Script to update git repos under directory

git-updater.sh

#!/bin/bash

# GitSync
#
# Syncs all remotely-tracked branches on a git repo passed as first argument ($1). It also pulls any new branches
# and tags attached to the repo.
#
# $1 - The dir to check
#
GitSync()
{
    # Check if $1 is a git repository
    stat "$1" > /dev/null || return 1;
    cd $1; echo "Checking $PWD...";
    git status --porcelain || return 1; # A fatal error if $PWD is not a git repo

    local MESSAGE=""

    # Use `git fetch` to fetch all updates across branches from all remotes. This will also fetch any NEW branches from the remote.
    # Use --tags to fetch any additional tags not associated with these branches.
    # Use --prune to remove local branches no longer on remote
    git fetch --tags --prune

    # Loop through all local remote-tracking branches and count how many commits differ.
    # If required, merge fast-forward changes into branch
    declare -a LOCAL_BRANCHES=$(git branch -l | cut -c3- | tr "\n" " ")
    for BRANCH in ${LOCAL_BRANCHES[*]}; do

        # If a local branch does not track a remote, skip it
        local REMOTE_BRANCH=$(git rev-parse --abbrev-ref --symbolic-full-name $BRANCH@{u}) || continue;
        local REMOTE_COMMITS=$(git log $BRANCH..$REMOTE_BRANCH --oneline | wc -l) # Remote commits not in my local
        local LOCAL_COMMITS=$(git log $REMOTE_BRANCH..$BRANCH --oneline | wc -l) # Local commits not pushed to remote
        local CURR_BRANCH=$(git branch | grep '*' | cut -c3-) # Check the current branch at the last minute.

        if [ $REMOTE_COMMITS != "0" ]; then
            # If on a checked-out branch, only pull if all there are no uncomitted local changes. Skip otherwise
            # For other branches, merge remote changes
            if [ "$CURR_BRANCH" = "$BRANCH" ]; then
                if [ "$(git status --porcelain)" = "" ]; then
                    git pull
                fi
            else
                git fetch origin $BRANCH:$BRANCH
            fi

            MESSAGE+="$REMOTE_COMMITS new commits from '$REMOTE_BRANCH'.\n"
        fi
    done

    # If there were any updates, notify the user. Include the latest commit on the current branch
    if [ "$MESSAGE" != "" ]; then
        MESSAGE+="\nLatest commit on '$(git rev-parse --abbrev-ref HEAD)'\n"$(git log --format=format:"%h by %an, %ar%n'%s'%n" -n 1)
        echo $MESSAGE
    fi
}

if [[ $# -lt 1 ]];
then
    echo "Usage: $0 DIR";
    echo "Synchronizes git repos under 'DIR'.";
    exit 1;
fi

DIR="$1"

find $DIR -maxdepth 1 -type d ! -path $DIR | while read d; do
    GitSync $d
    chown -R mark:mark $d &>/dev/null
done