$ git clone -n https://src.fedoraproject.org/rpms/perl-Net-IP-CMatch.git /var/lib/mock/f41-build-815980-149916/root/chroot_tmpdir/scmroot/perl-Net-IP-CMatch
Cloning into '/var/lib/mock/f41-build-815980-149916/root/chroot_tmpdir/scmroot/perl-Net-IP-CMatch'...
$ git fetch origin 417540d6b2837c7b2a1992cd3edd6461b041b6cb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Net-IP-CMatch
 * [new ref]         417540d6b2837c7b2a1992cd3edd6461b041b6cb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 417540d Perl 5.40 rebuild