6fe71293

By: Tom Sydney Kerckhove <syd@cs-syd.eu>

Take the mutation children's locale from a Haskell derivation

The coverage and mutation phases are plain stdenv derivations, so they get
none of the environment the Haskell builder establishes for the test
executables they run. A locale is part of that environment and not something a
test suite is expected to set up for itself.

Without one, anything a test spawns that consults the locale is configured
differently here than anywhere else that suite runs. PostgreSQL's initdb takes
its database encoding from the locale: with LANG unset it makes an SQL_ASCII
cluster, where SUBSTRING counts bytes rather than characters, so a query that
abbreviates a multi-byte string hands back a half character and the connection
fails with 'invalid byte sequence for encoding UTF8'. That reads as a flaky
test, and it is reachable only through this check.

Copied off the driver, which is a Haskell package already in scope, rather
than restated here, so these follow whatever nixpkgs decides the Haskell
locale is instead of drifting from it.

Total

37s

Created 2 weeks ago Started 2 weeks ago Finished 2 weeks ago

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