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#!/usr/bin/env bash
set -ex
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'"
ACTUAL=$(git ls-remote "$REPO" "$COMMIT" | cut -c 1-40 -)
if [ -z "$ACTUAL" ]; then
# Use this directly on the hope that it works.
ACTUAL="$COMMIT"
fi
echo "Using commit hash '$ACTUAL'"
if [ -f "$DIR"/.git-copy ]; then
CURRENT=$(cat "$DIR"/.git-copy)
if [ "$CURRENT" = "$ACTUAL" ]; then
echo "Up to date."
exit
fi
fi
rm -rf "$DIR"
git --version
git init -q "$DIR"
git -C "$DIR" pull -q --depth=1 "$REPO" "$ACTUAL"
git -C "$DIR" rev-parse --verify HEAD > "$DIR"/.git-copy
rm -rf "$DIR"/.git
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