$ git clone -n https://src.fedoraproject.org/rpms/libguestfs.git /var/lib/mock/f41-build-1697947-24523/root/chroot_tmpdir/scmroot/libguestfs
Cloning into '/var/lib/mock/f41-build-1697947-24523/root/chroot_tmpdir/scmroot/libguestfs'...
$ git fetch origin 8f1a2c16fd7572e2b09bb166bb3d441b1f7538dc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libguestfs
 * [new ref]         8f1a2c16fd7572e2b09bb166bb3d441b1f7538dc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8f1a2c1 Remove syslinux dependencies on RHEL