$ git clone -n https://src.fedoraproject.org/rpms/rust-zstd.git /var/lib/mock/f39-build-1802429-41809/root/chroot_tmpdir/scmroot/rust-zstd
Cloning into '/var/lib/mock/f39-build-1802429-41809/root/chroot_tmpdir/scmroot/rust-zstd'...
$ git fetch origin 2b3de32ee523650bd82236a334267675a7c12bc7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-zstd
 * [new ref]         2b3de32ee523650bd82236a334267675a7c12bc7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2b3de32 Update to version 0.12.4; Fixes RHBZ#2224018