$ git clone -n https://src.fedoraproject.org/rpms/rust-language-tags.git /var/lib/mock/f40-build-2062605-49167/root/chroot_tmpdir/scmroot/rust-language-tags
Cloning into '/var/lib/mock/f40-build-2062605-49167/root/chroot_tmpdir/scmroot/rust-language-tags'...
$ git fetch origin e3b550b75098d596709dce8d8caa9fe5eb2d7721:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-language-tags
 * [new ref]         e3b550b75098d596709dce8d8caa9fe5eb2d7721 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e3b550b Regenerate with rust2rpm v24