$ git clone -n https://src.fedoraproject.org/rpms/libgpg-error.git /var/lib/mock/f40-build-785898-134133/root/chroot_tmpdir/scmroot/libgpg-error
Cloning into '/var/lib/mock/f40-build-785898-134133/root/chroot_tmpdir/scmroot/libgpg-error'...
$ git fetch origin 4ab64fa8468c786e8695e64efe8ad4161a460894:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libgpg-error
 * [new ref]         4ab64fa8468c786e8695e64efe8ad4161a460894 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4ab64fa 1.48-1