$ git clone -n https://src.fedoraproject.org/rpms/rust-userfaultfd.git /var/lib/mock/f40-build-2326249-58828/root/chroot_tmpdir/scmroot/rust-userfaultfd
Cloning into '/var/lib/mock/f40-build-2326249-58828/root/chroot_tmpdir/scmroot/rust-userfaultfd'...
$ git fetch origin d26ee4c10be83f3946a910af401b774dae98991e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-userfaultfd
 * [new ref]         d26ee4c10be83f3946a910af401b774dae98991e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d26ee4c Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild