view mercurial/packagescan.py @ 2328:f789602ba840

hgweb.manifest: revno of manifest and changelog aren't always the same

In the v4l-dvb repo, the manifest revno and the changelog revno are not
in sync.  This happened because the same patch was applied to the same
revision in two different branches, resulting in the same manifest text,
with the same parents and so the first revision was reused.

Since hgweb.manifest was assuming the revnos of the manifest and of the
changelog were always the same, clicking on manifest -> bz2 in the
v4l-dvb site would download the wrong revision.

Use the linkrev to go from manifest revision to changelog revision.

This still won't be perfect since the page will still talk about
"manifest for changeset XYZ", where XYZ was the first changeset to have
this manifest, which is not necessarily the same changeset that the user
clicked to get to this page - but at least the contents will be the
same.

# packagescan.py - Helper module for identifing used modules.
# Used for the py2exe distutil.
# This module must be the first mercurial module imported in setup.py
#
# Copyright 2005 Volker Kleinfeld <[e-mail]>
#
# This software may be used and distributed according to the terms
# of the GNU General Public License, incorporated herein by reference.
import glob
import os
import sys
import ihooks
import types
import string

# Install this module as fake demandload module
sys.modules['mercurial.demandload'] = sys.modules[__name__]

# Requiredmodules contains the modules imported by demandload.
# Please note that demandload can be invoked before the 
# mercurial.packagescan.scan method is invoked in case a mercurial
# module is imported.
requiredmodules = {} 
def demandload(scope, modules):
    """ fake demandload function that collects the required modules 
        foo            import foo
        foo bar        import foo, bar
        foo.bar        import foo.bar
        foo:bar        from foo import bar
        foo:bar,quux   from foo import bar, quux
        foo.bar:quux   from foo.bar import quux"""

    for m in modules.split():
        mod = None
        try:
            module, fromlist = m.split(':')
            fromlist = fromlist.split(',')
        except:
            module = m
            fromlist = []
        mod = __import__(module, scope, scope, fromlist)
        if fromlist == []:
            # mod is only the top package, but we need all packages
            comp = module.split('.')
            i = 1
            mn = comp[0]
            while True:
                # mn and mod.__name__ might not be the same
                scope[mn] = mod
                requiredmodules[mod.__name__] = 1
                if len(comp) == i: break
                mod = getattr(mod,comp[i]) 
                mn = string.join(comp[:i+1],'.')
                i += 1
        else:
            # mod is the last package in the component list
            requiredmodules[mod.__name__] = 1
            for f in fromlist:
                scope[f] = getattr(mod,f)
                if type(scope[f]) == types.ModuleType:
                    requiredmodules[scope[f].__name__] = 1

def scan(libpath,packagename):
    """ helper for finding all required modules of package <packagename> """
    # Use the package in the build directory
    libpath = os.path.abspath(libpath)
    sys.path.insert(0,libpath)
    packdir = os.path.join(libpath,packagename)
    # A normal import would not find the package in
    # the build directory. ihook is used to force the import.
    # After the package is imported the import scope for
    # the following imports is settled.
    p = importfrom(packdir)
    globals()[packagename] = p
    sys.modules[packagename] = p
    # Fetch the python modules in the package
    cwd = os.getcwd()
    os.chdir(packdir)
    pymodulefiles = glob.glob('*.py')
    extmodulefiles = glob.glob('*.pyd')
    os.chdir(cwd)
    # Import all python modules and by that run the fake demandload
    for m in pymodulefiles:
        if m == '__init__.py': continue
        tmp = {}
        mname,ext = os.path.splitext(m)
        fullname = packagename+'.'+mname
        __import__(fullname,tmp,tmp)
        requiredmodules[fullname] = 1
    # Import all extension modules and by that run the fake demandload
    for m in extmodulefiles:
        tmp = {}
        mname,ext = os.path.splitext(m)
        fullname = packagename+'.'+mname
        __import__(fullname,tmp,tmp)
        requiredmodules[fullname] = 1

def getmodules():
    return requiredmodules.keys()

def importfrom(filename):
    """
    import module/package from a named file and returns the module.
    It does not check on sys.modules or includes the module in the scope.
    """
    loader = ihooks.BasicModuleLoader()
    path, file = os.path.split(filename)
    name, ext  = os.path.splitext(file)
    m = loader.find_module_in_dir(name, path)
    if not m:
        raise ImportError, name
    m = loader.load_module(name, m)
    return m