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ORIG_HEAD is the previous HEAD, so it is not what we are after. HEAD only contains the hash if we are in a detached head situation, otherwise it will contain a ref and we need to resolve it. `git rev-parse HEAD` should work as well but hits an issue with git's new `safe.directory` setting, I have not found a way to set this parameter for a signle call. For toolchain packages are built with catalyst, and the HEAD value needs to pre-resolved because we do not have access to the whole git repository. So build_toolchains will need to inject the correct HEAD file contents.