$ git clone -n https://src.fedoraproject.org/rpms/perl-Function-Parameters.git /var/lib/mock/f41-build-816815-150442/root/chroot_tmpdir/scmroot/perl-Function-Parameters
Cloning into '/var/lib/mock/f41-build-816815-150442/root/chroot_tmpdir/scmroot/perl-Function-Parameters'...
$ git fetch origin e33e61ab3cd648a50e76ffd5e242c612b8a5dc92:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Function-Parameters
 * [new ref]         e33e61ab3cd648a50e76ffd5e242c612b8a5dc92 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e33e61a Perl 5.40 rebuild