refactor(server): Move package source management logic to server

Introduces three new types representing each of the possible package
sources and moves the logic for specifying the package source to the
server.

Concrete changes:

* Determining whether a specified git reference is a commit vs. a
  branch/tag is now done in the server, and is done more precisely by
  using a regular expression.

* Package sources now have a new `CacheKey` function which can be used
  to retrieve a key under which a build manifest can be cached *if*
  the package source is not a moving target (i.e. a full git commit
  hash of either nixpkgs or a private repository).

  This function is not yet used.

* Users *must* now specify a package source, Nixery no longer defaults
  to anything and will fail to launch if no source is configured.

1 files changed, 9 insertions, 57 deletions

diff --git a/tools/nixery/server/config/config.go b/tools/nixery/server/config/config.go
index 5fba0e658a..ea1bb1ab45 100644
--- a/tools/nixery/server/config/config.go
+++ b/tools/nixery/server/config/config.go
@@ -18,7 +18,6 @@
 package config
 
 import (
-	"fmt"
 	"io/ioutil"
 	"log"
 	"os"
@@ -26,58 +25,6 @@ import (
 	"cloud.google.com/go/storage"
 )
 
-// pkgSource represents the source from which the Nix package set used
-// by Nixery is imported. Users configure the source by setting one of
-// the supported environment variables.
-type PkgSource struct {
-	srcType string
-	args    string
-}
-
-// Convert the package source into the representation required by Nix.
-func (p *PkgSource) Render(tag string) string {
-	// The 'git' source requires a tag to be present.
-	if p.srcType == "git" {
-		if tag == "latest" || tag == "" {
-			tag = "master"
-		}
-
-		return fmt.Sprintf("git!%s!%s", p.args, tag)
-	}
-
-	return fmt.Sprintf("%s!%s", p.srcType, p.args)
-}
-
-// Retrieve a package source from the environment. If no source is
-// specified, the Nix code will default to a recent NixOS channel.
-func pkgSourceFromEnv() *PkgSource {
-	if channel := os.Getenv("NIXERY_CHANNEL"); channel != "" {
-		log.Printf("Using Nix package set from Nix channel %q\n", channel)
-		return &PkgSource{
-			srcType: "nixpkgs",
-			args:    channel,
-		}
-	}
-
-	if git := os.Getenv("NIXERY_PKGS_REPO"); git != "" {
-		log.Printf("Using Nix package set from git repository at %q\n", git)
-		return &PkgSource{
-			srcType: "git",
-			args:    git,
-		}
-	}
-
-	if path := os.Getenv("NIXERY_PKGS_PATH"); path != "" {
-		log.Printf("Using Nix package set from path %q\n", path)
-		return &PkgSource{
-			srcType: "path",
-			args:    path,
-		}
-	}
-
-	return nil
-}
-
 // Load (optional) GCS bucket signing data from the GCS_SIGNING_KEY and
 // GCS_SIGNING_ACCOUNT envvars.
 func signingOptsFromEnv() *storage.SignedURLOptions {
@@ -118,18 +65,23 @@ type Config struct {
 	Bucket  string                    // GCS bucket to cache & serve layers
 	Signing *storage.SignedURLOptions // Signing options to use for GCS URLs
 	Port    string                    // Port on which to launch HTTP server
-	Pkgs    *PkgSource                // Source for Nix package set
+	Pkgs    PkgSource                 // Source for Nix package set
 	Timeout string                    // Timeout for a single Nix builder (seconds)
 	WebDir  string                    // Directory with static web assets
 }
 
-func FromEnv() *Config {
+func FromEnv() (*Config, error) {
+	pkgs, err := pkgSourceFromEnv()
+	if err != nil {
+		return nil, err
+	}
+
 	return &Config{
 		Bucket:  getConfig("BUCKET", "GCS bucket for layer storage", ""),
 		Port:    getConfig("PORT", "HTTP port", ""),
-		Pkgs:    pkgSourceFromEnv(),
+		Pkgs:    pkgs,
 		Signing: signingOptsFromEnv(),
 		Timeout: getConfig("NIX_TIMEOUT", "Nix builder timeout", "60"),
 		WebDir:  getConfig("WEB_DIR", "Static web file dir", ""),
-	}
+	}, nil
 }