| #!/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'" |
| 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" = "$ACTUAL" ]; then |
| echo "Up to date." |
| exit |
| fi |
| fi |
| |
| rm -rf "$DIR" |
| git init -q "$DIR" |
| git -C "$DIR" fetch -q --depth=1 "$REPO" "$COMMIT" |
| git -C "$DIR" reset -q --hard FETCH_HEAD |
| git -C "$DIR" rev-parse --verify HEAD > "$DIR"/.git-copy |
| rm -rf "$DIR"/.git |
