Re: [PATCH] mergetools/p4merge: Handle /dev/null

[David Aguilar]

On Sat, Oct 27, 2012 at 1:47 AM, Jeremy Morton ad...@game-point.net wrote:
 Sorry to be replying to this so late; I hadn't noticed the post until now!

 I've tried putting that code in my p4merge script and yes it does indeed
 work fine.  However, it puts a temporary file in the working directory which
 I'm not sure is a good idea?  If we look at this patch which actually solved
 pretty much the same problem, but when merging and, during a merge conflict,
 a file was created in both branches:
 https://github.com/git/git/commit/ec245ba

 ... it is creating a temp file in a proper temp dir, rather than in the
 working dir.  I think that would be the proper solution here.  However, I
 really want to get this fixed so I'd be happy for this band-aid fix of the
 p4merge script to be checked in until we could get a patch more like the
 aforementioned one, at a later date, to create empty files in a proper temp
 dir and pass them as $LOCAL and $REMOTE.  :-)

I had the same thoughts when I wrote it, but I figured that following
the existing pattern used by mergetool for $REMOTE and $LOCAL when
they do exist was simpler as the first step.

I have a patch that fixes this by using mktemp that I will send shortly.
It only does it for the /dev/null file since the existing behavior for
files that do exist is fine.
-- 
David
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Re: [PATCH] mergetools/p4merge: Handle /dev/null

[Jeremy Morton]

Sorry to be replying to this so late; I hadn't noticed the post until now!

I've tried putting that code in my p4merge script and yes it does indeed 
work fine.  However, it puts a temporary file in the working directory 
which I'm not sure is a good idea?  If we look at this patch which 
actually solved pretty much the same problem, but when merging and, 
during a merge conflict, a file was created in both branches:

https://github.com/git/git/commit/ec245ba

... it is creating a temp file in a proper temp dir, rather than in the 
working dir.  I think that would be the proper solution here.  However, 
I really want to get this fixed so I'd be happy for this band-aid fix of 
the p4merge script to be checked in until we could get a patch more like 
the aforementioned one, at a later date, to create empty files in a 
proper temp dir and pass them as $LOCAL and $REMOTE.  :-)


--
Best regards,
Jeremy Morton (Jez)

On 11/10/2012 04:22, David Aguilar wrote:

p4merge does not properly handle the case where /dev/null
is passed as a filename.

Workaround it by creating a temporary file for this purpose.

Reported-by: Jeremy Mortonad...@game-point.net
Signed-off-by: David Aguilardav...@gmail.com
---
Jeremy, can you test this?

  mergetools/p4merge | 25 +
  1 file changed, 25 insertions(+)

diff --git a/mergetools/p4merge b/mergetools/p4merge
index 1a45c1b..295361a 100644
--- a/mergetools/p4merge
+++ b/mergetools/p4merge
@@ -1,5 +1,30 @@
  diff_cmd () {
+   # p4merge does not like /dev/null
+   rm_local=
+   rm_remote=
+   if test /dev/null = $LOCAL
+   then
+   LOCAL=./p4merge-dev-null.LOCAL.$$
+   $LOCAL
+   rm_local=true
+   fi
+   if test /dev/null = $REMOTE
+   then
+   REMOTE=./p4merge-dev-null.REMOTE.$$
+   $REMOTE
+   rm_remote=true
+   fi
+
$merge_tool_path $LOCAL $REMOTE
+
+   if test -n $rm_local
+   then
+   rm -f $LOCAL
+   fi
+   if test -n $rm_remote
+   then
+   rm -f $REMOTE
+   fi
  }

  merge_cmd () {

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