$ git clone -n https://src.fedoraproject.org/rpms/chemical-mime-data.git /var/lib/mock/f40-build-2339355-59649/root/chroot_tmpdir/scmroot/chemical-mime-data
Cloning into '/var/lib/mock/f40-build-2339355-59649/root/chroot_tmpdir/scmroot/chemical-mime-data'...
$ git fetch origin 64f3395ef6aea5a54e2838f88a86e87b8ade7bed:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/chemical-mime-data
 * [new ref]         64f3395ef6aea5a54e2838f88a86e87b8ade7bed -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 64f3395 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild