$ git clone -n https://src.fedoraproject.org/rpms/perl-Net-DNS.git /var/lib/mock/f45-build-25252-610/root/chroot_tmpdir/scmroot/perl-Net-DNS
Cloning into '/var/lib/mock/f45-build-25252-610/root/chroot_tmpdir/scmroot/perl-Net-DNS'...
$ git fetch origin fd7a53c9aa0635950a2aeaa3cce976aaa3a0e63d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Net-DNS
 * [new ref]         fd7a53c9aa0635950a2aeaa3cce976aaa3a0e63d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fd7a53c 1.56 bump (rhbz#2501994)