post-checkout and post-merge

post-checkout

#!/bin/bash

# Check if any submodule has been updated in HEAD after a merge (or
# pull) or a branch checkout. If so, ask if user wants to run
# git-submodule update.
# --Chaitanya Gupta

SCRIPT_NAME=$(basename "$0")

if [[ "$SCRIPT_NAME" = "post-checkout" && "$1" = "$2" || "$3" = "0" ]]; then
    exit 0
fi

echo "Checking if any submodules have changed..."

# Jump to the current project's root directory (the one containing
# .git/)
ROOT_DIR=$(git rev-parse --show-cdup)

SUBMODULES=$(grep path ${ROOT_DIR}.gitmodules | sed 's/^.*path = //')

# Finding the submodules that have been modified
MOD_SUBMODULES=$(git diff --name-only | grep -F "$SUBMODULES")

# If no modified submodules, exit with status code 0, else prompt the
# user and exit accordingly
if [[ -n "$MOD_SUBMODULES" ]]; then
    echo "The following submodules have been updated in HEAD:"
    echo "$MOD_SUBMODULES"
    echo -n "Run git-submodule update? [n] "
    read -n 1 reply </dev/tty
    echo
    if [[ "$reply" == "y" || "$reply" == "Y" ]]; then
        git submodule update
    fi
fi