$ git clone -n https://src.fedoraproject.org/rpms/perl-MogileFS-Server.git /var/lib/mock/f41-build-691989-12735/root/chroot_tmpdir/scmroot/perl-MogileFS-Server
Cloning into '/var/lib/mock/f41-build-691989-12735/root/chroot_tmpdir/scmroot/perl-MogileFS-Server'...
$ git fetch origin 04cdcaf9050d8e683086124c66cb088883daff68:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-MogileFS-Server
 * [new ref]         04cdcaf9050d8e683086124c66cb088883daff68 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 04cdcaf Eliminate use of obsolete %patchN syntax (#2283636)