Jesse_Chen
172 lines
6.8 KiB
Bash
Executable File
172 lines
6.8 KiB
Bash
Executable File
#!/usr/bin/env bash
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set -euo pipefail
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set +x
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umask 077
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: "${DEPLOY_PATH:?DEPLOY_PATH is required}"
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: "${RECOVERY_RUN_ID:?RECOVERY_RUN_ID is required}"
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[ "$DEPLOY_PATH" = "/opt/jyotisha-production" ] || {
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echo "unexpected production path" >&2
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exit 1
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}
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[[ "$RECOVERY_RUN_ID" =~ ^[0-9]+$ ]] || {
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echo "recovery run id must be numeric" >&2
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exit 1
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}
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state_directory="$DEPLOY_PATH/.state"
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backup_directory="$DEPLOY_PATH/backups"
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environment_file="$DEPLOY_PATH/.env.production.database"
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lock_file="$state_directory/mutation.lock"
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[ -f "$environment_file" ] && [ ! -L "$environment_file" ] || {
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echo "production database environment file is missing or unsafe" >&2
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exit 1
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}
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for directory in "$state_directory" "$backup_directory"; do
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if [ -e "$directory" ]; then
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[ -d "$directory" ] && [ ! -L "$directory" ] || {
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echo "production state or backup directory is unsafe" >&2
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exit 1
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}
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fi
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done
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install -d -m 700 "$state_directory" "$backup_directory"
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deployment_uid="$(id -u)"
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deployment_gid="$(id -g)"
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ownership_mounts=(
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--volume "$state_directory:$state_directory"
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--volume "$backup_directory:$backup_directory"
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)
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ownership_targets=()
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if [ -e "$lock_file" ]; then
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[ -f "$lock_file" ] && [ ! -L "$lock_file" ] || {
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echo "production mutation lock is unsafe" >&2
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exit 1
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}
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ownership_lock_target="/mutation.lock"
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ownership_mounts+=(--mount "type=bind,src=$lock_file,dst=$ownership_lock_target")
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ownership_targets+=("$ownership_lock_target")
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fi
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ownership_targets+=("$state_directory" "$backup_directory")
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mapfile -t postgres_containers < <(
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sudo -n docker ps -q \
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--filter 'label=com.docker.compose.project=jyotisha-production' \
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--filter 'label=com.docker.compose.service=postgres'
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)
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[ "${#postgres_containers[@]}" -eq 1 ] || {
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echo "expected exactly one running production PostgreSQL container" >&2
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exit 1
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}
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postgres_container="${postgres_containers[0]}"
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ownership_image="$(sudo -n docker inspect --format '{{.Image}}' "$postgres_container")"
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[[ "$ownership_image" =~ ^sha256:[0-9a-f]{64}$ ]] || {
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echo "production PostgreSQL image identity is unsafe" >&2
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exit 1
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}
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sudo -n docker run --rm --pull never --network none --read-only --user 0:0 \
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--cap-drop ALL --cap-add CHOWN --security-opt no-new-privileges \
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"${ownership_mounts[@]}" \
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--entrypoint chown "$ownership_image" \
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"$deployment_uid:$deployment_gid" "${ownership_targets[@]}"
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chmod 700 "$state_directory" "$backup_directory"
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if [ -e "$lock_file" ]; then
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chmod 600 "$lock_file"
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fi
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exec 9>"$lock_file"
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flock -n 9 || {
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echo "another production mutation holds the host lock" >&2
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exit 75
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}
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set -a
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# shellcheck disable=SC1090
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. "$environment_file"
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set +a
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: "${POSTGRES_DB:?}" "${POSTGRES_USER:?}" "${POSTGRES_PASSWORD:?}" "${PRODUCTION_BACKUP_ENCRYPTION_KEY:?}"
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usage_percent="$(df -Pk "$backup_directory" | awk 'NR == 2 {gsub(/%/, "", $5); print $5}')"
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[[ "$usage_percent" =~ ^[0-9]+$ ]] && (( usage_percent < 70 )) || {
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echo "production backup disk usage must remain below 70 percent" >&2
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exit 1
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}
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created_compact="$(date -u +%Y%m%dT%H%M%SZ)"
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created_at="$(date -u +%Y-%m-%dT%H:%M:%SZ)"
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backup_basename="production-pre-migration-${created_compact}.dump.enc"
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backup_partial="$backup_directory/.${backup_basename}.$$.partial"
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backup_file="$backup_directory/$backup_basename"
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restore_database="restore_verify_${created_compact,,}"
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restore_database="${restore_database//[^a-z0-9_]/_}"
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cleanup() {
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rm -f -- "$backup_partial"
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sudo -n docker exec -e PGPASSWORD="$POSTGRES_PASSWORD" "$postgres_container" \
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psql -U "$POSTGRES_USER" -d postgres -v ON_ERROR_STOP=1 \
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-c "DROP DATABASE IF EXISTS \"$restore_database\" WITH (FORCE);" >/dev/null 2>&1 || true
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}
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trap cleanup EXIT HUP INT TERM
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sudo -n docker exec -e PGPASSWORD="$POSTGRES_PASSWORD" "$postgres_container" \
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pg_dump -U "$POSTGRES_USER" -d "$POSTGRES_DB" --format=custom --no-owner --no-acl |
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openssl enc -aes-256-cbc -salt -pbkdf2 \
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-pass env:PRODUCTION_BACKUP_ENCRYPTION_KEY >"$backup_partial"
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[ -s "$backup_partial" ]
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chmod 600 "$backup_partial"
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mv "$backup_partial" "$backup_file"
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backup_sha256="$(sha256sum "$backup_file" | awk '{print $1}')"
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[[ "$backup_sha256" =~ ^[0-9a-f]{64}$ ]]
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sudo -n docker exec -e PGPASSWORD="$POSTGRES_PASSWORD" "$postgres_container" \
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psql -U "$POSTGRES_USER" -d postgres -v ON_ERROR_STOP=1 \
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-c "CREATE DATABASE \"$restore_database\";" >/dev/null
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openssl enc -d -aes-256-cbc -pbkdf2 \
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-pass env:PRODUCTION_BACKUP_ENCRYPTION_KEY -in "$backup_file" |
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sudo -n docker exec -i -e PGPASSWORD="$POSTGRES_PASSWORD" "$postgres_container" \
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pg_restore -U "$POSTGRES_USER" -d "$restore_database" \
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--no-owner --no-acl --exit-on-error
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counts="$({
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sudo -n docker exec -e PGPASSWORD="$POSTGRES_PASSWORD" "$postgres_container" \
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psql -U "$POSTGRES_USER" -d "$restore_database" -At -F '|' -v ON_ERROR_STOP=1 -c \
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"SELECT
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(SELECT count(*) FROM identity.users),
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(SELECT count(*) FROM public.profiles),
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(SELECT count(*) FROM public.credit_transactions),
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(SELECT count(*) FROM information_schema.tables WHERE table_schema = 'public');"
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} | tail -n 1)"
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IFS='|' read -r identity_users profiles credit_transactions public_tables <<<"$counts"
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for value in "$identity_users" "$profiles" "$credit_transactions" "$public_tables"; do
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[[ "$value" =~ ^[0-9]+$ ]] || {
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echo "restore verification returned an invalid count" >&2
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exit 1
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}
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done
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sudo -n docker exec -e PGPASSWORD="$POSTGRES_PASSWORD" "$postgres_container" \
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psql -U "$POSTGRES_USER" -d postgres -v ON_ERROR_STOP=1 \
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-c "DROP DATABASE \"$restore_database\" WITH (FORCE);" >/dev/null
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verified_at="$(date -u +%Y-%m-%dT%H:%M:%SZ)"
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trap - EXIT HUP INT TERM
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verify_basename="${backup_basename%.dump.enc}-restore-verify.json"
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verify_file="$backup_directory/$verify_basename"
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printf '{\n "mode": "restore_verify",\n "ok": true,\n "backup": "%s",\n "sha256": "%s",\n "created_at": "%s",\n "verified_at": "%s",\n "restore_database_removed": true,\n "checks": {"identity_users": %s, "profiles": %s, "credit_transactions": %s, "public_tables": %s}\n}\n' \
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"$backup_basename" "$backup_sha256" "$created_at" "$verified_at" \
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"$identity_users" "$profiles" "$credit_transactions" "$public_tables" >"$verify_file"
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chmod 600 "$verify_file"
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recovery_reference="gitea-actions-run-${RECOVERY_RUN_ID}/${backup_basename}"
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state_tmp="$state_directory/recovery-baseline.env.tmp.$$"
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printf 'RECOVERY_REFERENCE=%s\nRECOVERY_CREATED_AT=%s\nRECOVERY_SHA256=%s\nRESTORE_VERIFIED=true\nVERIFY_FILE=%s\n' \
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"$recovery_reference" "$created_at" "$backup_sha256" "$verify_basename" >"$state_tmp"
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chmod 600 "$state_tmp"
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mv "$state_tmp" "$state_directory/recovery-baseline.env"
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printf 'RECOVERY_REFERENCE=%s\nRECOVERY_CREATED_AT=%s\nRECOVERY_VERIFIED_AT=%s\nRECOVERY_SHA256=%s\nRESTORE_VERIFIED=true\nBACKUP_BASENAME=%s\nVERIFY_BASENAME=%s\n' \
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"$recovery_reference" "$created_at" "$verified_at" "$backup_sha256" \
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"$backup_basename" "$verify_basename"
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