src/buildstream/_version.py [298:335]:
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    if rc != 0 or branch_name is None:
        raise NotThisMethod("'git rev-parse --abbrev-ref' returned error")
    branch_name = branch_name.strip()

    if branch_name == "HEAD":
        # If we aren't exactly on a branch, pick a branch which represents
        # the current commit. If all else fails, we are on a branchless
        # commit.
        branches, rc = runner(GITS, ["branch", "--contains"], cwd=root)
        # --contains was added in git-1.5.4
        if rc != 0 or branches is None:
            raise NotThisMethod("'git branch --contains' returned error")
        branches = branches.split("\n")

        # Remove the first line if we're running detached
        if "(" in branches[0]:
            branches.pop(0)

        # Strip off the leading "* " from the list of branches.
        branches = [branch[2:] for branch in branches]
        if "master" in branches:
            branch_name = "master"
        elif not branches:
            branch_name = None
        else:
            # Pick the first branch that is returned. Good or bad.
            branch_name = branches[0]

    pieces["branch"] = branch_name

    # parse describe_out. It will be like TAG-NUM-gHEX[-dirty] or HEX[-dirty]
    # TAG might have hyphens.
    git_describe = describe_out

    # look for -dirty suffix
    dirty = git_describe.endswith("-dirty")
    pieces["dirty"] = dirty
    if dirty:
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versioneer.py [1276:1313]:
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    if rc != 0 or branch_name is None:
        raise NotThisMethod("'git rev-parse --abbrev-ref' returned error")
    branch_name = branch_name.strip()

    if branch_name == "HEAD":
        # If we aren't exactly on a branch, pick a branch which represents
        # the current commit. If all else fails, we are on a branchless
        # commit.
        branches, rc = runner(GITS, ["branch", "--contains"], cwd=root)
        # --contains was added in git-1.5.4
        if rc != 0 or branches is None:
            raise NotThisMethod("'git branch --contains' returned error")
        branches = branches.split("\n")

        # Remove the first line if we're running detached
        if "(" in branches[0]:
            branches.pop(0)

        # Strip off the leading "* " from the list of branches.
        branches = [branch[2:] for branch in branches]
        if "master" in branches:
            branch_name = "master"
        elif not branches:
            branch_name = None
        else:
            # Pick the first branch that is returned. Good or bad.
            branch_name = branches[0]

    pieces["branch"] = branch_name

    # parse describe_out. It will be like TAG-NUM-gHEX[-dirty] or HEX[-dirty]
    # TAG might have hyphens.
    git_describe = describe_out

    # look for -dirty suffix
    dirty = git_describe.endswith("-dirty")
    pieces["dirty"] = dirty
    if dirty:
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