#!/usr/bin/env bash
# Run by gk-deploy.timer on Cosmos: fetches master from GitHub into the
# deploy-only clone and, when it has moved, runs deploy.sh on it. A commit that
# failed to deploy is not retried until master moves again (or FORCE=1).
# Pings DEPLOY_HEALTHCHECK_URL from the stack's .env when set. See docs/deploy.md.
set -uo pipefail

STACK="${GK_STACK_DIR:-/home/greg/homelab/gregkilmer}"
export GK_STACK_DIR="$STACK"
cd "$(dirname "$0")/.."

hc="$(grep -E '^DEPLOY_HEALTHCHECK_URL=' "$STACK/.env" 2>/dev/null | cut -d= -f2- || true)"
ping() { [ -n "$hc" ] && curl -fsS -m 10 --retry 3 "$hc$1" >/dev/null 2>&1 || true; }

if ! git fetch --quiet origin master; then
  echo "Could not fetch from GitHub"
  ping /fail
  exit 1
fi
target="$(git rev-parse --short=12 origin/master)"
running="$(grep -E '^GK_TAG=' "$STACK/.env" 2>/dev/null | cut -d= -f2- || true)"
failed="$(cat "$STACK/.failed-tag" 2>/dev/null || true)"

if [ "$target" = "$running" ] && [ "${FORCE:-}" != "1" ]; then
  ping ""
  exit 0
fi
if [ "$target" = "$failed" ] && [ "${FORCE:-}" != "1" ]; then
  echo "$target failed to deploy before; waiting for a new commit (FORCE=1 to retry)"
  ping /fail
  exit 0
fi

# The clone is for deploys only, so it always matches master exactly.
git reset --quiet --hard origin/master
git clean -fdq

ping /start
if ./deploy/deploy.sh; then
  rm -f "$STACK/.failed-tag"
  ping ""
else
  echo "$target" > "$STACK/.failed-tag"
  ping /fail
  exit 1
fi