$ git clone -n https://src.fedoraproject.org/rpms/ghc-tasty.git /var/lib/mock/f38-build-side-42-init-devel-1112156-30084/root/chroot_tmpdir/scmroot/ghc-tasty
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1112156-30084/root/chroot_tmpdir/scmroot/ghc-tasty'...
$ git fetch origin aaea659f3b26dc22c8d3417e7d7bb7066e389b42:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-tasty
 * [new ref]         aaea659f3b26dc22c8d3417e7d7bb7066e389b42 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aaea659 arch dependency on unbounded-delays