bvandeusen
98b56330d0
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Reconciling the models against the deployed schema needs the actual pg_dump, not an inference from the unified diff. Parsing table context out of diff hunks drops every table whose CREATE TABLE line falls outside a hunk — it under-reported 81 columns across 13 tables when the real figure spans more, missing artist, gpu_job, download_event and external_link entirely. Same checksummed-base64 transport as the candidate baseline, for the same reason: a plain cat of a file this size was silently truncated mid-line by the runner on run 4964.
231 lines
11 KiB
YAML
231 lines
11 KiB
YAML
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# TEMPORARY — milestone 328 steps 1-2. Delete once the baseline is stamped.
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#
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# Squashing 87 alembic revisions into one baseline has exactly one dangerous
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# failure: the generated baseline does not reproduce the schema the chain
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# produced, `alembic stamp` writes a version string anyway (it validates
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# NOTHING), and the divergence surfaces on the next real migration against the
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# operator's live data.
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#
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# So this workflow does the comparison in CI, where a pgvector Postgres already
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# gets built from the chain on every integration run, and nothing is at risk.
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# It answers one question: does `upgrade head` on the collapsed chain produce a
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# byte-identical schema to `upgrade head` on the 87-revision chain?
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#
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# The chain is read from git rather than from the working tree, so this keeps
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# working AFTER the old revisions are deleted — `chain_ref` names a commit that
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# still has them. That is what makes this the proof for step 1 and the
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# pre-flight for step 2, rather than a one-shot script.
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#
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# While the chain is still present it also autogenerates a candidate baseline
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# from the models and prints it. That is a starting point, NOT the answer:
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# autogenerate reads SQLAlchemy metadata, and three things here do not live
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# there —
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# * CREATE EXTENSION vector (0001)
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# * CREATE EXTENSION tsm_system_rows (0004)
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# * the HNSW index on image_record.siglip_embedding, which is raw SQL
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# because alembic's create_index cannot express `USING hnsw (...)` (0036)
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# plus any CHECK constraint or server_default that a migration added without
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# the model declaring it. Those must be hand-added, and the diff below is what
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# proves none were missed.
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name: Alembic baseline
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on:
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workflow_dispatch:
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inputs:
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chain_ref:
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description: 'Commit/tag that still carries the full 0001..0087 chain'
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type: string
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default: '0a5bbe8'
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jobs:
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compare:
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runs-on: python-ci
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container:
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image: git.fabledsword.com/bvandeusen/ci-python:3.14
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env:
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DB_USER: fabledcurator
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DB_PASSWORD: ci_integration
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DB_PORT: "5432"
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DB_NAME: fabledcurator_test
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SECRET_KEY: ci_integration_placeholder
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services:
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postgres:
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image: pgvector/pgvector:pg16
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env:
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POSTGRES_USER: fabledcurator
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POSTGRES_PASSWORD: ci_integration
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POSTGRES_DB: fabledcurator_test
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options: >-
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--health-cmd "pg_isready -U fabledcurator"
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--health-interval 10s
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--health-timeout 5s
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--health-retries 10
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steps:
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- uses: actions/checkout@v4
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with:
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# Full history is the point: `chain_ref` is read out of git, so a
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# shallow clone would not have the revisions to compare against.
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fetch-depth: 0
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- name: Resolve the Postgres service and install deps
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run: |
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set -eux
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# Same service-IP dance as ci.yml's integration job; see the long
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# comment there for why the job name must stay separator-free.
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PG=$(docker ps --filter "name=compare" --filter "ancestor=pgvector/pgvector:pg16" -q | head -n1)
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test -n "$PG"
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PG_IP=$(docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' "$PG")
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test -n "$PG_IP"
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echo "PG_CONTAINER=$PG" >> "$GITHUB_ENV"
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echo "DB_HOST=$PG_IP" >> "$GITHUB_ENV"
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for i in $(seq 1 60); do
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(echo > "/dev/tcp/$PG_IP/5432") >/dev/null 2>&1 && break
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sleep 2
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done
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if command -v uv >/dev/null 2>&1; then
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uv pip install --system -r requirements.txt
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else
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pip install -r requirements.txt
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fi
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# DB 1: the 87-revision chain, read out of git at `chain_ref`.
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#
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# A git worktree rather than a checkout, so the current tree — which is
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# what we are testing — is left completely alone.
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- name: Build the schema the OLD chain produces
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env:
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CHAIN_REF: ${{ github.event.inputs.chain_ref }}
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run: |
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set -eux
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docker exec "$PG_CONTAINER" createdb -U fabledcurator fc_chain
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git worktree add /tmp/chain "$CHAIN_REF"
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ls /tmp/chain/alembic/versions/*.py | wc -l
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cd /tmp/chain
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DB_NAME=fc_chain alembic upgrade head
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cd -
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docker exec "$PG_CONTAINER" pg_dump -U fabledcurator --schema-only \
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--no-owner --no-privileges -d fc_chain > chain.sql
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wc -l chain.sql
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# Emit the dump itself, checksummed, for local analysis. Reconciling
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# the models against the deployed schema (#3275) needs the ACTUAL
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# schema, not an inference from a diff — parsing table context out of
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# unified-diff hunks drops every table whose CREATE TABLE line falls
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# outside a hunk, which silently under-reports.
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#
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# base64 + sha256 for the same reason as the candidate: a plain cat
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# of a file this size was truncated mid-line by the runner with the
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# step still green (run 4964).
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set +x
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B64=$(base64 -w 120 chain.sql)
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echo "===== BEGIN CHAIN SCHEMA (base64) ====="
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echo "$B64"
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echo "===== END CHAIN SCHEMA ====="
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echo "chain-sha256: $(sha256sum chain.sql | cut -d' ' -f1)"
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echo "chain-bytes: $(wc -c < chain.sql)"
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set -x
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# A candidate baseline, autogenerated from the models against an EMPTY
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# database so every table shows up as a create. Printed for a human to
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# finish — it will be missing the three raw-SQL items named at the top.
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#
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# Gated on the TREE, not on a workflow input. A `type: boolean` input
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# read back as `github.event.inputs.generate == 'true'` silently
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# evaluated false on this runner (run 4960 skipped this step entirely
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# with no diagnostic) — the same `github.event.inputs` typing quirk
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# build.yml already works around. The file count is the real question
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# anyway: there is nothing to generate once the chain is collapsed.
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- name: Autogenerate a candidate baseline
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run: |
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set -eux
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if [ "$(ls alembic/versions/*.py | wc -l)" -le 1 ]; then
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echo "already collapsed — nothing to generate"
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exit 0
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fi
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docker exec "$PG_CONTAINER" createdb -U fabledcurator fc_gen
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# Hide the existing revisions so alembic sees an empty history and
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# emits the whole schema rather than a delta.
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mkdir -p /tmp/versions_held
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mv alembic/versions/*.py /tmp/versions_held/ 2>/dev/null || true
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DB_NAME=fc_gen alembic revision --autogenerate -m "baseline" || true
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# Printed rather than uploaded: ci-requirements.md records that this
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# runner cannot do actions/upload-artifact@v4+, and the repo dropped
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# the action entirely in 2026-05, so the job log is the retrieval
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# channel actually proven here.
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#
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# base64, not the raw file. A plain `cat` of the ~33KB candidate was
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# TRUNCATED MID-LINE by the runner on run 4964 — it stopped inside
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# `sa.Column('mime', sa.String(length=128)` and carried straight on
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# to the next traced command, with the step still green. A silent
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# cut in the middle of a schema definition is the worst possible
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# failure here, because the truncated text still looks like a
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# plausible file.
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#
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# base64 at a fixed narrow width gives many short lines instead of
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# few long ones, and — the actual point — a checksum and a line
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# count that make truncation DETECTABLE rather than invisible.
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set +x
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F=$(ls alembic/versions/*.py | head -1)
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B64=$(base64 -w 120 "$F")
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echo "===== BEGIN CANDIDATE BASELINE (base64) ====="
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echo "$B64"
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echo "===== END CANDIDATE BASELINE ====="
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echo "candidate-sha256: $(sha256sum "$F" | cut -d' ' -f1)"
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echo "candidate-bytes: $(wc -c < "$F")"
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echo "candidate-b64-lines: $(echo "$B64" | wc -l)"
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set -x
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# Put the tree back exactly as it was; this job never mutates state.
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rm -f alembic/versions/*.py
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mv /tmp/versions_held/*.py alembic/versions/ 2>/dev/null || true
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# DB 2: whatever the CURRENT tree's alembic/versions produces. Before the
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# squash that is the same 87 revisions and the diff is trivially clean —
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# which is worth running once as a control, so a clean diff after the
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# squash means something.
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- name: Build the schema the CURRENT tree produces
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run: |
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set -eux
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docker exec "$PG_CONTAINER" createdb -U fabledcurator fc_base
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ls alembic/versions/*.py | wc -l
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DB_NAME=fc_base alembic upgrade head
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docker exec "$PG_CONTAINER" pg_dump -U fabledcurator --schema-only \
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--no-owner --no-privileges -d fc_base > baseline.sql
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wc -l baseline.sql
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# The verdict.
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#
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# pg_dump orders dumpable objects by name within type, not by creation
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# order, so two schemas built by different routes are directly
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# comparable. Normalisation is deliberately minimal, because a filter
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# that hides a real difference is the one way this check passes when it
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# should fail — blank lines, SQL comments, trailing whitespace, and:
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#
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# \restrict / \unrestrict — a per-invocation RANDOM NONCE that newer
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# pg_dump emits to fence the dump against injection during restore. It
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# differs on every run by construction, so it is noise by definition,
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# not a schema difference. Measured on run 4960, the control: two dumps
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# of the SAME schema came back 1123 lines each and differed on exactly
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# these two lines and nothing else. That control is what licenses this
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# filter — it was observed to be the only false positive, rather than
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# assumed to be one.
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- name: Diff
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run: |
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set -eu
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norm() {
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grep -vE '^\s*(--|$)' "$1" \
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| grep -vE '^\\(un)?restrict ' \
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| sed 's/[[:space:]]*$//'
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}
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norm chain.sql > a.txt
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norm baseline.sql > b.txt
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echo "normalised: chain=$(wc -l < a.txt) lines, current=$(wc -l < b.txt) lines"
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if diff -u a.txt b.txt > schema.diff; then
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echo "SCHEMAS IDENTICAL — the collapsed chain reproduces the old one."
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else
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echo "SCHEMAS DIFFER — $(grep -cE '^[+-]' schema.diff) changed lines:"
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cat schema.diff
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echo
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echo "The baseline is wrong, not the database. Do not stamp."
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exit 1
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fi
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