$ git clone -n https://src.fedoraproject.org/rpms/rust-gix-object.git /var/lib/mock/f40-build-737409-13289/root/chroot_tmpdir/scmroot/rust-gix-object
Cloning into '/var/lib/mock/f40-build-737409-13289/root/chroot_tmpdir/scmroot/rust-gix-object'...
$ git fetch origin a173df1837f7a7779e69b17548707954b4a7eaca:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gix-object
 * [new ref]         a173df1837f7a7779e69b17548707954b4a7eaca -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a173df1 Update to version 0.42.1 (rhbz#2253237)