How to build a git polling build bot?

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How can a little cron, bash + make based script (e.g. much smaller and less robust than, for example, Hudson) build-bot poll a git repo and detect if it should build now - e.g. if in its periodic pull from the remote git repo, it has retrieved new code?

Currently, it looks like this:

git fetch  > build_log.txt 2>&1
if [ $? -eq 0 ]
then
  echo "Fetch from git done";
  git merge FETCH_HEAD >> build_log.txt 2>&1 ;
  if [ $? -eq 0 ]
  then
    echo "Merge via git done"; ...
    # builds unconditionally at the moment
  fi
fi

If nothing was fetched, then "get fetch" will output no lines, so just check for zero filesize on build_log.txt:

git fetch > build_log.txt 2>&1
if [ -s build_log.txt ]
then
   # build
fi

2.5.3. Change Sources and Changes — Buildbot latest documentation, These parameters collectively specify a set of sources from which a build may be performed. GitHubPullrequestPoller (polling GitHub API for pull requests). GitHub is a great platform for collaborating with your team members. You can take it to the next level by creating custom GitHub bots. By delegating some of the chores to a bot, you get to spend

You can record the tip of your branch to build between polls, and build whenever the the tip changes–that is, when the branch has been changed.

git rev-parse <branch_name>

Will retrieve the sha1 of the latest commit in the branch. Compare the output of the command with the stored output, and when it changes:

  1. update the stored sha1
  2. perform the build

This lets you target specific branches and only build when that branch changes. Otherwise, if you want to build whenever any branch changes you can just check that the output of git fetch is empty (when there are no updates, git fetch returns nothing).

Here's a version of your script that only builds when master changes (so that changes to experimental branches don't trigger new builds of master if it hasn't changed):

if [ ! -f prev_head ]; # initialize if this is the 1st poll
then
  git rev-parse master > prev_head
fi
# fetch & merge, then inspect head
git fetch  > build_log.txt 2>&1
if [ $? -eq 0 ]
then
  echo "Fetch from git done";
  git merge FETCH_HEAD >> build_log.txt 2>&1 ;
  git rev-parse master > latest_head
  if ! diff latest_head prev_head > /dev/null ;
  then
    echo "Merge via git done"; ...
    cat latest_head > prev_head # update stored HEAD
    # there has been a change, build
  fi
fi

GitHub Pull Request Builder, If the build fails for other various reasons you can rebuild. "retest this please" to start a new build. Installation: I recommend to create GitHub 'bot'� The build process is also pushing commits back to the repository, which is the same user I'm ignoring in the "Polling ignores commits from certain users". What happens is that after a build has finished, and the Jenkins server has pushed code back to the repo, the Git Poll Log still shows that a new build should be triggered:

If you have control over the remote repo, you might consider doing it via hooks instead of polling. That way your script only gets called when there is something new to build.

Apache Infrastructure Team: Entries tagged [builds], GitHub pull request builds now available on builds.apache.org This is done using the Jenkins Enterprise GitHub pull request builder plugin, generously A summary of just some of the things the ASF Buildbot can do for your project:. polling-bot-4000 has one repository available. Follow their code on GitHub.

You can also target a specific branch without maintaining the most recent head or using a temporary file:

if [[ $(git fetch 2>&1 | grep master) ]]; then 
  # build 
fi

Change Sources — Buildbot 0.8.6p1-1 documentation, PBChangeSource (listening for connections from contrib/git_buildbot.py run in GitPoller (polling a remote git repository); GoogleCodeAtomPoller (polling the The recommended way to install the buildbot is to create a dedicated account for � For each approved merge request, the bot will create a copy of the master branch with the proposed code change on top of it, and then run the tests. If the build passes, the master branch can be automatically fast-forwarded to the state in the temporary branch, and then the next merge request in the build queue will go through the same process.

buildbot/buildbot_travis: Adaptors to make Buildbot more , Buildbot Nine UI Plugin. buildbot_travis is configurable via the web UI. You can edit the project list, environment variables, not_important files, deployment� Learn how to build your amazingly cute Build-a-Bot Bunny, Dino or Fox with this how to video!

GitHub - http://mediasdk.intel.com/buildbot/, sudo pip3 install buildbot-worker==1.8.0 sudo pip3 install gitpython==2.1.5 login once with your infrastructure credentials (otherwise polling will NOT work). Build features fast. Ship them. That's what we try to do at GitHub. Our process is the anti-process: what's the minimum overhead we can put up with to keep our code quality high, all while building features *as quickly as possible*? It's not just features, either: faster development means happier developers.

Repository triggers the build when changes are committed , Using the source repository to trigger the build of a plan is one of the available If changes are found, Bamboo triggers a build. For Git, click here to expand. Displays link to invite Kupo Bot to a server guildinfo Displays information about the current server serverinfo modmail openticket <message> Opens a modmail ticket. Make sure the server you are on is configured for this first. modmail reply <ticketid> <message> Replies to a ticket. Must be issued to Kupo Bot via DMs rules

Comments
  • This solution is the most succinct for the special case of single branch remotes. However, this will not do what you want if another branch changes on the remote. Fetch will output any new branches available, and not track a particular branch.
  • Thats just great! Thank you!
  • But you have a typo: Should be if ! diff latest_head prev_head - not "lastest".
  • Thanks for the catch @Experience -- answer edited to fix the variable name.