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// Copyright 2019 Google LLC.
// SPDX-License-Identifier: Apache-2.0
//
// sync-gcsr implements a small utility that periodically mirrors a
// remote Google Cloud Source Repository to a local file path.
//
// This utility is also responsible for triggering depot builds on
// builds.sr.ht if a change is detected on the master branch.
package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net/http"
"os"
"time"
"bytes"
git "gopkg.in/src-d/go-git.v4"
"gopkg.in/src-d/go-git.v4/plumbing"
githttp "gopkg.in/src-d/go-git.v4/plumbing/transport/http"
)
// Path to the build manifest, added by Nix at compile time.
var BuildManifest string
// Represents a builds.sr.ht build object as described on
// https://man.sr.ht/builds.sr.ht/api.md
type Build struct {
Manifest string `json:"manifest"`
Note string `json:"note"`
Tags []string `json:"tags"`
}
func EnvOr(key, def string) string {
v := os.Getenv(key)
if v == "" {
return def
}
return v
}
// Trigger a build of master on builds.sr.ht
func triggerBuild(commit string) {
manifest, err := ioutil.ReadFile(BuildManifest)
if err != nil {
log.Fatalln("[ERROR] failed to read sr.ht build manifest:", err)
}
build := Build{
Manifest: string(manifest),
Note: fmt.Sprintf("Build of 'master' at '%s'", commit),
Tags: []string{
"tazjins-depot", "master",
},
}
body, _ := json.Marshal(build)
reader := ioutil.NopCloser(bytes.NewReader(body))
req, err := http.NewRequest("POST", "https://builds.sr.ht/api/jobs", reader)
if err != nil {
log.Fatalln("[ERROR] failed to create an HTTP request:", err)
}
req.Header.Add("Authorization", fmt.Sprintf("token %s", os.Getenv("SRHT_TOKEN")))
req.Header.Add("Content-Type", "application/json")
resp, err := http.DefaultClient.Do(req)
if err != nil {
// This might indicate a temporary error on the SourceHut side, do
// not fail the whole program.
log.Println("failed to send builds.sr.ht request:", err)
return
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
respBody, err := ioutil.ReadAll(resp.Body)
log.Printf("received non-success response from builds.sr.ht: %s (%v)[%s]", respBody, resp.Status, err)
}
}
// ensure that all remote branches exist locally & are up to date.
func updateBranches(auth *githttp.BasicAuth, repo *git.Repository) error {
origin, err := repo.Remote("origin")
if err != nil {
return err
}
refs, err := origin.List(&git.ListOptions{
Auth: auth,
})
if err != nil {
return err
}
for _, ref := range refs {
if !ref.Name().IsBranch() || ref.Type() != plumbing.HashReference {
continue
}
name := plumbing.NewBranchReferenceName(ref.Name().Short())
if current, err := repo.Storer.Reference(name); err == nil {
// Determine whether the reference has changed to skip
// unnecessary modifications.
if current.Hash() == ref.Hash() {
continue
}
}
branch := plumbing.NewHashReference(name, ref.Hash())
err := repo.Storer.SetReference(branch)
if err != nil {
return err
}
if ref.Name().Short() == "master" {
go triggerBuild(ref.Hash().String())
}
log.Println("Updated branch", ref.Name().String())
}
return nil
}
func updateRepo(auth *githttp.BasicAuth, repo *git.Repository, opts *git.FetchOptions) error {
err := repo.Fetch(opts)
if err == git.NoErrAlreadyUpToDate {
// nothing to do ...
return nil
} else if err != nil {
return err
}
log.Println("Fetched updates from remote, updating local branches")
return updateBranches(auth, repo)
}
func cloneRepo(dest, project, repo string, auth *githttp.BasicAuth) (*git.Repository, error) {
var cloneOpts = git.CloneOptions{
Auth: auth,
URL: fmt.Sprintf("https://source.developers.google.com/p/%s/r/%s", project, repo),
}
handle, err := git.PlainClone(dest, true, &cloneOpts)
if err == git.ErrRepositoryAlreadyExists {
handle, err = git.PlainOpen(dest)
}
return handle, updateBranches(auth, handle)
}
func main() {
dest := EnvOr("SYNC_DEST", "/git/depot")
project := EnvOr("SYNC_PROJECT", "tazjins-infrastructure")
repo := EnvOr("SYNC_REPO", "depot")
user := os.Getenv("SYNC_USER")
pass := os.Getenv("SYNC_PASS")
log.Printf("Syncing repository '%s/%s' to destination '%s'", project, repo, dest)
var auth *githttp.BasicAuth
if user != "" && pass != "" {
auth = &githttp.BasicAuth{
Username: user,
Password: pass,
}
log.Println("Enabling basic authentication as user", user)
}
handle, err := cloneRepo(dest, project, repo, auth)
if err != nil {
log.Fatalf("Failed to clone repository: %s", err)
} else {
log.Println("Initiating update loop")
}
fetchOpts := git.FetchOptions{
Auth: auth,
Force: true,
}
for {
if err = updateRepo(auth, handle, &fetchOpts); err != nil {
log.Fatalf("Failed to pull updated repository: %s", err)
}
time.Sleep(10 * time.Second)
}
}
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