$ git clone -n https://src.fedoraproject.org/rpms/perl-Net-Netmask.git /var/lib/mock/f45-build-25327-610/root/chroot_tmpdir/scmroot/perl-Net-Netmask
Cloning into '/var/lib/mock/f45-build-25327-610/root/chroot_tmpdir/scmroot/perl-Net-Netmask'...
$ git fetch origin 3e438bb37eb2262d4c567ff884657dd5f9810e92:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Net-Netmask
 * [new ref]         3e438bb37eb2262d4c567ff884657dd5f9810e92 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3e438bb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild