$ git clone -n https://src.fedoraproject.org/rpms/perl-Net-CIDR.git /var/lib/mock/f45-build-25280-610/root/chroot_tmpdir/scmroot/perl-Net-CIDR
Cloning into '/var/lib/mock/f45-build-25280-610/root/chroot_tmpdir/scmroot/perl-Net-CIDR'...
$ git fetch origin c2f2bd8ee6eaea3ed05647af30464ecb1798a044:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Net-CIDR
 * [new ref]         c2f2bd8ee6eaea3ed05647af30464ecb1798a044 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c2f2bd8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild