poll2build.sh

poll2build.sh

#!/bin/sh

# lockfile for script
LOCKFILE=/var/lock/poll2build.pid

# check lock file
[ -f $LOCKFILE ] && echo "script already running @ `cat /var/lock/poll2build.pid`" && exit 0;

# trap for cleanup lock file
trap "{ rm -f $LOCKFILE; exit 255; }" EXIT INT

# put pid in lock file
echo "$$" > /var/lock/poll2build.pid

# info
echo "poll2build `date`"

# go to build directory
cd $1

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
        bash ./bin/install
        # there has been a change, build
    fi
fi