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Mercurial Hosting with mod_wsgi

30 Aug, 2008

If you choose to host a set of mercurial repositories using mod_wsgi you will probably his this exception:

mod_wsgi (pid=2189): Exception occurred processing WSGI script 'script/hgweb.wsgi'.
Traceback (most recent call last):
  File "python2.5/site-packages/mercurial/hgweb/hgwebdir_mod.py", line 73, in __call__
    return self.run_wsgi(req)
  File "python2.5/site-packages/mercurial/hgweb/hgwebdir_mod.py", line 98, in run_wsgi
    req.write(self.makeindex(req, tmpl))
  File "python2.5/site-packages/mercurial/hgweb/request.py", line 84, in write
    for part in thing:
  File "python2.5/site-packages/mercurial/templater.py", line 137, in __call__
    item = iters[0].next()
  File "python2.5/site-packages/mercurial/templater.py", line 120, in _process
    for i in v:
  File "python2.5/site-packages/mercurial/hgweb/hgwebdir_mod.py", line 175, in entries
    u.warn(_('error reading %s/.hg/hgrc: %s\\n' % (path, e)))
  File "python2.5/site-packages/mercurial/ui.py", line 443, in warn
    self.write_err(*msg)
  File "python2.5/site-packages/mercurial/ui.py", line 386, in write_err
    if not sys.stdout.closed: sys.stdout.flush()
IOError: sys.stdout access restricted by mod_wsgi

If you just change these lines in mercurial/ui.py around 386 from this:

def write_err(self, *args):
    try:
        if not sys.stdout.closed: sys.stdout.flush()
        for a in args:
            sys.stderr.write(str(a))
        # stderr may be buffered under win32 when redirected to files,
        # including stdout.
        if not sys.stderr.closed: sys.stderr.flush()
    except IOError, inst:
        if inst.errno != errno.EPIPE:
            raise

So that the Except clause at the end looks like this:

except IOError, inst:
    if not (inst.errno == errno.EPIPE or "access restricted by mod_wsgi" in str(inst)):
        raise

Then everything seems to work nicely.