chrome/installer/linux/debian/calculate_package_deps.py

#!/usr/bin/env python
# Copyright 2017 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Given a binary, uses dpkg-shlibdeps to check that its package dependencies
are satisfiable on all supported debian-based distros.
"""

from __future__ import print_function

import argparse
import json
import os
import re
import subprocess
import sys

import deb_version
import package_version_interval

parser = argparse.ArgumentParser()
parser.add_argument('binary')
parser.add_argument('sysroot')
parser.add_argument('arch')
parser.add_argument('dep_filename')
parser.add_argument('--distro-check', action='store_true')
args = parser.parse_args()

binary = os.path.abspath(args.binary)
sysroot = os.path.abspath(args.sysroot)
arch = args.arch
dep_filename = os.path.abspath(args.dep_filename)
distro_check = args.distro_check

script_dir = os.path.dirname(os.path.realpath(__file__))
dpkg_shlibdeps = os.path.join(script_dir, '..', '..', '..', '..', 'third_party',
                              'dpkg-shlibdeps', 'dpkg-shlibdeps.pl')

cmd = [dpkg_shlibdeps, '--ignore-weak-undefined']
if arch == 'x64':
  cmd.extend(['-l%s/usr/lib/x86_64-linux-gnu' % sysroot,
              '-l%s/lib/x86_64-linux-gnu' % sysroot])
elif arch == 'x86':
  cmd.extend(['-l%s/usr/lib/i386-linux-gnu' % sysroot,
              '-l%s/lib/i386-linux-gnu' % sysroot])
elif arch == 'arm':
  cmd.extend(['-l%s/usr/lib/arm-linux-gnueabihf' % sysroot,
              '-l%s/lib/arm-linux-gnueabihf' % sysroot])
elif arch == 'arm64':
  cmd.extend(['-l%s/usr/lib/aarch64-linux-gnu' % sysroot,
              '-l%s/lib/aarch64-linux-gnu' % sysroot])
elif arch == 'mipsel':
  cmd.extend(['-l%s/usr/lib/mipsel-linux-gnu' % sysroot,
              '-l%s/lib/mipsel-linux-gnu' % sysroot])
elif arch == 'mips64el':
  cmd.extend(['-l%s/usr/lib/mips64el-linux-gnuabi64' % sysroot,
              '-l%s/lib/mips64el-linux-gnuabi64' % sysroot])
else:
  print('Unsupported architecture ' + arch)
  sys.exit(1)
cmd.extend(['-l%s/usr/lib' % sysroot, '-O', '-e', binary])

proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE,
                        cwd=sysroot)
(stdout, stderr) = proc.communicate()
exit_code = proc.wait()
if exit_code != 0:
  print('dpkg-shlibdeps failed with exit code ' + str(exit_code))
  print('stderr was ' + stderr)
  sys.exit(1)

stdout = stdout.decode('utf8')
SHLIBS_DEPENDS_PREFIX = 'shlibs:Depends='
deps_str = ''
for line in stdout.split('\n'):
  if line.startswith(SHLIBS_DEPENDS_PREFIX):
    deps_str = line[len(SHLIBS_DEPENDS_PREFIX):]
deps = deps_str.split(', ')
interval_sets = []
if deps_str != '':
  for dep in deps:
    interval_set = package_version_interval.parse_interval_set(dep)
    # Chrome depends on libgcc_s, is from the package libgcc1.  However, in
    # Bullseye, the package was renamed to libgcc-s1.  To avoid adding a dep
    # on the newer package, this hack skips the dep.  This is safe because
    # libgcc-s1 is a dependency of libc6.  This hack can be removed once
    # support for Debian Buster and Ubuntu Bionic are dropped.
    if interval_set.intervals[0].package == 'libgcc-s1':
      assert len(interval_set.intervals) == 1
      interval = interval_set.intervals[0]
      # Ensure there's not a maximum version.
      assert interval.end == (
          package_version_interval.PackageVersionIntervalEndpoint(
              True, None, None))
      # The GCC version in Ubuntu Trusty is 4.8, so use that as the minimum.
      assert interval.contains(deb_version.DebVersion('4.8'))
      continue
    interval_sets.append(interval_set)

script_dir = os.path.dirname(os.path.abspath(__file__))
deps_file = os.path.join(script_dir, 'dist_package_versions.json')
distro_package_versions = json.load(open(deps_file))

ret_code = 0
if distro_check:
  for distro in distro_package_versions:
    for interval_set in interval_sets:
      dep_satisfiable = False
      for interval in interval_set.intervals:
        package = interval.package
        if package not in distro_package_versions[distro]:
          continue
        distro_version = deb_version.DebVersion(
            distro_package_versions[distro][package])
        if interval.contains(distro_version):
          dep_satisfiable = True
          break
      if not dep_satisfiable:
        print(
            'Dependency %s not satisfiable on distro %s caused by binary %s' % (
                interval_set.formatted(), distro, os.path.basename(binary)),
            file=sys.stderr)
        ret_code = 1
if ret_code == 0:
  with open(dep_filename, 'w') as dep_file:
    lines = [interval_set.formatted() + '\n'
           for interval_set in interval_sets]
    dep_file.write(''.join(sorted(lines)))
sys.exit(ret_code)