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WalkthroughDetects whether the old PostgreSQL cluster used data checksums and passes a corresponding --data-checksums flag into initdb during upgrade initialization; also bumps three postgres_release version strings in ansible/vars.yml. Changes
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Tested upgrade with various checksum/no checksum permutations, pause and restore and functionality. Ready for review and merge |
hunleyd
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Jan 28, 2026
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@jchancojr take a peek? |
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The Problem
Users upgrading via Supabase UI encounter this error:
old cluster uses data checksums but the new one does not
Root Cause
Commit cf9bce1 (Nov 14, 2025) enabled data checksums for new PostgreSQL
installations, but the pg_upgrade scripts were not updated to match.
Affected Files
File: ansible/tasks/setup-postgres.yml
Has --data-checksums?: Yes
Lines: https://github.com/supabase/postgres/blob/develop/ansible/tasks/setup-postgres.yml#L232,
https://github.com/supabase/postgres/blob/develop/ansible/tasks/setup-postgres.yml#L260,
https://github.com/supabase/postgres/blob/develop/ansible/tasks/setup-postgres.yml#L277
────────────────────────────────────────
File: ansible/files/admin_api_scripts/pg_upgrade_scripts/initiate.sh
Has --data-checksums?: No
Lines: https://github.com/supabase/postgres/blob/develop/ansible/files/admin_api_scripts/pg_upgrade_scripts/initiate.sh#L470,
https://github.com/supabase/postgres/blob/develop/ansible/files/admin_api_scripts/pg_upgrade_scripts/initiate.sh#L472,
https://github.com/supabase/postgres/blob/develop/ansible/files/admin_api_scripts/pg_upgrade_scripts/initiate.sh#L475
What Happens
The Fix
Detect whether the old cluster has checksums enabled using pg_controldata, then conditionally pass --data-checksums to initdb.
Add detection after PGDATAOLD is set (after line 244):
Check if old cluster has data checksums enabled
CHECKSUM_VERSION=$("$PGBINOLD/pg_controldata" "$PGDATAOLD" | grep -i checksum | awk '{print $NF}')
if [ "$CHECKSUM_VERSION" != "0" ]; then
CHECKSUM_FLAG="--data-checksums"
else
CHECKSUM_FLAG=""
fi
Update all three initdb calls to use $CHECKSUM_FLAG:
$PGBINNEW/initdb $CHECKSUM_FLAG --encoding=$SERVER_ENCODING --locale-provider=icu ...
$PGBINNEW/initdb $CHECKSUM_FLAG --encoding=$SERVER_ENCODING --lc-collate=...
$PGBINNEW/initdb $CHECKSUM_FLAG -L $PGSHARENEW -D $PGDATANEW/ --username=supabase_admin
Summary by CodeRabbit
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