$ git clone -n https://src.fedoraproject.org/rpms/rust-rustfix.git /var/lib/mock/f39-build-1469228-33835/root/chroot_tmpdir/scmroot/rust-rustfix
Cloning into '/var/lib/mock/f39-build-1469228-33835/root/chroot_tmpdir/scmroot/rust-rustfix'...
$ git fetch origin 5a3d96435068dc9af27930e5e5285f19b31ec4c6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rustfix
 * [new ref]         5a3d96435068dc9af27930e5e5285f19b31ec4c6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5a3d964 Regenerate with rust2rpm v24