$ git clone -n https://src.fedoraproject.org/rpms/perl-AuthCAS.git /var/lib/mock/f45-build-21788-588/root/chroot_tmpdir/scmroot/perl-AuthCAS
Cloning into '/var/lib/mock/f45-build-21788-588/root/chroot_tmpdir/scmroot/perl-AuthCAS'...
$ git fetch origin 958af7ee2e267c2ad8756465cede5ec56b75f73d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-AuthCAS
 * [new ref]         958af7ee2e267c2ad8756465cede5ec56b75f73d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 958af7e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild