$ git clone -n https://src.fedoraproject.org/rpms/rust-zstd.git /var/lib/mock/f40-build-2270200-54794/root/chroot_tmpdir/scmroot/rust-zstd
Cloning into '/var/lib/mock/f40-build-2270200-54794/root/chroot_tmpdir/scmroot/rust-zstd'...
$ git fetch origin 93ddca1da36f6ce444a65c742d31f923128fe98c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-zstd
 * [new ref]         93ddca1da36f6ce444a65c742d31f923128fe98c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 93ddca1 Update to version 0.13.0; Fixes RHBZ#2243312