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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def git_list_refs(repo_dir):
 """List references available in the local repo with commit ids. This is similar to ls-remote, but shows the *local* refs. Return format: .. code-block:: python {<ref1>: <commit_hash1>, <ref2>: <commit_hash2>, <refN>: <commit_hashN>, } """

    command = ['git', 'show-ref', '--dereference', '--head']
    raw = execute_git_command(command, repo_dir=repo_dir).splitlines()
    output = [l.strip() for l in raw if l.strip()]
    return {ref: commit_hash for commit_hash, ref in
            [l.split(None, 1) for l in output]}