$ git clone -n https://src.fedoraproject.org/rpms/perl-Data-JavaScript.git /var/lib/mock/f45-build-22883-594/root/chroot_tmpdir/scmroot/perl-Data-JavaScript
Cloning into '/var/lib/mock/f45-build-22883-594/root/chroot_tmpdir/scmroot/perl-Data-JavaScript'...
$ git fetch origin 24c68eb3a7b6198a4799a60f98ffedea4b64485b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Data-JavaScript
 * [new ref]         24c68eb3a7b6198a4799a60f98ffedea4b64485b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 24c68eb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild