$ git clone -n https://src.fedoraproject.org/rpms/rust-nix0.20.git /var/lib/mock/f40-build-2082882-49873/root/chroot_tmpdir/scmroot/rust-nix0.20
Cloning into '/var/lib/mock/f40-build-2082882-49873/root/chroot_tmpdir/scmroot/rust-nix0.20'...
$ git fetch origin 01c674d98b4609368196752099114b9a75ac9867:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-nix0.20
 * [new ref]         01c674d98b4609368196752099114b9a75ac9867 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 01c674d Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild