Script I use to automatically update 3D Slicer on Linux every night

update_slicer.py

#!/usr/bin/env python

import re
import sys
from pathlib import Path
from sys import platform as _platform
import time
import shutil
import urllib.request
import tarfile
import tempfile

# http://stackoverflow.com/questions/5663980/importerror-no-module-named-beautifulsoup
from bs4 import BeautifulSoup  # pip install beautifulsoup4


def get_latest_slicer_version(directory):
    files = Path(directory).glob('*.ini')
    p = 'Slicer-(\d+)'
    max_revision = 0
    for filepath in files:
        rev = re.findall(p, str(filepath))
        if rev:
            max_revision = max(max_revision, int(rev[0]))
    return str(max_revision)


if __name__ == "__main__":
    temp_dir = Path(tempfile.mkdtemp())
    filepath = temp_dir / 'downloaded_slicer.tar.gz'
    unzipped_dir = temp_dir / 'unzipped'
    slicer_url = 'https://download.slicer.org'
    opt_dir = Path('~/opt/').expanduser()
    namic_dir = Path('~/.config/NA-MIC/').expanduser()

    if len(sys.argv) == 2:
        slicer_bin_dir = Path(sys.argv[1]).expanduser()
    else:
        slicer_bin_dir = opt_dir / 'Slicer' / 'Nightly'

    start_time = time.time()
    print(f'Updating Slicer - {time.ctime()}')

    # Get download URL
    response = urllib.request.urlopen(slicer_url)
    html = response.read()
    parsed = BeautifulSoup(html, features="html.parser")
    o = parsed.findAll('a')

    if _platform == "linux" or _platform == "linux2":  # linux
        button = o[43]
    elif _platform == "darwin":  # MAC OS X
        button = o[42]
    elif _platform == "win32":  # Windows
        button = o[41]

    download_url = slicer_url + button.get('href')

    button_text = button.getText()
    p = r'revision (\d+)'
    revisions = re.findall(p, button_text)
    if not revisions:
        raise RuntimeError(
            f'Error retrieving revision number. Button text:\n{button_text}')
    revision_number_string = revisions[0]

    # Download
    print('Downloading nightly build number {} from {}...'.format(
        revision_number_string, download_url))

    # Set the URL
    response = urllib.request.urlopen(download_url)

    # Download the data
    html = response.read()

    # Write
    with open(filepath, 'wb') as f:
        f.write(html)

    # Extract
    tar = tarfile.open(filepath, "r:gz")
    tar.extractall(unzipped_dir)
    tar.close()
    unzipped_slicer_dir = unzipped_dir / list(unzipped_dir.iterdir())[0]
    print(unzipped_slicer_dir)

    # Delete installed version
    if slicer_bin_dir.is_dir():
        print('Removing', slicer_bin_dir)
        shutil.rmtree(slicer_bin_dir)

    # Install downloaded version
    print('Moving', unzipped_slicer_dir)
    print('to', slicer_bin_dir)
    shutil.move(unzipped_slicer_dir, slicer_bin_dir)

    # TODO: config file
    config_filename = f'Slicer-{revision_number_string}.ini'
    max_revision = get_latest_slicer_version(namic_dir)

    # Cleanup
    shutil.rmtree(temp_dir)

    end_time = int(time.time() - start_time)
    m, s = divmod(end_time, 60)
    print(f'Operation finished in {m} minutes and {s} seconds.\n\n')

namicDir = '/home/fernando/.config/NA-MIC/' shall be namicDir = os.path.join(os.path.expanduser('~'),'.config','NA-MIC')

This is the script I use :)

But sure, I'll change that.