$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-cvec.git /var/lib/mock/f42-build-3459564-45515/root/chroot_tmpdir/scmroot/gap-pkg-cvec
Cloning into '/var/lib/mock/f42-build-3459564-45515/root/chroot_tmpdir/scmroot/gap-pkg-cvec'...
$ git fetch origin 540b7a9451da3797e2921d7ad931209a4bac5e9a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-cvec
 * [new ref]         540b7a9451da3797e2921d7ad931209a4bac5e9a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 540b7a9 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild