$ git clone -n https://src.fedoraproject.org/rpms/rust-fs-err.git /var/lib/mock/f38-build-side-43-rust-devel-1415161-31454/root/chroot_tmpdir/scmroot/rust-fs-err
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1415161-31454/root/chroot_tmpdir/scmroot/rust-fs-err'...
$ git fetch origin 4b17726e175912edaea8d59cc09ac061cd511f10:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-fs-err
 * [new ref]         4b17726e175912edaea8d59cc09ac061cd511f10 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4b17726 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild