check.sh

#!/bin/sh

# check.sh origin
#
# This will fetch commits from origin, and then display the log of
# changes from origin back to when it first deviated from the current
# branch.

if [ -z "$1" ]
then
    echo "usage: check <remote> [remotebranch]"
    echo
    echo "Possible values for remote:"
    echo
    git remote | sed 's/^/  /'
    exit 1
fi

REMOTE="$1"

if [ -z "$2" ]
then
    REMOTEBRANCH="master"
else
    REMOTEBRANCH="$2"
fi

git fetch "$REMOTE"

CURRENT=$(git rev-parse HEAD)
BASE=$(git merge-base "$REMOTE/$REMOTEBRANCH" HEAD)

if [ "$CURRENT" = "$BASE" ]
then
    echo "No new changes on $REMOTE/$REMOTEBRANCH"
else
    git log $BASE..$REMOTE/$REMOTEBRANCH
fi