$ git clone -n https://src.fedoraproject.org/rpms/rust-userfaultfd-sys.git /var/lib/mock/f39-build-1720246-41229/root/chroot_tmpdir/scmroot/rust-userfaultfd-sys
Cloning into '/var/lib/mock/f39-build-1720246-41229/root/chroot_tmpdir/scmroot/rust-userfaultfd-sys'...
$ git fetch origin 389ad683b90d709bb08590e4499ea72b0fec16ab:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-userfaultfd-sys
 * [new ref]         389ad683b90d709bb08590e4499ea72b0fec16ab -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 389ad68 Update to version 0.5.0