#!/bin/sh
# Deploys voyager 2 (branch rebuild) on homelab at one commit. Installed as
# ~/bin/deploy-usenet-rebuild (by hand: it doesn't update itself). Gitea CI
# runs it through the forced SSH command of the deploy key, as
# "deploy-rebuild <sha>" (~/bin/deploy-usenet-indexer passes that on); by
# hand: deploy-usenet-rebuild <sha>. The code comes from the Gitea repo, not
# from the CI job.
set -eu

REPO=https://gitea.exp.sforum.nl/daan/usenet-indexer.git
BRANCH=rebuild
ROOT=/mnt/bulk/usenet-rebuild
CACHE="$ROOT/.cache"
GIT="$CACHE/repo.git"

SHA="${1:-}"
case "$SHA" in
  *[!0-9a-f]* | "") echo "usage: deploy-usenet-rebuild <40-character commit sha>" >&2; exit 2 ;;
esac
[ "${#SHA}" -eq 40 ] || { echo "usage: deploy-usenet-rebuild <40-character commit sha>" >&2; exit 2; }

mkdir -p "$CACHE"
# One deploy at a time; a second one waits.
exec 9>"$CACHE/deploy.lock"
flock 9

echo "== fetching $SHA"
[ -d "$GIT" ] || git clone --quiet --bare "$REPO" "$GIT"
git -C "$GIT" fetch --quiet --prune "$REPO" '+refs/heads/*:refs/heads/*'
git -C "$GIT" cat-file -e "$SHA^{commit}"
git -C "$GIT" merge-base --is-ancestor "$SHA" "refs/heads/$BRANCH" || { echo "$SHA is not on $BRANCH" >&2; exit 2; }

STAGE=$(mktemp -d)
trap 'rm -rf "$STAGE"' EXIT
git -C "$GIT" archive "$SHA" | tar -x -C "$STAGE"
rsync -a --delete "$STAGE"/ "$ROOT/src/"
install -m 644 "$ROOT/src/deploy/compose.yaml" "$ROOT/compose.yaml"

cd "$ROOT"
echo "== building images"
docker compose build migrate edge
echo "== running migrations"
docker compose run --rm --no-deps migrate
# Only the app services, never postgres. The worker first: one holding a
# stream keeps the node API from exiting.
echo "== recreating app services"
docker compose stop edge
if [ -e "$CACHE/paused" ]; then
  # Paused for the night (~/bin/usenet-rebuild-pause.sh): the workers stay stopped, the resume starts the new build.
  echo "== paused: coordinator, prober, merger, judge, spotter, spot-inspector and edge left stopped"
  docker compose up -d --no-deps node-api web
else
  docker compose up -d --no-deps node-api web coordinator prober merger judge spotter spot-inspector
  docker compose up -d --no-deps edge
fi
echo "$SHA $(date -Is)" >> "$ROOT/deployed.log"
# The images this replaced (321 MB each; the root filesystem is the NVMe, with a 10 GB floor).
docker image prune -f --filter label=com.docker.compose.project=usenet-rebuild >/dev/null
docker compose ps --format '{{.Service}} {{.Status}}' node-api web coordinator prober merger judge spotter spot-inspector edge
echo "== deployed $SHA"