$ git clone -n https://src.fedoraproject.org/rpms/rust-ssh-key-dir.git /var/lib/mock/f40-build-2497665-61664/root/chroot_tmpdir/scmroot/rust-ssh-key-dir
Cloning into '/var/lib/mock/f40-build-2497665-61664/root/chroot_tmpdir/scmroot/rust-ssh-key-dir'...
$ git fetch origin 8cadddf84d6bc13d6977675eaefaef6e0a35ebf6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-ssh-key-dir
 * [new ref]         8cadddf84d6bc13d6977675eaefaef6e0a35ebf6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8cadddf Update Rust macro usage