$ git clone -n https://src.fedoraproject.org/rpms/rust-nix0.14.git /var/lib/mock/f39-build-1833921-41902/root/chroot_tmpdir/scmroot/rust-nix0.14
Cloning into '/var/lib/mock/f39-build-1833921-41902/root/chroot_tmpdir/scmroot/rust-nix0.14'...
$ git fetch origin 455b64889c1e5d6623b3685049520d84cefd454e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-nix0.14
 * [new ref]         455b64889c1e5d6623b3685049520d84cefd454e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 455b648 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild