$ git clone -n https://src.fedoraproject.org/rpms/rust-ff.git /var/lib/mock/epel9-build-59178085-6571538/root/chroot_tmpdir/scmroot/rust-ff
Cloning into '/var/lib/mock/epel9-build-59178085-6571538/root/chroot_tmpdir/scmroot/rust-ff'...
$ git fetch origin 6386665d652e784b14a085d9e22176a19247e6d4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-ff
 * [new ref]         6386665d652e784b14a085d9e22176a19247e6d4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6386665 Update to version 0.13.1; Fixes RHBZ#2351008