$ git clone -n https://src.fedoraproject.org/rpms/gerbv.git /var/lib/mock/f41-build-side-1-2636236-26209/root/chroot_tmpdir/scmroot/gerbv
Cloning into '/var/lib/mock/f41-build-side-1-2636236-26209/root/chroot_tmpdir/scmroot/gerbv'...
$ git fetch origin 193e5e73cc85cce931165053136a9ff191998ddc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gerbv
 * [new ref]         193e5e73cc85cce931165053136a9ff191998ddc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 193e5e7 Update to 2.10.0