gitcmp

#!/bin/bash
# 
#  NAME
#    gitcmp   
#
#  SYNOPSIS
#    gitcmp dir [branch-name]
#
#  DESCRIPTION
#    Check if the local head and the remote head refers to the same commit revision.
#    It prints 0 when both are the same, otherwise print 1.
#
#  EXIT STATUS
#    0    SUCCESS
#    1    FAIL

LOCAL_HEAD=
REMOTE_HEAD=
CURRENT_BRANCH=
TARGET_BRANCH=

if [ $# -lt 1 -o $# -gt 2 ]; then
    echo 'Usage: gitcmp dir [branch-name]'
    exit 1
fi

cd $1
if [ $? -gt 0 ]; then
    exit 1
fi

git status > /dev/null
if [ $? -gt 0 ]; then
    exit 1
fi

CURRENT_BRANCH=`git branch --no-color | grep '^\*'`    
TARGET_BRANCH=${2:-master}

git checkout "$TARGET_BRANCH" > /dev/null 2>&1
if [ $? -gt 0 ]; then
    echo Error: Cannot find branch $TARGET_BRANCH 1>&2
    exit 1
fi

LOCAL_HEAD=`git log -1 master --format="%H"`
if [ ! $LOCAL_HEAD ]; then
    echo Error: Cannot detect local HEAD. 1>&2
    exit 1
fi

REMOTE_HEAD=`git ls-remote origin refs/heads/master | awk '{print $1}'`
if [ ! $REMOTE_HEAD ]; then
    echo Error: Cannot detect remote HEAD. 1>&2
    exit 1
fi

echo "Local  - $LOCAL_HEAD" 1>&2
echo "Remote - $REMOTE_HEAD" 1>&2

if [ ! "$LOCAL_HEAD" = "$REMOTE_HEAD" ]; then
    echo 1
else
    echo 0 
fi