$ git clone -n https://src.fedoraproject.org/rpms/perl-MCE-Shared.git /var/lib/mock/f39-build-1485799-34461/root/chroot_tmpdir/scmroot/perl-MCE-Shared
Cloning into '/var/lib/mock/f39-build-1485799-34461/root/chroot_tmpdir/scmroot/perl-MCE-Shared'...
$ git fetch origin 9e93cd20d1fd12324db1cae503ac16c803a70a07:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-MCE-Shared
 * [new ref]         9e93cd20d1fd12324db1cae503ac16c803a70a07 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9e93cd2 Update to 1.886