$ git clone -n https://src.fedoraproject.org/rpms/samba.git /var/lib/mock/f41-build-808079-145651/root/chroot_tmpdir/scmroot/samba
Cloning into '/var/lib/mock/f41-build-808079-145651/root/chroot_tmpdir/scmroot/samba'...
$ git fetch origin 058c9e46a835f08b4fc623007a8870cbd39180e3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/samba
 * [new ref]         058c9e46a835f08b4fc623007a8870cbd39180e3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 058c9e4 Update to version 4.20.1