$ git clone -n https://src.fedoraproject.org/rpms/perl-HTML-HTML5-Sanity.git /var/lib/mock/f45-build-23902-601/root/chroot_tmpdir/scmroot/perl-HTML-HTML5-Sanity
Cloning into '/var/lib/mock/f45-build-23902-601/root/chroot_tmpdir/scmroot/perl-HTML-HTML5-Sanity'...
$ git fetch origin bb5902fe958636b133ee5c5ee77e678dd70afa19:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-HTML-HTML5-Sanity
 * [new ref]         bb5902fe958636b133ee5c5ee77e678dd70afa19 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bb5902f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild