demandimport: fix level passed to loader of sub-modules
As the fromlist gives the names of sub-modules, they should be searched in
the parent directory of the package's __init__.py, which is level=1.
I got the following error by rewriting hgweb to use absolute_import, where
the "mercurial" package is referenced as ".." (level=2):
ValueError: Attempted relative import beyond toplevel package
I know little about the import mechanism, but this change seems correct.
Before this patch, the following code did import the os module with no error:
from mercurial import demandimport
demandimport.enable()
from mercurial import os
print os.name
--- a/mercurial/demandimport.py Sat Nov 07 17:43:20 2015 +0900
+++ b/mercurial/demandimport.py Sun Nov 01 21:19:09 2015 +0900
@@ -164,7 +164,7 @@
# The name of the module the import statement is located in.
globalname = globals.get('__name__')
- def processfromitem(mod, attr, **kwargs):
+ def processfromitem(mod, attr):
"""Process an imported symbol in the import statement.
If the symbol doesn't exist in the parent module, it must be a
@@ -172,7 +172,7 @@
"""
symbol = getattr(mod, attr, nothing)
if symbol is nothing:
- symbol = _demandmod(attr, mod.__dict__, locals, **kwargs)
+ symbol = _demandmod(attr, mod.__dict__, locals, level=1)
setattr(mod, attr, symbol)
# Record the importing module references this symbol so we can
@@ -194,7 +194,7 @@
mod = _hgextimport(_origimport, name, globals, locals, level=level)
for x in fromlist:
- processfromitem(mod, x, level=level)
+ processfromitem(mod, x)
return mod