$ git clone -n https://src.fedoraproject.org/rpms/rust-nix0.22.git /var/lib/mock/f39-build-1625782-39203/root/chroot_tmpdir/scmroot/rust-nix0.22
Cloning into '/var/lib/mock/f39-build-1625782-39203/root/chroot_tmpdir/scmroot/rust-nix0.22'...
$ git fetch origin 3a84d4175e611678777d74faf1d6a671c402a0cb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-nix0.22
 * [new ref]         3a84d4175e611678777d74faf1d6a671c402a0cb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3a84d41 Regenerate with rust2rpm v24; fix build failure on RHEL 9 kernels