$ git clone -n https://src.fedoraproject.org/rpms/perl-mime-construct.git /var/lib/mock/f40-build-2239320-53610/root/chroot_tmpdir/scmroot/perl-mime-construct
Cloning into '/var/lib/mock/f40-build-2239320-53610/root/chroot_tmpdir/scmroot/perl-mime-construct'...
$ git fetch origin 64a306efec54b0f8dcd9be12bd65bfc0fcd031f0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-mime-construct
 * [new ref]         64a306efec54b0f8dcd9be12bd65bfc0fcd031f0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 64a306e make several spec file improvements