$ git clone -n https://src.fedoraproject.org/rpms/libguestfs.git /var/lib/mock/f40-build-1817475-24911/root/chroot_tmpdir/scmroot/libguestfs
Cloning into '/var/lib/mock/f40-build-1817475-24911/root/chroot_tmpdir/scmroot/libguestfs'...
$ git fetch origin e472c432fc52386ac40f11a58e75934f576f6b58:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libguestfs
 * [new ref]         e472c432fc52386ac40f11a58e75934f576f6b58 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e472c43 New stable branch version 1.52.2