bot no longer autostarts CI?

[richardlau]

Opened a new PR (nodejs/node#28076) an hour ago and the bot hasn't autostarted a lite CI run as expected.

[phillipj]

Thanks for reporting!

You're definitively onto something, seeing this in the logs:

19:38:19.872Z DEBUG bot: Triggering Jenkins build (req_id=78c9fb30-87c9-11e9-88d8-ed216d688228, pr=nodejs/node/#28078, action=pull_request.opened)
19:38:20.366Z DEBUG bot: checking out origin/v7.x-staging... (req_id=78c9fb30-87c9-11e9-88d8-ed216d688228, pr=nodejs/node/#28078, action=pull_request.opened)
19:38:20.385Z DEBUG bot: (req_id=78c9fb30-87c9-11e9-88d8-ed216d688228, pr=nodejs/node/#28078, action=pull_request.opened)
    error: pathspec 'origin/v7.x-staging' did not match any file(s) known to git.

19:38:20.386Z DEBUG bot: backport to 7 failed (req_id=78c9fb30-87c9-11e9-88d8-ed216d688228, pr=nodejs/node/#28078, action=pull_request.opened)
19:38:20.387Z DEBUG bot: Should have added (but temporary disabled): dont-land-on-v7.x (req_id=78c9fb30-87c9-11e9-88d8-ed216d688228, pr=nodejs/node/#28078, action=pull_request.opened)
19:38:20.387Z DEBUG bot: processing a new backport to v6 (req_id=78c9fb30-87c9-11e9-88d8-ed216d688228, pr=nodejs/node/#28078, action=pull_request.opened)
19:38:20.387Z DEBUG bot: aborting any previous backport attempt... (req_id=78c9fb30-87c9-11e9-88d8-ed216d688228, pr=nodejs/node/#28078, action=pull_request.opened)
19:38:20.405Z DEBUG bot: updating git remotes... (req_id=78c9fb30-87c9-11e9-88d8-ed216d688228, pr=nodejs/node/#28078, action=pull_request.opened)
19:38:20.423Z DEBUG bot: (req_id=78c9fb30-87c9-11e9-88d8-ed216d688228, pr=nodejs/node/#28078, action=pull_request.opened)
    Fetching origin

19:38:20.784 FATAL bot: Unchaught exception, terminating bot process immediately
    TypeError: Cannot destructure property `jobName` of 'undefined' or 'null'.
        at onBuildTriggered (/../scripts/trigger-jenkins-build.js:85:53)
        at Request.request.post [as _callback] (/home/../scripts/trigger-jenkins-build.js:70:14)
        at Request.self.callback (/home/../node_modules/request/request.js:185:22)
        at Request.emit (events.js:189:13)
        at Request.<anonymous> (/home/../node_modules/request/request.js:1161:10)
        at Request.emit (events.js:189:13)

After that, the bot process dies and starts up again few seconds later.

Not sure if all the above is related to the fatal explosion at the bottom, but sharing those logs anyway.

[sam-github]

error: pathspec 'origin/v7.x-staging' did not match any file(s) known to git.

That's my fault, I guess, though I might be triggering a bug elsewhere. I deleted the unused (I thought) staging branches, since we'll never do a v7.x release again (and can make a staging branch if we really needed it).

But, I'm a bit confused, why should @richardlau 's PR, richardlau wants to merge 1 commit into nodejs:master from richardlau:11eol, be depending on the existence of v7.x-staging?

[sam-github]

These lines are interesting, too. I suspect that the bot has no longer necessary (but still running) code that is checking whether commits cherry-pick clean onto LTS branches, except that I think we removed that feature (inability to cherrypick happens all the time, but doesn't mean they won't cherry pick when the whole branch is picked down), and we certainly don't care if commits don't pick clean onto unsupported release lines.

19:38:20.386Z DEBUG bot: backport to 7 failed (req_id=78c9fb30-87c9-11e9-88d8-ed216d688228, pr=nodejs/node/#28078, action=pull_request.opened)
19:38:20.387Z DEBUG bot: Should have added (but temporary disabled): dont-land-on-v7.x (req_id=78c9fb30-87c9-11e9-88d8-ed216d688228, pr=nodejs/node/#28078, action=pull_request.opened)
19:38:20.387Z DEBUG bot: processing a new backport to v6 (req_id=78c9fb30-87c9-11e9-88d8-ed216d688228, pr=nodejs/node/#28078, action=pull_request.opened)

I'm going to repush those staging branches, but I think this is indicative of a code cleanup needed in the bot.

[sam-github]

I pushed v6.x-staging and v7.x-staging. Perhaps the issue should be retitled?

[richardlau]

Those log lines are from https://github.com/nodejs/github-bot/blob/b6e54da9741460fd85fda1931bfb3aeaaba4fc28/scripts/attempt-backport.js. Given that it references 7, 6 and 4 which are long EOL it either needs updating or removal:

github-bot/scripts/attempt-backport.js

Lines 9 to 12 in b6e54da

	const nodeVersions = [
	{ version: 7 },
	{ version: 6, lts: true },
	{ version: 4, lts: true }

[sam-github]

probably removal, along with

github-bot/scripts/attempt-backport.js

Lines 52 to 54 in b6e54da

	for (const node of nodeVersions) {
	queueAttemptBackport(options, node.version, !!node.lts)
	}

and

github-bot/scripts/attempt-backport.js

Lines 24 to 41 in b6e54da

	// to trigger polling manually
	app.get('/attempt-backport/pr/:owner/:repo/:id', (req, res) => {
	const owner = req.params.owner
	const repo = req.params.repo
	const prId = parseInt(req.params.id, 10)
	const options = { owner, repo, prId, logger: req.log }
	if (~enabledRepos.indexOf(repo)) {
	for (const node of nodeVersions) {
	queueAttemptBackport(options, node.version, !!node.lts)
	}
	}
	if (!inProgress) processNextBackport()
	res.end()
	})
	}

and

github-bot/scripts/attempt-backport.js

Lines 73 to 153 in b6e54da

	function queueAttemptBackport (options, version, isLTS) {
	queue.push(function () {
	options.logger.debug(`processing a new backport to v${version}`)
	attemptBackport(options, version, isLTS, processNextBackport)
	})
	}
	function attemptBackport (options, version, isLTS, cb) {
	// Start
	gitAmAbort()
	function wrapCP (cmd, args, opts, callback) {
	let exited = false
	if (arguments.length === 3) {
	callback = opts
	opts = {}
	}
	opts.cwd = global._node_repo_dir
	const cp = spawn(cmd, args, opts)
	const argsString = [cmd, ...args].join(' ')
	cp.on('error', function (err) {
	debug(`child_process err: ${err}`)
	if (!exited) onError()
	})
	cp.on('exit', function (code) {
	exited = true
	if (!cb) {
	debug(`error before exit, code: ${code}, on '${argsString}'`)
	return
	} else if (code > 0) {
	debug(`exit code > 0: ${code}, on '${argsString}'`)
	onError()
	return
	}
	callback()
	})
	// Useful when debugging.
	cp.stdout.on('data', (data) => {
	options.logger.debug(data.toString())
	})
	cp.stderr.on('data', (data) => {
	options.logger.debug(data.toString())
	})
	return cp
	}
	function onError () {
	if (!cb) return
	const _cb = cb
	setImmediate(() => {
	options.logger.debug(`backport to ${version} failed`)
	if (!isLTS) {
	options.logger.debug(`Should have added (but temporary disabled): dont-land-on-v${version}.x`)
	} else {
	getBotPrLabels(options, (err, ourLabels) => {
	if (err) {
	options.logger.error(err, 'Error fetching existing bot labels')
	return
	}
	const label = `lts-watch-v${version}.x`
	if (!ourLabels.includes(label)) return
	removeLabelFromPR(options, label)
	})
	}
	setImmediate(() => {
	inProgress = false
	_cb()
	})
	})
	cb = null
	}

-- I don't think any of that is used anymore.

[richardlau]

So it looks like jobs are now attempted to start but something's still going wrong, e.g. nodejs/node#28098 (comment)

Sadly, an error occurred when I tried to trigger a build. :(

[phillipj]

With #237 rolled out, we luckily have more error details to work with:

Error: Expected 200 from Jenkins, got 403
    at Request.request.post [as _callback] (/home/.../scripts/trigger-jenkins-build.js:70:17)
    at Request.self.callback (/home/.../node_modules/request/request.js:185:22)
    at Request.emit (events.js:189:13)

[phillipj]

IIRC we've seen this happen before when changes has been made in Jenkins, including plugin upgrades, does that ring a bell to anyone in @nodejs/build?

[rvagg]

I'm not aware of anything that's changed on our end. There were some plugin security updates earlier this week but I didn't update them because they didn't seem to impact us. Maybe someone else did though. There's some updates queued right now so I've run them and restarted Jenkins. Maybe try again now to see if that's fixed anything.
@phillipj can you log more information about the failed response where you got that 403? I see it's only taking response.statusCode, the body might be informative for these situations.

[phillipj]

Thanks for the quick reply. Good point about also logging the body, snook it into master now (7ced2a7). I'll post an example later when I see this error happening again.

[phillipj]

The 403 response body consists of HTML, where the only human readable message I see is:

<h1>Access Denied</h1><p class="error">nodejs-github-bot is missing the Job/Build permission</p>

@nodejs/jenkins-admins help?

[rvagg]

sorry, I'm not sure what's up with this, the bot has this config:

JENKINS_JOB_NODE=node-test-pull-request-lite-pipeline
JENKINS_BUILD_TOKEN_NODE=xyz

in the node-test-pull-request-lite-pipeline job, it has that build token (replaced here with xyz but it's a long random string). I suppose, given that error message, that you not only need the token but also user permission.

nodejs-github-bot is only a member of the bots and automation-collaborators teams in the GitHub org and neither of these are configured in Jenkins to say that it it has "Job/Build permissions".

I'm hesitant to just add one of those teams or the user itself to Jenkins without understanding how we got here. There's 3 obvious reasons that I see:

• A Jenkins upgrade broke this permission model--perhaps, but I haven't seen evidence that it was upgraded at the time this stopped working or that Jenkins have changed anything, but someone could investigate this further i suppose, the Jenkins release notes might be the place to look.
• A change in Jenkins permissions--I can't find evidence of this and I'm fishing through config.xml history on the server. Perhaps there's something in the node-test-pull-request-lite-pipeline that I'm not seeing but I'm pretty sure it defers to global security.
• A change in team membership of nodejs-github-bot--someone with audit log access on the org (@sam-github maybe?) could look through and see what kinds of changes were made in the timeframe in question. Maybe it got removed from "collaborators"? Maybe there's some team hierarchy stuff going on here.

Aside from that 🤷‍♂