ADR-0076: About rio shows the build's commit identity

• Status: Accepted; the release version it lacked arrived with ADR-0130
• Date: 2026-09-08
• Deciders: jka
• Decision: D76

Context

rio has no release version yet; the first alpha tag is a release gate in RELEASING.md. Testers still need to state exactly which build they run.

Decision

A Help menu, last in the menubar, contains About rio. The dialog shows the build identity from git describe --tags --always and the commit date, both read from rio's own source directory, plus the protocol version. The values are computed on first use and cached; a checkout without git shows "unknown".

The GUI runs git directly here, rather than through the core's git.* operations, because this is a fact about the local installation, not about the user's project, and the core may be a different build on another machine.

Consequences

• Once a release is tagged, the tag appears instead of the commit hash with no change.
• Nothing runs at start-up.