$ git clone -n https://src.fedoraproject.org/rpms/rust-userfaultfd.git /var/lib/mock/f39-build-1827055-41870/root/chroot_tmpdir/scmroot/rust-userfaultfd
Cloning into '/var/lib/mock/f39-build-1827055-41870/root/chroot_tmpdir/scmroot/rust-userfaultfd'...
$ git fetch origin bbbeebf918544ad479f73b92d2e6bfefbaa177e6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-userfaultfd
 * [new ref]         bbbeebf918544ad479f73b92d2e6bfefbaa177e6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bbbeebf Update to version 0.7.0