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Allow a migration to clear a pre-4 layout that is a security defect

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The upgrade command only runs on a machine still crossing 3 to 4, so a
vulnerable file an old installer wrote never gets swept on an install
that crossed already. It ends by running omarchy-migrate, so a single
migration reaches both populations.
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acrogenesis
2026-08-29 19:22:44 -06:00
parent 158e8cfb3a
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agents/skills/migrations.md
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@@ -165,3 +165,14 @@ omarchy-migrate
Omarchy 4.0 is upgraded through `bin/omarchy-upgrade-to-quattro`, not through the
normal migration runner. Do not add compatibility migrations for old installer
layouts; put pre-4 package-layout transition work in the upgrade command instead.
Clearing a pre-4 layout that is a security defect is the exception, and belongs in
a migration. The upgrade command only runs on a machine still making the 3 to 4
crossing, so anything put there never reaches an install that crossed already —
and a file an old installer wrote with a vulnerability in it is still sitting on
those machines. The upgrade command finishes by running `omarchy-migrate`
(`run_post_upgrade_migrations`), so one migration reaches both populations;
a copy in the upgrade command would only be a second copy of the same predicate
to keep correct. Such a migration must name the defect it clears and match the
state the old installer actually produced, so a file the user wrote themselves is
left alone.