$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Warnings.git /var/lib/mock/f45-build-26922-620/root/chroot_tmpdir/scmroot/perl-Test-Warnings
Cloning into '/var/lib/mock/f45-build-26922-620/root/chroot_tmpdir/scmroot/perl-Test-Warnings'...
$ git fetch origin 88e5bf20a49833730eed0629274ff78bafd63d35:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Warnings
 * [new ref]         88e5bf20a49833730eed0629274ff78bafd63d35 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 88e5bf2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild