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#!/usr/bin/env bash
set -euo pipefail
ROOT="$(git rev-parse --show-toplevel)"
cd "$ROOT"
REMOTE="${REMOTE:-origin}"
BASE_BRANCH="${BASE_BRANCH:-main}"
UPDATE_BRANCH="${UPDATE_BRANCH:-chore/update-subtrees}"
SUBTREES_FILE="${SUBTREES_FILE:-.github/subtrees.txt}"
GIT_USER_NAME="${GIT_USER_NAME:-YongDo-Hyun}"
GIT_USER_EMAIL="${GIT_USER_EMAIL:-froster12@naver.com}"
git config user.name "$GIT_USER_NAME"
git config user.email "$GIT_USER_EMAIL"
if [ ! -f "$SUBTREES_FILE" ]; then
echo "Missing $SUBTREES_FILE"
exit 1
fi
git fetch "$REMOTE" "$BASE_BRANCH"
git switch -C "$UPDATE_BRANCH" "$REMOTE/$BASE_BRANCH"
while read -r name path repo branch; do
[ -z "${name:-}" ] && continue
case "$name" in
\#*) continue ;;
esac
if [ -z "${branch:-}" ]; then
branch="main"
fi
# LLVM needs --squash due to its massive unrelated history
squash_flag=""
if [ "$name" = "llvm" ]; then
squash_flag="--squash"
fi
echo "Updating $name ($path) from $repo ($branch)${squash_flag:+ [squash]}"
if [ -d "$path" ]; then
git subtree pull --prefix="$path" "$repo" "$branch" $squash_flag -m "chore(subtrees): update $name"
else
git subtree add --prefix="$path" "$repo" "$branch" $squash_flag -m "chore(subtrees): add $name"
fi
done < "$SUBTREES_FILE"
if git diff --quiet "$REMOTE/$BASE_BRANCH"..HEAD --; then
echo "No subtree changes detected; not pushing."
exit 0
fi
git push "$REMOTE" "$UPDATE_BRANCH"
echo "Pushed updates to $REMOTE/$UPDATE_BRANCH"
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