demandimport: do not raise ImportError for unknown item in fromlist
This is the behavior of the default __import__() function, which doesn't
validate the existence of the fromlist items. Later on, the missing attribute
is detected while processing the import statement.
https://hg.python.org/cpython/file/v2.7.13/Python/import.c#l2575
The comtypes library relies on this (maybe) undocumented behavior, and we
got a bug report to TortoiseHg, sigh.
https://bitbucket.org/tortoisehg/thg/issues/4647/
The test added at
26a4e46af2bc verifies the behavior of the import statement,
so this patch only adds the test of __import__() function and works around
CPython/PyPy difference.
#require no-msys # MSYS will translate web paths as if they were file paths
This tests if CGI files from after d0db3462d568 but
before d74fc8dec2b4 still work.
$ hg init test
$ cat >hgweb.cgi <<HGWEB
> #!/usr/bin/env python
> #
> # An example CGI script to use hgweb, edit as necessary
>
> import cgitb
> cgitb.enable()
>
> from mercurial import demandimport; demandimport.enable()
> from mercurial.hgweb import hgweb
> from mercurial.hgweb import wsgicgi
> from mercurial.hgweb.request import wsgiapplication
>
> def make_web_app():
> return hgweb("test", "Empty test repository")
>
> wsgicgi.launch(wsgiapplication(make_web_app))
> HGWEB
$ chmod 755 hgweb.cgi
$ cat >hgweb.config <<HGWEBDIRCONF
> [paths]
> test = test
> HGWEBDIRCONF
$ cat >hgwebdir.cgi <<HGWEBDIR
> #!/usr/bin/env python
> #
> # An example CGI script to export multiple hgweb repos, edit as necessary
>
> import cgitb
> cgitb.enable()
>
> from mercurial import demandimport; demandimport.enable()
> from mercurial.hgweb import hgwebdir
> from mercurial.hgweb import wsgicgi
> from mercurial.hgweb.request import wsgiapplication
>
> def make_web_app():
> return hgwebdir("hgweb.config")
>
> wsgicgi.launch(wsgiapplication(make_web_app))
> HGWEBDIR
$ chmod 755 hgwebdir.cgi
$ . "$TESTDIR/cgienv"
$ python hgweb.cgi > page1
$ python hgwebdir.cgi > page2
$ PATH_INFO="/test/"
$ PATH_TRANSLATED="/var/something/test.cgi"
$ REQUEST_URI="/test/test/"
$ SCRIPT_URI="http://hg.omnifarious.org/test/test/"
$ SCRIPT_URL="/test/test/"
$ python hgwebdir.cgi > page3
$ grep -i error page1 page2 page3
[1]