view hgweb.cgi @ 15860:3ecce805ac13

largefiles: correctly download new largefiles when merging

There is a bug in the merge process where, if a new largefile is introduced
in a merge and the user does not have that largefile in his repo's local store
nor in his system cache, the working copy will retain the old largefile.  Upon
the commit of the merge, the standin is re-written to contain the hash of the
old largefile, and the lfdirstate retains a "Modified" status for the file.
The end result is that the largefile can show up in the merge commit as
"Modified", but the standin has no diff.  This is wrong in two ways:

  1) Such a "wedged" history with a nonsense change in a commit should not be
      possible
  2) It effectively reverts a largefile to an old version when doing a merge

This is caused by the fact that the updatelfiles() command always checks the
current largefile's hash against the hash stored in the current node's standin.
This is correct behavior in every case except for a merge.  When merging, we
must assume that the standin in the working copy contains the correct hash,
because the original hg.merge() has already updated it for us.

This patch fixes the issue by patching the repo object to carry a "_ismerging"
attribute, that the updatelfiles() command checks for.  When this attribute is
found, it checks against the working copy's standin, rather than the standin
in the current node.

#!/usr/bin/env python
#
# An example hgweb CGI script, edit as necessary
# See also http://mercurial.selenic.com/wiki/PublishingRepositories

# Path to repo or hgweb config to serve (see 'hg help hgweb')
config = "/path/to/repo/or/config"

# Uncomment and adjust if Mercurial is not installed system-wide
# (consult "installed modules" path from 'hg debuginstall'):
#import sys; sys.path.insert(0, "/path/to/python/lib")

# Uncomment to send python tracebacks to the browser if an error occurs:
#import cgitb; cgitb.enable()

from mercurial import demandimport; demandimport.enable()
from mercurial.hgweb import hgweb, wsgicgi
application = hgweb(config)
wsgicgi.launch(application)