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rebase

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Rebase an OpenMeter branch onto another branch and handle repo-specific gotchas like sequential migrations, atlas.sum conflicts, Ent regeneration, and targeted verification.

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Source SKILL.md: https://github.com/openmeterio/openmeter/blob/HEAD/.agents/skills/rebase/SKILL.md

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Rebase Gotchas

Use this skill when rebasing an OpenMeter branch, especially onto origin/main, and there may be migration, Ent, or generated-code conflicts.

Before rebasing

  • Check git status --short --branch first.
  • Do not start a rebase on top of unrelated uncommitted work without preserving it first.
  • Fetch the target branch explicitly before rebasing.

Standard flow

  1. git fetch origin main
  2. git rebase origin/main
  3. Resolve conflicts one commit at a time.
  4. Prefer GIT_EDITOR=true git rebase --continue in non-interactive shells.

First rule for conflicts

When a rebase conflict appears, the first move should usually be regenerating generated artifacts:

make generate

Treat this as the default first step before manually resolving conflicted generated files.

Why:

  • conflicts often come from generated Ent code
  • conflicts can come from API-generated code
  • migration-related schema changes often need fresh generated output too

In practice, regenerating first resolves or clarifies most conflicts much faster than hand-merging generated files.

Migration conflicts

OpenMeter migrations must stay sequential by timestamp.

If a rebased commit introduces a migration that is now older than migrations already on the target branch:

  • Remove the older migration pair instead of keeping both.
  • Do not hand-edit the SQL to force it in.
  • Recreate the migration at the new head after regeneration.

Typical flow:

  1. Remove the outdated .up.sql and .down.sql files.
  2. Regenerate code:
make generate
  1. Generate a fresh migration at the current head:
atlas migrate --env local diff <migration-name>
  1. Stage the newly generated migration pair and tools/migrate/migrations/atlas.sum.

atlas.sum conflicts

If tools/migrate/migrations/atlas.sum conflicts or gets out of sync:

atlas migrate --env local hash

Then stage atlas.sum. Do not hand-edit checksum entries unless there is no other option.

Ent and generated code

  • openmeter/ent/schema/*.go is the source of truth.
  • Never hand-edit openmeter/ent/db/.
  • After schema-related rebased changes, run make generate before regenerating migrations.
  • If generated files conflict, prefer regeneration over manual merge edits when possible.

Shell/runtime notes

  • If the ambient shell is missing Go/toolchain binaries, use:
nix develop --impure .#ci -c <command>

  • Prefer direct command execution. Do not wrap commands in sh -lc, bash -lc, or similar helper shells when a direct invocation works. For environment variables, prefer env KEY=value <command> or KEY=value <command>.

  • Atlas migration diffing uses the local dev environment and may require the direnv shell:

direnv exec . atlas migrate --env local diff <migration-name>

Verification

Before continuing or finishing the rebase, run the smallest relevant test slice for the touched area.

For ledger work, the usual check is:

POSTGRES_HOST=127.0.0.1 go test -tags=dynamic ./openmeter/ledger/...

If there is a known pre-existing failure, call it out explicitly and separate it from any new regression introduced by the rebase.

Important reminders

  • Never manually rewrite generated migration SQL unless the user explicitly wants that.
  • Never keep two migrations that represent the same schema change at different timestamps.
  • Prefer regenerating over “merging” generated artifacts.
  • Stage only the resolved files for the current rebase step before git rebase --continue.