Automated deployments are great, simply because you can spend more time developing your app and less time following tedious, repetitive tasks.
They also minimize the human factor of the whole processes, so it’s more predictable, reliable and error-free.
Thanks to git hooks, automating your deployment process becomes an easy task. Let’s see how it’s done.
I assume you already have a bare git repository on the server which looks similar to this:
branches config description HEAD hooks info objects refs
We are going to create a
post-receive hook in the
hooks directory. This server-side hook is called after the entire push process is completed.
The idea is to pull the contents of a specific branch into a working directory on the server and deploy the application from there. The steps you want to execute after
post-receive is triggered are the following:
- check if push occurred on a specific branch
- pull the same branch to the server-side working directory
- start the deployment in the same directory
Here is how our
post-receive hook should look like:
#!/bin/bash # branch to watch for push DEPLOYMENT_BRANCH=deploy # server-side working directory WORKING_DIR=/home/akoskm/deploy/akoskm.github.io while read oldrev newrev refname do # there can be multiple branches but we're only interested in deploy branch=$(git rev-parse --symbolic --abbrev-ref $refname) if [ "$DEPLOYMENT_BRANCH" == "$branch" ]; then echo "**** pulling changes from $branch ****" # change directory to the working copy cd $WORKING_DIR unset GIT_DIR git pull origin $DEPLOYMENT_BRANCH # at this point you have the latest source in WORKING_DIR. # time to start your build process and deployment scripts # grunt, for instance grunt production fi done
The script must be executable so don’t forget adding
chmod +x post-receive
Let’s test it:
$ git push origin deploy Counting objects: 7, done. Writing objects: 100% (3/3), 241 bytes | 0 bytes/s, done. Total 3 (delta 0), reused 0 (delta 0) remote: **** pulling changes from deploy **** remote: From /home/akoskm/akoskm.github.io remote: * branch deploy -> FETCH_HEAD remote: ab96f0e..bf21a7f deploy -> origin/deploy remote: Updating ab96f0e..bf21a7f remote: Fast-forward remote: foo | 2 +- remote: 1 file changed, 1 insertion(+), 1 deletion(-) To /home/akoskm/akoskm.github.io 212fc95..bf21a7f deploy -> deploy
origin triggered the
post-receive hook and the part specific to
Run through this checklist before testing your hook:
- make sure the server-side working directory exists and you have the required permission to execute your deployment scripts there
post-receiveis executable (
- before pushing check that you’re on the right branch (
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