$ git clone -n https://src.fedoraproject.org/rpms/rubygem-mime-types-data.git /var/lib/mock/f40-build-2322977-58691/root/chroot_tmpdir/scmroot/rubygem-mime-types-data
Cloning into '/var/lib/mock/f40-build-2322977-58691/root/chroot_tmpdir/scmroot/rubygem-mime-types-data'...
$ git fetch origin 3ebba372fc4b4786a140e2b80eceb6c7a934c8df:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-mime-types-data
 * [new ref]         3ebba372fc4b4786a140e2b80eceb6c7a934c8df -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3ebba37 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild