def get_version_from_git()

in python/adbc_driver_manager/adbc_driver_manager/_version.py [0:0]

• 43 lines of code
• 13 McCabe index (conditional complexity)

def get_version_from_git():
    import subprocess

    # git describe --first-parent does not take into account tags from branches
    # that were merged-in. The '--long' flag gets us the 'dev' version and
    # git hash, '--always' returns the git hash even if there are no tags.
    for opts in [["--first-parent"], []]:
        try:
            p = subprocess.Popen(
                ["git", "describe", "--long", "--always"] + opts,
                cwd=package_root,
                stdout=subprocess.PIPE,
                stderr=subprocess.PIPE,
            )
        except OSError:
            return
        if p.wait() == 0:
            break
    else:
        return

    description = (
        p.communicate()[0]
        .decode()
        .strip("v")  # Tags can have a leading 'v', but the version should not
        .rstrip("\n")
        .rsplit("-", 2)  # Split the latest tag, commits since tag, and hash
    )

    try:
        release, dev, git = description
        release = TAG_RELEASE_FORMAT.match(release).group(1)
    except (AttributeError, ValueError):
        # Invalid tag; or no tags, only the git hash
        # prepend 'g' to match with format returned by 'git describe'
        git = "g{}".format(*description)
        # XXX: assume version if not given
        release = "0.0.0"
        dev = None

    labels = []
    if dev == "0":
        dev = None
    else:
        labels.append(git)

    try:
        p = subprocess.Popen(["git", "diff", "--quiet"], cwd=package_root)
    except OSError:
        labels.append("confused")  # This should never happen.
    else:
        if p.wait() == 1:
            labels.append("dirty")

    return Version(release, dev, labels)