$ git clone -n https://src.fedoraproject.org/rpms/rust-userfaultfd.git /var/lib/mock/f39-build-1501206-34826/root/chroot_tmpdir/scmroot/rust-userfaultfd
Cloning into '/var/lib/mock/f39-build-1501206-34826/root/chroot_tmpdir/scmroot/rust-userfaultfd'...
$ git fetch origin ffa9ecac913d265cf679d7ffef97897212d48ff1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-userfaultfd
 * [new ref]         ffa9ecac913d265cf679d7ffef97897212d48ff1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ffa9eca Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild