genosxversion: don't give up if we can't find a path to hg libraries

This doesn't work if you have a PyOxidized hg on $PATH, but everything
is fine if you just ignore that problem.

Differential Revision: https://phab.mercurial-scm.org/D8975

contrib/genosxversion.py

@@ -1,136 +1,141
 #!/usr/bin/env python2
 from __future__ import absolute_import, print_function
 
 import argparse
 import os
 import subprocess
 import sys
 
-# Always load hg libraries from the hg we can find on $PATH.
-hglib = subprocess.check_output(['hg', 'debuginstall', '-T', '{hgmodules}'])
-sys.path.insert(0, os.path.dirname(hglib))
+try:
+    # Always load hg libraries from the hg we can find on $PATH.
+    hglib = subprocess.check_output(['hg', 'debuginstall', '-T', '{hgmodules}'])
+    sys.path.insert(0, os.path.dirname(hglib))
+except subprocess.CalledProcessError:
+    # We're probably running with a PyOxidized Mercurial, so just
+    # proceed and hope it works out okay.
+    pass
 
 from mercurial import util
 
 ap = argparse.ArgumentParser()
 ap.add_argument(
     '--paranoid',
     action='store_true',
     help=(
         "Be paranoid about how version numbers compare and "
         "produce something that's more likely to sort "
         "reasonably."
     ),
 )
 ap.add_argument('--selftest', action='store_true', help='Run self-tests.')
 ap.add_argument('versionfile', help='Path to a valid mercurial __version__.py')
 
 
 def paranoidver(ver):
     """Given an hg version produce something that distutils can sort.
 
     Some Mac package management systems use distutils code in order to
     figure out upgrades, which makes life difficult. The test case is
     a reduced version of code in the Munki tool used by some large
     organizations to centrally manage OS X packages, which is what
     inspired this kludge.
 
     >>> paranoidver('3.4')
     '3.4.0'
     >>> paranoidver('3.4.2')
     '3.4.2'
     >>> paranoidver('3.0-rc+10')
     '2.9.9999-rc+10'
     >>> paranoidver('4.2+483-5d44d7d4076e')
     '4.2.0+483-5d44d7d4076e'
     >>> paranoidver('4.2.1+598-48d1e1214d8c')
     '4.2.1+598-48d1e1214d8c'
     >>> paranoidver('4.3-rc')
     '4.2.9999-rc'
     >>> paranoidver('4.3')
     '4.3.0'
     >>> from distutils import version
     >>> class LossyPaddedVersion(version.LooseVersion):
     ...     '''Subclass version.LooseVersion to compare things like
     ...     "10.6" and "10.6.0" as equal'''
     ...     def __init__(self, s):
     ...             self.parse(s)
     ...
     ...     def _pad(self, version_list, max_length):
     ...         'Pad a version list by adding extra 0 components to the end'
     ...         # copy the version_list so we don't modify it
     ...         cmp_list = list(version_list)
     ...         while len(cmp_list) < max_length:
     ...             cmp_list.append(0)
     ...         return cmp_list
     ...
     ...     def __cmp__(self, other):
     ...         if isinstance(other, str):
     ...             other = MunkiLooseVersion(other)
     ...         max_length = max(len(self.version), len(other.version))
     ...         self_cmp_version = self._pad(self.version, max_length)
     ...         other_cmp_version = self._pad(other.version, max_length)
     ...         return cmp(self_cmp_version, other_cmp_version)
     >>> def testver(older, newer):
     ...   o = LossyPaddedVersion(paranoidver(older))
     ...   n = LossyPaddedVersion(paranoidver(newer))
     ...   return o < n
     >>> testver('3.4', '3.5')
     True
     >>> testver('3.4.0', '3.5-rc')
     True
     >>> testver('3.4-rc', '3.5')
     True
     >>> testver('3.4-rc+10-deadbeef', '3.5')
     True
     >>> testver('3.4.2', '3.5-rc')
     True
     >>> testver('3.4.2', '3.5-rc+10-deadbeef')
     True
     >>> testver('4.2+483-5d44d7d4076e', '4.2.1+598-48d1e1214d8c')
     True
     >>> testver('4.3-rc', '4.3')
     True
     >>> testver('4.3', '4.3-rc')
     False
     """
     major, minor, micro, extra = util.versiontuple(ver, n=4)
     if micro is None:
         micro = 0
     if extra:
         if extra.startswith('rc'):
             if minor == 0:
                 major -= 1
                 minor = 9
             else:
                 minor -= 1
             micro = 9999
             extra = '-' + extra
         else:
             extra = '+' + extra
     else:
         extra = ''
     return '%d.%d.%d%s' % (major, minor, micro, extra)
 
 
 def main(argv):
     opts = ap.parse_args(argv[1:])
     if opts.selftest:
         import doctest
 
         doctest.testmod()
         return
     with open(opts.versionfile) as f:
         for l in f:
             if l.startswith('version = b'):
                 # version number is entire line minus the quotes
                 ver = l[len('version = b') + 1 : -2]
                 break
     if opts.paranoid:
         print(paranoidver(ver))
     else:
         print(ver)
 
 
 if __name__ == '__main__':
     main(sys.argv)