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Fix a segfault in the git fetcher #6582

Merged

edolstra merged 1 commit into master from debug-fetchgit-sigsev

May 31, 2022

Commits on May 27, 2022

Fix a segfault in the git fetcher

The git fetcher code used to dereference the (potentially empty) `ref`
input attribute. This was magically working, probably because the
compiler somehow outsmarted us, but is now blowing up with newer nixpkgs
versions.

Fix that by not trying to access this field while we don't know for sure
that it has been defined.

Fix #6554

Théophane Hufschmitt committed May 27, 2022