, 0) + for _, r := range *rs { + if !matchesResourceSet(exclude, &r) { + excluded = append(excluded, r) + } + } + + // Include included resource sets + if len(*include) == 0 { + return &excluded + } + included := make([]context.ResourceSet, 0) + for _, r := range excluded { + if matchesResourceSet(include, &r) { + included = append(included, r) + } + } + + return &included +} + +// Check whether an include/exclude string slice matches a resource set +func matchesResourceSet(s *[]string, rs *context.ResourceSet) bool { + for _, r := range *s { + r = strings.TrimSuffix(r, "/") + if r == rs.Name || r == rs.Parent { + return true + } + } + + return false +} + +func templateFuncs(c *context.Context, rs *context.ResourceSet) template.FuncMap { + m := sprig.TxtFuncMap() + m["json"] = func(data interface{}) string { + b, _ := json.Marshal(data) + return string(b) + } + m["passLookup"] = GetFromPass + m["gitHEAD"] = func() (string, error) { + out, err := exec.Command("git", "-C", c.BaseDir, "rev-parse", "HEAD").Output() + if err != nil { + return "", err + } + output := strings.TrimSpace(string(out)) + return output, nil + } + m["lookupIPAddr"] = GetIPsFromDNS + m["insertFile"] = func(file string) (string, error) { + data, err := ioutil.ReadFile(path.Join(rs.Path, file)) + if err != nil { + return "", err + } + + return string(data), nil + } + m["insertTemplate"] = func(file string) (string, error) { + data, err := templateFile(c, rs, path.Join(rs.Path, file)) + if err != nil { + return "", err + } + + return data.Rendered, nil + } + m["default"] = func(defaultVal interface{}, varName string) interface{} { + if val, ok := rs.Values[varName]; ok { + return val + } + + return defaultVal + } + return m +} + +// Checks whether a file is a resource file (i.e. is YAML or JSON) and not a default values file. +func isResourceFile(f os.FileInfo) bool { + for _, defaultFile := range util.DefaultFilenames { + if f.Name() == defaultFile { + return false + } + } + + return strings.HasSuffix(f.Name(), "yaml") || + strings.HasSuffix(f.Name(), "yml") || + strings.HasSuffix(f.Name(), "json") +} diff --git a/ops/kontemplate/templater/templater_test.go b/ops/kontemplate/templater/templater_test.go new file mode 100644 index 000000000000..c20858c203b4 --- /dev/null +++ b/ops/kontemplate/templater/templater_test.go @@ -0,0 +1,205 @@ +// Copyright (C) 2016-2019 Vincent Ambo <mail@tazj.in> +// +// This file is part of Kontemplate. +// +// Kontemplate is free software: you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. + +package templater + +import ( + "github.com/tazjin/kontemplate/context" + "reflect" + "strings" + "testing" +) + +func TestApplyNoLimits(t *testing.T) { + resources := []context.ResourceSet{ + { + Name: "testResourceSet1", + }, + { + Name: "testResourceSet2", + }, + } + + result := applyLimits(&resources, &[]string{}, &[]string{}) + + if !reflect.DeepEqual(resources, *result) { + t.Error("Resource set slice changed, but shouldn't have.") + t.Errorf("Expected: %v\nResult: %v\n", resources, *result) + t.Fail() + } +} + +func TestApplyIncludeLimits(t *testing.T) { + resources := []context.ResourceSet{ + { + Name: "testResourceSet1", + }, + { + Name: "testResourceSet2", + }, + { + Name: "testResourceSet3", + Parent: "included", + }, + } + + includes := []string{"testResourceSet1", "included"} + + result := applyLimits(&resources, &includes, &[]string{}) + + expected := []context.ResourceSet{ + { + Name: "testResourceSet1", + }, + { + Name: "testResourceSet3", + Parent: "included", + }, + } + + if !reflect.DeepEqual(expected, *result) { + t.Error("Result does not contain expected resource sets.") + t.Errorf("Expected: %v\nResult: %v\n", expected, *result) + t.Fail() + } +} + +func TestApplyExcludeLimits(t *testing.T) { + resources := []context.ResourceSet{ + { + Name: "testResourceSet1", + }, + { + Name: "testResourceSet2", + }, + { + Name: "testResourceSet3", + Parent: "included", + }, + } + + exclude := []string{"testResourceSet2"} + + result := applyLimits(&resources, &[]string{}, &exclude) + + expected := []context.ResourceSet{ + { + Name: "testResourceSet1", + }, + { + Name: "testResourceSet3", + Parent: "included", + }, + } + + if !reflect.DeepEqual(expected, *result) { + t.Error("Result does not contain expected resource sets.") + t.Errorf("Expected: %v\nResult: %v\n", expected, *result) + t.Fail() + } +} + +func TestApplyLimitsExcludeIncludePrecedence(t *testing.T) { + resources := []context.ResourceSet{ + { + Name: "collection/nested1", + Parent: "collection", + }, + { + Name: "collection/nested2", + Parent: "collection", + }, + { + Name: "collection/nested3", + Parent: "collection", + }, + { + Name: "something-else", + }, + } + + include := []string{"collection"} + exclude := []string{"collection/nested2"} + + result := applyLimits(&resources, &include, &exclude) + + expected := []context.ResourceSet{ + { + Name: "collection/nested1", + Parent: "collection", + }, + { + Name: "collection/nested3", + Parent: "collection", + }, + } + + if !reflect.DeepEqual(expected, *result) { + t.Error("Result does not contain expected resource sets.") + t.Errorf("Expected: %v\nResult: %v\n", expected, *result) + t.Fail() + } +} + +func TestFailOnMissingKeys(t *testing.T) { + ctx := context.Context{} + resourceSet := context.ResourceSet{} + + _, err := templateFile(&ctx, &resourceSet, "testdata/test-template.txt") + + if err == nil { + t.Errorf("Template with missing keys should have failed.\n") + t.Fail() + } + + if !strings.Contains(err.Error(), "map has no entry for key \"testName\"") { + t.Errorf("Templating failed with unexpected error: %v\n", err) + } +} + +func TestDefaultTemplateFunction(t *testing.T) { + ctx := context.Context{} + resourceSet := context.ResourceSet{} + + res, err := templateFile(&ctx, &resourceSet, "testdata/test-default.txt") + + if err != nil { + t.Errorf("Templating with default values should have succeeded.\n") + t.Fail() + } + + if res.Rendered != "defaultValue\n" { + t.Error("Result does not contain expected rendered default value.") + t.Fail() + } +} + +func TestInsertTemplateFunction(t *testing.T) { + ctx := context.Context{} + resourceSet := context.ResourceSet{ + Path: "testdata", + Values: map[string]interface{}{ + "testName": "TestInsertTemplateFunction", + }, + } + + res, err := templateFile(&ctx, &resourceSet, "testdata/test-insertTemplate.txt") + + if err != nil { + t.Error(err) + t.Errorf("Templating with an insertTemplate call should have succeeded.\n") + t.Fail() + } + + if res.Rendered != "Inserting \"Template for test TestInsertTemplateFunction\".\n" { + t.Error("Result does not contain expected rendered template value.") + t.Error(res.Rendered) + t.Fail() + } +} diff --git a/ops/kontemplate/templater/testdata/test-default.txt b/ops/kontemplate/templater/testdata/test-default.txt new file mode 100644 index 000000000000..4f7997bd69d2 --- /dev/null +++ b/ops/kontemplate/templater/testdata/test-default.txt @@ -0,0 +1 @@ +{{ default "defaultValue" "missingVar" }} diff --git a/ops/kontemplate/templater/testdata/test-insertTemplate.txt b/ops/kontemplate/templater/testdata/test-insertTemplate.txt new file mode 100644 index 000000000000..8155e174fe00 --- /dev/null +++ b/ops/kontemplate/templater/testdata/test-insertTemplate.txt @@ -0,0 +1 @@ +Inserting "{{ insertTemplate "test-template.txt" | trim }}". diff --git a/ops/kontemplate/templater/testdata/test-template.txt b/ops/kontemplate/templater/testdata/test-template.txt new file mode 100644 index 000000000000..06f1cfc630c3 --- /dev/null +++ b/ops/kontemplate/templater/testdata/test-template.txt @@ -0,0 +1 @@ +Template for test {{ .testName }} diff --git a/ops/kontemplate/util/util.go b/ops/kontemplate/util/util.go new file mode 100644 index 000000000000..56fa1e3fc9c5 --- /dev/null +++ b/ops/kontemplate/util/util.go @@ -0,0 +1,58 @@ +// Copyright (C) 2016-2019 Vincent Ambo <mail@tazj.in> +// +// This file is part of Kontemplate. +// +// Kontemplate is free software: you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. + +package util + +import ( + "io/ioutil" + + "github.com/ghodss/yaml" +) + +// Filenames excluded from templating for the purpose of containing default variable values inside a resource set. +var DefaultFilenames []string = []string{"default.yml", "default.yaml", "default.json"} + +// Merges two maps together. Values from the second map override values in the first map. +// The returned map is new if anything was changed. +func Merge(in1 *map[string]interface{}, in2 *map[string]interface{}) *map[string]interface{} { + if in1 == nil || len(*in1) == 0 { + return in2 + } + + if in2 == nil || len(*in2) == 0 { + return in1 + } + + new := make(map[string]interface{}) + for k, v := range *in1 { + new[k] = v + } + + for k, v := range *in2 { + new[k] = v + } + + return &new +} + +// Loads either a YAML or JSON file from the specified path and +// deserialises it into the provided interface. +func LoadData(filename string, addr interface{}) error { + file, err := ioutil.ReadFile(filename) + if err != nil { + return err + } + + err = yaml.Unmarshal(file, addr) + if err != nil { + return err + } + + return nil +} diff --git a/ops/kontemplate/util/util_test.go b/ops/kontemplate/util/util_test.go new file mode 100644 index 000000000000..53c56081758c --- /dev/null +++ b/ops/kontemplate/util/util_test.go @@ -0,0 +1,83 @@ +// Copyright (C) 2016-2019 Vincent Ambo <mail@tazj.in> +// +// This file is part of Kontemplate. +// +// Kontemplate is free software: you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. + +package util + +import ( + "reflect" + "testing" +) + +func TestMergeWithEmptyMap(t *testing.T) { + testMap := map[string]interface{}{ + "foo": "bar", + } + + empty := make(map[string]interface{}) + + res1 := Merge(&testMap, &empty) + res2 := Merge(&empty, &testMap) + + if res1 != &testMap || res2 != &testMap { + t.Error("A new map was returned incorrectly.") + t.Fail() + } +} + +func TestMergeWithNilMap(t *testing.T) { + testMap := map[string]interface{}{ + "foo": "bar", + } + + res1 := Merge(&testMap, nil) + res2 := Merge(nil, &testMap) + + if res1 != &testMap || res2 != &testMap { + t.Error("A new map was returned incorrectly.") + t.Fail() + } +} + +func TestMergeMaps(t *testing.T) { + map1 := map[string]interface{}{ + "foo": "bar", + } + + map2 := map[string]interface{}{ + "bar": "baz", + } + + result := Merge(&map1, &map2) + expected := map[string]interface{}{ + "foo": "bar", + "bar": "baz", + } + + if !reflect.DeepEqual(*result, expected) { + t.Error("Maps were merged incorrectly.") + t.Fail() + } +} + +func TestMergeMapsPrecedence(t *testing.T) { + map1 := map[string]interface{}{ + "foo": "incorrect", + } + + map2 := map[string]interface{}{ + "foo": "correct", + } + + result := Merge(&map1, &map2) + + if (*result)["foo"] != "correct" { + t.Error("Map merge precedence test failed.") + t.Fail() + } +} |