1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
// Copyright 2019-2020 Google LLC.
// SPDX-License-Identifier: Apache-2.0
//
// besadii is a small CLI tool that runs as a Gerrit hook (currently
// 'ref-updated') to trigger various actions:
//
// - Buildkite CI builds
// - SourceGraph (cs.tvl.fyi) repository index updates
package main
import (
"bytes"
"encoding/json"
"flag"
"fmt"
"io/ioutil"
"log/syslog"
"net/http"
"os"
"path"
"strings"
)
var branchPrefix = "refs/heads/"
// Represents an updated branch, as passed to besadii by Gerrit.
//
// https://gerrit.googlesource.com/plugins/hooks/+/HEAD/src/main/resources/Documentation/hooks.md#ref_updated
type branchUpdate struct {
project string
branch string
commit string
submitter string
email string
}
type Author struct {
Name string `json:"name"`
Email string `json:"email"`
}
// Build is the representation of a Buildkite build as described on
// https://buildkite.com/docs/apis/rest-api/builds#create-a-build
type Build struct {
Commit string `json:"commit"`
Branch string `json:"branch"`
Message string `json:"message"`
Author Author `json:"author"`
}
// Trigger a build of a given branch & commit on Buildkite
func triggerBuild(log *syslog.Writer, token string, update *branchUpdate) error {
build := Build{
Commit: update.commit,
Branch: update.branch,
Message: fmt.Sprintf("Build of %q branch %q at %q", update.project, update.branch, update.commit),
Author: Author{
Name: update.submitter,
Email: update.email,
},
}
body, _ := json.Marshal(build)
reader := ioutil.NopCloser(bytes.NewReader(body))
req, err := http.NewRequest("POST", "https://api.buildkite.com/v2/organizations/tvl/pipelines/depot/builds", reader)
if err != nil {
return fmt.Errorf("failed to create an HTTP request: %w", err)
}
req.Header.Add("Authorization", "Bearer "+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 Buildkite side.
return fmt.Errorf("failed to send Buildkite request: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode != 201 {
respBody, _ := ioutil.ReadAll(resp.Body)
log.Err(fmt.Sprintf("received non-success response from Buildkite: %s (%v)", respBody, resp.Status))
} else {
fmt.Fprintf(log, "triggered Buildkite build for branch %q at commit %q", update.branch, update.commit)
}
return nil
}
// Trigger a Sourcegraph repository index update on cs.tvl.fyi.
//
// https://docs.sourcegraph.com/admin/repo/webhooks
func triggerIndexUpdate(token string) error {
req, err := http.NewRequest("POST", "https://cs.tvl.fyi/.api/repos/depot/-/refresh", nil)
if err != nil {
return err
}
req.Header.Add("Authorization", "token "+token)
_, err = http.DefaultClient.Do(req)
return err
}
func branchUpdateFromFlags() (*branchUpdate, error) {
if path.Base(os.Args[0]) != "ref-updated" {
return nil, fmt.Errorf("besadii must be invoked as the 'ref-updated' hook")
}
var update branchUpdate
flag.StringVar(&update.project, "project", "", "Gerrit project")
flag.StringVar(&update.commit, "newrev", "", "new revision")
flag.StringVar(&update.email, "submitter", "", "Submitter email")
flag.StringVar(&update.submitter, "submitter-username", "", "Submitter username")
ref := flag.String("refname", "", "updated reference name")
// Gerrit passes more flags than we want, but Rob Pike decided[0] in
// 2013 that the Go art project will not allow users to ignore flags
// because he "doesn't like it". The following code ignores the
// flags.
//
// [0]: https://github.com/golang/go/issues/6112#issuecomment-66083768
var _old string
flag.StringVar(&_old, "oldrev", "", "")
flag.Parse()
if update.project == "" || *ref == "" || update.commit == "" || update.submitter == "" {
// If we get here, the user is probably being a dummy and invoking
// this manually - but incorrectly.
return nil, fmt.Errorf("'ref-updated' hook invoked without required arguments")
}
if update.project != "depot" {
// this is not an error, but also not something we handle.
return nil, nil
}
if !strings.HasPrefix(*ref, branchPrefix) {
return nil, fmt.Errorf("besadii only supports branch updates at the moment")
}
update.branch = strings.TrimPrefix(*ref, branchPrefix)
return &update, nil
}
func main() {
log, err := syslog.New(syslog.LOG_INFO|syslog.LOG_USER, "besadii")
if err != nil {
fmt.Printf("failed to open syslog: %s\n", err)
os.Exit(1)
}
buildkiteToken, err := ioutil.ReadFile("/etc/secrets/buildkite-besadii")
if err != nil {
log.Alert(fmt.Sprintf("buildkite token could not be read: %s", err))
os.Exit(1)
}
sourcegraphToken, err := ioutil.ReadFile("/etc/secrets/sourcegraph-token")
if err != nil {
log.Alert(fmt.Sprintf("sourcegraph token could not be read: %s", err))
os.Exit(1)
}
update, err := branchUpdateFromFlags()
if err != nil {
log.Err(fmt.Sprintf("failed to parse ref update: %s", err))
os.Exit(1)
}
if update == nil { // the project was not 'depot'
os.Exit(0)
}
err = triggerBuild(log, string(buildkiteToken), update)
if err != nil {
log.Err(fmt.Sprintf("failed to trigger Buildkite build: %s", err))
}
err = triggerIndexUpdate(string(sourcegraphToken))
if err != nil {
log.Err(fmt.Sprintf("failed to trigger sourcegraph index update: %s", err))
}
log.Info("triggered sourcegraph index update")
}
|
