Post receive publishing hook

post-receive

#!/bin/bash
#
# Hook to copy the contents of a static blog generator to its final location. 
# Publishing is now a matter of 'git push blog'

set -e

read oldrev newrev refname
if [ $refname = refs/heads/master ]; then
    rev=$(echo $newrev | cut -c1-7)
    if [ -e /srv/blog/$rev ]; then
        echo "Already published"
        exit 0
    fi

    # Output is where the blog generator stores output. Copy it to a per-push
    # directory and 'activate' it by pointing a symlink.
    git archive HEAD:output/ --prefix $rev/ | (cd /srv/blog && tar -x)
    chmod -R g+w /srv/blog/$rev
    ln -snf $rev /srv/blog/current
    echo "Published blog on http://blog......com"
fi