$ git clone -n https://src.fedoraproject.org/rpms/perl-Set-Object.git /var/lib/mock/f41-build-816818-150442/root/chroot_tmpdir/scmroot/perl-Set-Object
Cloning into '/var/lib/mock/f41-build-816818-150442/root/chroot_tmpdir/scmroot/perl-Set-Object'...
$ git fetch origin d061d07d5fb0d0815043bf5a421d658cca1566f3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Set-Object
 * [new ref]         d061d07d5fb0d0815043bf5a421d658cca1566f3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d061d07 Perl 5.40 rebuild