$ git clone -n https://src.fedoraproject.org/rpms/rust-gix-pack.git /var/lib/mock/f40-build-1807603-24881/root/chroot_tmpdir/scmroot/rust-gix-pack
Cloning into '/var/lib/mock/f40-build-1807603-24881/root/chroot_tmpdir/scmroot/rust-gix-pack'...
$ git fetch origin 6bfc260db7c0f64b05c91c18112d38897b0ebe92:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gix-pack
 * [new ref]         6bfc260db7c0f64b05c91c18112d38897b0ebe92 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6bfc260 Update to version 0.51.1 (rhbz#2299578)