check_exists.py

#!/usr/bin/env python
# Mon 26 Feb 11:11:30 2018 CET

# Checks if the combination of package-name, version and build number already
# exist on the provided channel. If so, exits with 0 - otherwise, non-zero.

import os
import re
import sys
import yaml
import subprocess
from conda.exports import get_index


def check_on_channel(channel_url, name, version, build_number):
  """Checks on the given channel if a package with the specs exist"""

  # get the channel index
  print('Retrieving conda channel index (%s)...' % channel_url)
  index = get_index(channel_urls=[channel_url], prepend=False)

  # search if package with the same version/py_ver/build_number exists
  print('Checking for %s-%s_*_%s...' % (name, version, build_number))
  urls = []
  for dist in index:
    #print('checking %s-%s_%s' % (dist.name, dist.version, dist.build_string))
    if dist.name == name and \
        dist.version == version and \
        dist.build_string.endswith('_%s' % build_number):
      print('Found matching package (%s-%s_%s)' % \
          (dist.name, dist.version, dist.build_string))
      return True

  print('No matches found among %d packages' % len(index))
  return False


def get_rendered_recipe(build_config, path):

  print('Rendering conda recipe (%s)...' % path)

  conda=os.path.join(os.path.dirname(sys.executable), 'conda')

  cmd = [conda, 'render', '--variant-config-files', build_config, path]
  print('$ %s' % ' '.join(cmd))

  from conda_build.api import get_or_merge_config, render, output_yaml
  config = get_or_merge_config(None, variant_config_files=build_config)
  metadata = render(path, config=config)
  output = output_yaml(metadata[0][0])
  return yaml.load(output)


def main():

  parsed = get_rendered_recipe(sys.argv[1], sys.argv[2])
  if parsed is not None:
    if check_on_channel(sys.argv[3], parsed['package']['name'],
        parsed['package']['version'], parsed['build']['number']):
      sys.exit(0)
  else:
    print('Recipe %s is not enabled for the current architecture' % sys.argv[2])
    sys.exit(0)

  sys.exit(1)


if __name__ == '__main__':
  if len(sys.argv) != 4:
    print('usage: %s build-config recipe-dir channel' % sys.argv[0])
    sys.exit(1)
  main()