[issue3121] hgdiff fail in Mercurial 2.0

[Wayne]

New submission from Wayne <goto100 at gmail.com>:

OS: Windows 7 64bit

Python: 2.6

Mercurial: 2.0

My hgrc:

[extdiff]
cmd.vimdiff = gvim
opts.vimdiff = --noplugin -d -R

when I run "hg vimdiff path/to/somefile.js" the cmd window show:

abort: : c:\users\myusername\appdata\local\temp\extdiff.somerandomchars

and the vimdiff can't fetch the source file in this folder, the diff fail.

bug in Mercurial 1.9, It's OK.

I debug the source code, I found the differents between 1.9 and 2.0 in
extdiff.py line 225:

        util.system(cmdline, cwd=tmproot, out=ui.fout)

in 2.0, ui.fout == sys.__stdout__, so in mercurial/util.py line 426,
mercurial opened a new subprocess to run the command, the main process exit,
delete the diff file, after that, open the vimdiff. at that time, the file
is already deleted, the bug shows.

in 1.9, ui.fout != sys.__stdout__, there is no bug.

as now, I rollback my mercurial to 1.9, I hope a patch will release soon.

----------
messages: 18136
nosy: goto100
priority: bug
status: unread
title: hgdiff fail in Mercurial 2.0

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