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#!/usr/bin/env bash
set -e
if [ $# -lt 3 ]; then
echo "Usage: $0 <repo> <branch> <directory>" 1>&2
exit 2
fi
REPO=$1
COMMIT=$2
DIR=$3
echo "Copy '$COMMIT' from '$REPO' to '$DIR'"
if [ -f $DIR/.git-copy ]; then
CURRENT=$(cat $DIR/.git-copy)
if [ $(echo -n $COMMIT | wc -c) != "40" ]; then
# On the off chance that $COMMIT is a remote head.
ACTUAL=$(git ls-remote $REPO $COMMIT | cut -c 1-40 -)
else
ACTUAL=$COMMIT
fi
if [ "$CURRENT" = "$ACTUAL" ]; then
echo "Up to date."
exit
fi
fi
git init -q $DIR
git -C $DIR fetch -q --depth=1 $REPO $COMMIT:git-copy-tmp
git -C $DIR reset --hard git-copy-tmp
git -C $DIR rev-parse --verify HEAD > $DIR/.git-copy
rm -rf $DIR/.git
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