$ git clone -n https://src.fedoraproject.org/rpms/libguestfs.git /var/lib/mock/f38-build-side-42-init-devel-747537-27661/root/chroot_tmpdir/scmroot/libguestfs
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-747537-27661/root/chroot_tmpdir/scmroot/libguestfs'...
$ git fetch origin 27e91a3ddfe60bbce8f2cfba347c5c6fcacb8721:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libguestfs
 * [new ref]         27e91a3ddfe60bbce8f2cfba347c5c6fcacb8721 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 27e91a3 New upstream stable branch 1.50.1