$ git clone -n https://src.fedoraproject.org/rpms/rust-base64ct.git /var/lib/mock/f40-build-2565883-62189/root/chroot_tmpdir/scmroot/rust-base64ct
Cloning into '/var/lib/mock/f40-build-2565883-62189/root/chroot_tmpdir/scmroot/rust-base64ct'...
$ git fetch origin 6c2a9d0d56f9b61b76cbff30c6e188a08ffa7fed:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-base64ct
 * [new ref]         6c2a9d0d56f9b61b76cbff30c6e188a08ffa7fed -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6c2a9d0 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild