$ git clone -n https://src.fedoraproject.org/rpms/perl-CGI-Ajax.git /var/lib/mock/f45-build-21939-588/root/chroot_tmpdir/scmroot/perl-CGI-Ajax
Cloning into '/var/lib/mock/f45-build-21939-588/root/chroot_tmpdir/scmroot/perl-CGI-Ajax'...
$ git fetch origin af2e244236b1adf899e64bb757aff1d615bafded:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-CGI-Ajax
 * [new ref]         af2e244236b1adf899e64bb757aff1d615bafded -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at af2e244 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild