#!/usr/bin/env bash
# post-receive hook for meru's homepage.git bare repo.
# Deploys jayrup.me on every push to main, using the pushed deploy-docker.sh.
#
# Install on meru (one-time):
#   cp hooks/post-receive ~/projects/homepage.git/hooks/post-receive
#   chmod +x ~/projects/homepage.git/hooks/post-receive
# Also authorize meru's SSH key on nandi (jayrup@jayrup.me ~/.ssh/authorized_keys).
#
# Log: /tmp/homepage-deploy.log — also echoed to the pusher (tee).
set -uo pipefail

# Serialize concurrent pushes (flock from util-linux)
exec 9>/tmp/homepage-deploy.lock
flock 9

LOG=/tmp/homepage-deploy.log
exec > >(tee -a "$LOG") 2>&1
echo "=== post-receive $(date -u +%Y-%m-%dT%H:%M:%SZ) ==="

BARE_DIR="$(cd "$(dirname "$0")/.." && pwd)"
BUILD_DIR="/tmp/homepage-build"
rm -rf "$BUILD_DIR"
mkdir -p "$BUILD_DIR"

DEPLOYED=0
while read oldrev newrev ref; do
    case "$ref" in
        refs/heads/main)
            OLD_SHA="$(git --git-dir="$BARE_DIR" rev-parse --short "$oldrev")"
            NEW_SHA="$(git --git-dir="$BARE_DIR" rev-parse --short "$newrev")"
            echo ">> push to main: $OLD_SHA..$NEW_SHA"
            # Snapshot the pushed tree (no .git, exact commit)
            git --git-dir="$BARE_DIR" archive "$newrev" | tar -x -C "$BUILD_DIR"
            bash "$BUILD_DIR/deploy-docker.sh" "$BUILD_DIR" "$NEW_SHA"
            DEPLOYED=1
            ;;
        *)
            echo ">> skipped $ref (only refs/heads/main deploys)"
            ;;
    esac
done

[ "$DEPLOYED" -eq 1 ] && echo "=== hook done OK ===" || echo "=== nothing deployed ==="