$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-cvec.git /var/lib/mock/f40-build-2590581-62627/root/chroot_tmpdir/scmroot/gap-pkg-cvec
Cloning into '/var/lib/mock/f40-build-2590581-62627/root/chroot_tmpdir/scmroot/gap-pkg-cvec'...
$ git fetch origin 68b87306f7d73968322c14106fb19ac19e265b3b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-cvec
 * [new ref]         68b87306f7d73968322c14106fb19ac19e265b3b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 68b8730 Rebuild for gap 4.13.0