$ git clone -n https://src.fedoraproject.org/rpms/rust-rustix.git /var/lib/mock/f39-build-1651299-40489/root/chroot_tmpdir/scmroot/rust-rustix
Cloning into '/var/lib/mock/f39-build-1651299-40489/root/chroot_tmpdir/scmroot/rust-rustix'...
$ git fetch origin 32cded079126a4049e79528d0099bc7fba3c3be9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rustix
 * [new ref]         32cded079126a4049e79528d0099bc7fba3c3be9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 32cded0 Update to version 0.38.21; Fixes RHBZ#2242860