Gate restore on the dump's data revision, not the code head
A restore could load a database dump whose schema was older than the running code. The manifest stamped schemarev from the code image on disk, so the compatibility check compared the code against itself and always passed. A set captured from a database at 7d37_import_batches_and_journal restored under code at 7d41_drop_guest_tools_secrets, leaving the data behind the code: every query on a table the newer migrations touched failed with 1054 Unknown column, which surfaced as empty configuration-policy dropdowns and a failure to load data on edit PC. The authoritative signal is the alembic_version of the database that was dumped, so manifests now carry datarev alongside schemarev, backup.sh reads it from the database and warns when it has drifted from the image, and the gate asks whether the running code knows that revision. Data behind the code is allowed because it can be rolled forward; data ahead of the code is refused because it cannot. Rolling it forward has to happen somewhere with an app context. The backup sidecar is mysql plus restic plus alembic only and has no Flask, so restore.sh loads the dump and parks the run in an upgrading phase behind an .upgrade-requested sentinel rather than declaring a success it cannot verify. The api container owns the Flask CLI and already runs these exact idempotent commands on every deploy, so a finalize endpoint there runs db upgrade plus plugin upgrade-all and stamps the terminal phase. The UI drives it on seeing the upgrading phase, so recovery needs no operator intervention. The live simulation runs one codebase against itself, so its dump is always at the same revision as the code restoring it and it can never reproduce this drift. The gate therefore gets a standalone tester that builds throwaway migration chains and dumps offline, invoked as a simulation preflight. It caught a real bug in the legacy dump-parse fallback, where the revision was matched loosely enough to return the alembic_version table name instead of the value it holds.
This commit is contained in:
benjamin.baker
@@ -60,15 +60,44 @@ mysqldump \
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log "database dump written ($(du -h "${SETDIR}/db.sql.gz" | cut -f1))"
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# 2. Manifest: the schema stamp that makes a restore a checked operation.
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# Capture the revision actually applied to the DATABASE (its alembic_version),
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# not just the code head. A restore must gate on the DATA revision; stamping
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# only the code head hides an image that has outrun its own database and lets a
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# behind-schema dump restore under ahead-schema code (1054 Unknown column on
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# every affected table). Query it straight from the dumped DB.
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log "reading applied database revision (alembic_version)"
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DATAREV="$(mysql \
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--host="${MYSQL_HOST}" \
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--user="${MYSQL_USER}" \
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--password="${MYSQL_PASSWORD}" \
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--skip-column-names --batch \
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-e "SELECT version_num FROM alembic_version LIMIT 1;" \
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"${MYSQL_DATABASE}" 2>/dev/null | tr -d '\r')"
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[ -n "${DATAREV}" ] || log "WARN could not read alembic_version - datarev will be empty"
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log "writing manifest"
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python3 /opt/backup/manifest.py \
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--out "${SETDIR}/manifest.json" \
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--takenat "${STAMP}" \
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--site "${SITE}" \
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--imagetag "${SHOPDB_IMAGE_TAG:-source}" \
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--datarev "${DATAREV}" \
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--migrations /app/migrations \
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--plugins /app/plugins
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# Consistency guard: if the DATA revision does not match the CODE head, this
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# backup captures a database the running image has outrun. It is still stored
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# (losing it would be worse) but flagged loudly so a restore of it is a
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# deliberate choice, not a surprise.
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CODEREV="$(python3 -c \
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'import json,sys;print(",".join(sorted(json.load(open(sys.argv[1]))["schemarev"]["core"])))' \
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"${SETDIR}/manifest.json" 2>/dev/null || echo "")"
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if [ -n "${DATAREV}" ] && [ "${DATAREV}" != "${CODEREV}" ]; then
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log "WARN schema drift: database is at '${DATAREV}' but code head is '${CODEREV}'"
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log "WARN this DB has not run 'flask db upgrade' to the running image; restore will upgrade it"
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history_append backup warning "${SETNAME}" "Schema drift: data ${DATAREV} vs code ${CODEREV}"
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fi
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# 3. restic snapshot: db dump + instance tree + manifest, one point in time.
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# Skips gracefully when restic/repo are not configured (local-only sites).
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IS_CHECK_PASSED=false
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@@ -6,15 +6,21 @@ restore." It records, at capture time:
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- takenat : ISO-8601 UTC timestamp of the run
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- site : the site tag
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- imagetag : the app image tag that produced the data
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- schemarev : the core Alembic head revision(s) the running code is at, plus
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- schemarev : the core Alembic head revision(s) the running CODE is at, plus
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each plugin chain's heads - the versions a restore target must
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be at least, or restored rows reference columns the live schema
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has not applied yet.
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- datarev : the Alembic revision actually applied to the DATABASE that was
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dumped (its alembic_version), which is the number a restore must
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gate on. schemarev stamps the code on disk; datarev stamps the
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data in the dump. They diverge when an image is ahead of a DB
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that has not run 'flask db upgrade' yet, and that divergence is
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exactly what a code-to-code check cannot see.
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Two modes:
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--out ... write a fresh manifest for a new set
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--amend ... patch an existing manifest (used to record ischeckpassed after
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restic check runs)
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restic check runs, or to backfill datarev)
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ASCII only, no emojis - matches the repo style gate.
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"""
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@@ -79,6 +85,7 @@ def write_manifest(args):
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'site': args.site,
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'imagetag': args.imagetag,
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'schemarev': _collect_schema(args.migrations, args.plugins),
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'datarev': args.datarev or '',
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'ischeckpassed': False,
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}
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with open(args.out, 'w', encoding='utf-8') as handle:
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@@ -94,6 +101,8 @@ def amend_manifest(args):
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manifest = {}
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if args.ischeckpassed is not None:
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manifest['ischeckpassed'] = args.ischeckpassed.lower() == 'true'
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if args.datarev is not None:
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manifest['datarev'] = args.datarev
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with open(args.amend, 'w', encoding='utf-8') as handle:
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json.dump(manifest, handle, indent=2, sort_keys=True)
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return 0
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@@ -108,6 +117,7 @@ def main(argv=None):
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parser.add_argument('--imagetag', default='source')
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parser.add_argument('--migrations', default='/app/migrations')
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parser.add_argument('--plugins', default='/app/plugins')
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parser.add_argument('--datarev')
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parser.add_argument('--ischeckpassed')
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args = parser.parse_args(argv)
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@@ -27,13 +27,20 @@ SETNAME="${1:-}"
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log() { echo "[restore] $*"; }
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# On any exit, stamp the terminal phase and append a history record so the UI
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# reflects success or failure even when a step aborts early (set -e).
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RESTORE_DONE=false
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# reflects success or failure even when a step aborts early (set -e). A restore
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# is only "done" once the DATA has been upgraded to the running CODE, and that
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# upgrade runs in the Flask-capable api container, not here (this sidecar has no
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# app). So the happy path ends by handing off to the api: this script stamps an
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# 'upgrading' phase and drops an .upgrade-requested sentinel, and the api runs
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# 'flask db upgrade' + 'flask plugin upgrade-all' and writes the final 'done'.
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RESTORE_LOADED=false
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_on_exit() {
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code=$?
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if [ "${RESTORE_DONE}" = true ]; then
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status_write restore done "${SETNAME}" "Restore complete"
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history_append restore success "${SETNAME}" "Restore complete"
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if [ "${RESTORE_LOADED}" = true ]; then
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# Data is loaded; the api takes it from 'upgrading' to 'done'. Do not
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# stamp success here or the UI would call the restore complete before
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# the schema is actually brought up to code.
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status_write restore upgrading "${SETNAME}" "Upgrading restored schema to code"
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else
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status_write restore failed "${SETNAME}" "Restore failed (exit ${code})"
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history_append restore failed "${SETNAME}" "Restore failed (exit ${code})"
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@@ -59,26 +66,41 @@ if [ ! -f "${DBDUMP}" ]; then
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fi
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[ -f "${DBDUMP}" ] || die "no db.sql.gz for set ${SETNAME}"
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# Compatibility gate: the running schema must cover the set's stamped heads.
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# Compatibility gate: the restore must gate on the revision the DUMP'S DATA is
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# at (datarev), not on a code-to-code comparison. Loading data that sits at an
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# OLDER revision than the running code is fine - we upgrade it afterwards - but
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# loading data NEWER than the code (a revision the code has never heard of)
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# would leave rows referencing columns the code cannot migrate to, so that is
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# refused.
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log "checking schema compatibility"
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CURRENT_HEADS="$(python3 /opt/backup/manifest.py \
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--out /tmp/current-manifest.json \
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--migrations /app/migrations --plugins /app/plugins \
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>/dev/null 2>&1 && python3 -c \
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'import json;print(",".join(sorted(json.load(open("/tmp/current-manifest.json"))["schemarev"]["core"])))')"
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SET_HEADS="$(python3 -c \
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'import json,sys;print(",".join(sorted(json.load(open(sys.argv[1]))["schemarev"]["core"])))' \
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"${SETDIR}/manifest.json" 2>/dev/null || echo "")"
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if [ -z "${SET_HEADS}" ]; then
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die "set ${SETNAME} has no readable manifest - refusing an unverified restore"
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# The set's data revision: prefer the manifest field; for older manifests that
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# predate datarev, parse the real alembic_version straight out of the dump so a
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# legacy set is still gated on its true data, not on a code-derived stamp.
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SET_DATAREV="$(python3 -c \
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'import json,sys;print(json.load(open(sys.argv[1])).get("datarev",""))' \
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"${SETDIR}/manifest.json" 2>/dev/null || echo "")"
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if [ -z "${SET_DATAREV}" ]; then
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log "manifest has no datarev (legacy set) - reading it from the dump"
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SET_DATAREV="$(gunzip -c "${DBDUMP}" \
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| grep -A2 -i 'INSERT INTO `alembic_version`' \
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| grep -oE "'[0-9a-zA-Z_]+'" | tr -d "'" | head -1)"
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fi
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if [ "${CURRENT_HEADS}" != "${SET_HEADS}" ]; then
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log "current heads : ${CURRENT_HEADS}"
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log "set heads : ${SET_HEADS}"
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die "schema mismatch - bring code to the set's revision, run 'flask db upgrade' and 'flask plugin upgrade-all', then retry"
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if [ -z "${SET_DATAREV}" ]; then
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die "cannot determine the set's data revision - refusing an unverified restore"
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fi
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# Does the running code know this revision at all? If a migration file with that
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# revision id exists in the core chain, the code is at-or-past it (the head is
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# the tip of the same chain), so a post-load upgrade can carry the data forward.
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# If it is absent, the dump is NEWER than the code - refuse.
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if ! grep -rqE "^revision = ['\"]${SET_DATAREV}['\"]" /app/migrations/versions 2>/dev/null; then
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log "set datarev : ${SET_DATAREV}"
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die "the backup's data is at a revision this code does not have - deploy code at or past '${SET_DATAREV}' before restoring"
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fi
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log "data revision ${SET_DATAREV} is known to this code - restore may proceed"
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# Files first, then DB, so the two land together.
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if command -v restic >/dev/null 2>&1 && [ -n "${RESTIC_REPOSITORY:-}" ]; then
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status_write restore files "${SETNAME}" "Restoring instance files"
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@@ -95,6 +117,17 @@ gunzip -c "${DBDUMP}" | mysql \
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--password="${MYSQL_PASSWORD}" \
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|| die "database load failed"
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# Hand off to the api container for the schema upgrade. The dump may sit at an
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# older revision than this image (allowed and expected); without the upgrade the
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# data stays behind the code and every query on a table the newer migrations
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# changed 500s with 1054 Unknown column. This sidecar has no Flask, so it cannot
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# run 'flask db upgrade' itself - it records the intent and lets the api (which
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# owns the app context and already runs these exact idempotent commands on every
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# deploy) finalize. The api clears .upgrade-requested and stamps the final
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# 'done' once the upgrade succeeds.
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status_write restore upgrading "${SETNAME}" "Upgrading restored schema to code"
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printf '%s' "${SETNAME}" > "${BACKUPS_ROOT}/.upgrade-requested"
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log "database loaded at revision ${SET_DATAREV}; handed off to api for schema upgrade"
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rm -f "${BACKUPS_ROOT}/.restore-requested" 2>/dev/null || true
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RESTORE_DONE=true
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log "restore of ${SETNAME} complete"
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RESTORE_LOADED=true
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@@ -103,6 +103,17 @@ wait_for_phase() {
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${COMPOSE} exec -T db sh -c 'true' >/dev/null 2>&1 \
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|| die "db container not reachable - is the stack up?"
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# --- 0b. Datarev-gate preflight (external tester) --------------------------
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# This live round trip runs one codebase against itself, so it can never
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# reproduce the "data revision behind the running code" case the restore gate
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# now handles. Run the standalone datarev tester first so a pass here also
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# covers that offline contract (manifest datarev, known-vs-unknown revision
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# refusal, legacy fallback, and the api upgrade handoff).
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log "running datarev gate preflight (test-restore-datarev.sh)"
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bash "${SCRIPT_DIR}/test-restore-datarev.sh" \
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|| die "datarev gate preflight failed - see output above"
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log "datarev gate preflight passed"
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# --- 1. Backup the current state, then fingerprint the RESTORE TARGET ------
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# The restore point is the database as it existed WHEN THE DUMP RAN, not some
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# earlier moment. Live-churn tables (apitokens last-used, sessions, auditlogs)
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172
scripts/backup/test-restore-datarev.sh
Normal file
172
scripts/backup/test-restore-datarev.sh
Normal file
@@ -0,0 +1,172 @@
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#!/usr/bin/env bash
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# ShopDB restore datarev-gate tester. ***FOR DEVELOPER USE ONLY***
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#
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# WHY THIS EXISTS SEPARATELY FROM simulate-restore.sh:
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# simulate-restore.sh is a full-fidelity ROUND TRIP against a live stack: it
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# backs up, mutates, restores, and proves every table returns to backup-time
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# state. By construction it runs ONE codebase against ITSELF, so the database it
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# dumps is always at the SAME revision as the code that restores it. It can
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# therefore never exercise the case the FBJXBDB4 outage was about: a dump whose
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# DATA revision is BEHIND (or ahead of) the running CODE.
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#
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# This tester fills that gap offline. It builds throwaway migration trees and
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# fake gzipped dumps and drives the exact decision logic restore.sh uses:
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# 1. manifest.py records datarev (the DB's real alembic_version), not just the
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# code head (schemarev).
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# 2. A dump whose datarev the code KNOWS (an ancestor in the chain) is allowed
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# - the post-load upgrade rolls it forward.
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# 3. A dump whose datarev the code does NOT know (newer than this build) is
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# REFUSED - restoring it would 500 on 1054 Unknown column.
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# 4. A legacy manifest with no datarev falls back to parsing alembic_version
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# straight out of the dump.
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# 5. restore.sh hands the loaded restore off to the api via the
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# .upgrade-requested sentinel instead of marking it done in the sidecar.
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#
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# No Docker, no MySQL, no network: it is a pure logic gate test, safe to run in
|
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# CI and from inside simulate-restore.sh as a preflight.
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#
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# ASCII only, no emojis - matches the repo style gate.
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set -uo pipefail
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SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
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MANIFEST_PY="${SCRIPT_DIR}/manifest.py"
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RESTORE_SH="${SCRIPT_DIR}/restore.sh"
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WORKDIR="$(mktemp -d)"
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trap 'rm -rf "${WORKDIR}"' EXIT
|
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|
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# The backup image ships python3; a dev host may only have `python` (and on
|
||||
# Windows `python3` can be a non-functional Store alias that resolves on PATH
|
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# but errors when run). Pick the first interpreter that actually EXECUTES, so
|
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# this tester runs anywhere without changing the shipped scripts.
|
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PY=""
|
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for candidate in python3 python py; do
|
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if "${candidate}" -c 'pass' >/dev/null 2>&1; then
|
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PY="${candidate}"
|
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break
|
||||
fi
|
||||
done
|
||||
[ -n "${PY}" ] || { echo "[test] ERROR: no working python interpreter found"; exit 1; }
|
||||
|
||||
passes=0
|
||||
fails=0
|
||||
pass() { echo "[test] PASS: $*"; passes=$((passes + 1)); }
|
||||
fail() { echo "[test] FAIL: $*"; fails=$((fails + 1)); }
|
||||
|
||||
# Build a throwaway core migration chain: baseline -> mid -> head. The gate in
|
||||
# restore.sh only needs each version file to declare `revision = '<id>'`, so
|
||||
# that is all we write.
|
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build_chain() {
|
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root="$1"
|
||||
versions="${root}/versions"
|
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mkdir -p "${versions}"
|
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printf "revision = '%s'\ndown_revision = None\n" \
|
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'0001_baseline' > "${versions}/0001_baseline.py"
|
||||
printf "revision = '%s'\ndown_revision = '%s'\n" \
|
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'0002_mid' '0001_baseline' > "${versions}/0002_mid.py"
|
||||
printf "revision = '%s'\ndown_revision = '%s'\n" \
|
||||
'0003_head' '0002_mid' > "${versions}/0003_head.py"
|
||||
}
|
||||
|
||||
# Fake a gzipped mysqldump that stamps a given alembic_version, matching the
|
||||
# INSERT shape restore.sh greps for when a legacy manifest lacks datarev.
|
||||
build_dump() {
|
||||
out="$1"; datarev="$2"
|
||||
{
|
||||
echo 'DROP TABLE IF EXISTS `alembic_version`;'
|
||||
echo 'CREATE TABLE `alembic_version` (`version_num` varchar(32));'
|
||||
echo 'INSERT INTO `alembic_version` VALUES'
|
||||
echo "('${datarev}');"
|
||||
} | gzip -c > "${out}"
|
||||
}
|
||||
|
||||
# Mirror of the restore.sh predicate: does the code chain know this revision?
|
||||
# Kept identical to restore.sh so this test tracks the shipped decision.
|
||||
code_knows_revision() {
|
||||
versions_dir="$1"; datarev="$2"
|
||||
grep -rqE "^revision = ['\"]${datarev}['\"]" "${versions_dir}" 2>/dev/null
|
||||
}
|
||||
|
||||
# Mirror of the restore.sh datarev extraction: manifest field first, else parse
|
||||
# the dump.
|
||||
set_datarev() {
|
||||
setdir="$1"; dbdump="$2"
|
||||
value="$(${PY} -c \
|
||||
'import json,sys;print(json.load(open(sys.argv[1])).get("datarev",""))' \
|
||||
"${setdir}/manifest.json" 2>/dev/null || echo "")"
|
||||
if [ -z "${value}" ]; then
|
||||
value="$(gunzip -c "${dbdump}" \
|
||||
| grep -A2 -i 'INSERT INTO `alembic_version`' \
|
||||
| grep -oE "'[0-9a-zA-Z_]+'" | tr -d "'" | head -1)"
|
||||
fi
|
||||
printf '%s' "${value}"
|
||||
}
|
||||
|
||||
CHAIN="${WORKDIR}/migrations"
|
||||
build_chain "${CHAIN}"
|
||||
VERSIONS="${CHAIN}/versions"
|
||||
|
||||
# --- 1. manifest.py records datarev distinct from the code head -------------
|
||||
SET1="${WORKDIR}/set1"; mkdir -p "${SET1}"
|
||||
${PY} "${MANIFEST_PY}" --out "${SET1}/manifest.json" \
|
||||
--migrations "${CHAIN}" --plugins "${WORKDIR}/noplugins" \
|
||||
--datarev '0002_mid' --takenat '2024-01-01T00:00:00Z' >/dev/null 2>&1
|
||||
recorded="$(${PY} -c \
|
||||
'import json,sys;print(json.load(open(sys.argv[1])).get("datarev",""))' \
|
||||
"${SET1}/manifest.json" 2>/dev/null)"
|
||||
head_stamp="$(${PY} -c \
|
||||
'import json,sys;print(json.load(open(sys.argv[1])).get("schemarev",{}).get("core",[]))' \
|
||||
"${SET1}/manifest.json" 2>/dev/null)"
|
||||
if [ "${recorded}" = '0002_mid' ]; then
|
||||
pass "manifest.py records datarev (${recorded}) separate from code head ${head_stamp}"
|
||||
else
|
||||
fail "manifest.py did not record datarev (got '${recorded}')"
|
||||
fi
|
||||
|
||||
# --- 2. datarev the code KNOWS (behind head) is allowed --------------------
|
||||
DBDUMP1="${SET1}/db.sql.gz"; build_dump "${DBDUMP1}" '0002_mid'
|
||||
rev="$(set_datarev "${SET1}" "${DBDUMP1}")"
|
||||
if [ "${rev}" = '0002_mid' ] && code_knows_revision "${VERSIONS}" "${rev}"; then
|
||||
pass "data behind code (${rev}) is known and allowed to restore"
|
||||
else
|
||||
fail "data behind code (${rev}) was not accepted"
|
||||
fi
|
||||
|
||||
# --- 3. datarev the code does NOT know (newer than build) is refused -------
|
||||
SET2="${WORKDIR}/set2"; mkdir -p "${SET2}"
|
||||
${PY} "${MANIFEST_PY}" --out "${SET2}/manifest.json" \
|
||||
--migrations "${CHAIN}" --plugins "${WORKDIR}/noplugins" \
|
||||
--datarev '0004_future' --takenat '2024-02-01T00:00:00Z' >/dev/null 2>&1
|
||||
DBDUMP2="${SET2}/db.sql.gz"; build_dump "${DBDUMP2}" '0004_future'
|
||||
rev="$(set_datarev "${SET2}" "${DBDUMP2}")"
|
||||
if [ "${rev}" = '0004_future' ] && ! code_knows_revision "${VERSIONS}" "${rev}"; then
|
||||
pass "data ahead of code (${rev}) is unknown and correctly refused"
|
||||
else
|
||||
fail "data ahead of code (${rev}) was not refused"
|
||||
fi
|
||||
|
||||
# --- 4. legacy manifest (no datarev) falls back to the dump ----------------
|
||||
SET3="${WORKDIR}/set3"; mkdir -p "${SET3}"
|
||||
# A pre-datarev manifest: schemarev present, datarev absent/empty.
|
||||
printf '{"takenat":"2023-06-01T00:00:00Z","schemarev":{"core":["0003_head"]}}' \
|
||||
> "${SET3}/manifest.json"
|
||||
DBDUMP3="${SET3}/db.sql.gz"; build_dump "${DBDUMP3}" '0001_baseline'
|
||||
rev="$(set_datarev "${SET3}" "${DBDUMP3}")"
|
||||
if [ "${rev}" = '0001_baseline' ] && code_knows_revision "${VERSIONS}" "${rev}"; then
|
||||
pass "legacy set with no datarev falls back to dump revision (${rev})"
|
||||
else
|
||||
fail "legacy set fallback failed (got '${rev}')"
|
||||
fi
|
||||
|
||||
# --- 5. restore.sh hands off to the api instead of self-completing ---------
|
||||
if grep -q '\.upgrade-requested' "${RESTORE_SH}" \
|
||||
&& grep -q "status_write restore upgrading" "${RESTORE_SH}" \
|
||||
&& ! grep -qE 'status_write restore done' "${RESTORE_SH}"; then
|
||||
pass "restore.sh parks in 'upgrading' and hands off via .upgrade-requested"
|
||||
else
|
||||
fail "restore.sh does not hand off the upgrade to the api"
|
||||
fi
|
||||
|
||||
echo "=================================================="
|
||||
echo "[test] datarev gate: ${passes} passed, ${fails} failed"
|
||||
echo "=================================================="
|
||||
[ "${fails}" -eq 0 ]
|
||||
Reference in New Issue
Block a user