Script that update git repositories and run make build when someone access port 1500

git-pull-webhook.sh

#!/bin/bash

PORT=1500
PROGRAM=$(readlink -f $0)
GIT=$(which git)
NCAT=$(which ncat)
MAKE=$(which make)

SLACK_URL="https://hooks.slack.com/services/XXXXXXXXX/XXXXXXXXX/XXXXXXXXXXXXXXXXXXXXXXXX"
SLACK_BOT_NAME="Tripa-Seca"
SLACK_CHANNEL="#chapolin"


REPOS=(
    "/srv/www/working_copy1"
    "/srv/www/working_copy2"
)

git_pull() {
    report="";

    for repo in "${REPOS[@]}";
    do
        gitreset=$($GIT -C $repo reset HEAD --hard 2>&1);
        gitout=$($GIT -C $repo pull --no-stat 2>&1);
        branch=$($GIT -C $repo rev-parse --abbrev-ref HEAD);
        commit=$($GIT -C $repo rev-parse --short HEAD);

        report="$report>> $repo\n";
        report="$report>> DISCARDING LOCAL CHANGES: $gitreset\n";
        report="$report============== ($branch - $commit)\n";
        report="$report$gitout\n";
        report="$report\n";

	if [[ ! "$gitout" =~ "Already up-to-date" ]] && [ -s "$repo/Makefile" ] && grep -q '^build:' "$repo/Makefile";
        then
		report="$report>> Runing make build\n--------------\n";
                build=$($MAKE -C $repo build 2>&1);
                report="$report $build"
		report="$report\n";
        fi

        echo "$branch - $commit" > $repo/src/revision.txt;
    done

    length=$(echo -e "$report" | wc -m)

    echo "HTTP/1.1 200 OK";
    echo "Content-Type: text/plain; charset=utf-8";
    echo "Content-Length: $length";
    echo "";
    echo -e "$report";

    echo -e "$report" 1>&2;

    if [ -n "$SLACK_URL" ];
    then
        curl -X POST --data-urlencode "payload={\"channel\": \"$SLACK_CHANNEL\", \"text\": \"$report\", \"username\": \"$SLACK_BOT_NAME\" }" "$SLACK_URL" 1>&2;
   fi;
}


run_server() {
    ok=1;
    while test "$ok";
    do
        $NCAT -l -p $PORT -e "$PROGRAM git_pull $1";
        ok=$?;
    done;
}

if test "$1" == "git_pull";
then
    git_pull;
else
    run_server;
fi