$ git clone -n https://src.fedoraproject.org/rpms/perl-Module-Build.git /var/lib/mock/f45-build-24789-606/root/chroot_tmpdir/scmroot/perl-Module-Build
Cloning into '/var/lib/mock/f45-build-24789-606/root/chroot_tmpdir/scmroot/perl-Module-Build'...
$ git fetch origin e526e73e2b60988dfd0922c4a90f4d3e3b509829:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Module-Build
 * [new ref]         e526e73e2b60988dfd0922c4a90f4d3e3b509829 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e526e73 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild