#!/usr/bin/env bash
set -Eeuo pipefail
source /opt/rust-package-builder/scripts/lib.sh

STATE_FILE="$DATA_DIR/state/last_commit"

log "checking repository"
REMOTE_SHA=$(git ls-remote "$SOURCE_REPO" "refs/heads/$SOURCE_BRANCH" | awk 'NR == 1 {print $1}')
[[ "$REMOTE_SHA" =~ ^[0-9a-fA-F]{40}$ ]] || fatal "cannot resolve branch $SOURCE_BRANCH from $SOURCE_REPO"

LAST_SHA=""
[[ -r "$STATE_FILE" ]] && LAST_SHA=$(cat "$STATE_FILE")

if [[ "$REMOTE_SHA" == "$LAST_SHA" ]]; then
    log "no changes: $REMOTE_SHA"
    exit 0
fi

log "new commit detected: $REMOTE_SHA"
/opt/rust-package-builder/scripts/build-release.sh "$REMOTE_SHA"