[Backport staging-25.05] versionCheckHook: Default versionCheckProgram to mainProgram
#454228
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…GRAM` (cherry picked from commit 0c8cc4c)
(cherry picked from commit 98380fc)
…ionCheckProgram` Should `versionCheckProgram` not be specified, the hook now first defaults to `$outputBin/bin/$NIX_MAIN_PROGRAM` before considering `$outputBin/bin/$pname`. Falling back to $pname will also emit a warning now, similar to that of `lib.getExe`. (cherry picked from commit 1b92d2f)
…N_PROGRAM` (cherry picked from commit 651abd9)
(cherry picked from commit 32a6fb6)
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JohnRTitor
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Oct 21, 2025
This should be reverted once/if NixOS#454228 is merged to release-25.05.
emilazy
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Oct 21, 2025
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I don’t think it’s acceptable to make meta cause rebuilds on the release branch. This change has been controversial enough in unstable; see e.g. #412768 (comment) and #430810.
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| - `meta.mainProgram`: Changing this `meta` entry can lead to a package rebuild due to being used to determine the `NIX_MAIN_PROGRAM` environment variable. | ||
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| - `versionCheckHook`: Packages that previously relied solely on `pname` to locate the program used to version check, but have a differing `meta.mainProgram` entry, might now fail. |
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As you can see here, this is a breaking change, and therefore not suitable for backport.
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Bot-based backport to
staging-25.05, triggered by a label in #412768.