$ git clone -n https://src.fedoraproject.org/rpms/perl-Gravatar-URL.git /var/lib/mock/f45-build-23828-599/root/chroot_tmpdir/scmroot/perl-Gravatar-URL
Cloning into '/var/lib/mock/f45-build-23828-599/root/chroot_tmpdir/scmroot/perl-Gravatar-URL'...
$ git fetch origin 5685ab0503668eecf58512954061f8e850a4153a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Gravatar-URL
 * [new ref]         5685ab0503668eecf58512954061f8e850a4153a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5685ab0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild