From 83a38a6da9ef99bc6596f6cfb53395a89f0165c7 Mon Sep 17 00:00:00 2001
From: Franck Cuny <franck@fcuny.net>
Date: Mon, 30 May 2022 13:32:43 -0700
Subject: feat(gerrit-hook): a small tool to act as a dispatcher for gerrit

When a patchset is created, gerrit will call this tool with a number of
arguments.

This hook triggers a build with buildKite for the given patchset, and
add a comment to gerrit with a link to the build.

We do not wait for the build to be successful to update gerrit. This
will be done by another hook which the buildKite agents will call once
they are done with the build.

Change-Id: Iaa221765f3c52875ec37c5d282ba0557291eb5a4
Reviewed-on: https://cl.fcuny.net/c/world/+/171
Reviewed-by: Franck Cuny <franck@fcuny.net>
---
 tools/gerrit-hook/main.go | 64 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 tools/gerrit-hook/main.go

(limited to 'tools/gerrit-hook/main.go')

diff --git a/tools/gerrit-hook/main.go b/tools/gerrit-hook/main.go
new file mode 100644
index 0000000..f8ed687
--- /dev/null
+++ b/tools/gerrit-hook/main.go
@@ -0,0 +1,64 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"log/syslog"
+	"os"
+	"path"
+)
+
+// config represents the configuration for the gerrit hook
+type config struct {
+	GerritUrl             string `json:"gerritUrl"`
+	GerritUser            string `json:"gerritUser"`
+	GerritPassword        string `json:"gerritPassword"`
+	BuildKiteToken        string `json:"buildKiteToken"`
+	BuildKiteOrganization string `json:"buildKiteOrganization"`
+}
+
+func loadConfig() (*config, error) {
+	configPath := "/var/run/agenix/gerrit/hooks"
+
+	configJson, err := ioutil.ReadFile(configPath)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read configuration file %s: %v", configPath, err)
+	}
+
+	var cfg config
+	err = json.Unmarshal(configJson, &cfg)
+	if err != nil {
+		return nil, fmt.Errorf("failed to unmarshall configuration: %v", err)
+	}
+
+	return &cfg, nil
+}
+
+func main() {
+	log, err := syslog.New(syslog.LOG_INFO|syslog.LOG_USER, "gerrit-hook")
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "failed to open syslog: %s\n", err)
+	}
+
+	log.Info(fmt.Sprintf("`gerrit-hook' called with arguments: %v\n", os.Args))
+
+	cmd := path.Base(os.Args[0])
+
+	cfg, err := loadConfig()
+	if err != nil {
+		os.Exit(1)
+	}
+
+	if cmd == "patchset-created" {
+		trigger, err := triggerForPatchsetCreated()
+		if err != nil {
+			log.Crit(fmt.Sprintf("failed to create a trigger: %s", err))
+			os.Exit(1)
+		}
+		gerritHookMain(cfg, log, trigger)
+	} else {
+		log.Info(fmt.Sprintf("`%s' is not a supported command", cmd))
+		os.Exit(1)
+	}
+}
-- 
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