Bug: git-p4: Sometimes p4 generates Windows-style output on OS X

[David Foster <davidfstr@gmail.com>]

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I've observed that the p4 command that git-p4 delegates to occasionally 
outputs Windows-style line endings even on the OS X platform. When this 
happens, git-p4 gets very confused and crashes out.

I've attached a patch which seems to fix the issue in my case. Now this 
patch is a pretty bad hack, and I don't recommend that it be accepted 
as-is. It is just a starting point.

A real fix would determine in advance whether Perforce was going to emit 
Windows-style output. Since I don't know the circumstances under which 
this happens on non-Windows platforms, I can't provide a better patch. 
Someone who has intimate knowledge of p4's operating modes would be best 
to examine what's really going on with p4.

P.S. In case it matters, I am not subscribed to this mailing list, so 
you will need to CC me for any replies to reach me.

---
David Foster
http://dafoster.net/

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>From aef963f0c45dea81f3e6f30d3b4185a0983ca4de Mon Sep 17 00:00:00 2001
From: David Foster <davidfstr@gmail.com>
Date: Mon, 6 May 2013 10:50:01 -0700
Subject: [PATCH] Compensate for Windows-style output from the p4 command on
 non-Windows systems.

---
 git-p4.py |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/git-p4.py b/git-p4.py
index 647f110..949d66d 100755
--- a/git-p4.py
+++ b/git-p4.py
@@ -1454,6 +1454,24 @@ class P4Submit(Command, P4UserMap):
             tmpFile = open(fileName, "rb")
             message = tmpFile.read()
             tmpFile.close()
+            
+            # HACK: If Perforce spontaneously generates Windows-style output,
+            #       compensate by assuming the entire p4 command went into
+            #       Windows mode.
+            if separatorLine not in message:
+                print "WARNING: Perforce has spontaneously decided to generate Windows-style output. Compensating."
+                
+                # Assume that Perforce is now inexplicably operating in Windows mode
+                self.isWindows = True
+                
+                # Retroactively rewrite expected output
+                submitTemplate = submitTemplate.replace("\n", "\r\n")
+                separatorLine = separatorLine.replace("\n", "\r\n")
+                newdiff = newdiff.replace("\n", "\r\n")
+                
+                if separatorLine not in message:
+                    raise ValueError('Confused. Thought Perforce went into Windows mode but apparently something else is wrong.')
+            
             submitTemplate = message[:message.index(separatorLine)]
             if self.isWindows:
                 submitTemplate = submitTemplate.replace("\r\n", "\n")
-- 
1.7.7.5 (Apple Git-26)