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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.
package main
import (
"fmt"
"log"
"os"
"time"
git "gopkg.in/src-d/go-git.v4"
"gopkg.in/src-d/go-git.v4/plumbing"
"gopkg.in/src-d/go-git.v4/plumbing/transport/http"
)
func EnvOr(key, def string) string {
v := os.Getenv(key)
if v == "" {
return def
}
return v
}
// ensure that all remote branches exist locally & are up to date.
func updateBranches(auth *http.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
}
log.Println("Updated branch", ref.Name().String())
}
return nil
}
func updateRepo(auth *http.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 *http.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 *http.BasicAuth
if user != "" && pass != "" {
auth = &http.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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