Initial commit on Forgejo

Fresh repository history for elektrine/tarakan hosted at
https://git.elektrine.com/elektrine/tarakan.

scripts/deploy/backup.sh

@@ -0,0 +1,110 @@
+#!/usr/bin/env bash
+# Dump Postgres and hosted bare repos under APP_DIR/backups.
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
+APP_DIR="${APP_DIR:-/opt/tarakan}"
+if [[ -d "$APP_DIR/scripts/deploy" ]]; then
+  :
+elif [[ -d "$ROOT_DIR/scripts/deploy" ]]; then
+  APP_DIR="$ROOT_DIR"
+fi
+
+BACKUP_DIR="${BACKUP_DIR:-$APP_DIR/backups}"
+RETENTION_DAYS="${RETENTION_DAYS:-7}"
+COMPOSE_FILE="${COMPOSE_FILE:-$APP_DIR/deploy/docker/compose.yml}"
+
+cd "$APP_DIR"
+# Backups are shared only between the service account and the deployment
+# account through the private linuxuser group.
+umask 007
+
+set -a
+# shellcheck disable=SC1091
+. "$APP_DIR/.env"
+set +a
+
+mkdir -p "$BACKUP_DIR"
+test -f "$COMPOSE_FILE"
+
+# The systemd timer and a deployment can request a backup at the same time.
+exec 8> "$BACKUP_DIR/.backup.lock"
+flock 8
+
+timestamp="$(date -u +%Y%m%dT%H%M%S%NZ)"
+partial="$BACKUP_DIR/.backup-$timestamp.partial"
+complete="$BACKUP_DIR/backup-$timestamp"
+
+rm -rf "$partial"
+mkdir "$partial"
+
+cleanup() {
+  rm -rf "$partial"
+}
+trap cleanup EXIT HUP INT TERM
+
+compose() {
+  docker compose \
+    --project-directory "$APP_DIR" \
+    -f "$COMPOSE_FILE" \
+    --env-file "$APP_DIR/.env" \
+    "$@"
+}
+
+compose exec -T db pg_dump \
+  --username "$POSTGRES_USER" \
+  --dbname "${POSTGRES_DB:-tarakan}" \
+  --format custom \
+  --compress 6 \
+  > "$partial/database.dump"
+
+compose exec -T db pg_restore --list \
+  < "$partial/database.dump" \
+  > /dev/null
+
+compose exec -T app tar \
+  --create \
+  --gzip \
+  --file - \
+  --directory /app/storage/hosted \
+  . \
+  > "$partial/hosted.tar.gz"
+
+tar --list --gzip --file "$partial/hosted.tar.gz" > /dev/null
+
+artifacts=(database.dump hosted.tar.gz)
+
+# The SSH host key is a few kilobytes and cannot be regenerated: a new one is
+# indistinguishable from a man-in-the-middle to every client that has already
+# connected. The directory is empty until git-over-SSH is first enabled, and
+# the guard also covers images built before it existed.
+if compose exec -T app test -d /app/storage/ssh; then
+  compose exec -T app tar \
+    --create \
+    --gzip \
+    --file - \
+    --directory /app/storage/ssh \
+    . \
+    > "$partial/ssh.tar.gz"
+
+  tar --list --gzip --file "$partial/ssh.tar.gz" > /dev/null
+  artifacts+=(ssh.tar.gz)
+fi
+
+(
+  cd "$partial"
+  sha256sum "${artifacts[@]}" > SHA256SUMS
+)
+
+mv "$partial" "$complete"
+trap - EXIT HUP INT TERM
+
+find "$BACKUP_DIR" \
+  -mindepth 1 \
+  -maxdepth 1 \
+  -type d \
+  -name 'backup-*' \
+  -mtime "+$RETENTION_DAYS" \
+  -exec rm -rf -- {} +
+
+printf 'Created %s\n' "$complete"