feat(besadii): Adapt into a Gerrit ref-updated-hook
Besadii was previously invoked as a git post-update hook, but Gerrit does not use these hooks and instead has its own concept of hooks. This change adapts besadii to be compatible with the way Gerrit hooks are invoked (arguments being passed as flags, rather than via stdin). Change-Id: I487b3a9e15810583bc5442fdc024ee2771c580cb
This commit is contained in:
Vincent Ambo
parent
8735c63e97
commit
b094e65bfc
2 changed files with 62 additions and 67 deletions
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@ -5,8 +5,4 @@
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depot.buildGo.program {
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name = "besadii";
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srcs = [ ./main.go ];
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x_defs = {
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"main.gitBin" = "${depot.third_party.git}/bin/git";
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};
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}
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@ -1,40 +1,35 @@
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// Copyright 2019 Google LLC.
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// Copyright 2019-2020 Google LLC.
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// SPDX-License-Identifier: Apache-2.0
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//
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// besadii is a small CLI tool that triggers depot builds on
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// builds.sr.ht
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//
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// It is designed to run as a post-update git hook on the server
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// hosting the depot.
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// It is designed to run as a Gerrit hook (ref-updated).
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package main
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import (
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"bufio"
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"bytes"
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"encoding/json"
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"flag"
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"fmt"
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"io/ioutil"
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"log/syslog"
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"net/http"
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"os"
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"os/exec"
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"path"
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"strings"
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)
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var gitBin = "git"
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var branchPrefix = "refs/heads/"
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// This value is set by the git hook invocation when a branch is
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// removed, builds should not be triggered in that case.
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var deletedBranch = "0000000000000000000000000000000000000000"
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// Represents an updated reference as passed to besadii by git
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// Represents an updated branch, as passed to besadii by Gerrit.
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//
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// https://git-scm.com/docs/githooks#pre-receive
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type refUpdate struct {
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name string
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old string
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new string
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// https://gerrit.googlesource.com/plugins/hooks/+/HEAD/src/main/resources/Documentation/hooks.md#ref_updated
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type branchUpdate struct {
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project string
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branch string
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commit string
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submitter string
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}
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// Represents a builds.sr.ht build object as described on
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@ -45,8 +40,8 @@ type Build struct {
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Tags []string `json:"tags"`
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}
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// Represents a build trigger object as described on <the docs for
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// this are currently down>
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// Represents a build trigger object as described on
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// https://man.sr.ht/builds.sr.ht/triggers.md
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type Trigger struct {
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Action string `json:"action"`
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Condition string `json:"condition"`
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@ -96,14 +91,14 @@ cat built-paths | cachix push tazjin`},
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}
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// Trigger a build of a given branch & commit on builds.sr.ht
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func triggerBuild(log *syslog.Writer, token, branch, commit string) {
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func triggerBuild(log *syslog.Writer, token string, update *branchUpdate) {
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build := Build{
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Manifest: prepareManifest(commit),
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Note: fmt.Sprintf("Build of '%s' at '%s'", branch, commit),
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Manifest: prepareManifest(update.commit),
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Note: fmt.Sprintf("build of %q at %q, submitted by %q", update.branch, update.commit, update.submitter),
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Tags: []string{
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// my branch names tend to contain slashes, which are not valid
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// identifiers in sourcehut.
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"depot", strings.ReplaceAll(branch, "/", "_"),
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"depot", strings.ReplaceAll(update.branch, "/", "_"),
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},
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}
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@ -132,39 +127,52 @@ func triggerBuild(log *syslog.Writer, token, branch, commit string) {
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respBody, _ := ioutil.ReadAll(resp.Body)
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log.Err(fmt.Sprintf("received non-success response from builds.sr.ht: %s (%v)", respBody, resp.Status))
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} else {
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fmt.Fprintf(log, "triggered builds.sr.ht job for branch '%s' at commit '%s'", branch, commit)
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fmt.Fprintf(log, "triggered builds.sr.ht job for branch %q at commit %q", update.branch, update.commit)
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}
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}
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func parseRefUpdates() ([]refUpdate, error) {
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var updates []refUpdate
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scanner := bufio.NewScanner(os.Stdin)
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for scanner.Scan() {
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line := scanner.Text()
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fragments := strings.Split(line, " ")
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if len(fragments) != 3 {
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return nil, fmt.Errorf("invalid ref update: '%s'", line)
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}
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update := refUpdate{
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old: fragments[0],
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new: fragments[1],
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name: fragments[2],
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}
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if strings.HasPrefix(update.name, branchPrefix) && update.new != deletedBranch {
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update.name = strings.TrimPrefix(update.name, branchPrefix)
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updates = append(updates, update)
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}
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func branchUpdateFromFlags() (*branchUpdate, error) {
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if path.Base(os.Args[0]) != "ref-updated" {
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return nil, fmt.Errorf("besadii must be invoked as the 'ref-updated' hook")
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}
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if err := scanner.Err(); err != nil {
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return nil, err
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var update branchUpdate
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flag.StringVar(&update.project, "project", "", "Gerrit project")
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flag.StringVar(&update.commit, "newrev", "", "new revision")
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flag.StringVar(&update.submitter, "submitter-username", "", "Submitter username")
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ref := flag.String("refname", "", "updated reference name")
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// Gerrit passes more flags than we want, but Rob Pike decided[0] in
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// 2013 that the Go art project will not allow users to ignore flags
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// because he "doesn't like it". The following code ignores the
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// flags.
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//
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// [0]: https://github.com/golang/go/issues/6112#issuecomment-66083768
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var _old, _submitter string
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flag.StringVar(&_old, "oldrev", "", "")
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flag.StringVar(&_submitter, "submitter", "", "")
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flag.Parse()
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if update.project == "" || *ref == "" || update.commit == "" || update.submitter == "" {
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// If we get here, the user is probably being a dummy and invoking
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// this manually - but incorrectly.
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return nil, fmt.Errorf("'ref-updated' hook invoked without required arguments")
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}
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return updates, nil
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if update.project != "depot" {
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// this is not an error, but also not something we handle.
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return nil, nil
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}
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if !strings.HasPrefix(*ref, branchPrefix) {
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return nil, fmt.Errorf("besadii only supports branch updates at the moment")
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}
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update.branch = strings.TrimPrefix(*ref, branchPrefix)
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return &update, nil
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}
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func main() {
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@ -174,30 +182,21 @@ func main() {
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os.Exit(1)
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}
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// Before triggering builds, it is important that git
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// update-server-info is run so that cgit correctly serves the
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// repository.
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err = exec.Command(gitBin, "update-server-info").Run()
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if err != nil {
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log.Alert("failed to run 'git update-server-info' for depot!")
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os.Exit(1)
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}
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token, err := ioutil.ReadFile("/etc/secrets/srht-token")
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if err != nil {
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log.Alert("sourcehot token could not be read")
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os.Exit(1)
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}
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updates, err := parseRefUpdates()
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update, err := branchUpdateFromFlags()
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if err != nil {
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log.Err(fmt.Sprintf("could not parse updated refs:", err))
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log.Err(fmt.Sprintf("failed to parse ref update: %s", err))
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os.Exit(1)
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}
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fmt.Fprintf(log, "triggering builds for %v refs", len(updates))
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for _, update := range updates {
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triggerBuild(log, string(token), update.name, update.new)
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if update == nil { // the project was not 'depot'
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os.Exit(0)
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}
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triggerBuild(log, string(token), update)
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}
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