$ git clone -n https://src.fedoraproject.org/rpms/libguestfs.git /var/lib/mock/f41-build-1482790-23820/root/chroot_tmpdir/scmroot/libguestfs
Cloning into '/var/lib/mock/f41-build-1482790-23820/root/chroot_tmpdir/scmroot/libguestfs'...
$ git fetch origin 9077713557f4ddb8ad0634a1c633e9cd65365b5b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libguestfs
 * [new ref]         9077713557f4ddb8ad0634a1c633e9cd65365b5b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9077713 Rebuilt for the bin-sbin merge