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#!/bin/bash
# check_source <name> <url> <refspec>
#
# Check a git source for new updates. A local cache repository is cloned if
# <name> doesn't exist. If updates are found, we attempt to checkout the
# newest version according to <refspec> (see git-for-each-ref(1)).
#
# The new (or current) git commit hash is printed to stdout. If the file tree
# is updated, this file exits non-zero.
gethash() {
git for-each-ref \
--count=1 \
--format='%(objectname)' \
--sort='-creatordate' \
"$1" #ref
}
cd '/git'
if ! [ -d "$1" ]; then
git clone "$2" "$1" >&2
touch "$1/.git/previous_hash"
touch "$1/.git/previous_slug"
fi
cd "$1"
git fetch --all --prune >&2
prev=$(cat '.git/previous_hash')
next=$(gethash "$3")
echo "$next"
if [ "$prev" != "$next" ]; then
git submodule deinit --all -f >/dev/null 2>&1
git reset . >/dev/null 2>&1
git checkout . >/dev/null 2>&1
git clean -xffd >/dev/null 2>&1
git checkout "$next" >/dev/null 2>&1
git submodule update --init --recursive >/dev/null 2>&1
exit 1
fi
exit 0
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