$ git clone -n https://src.fedoraproject.org/rpms/perl-IO-Socket-Multicast.git /var/lib/mock/f41-build-816502-150225/root/chroot_tmpdir/scmroot/perl-IO-Socket-Multicast
Cloning into '/var/lib/mock/f41-build-816502-150225/root/chroot_tmpdir/scmroot/perl-IO-Socket-Multicast'...
$ git fetch origin ff825ebd970c2a7ebcd11bb3be2034cb8ef81cc0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-IO-Socket-Multicast
 * [new ref]         ff825ebd970c2a7ebcd11bb3be2034cb8ef81cc0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ff825eb Perl 5.40 rebuild