[cvsnt] Cannot use WinMerge to vew revision diffs on ISO files...

Gerhard Fiedler lists at connectionbrazil.com
Tue Dec 4 23:50:22 GMT 2007

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Bo Berglund wrote:

> I have just discovered a problem with using WinMerge to see the changes
> between two versions of an ISO file. 
> The ISO file is a machine tool NC program and is completely text based.

I created an .iso text file. On my system the extension is associated with
a tool that handles ISO CD images.

> At first I had trouble adding it as text to the repository. Even though I
> clicked the Add as Text button in WinCvs the following commit made it a
> binary file! 
> So I had to remove the file in the repository and edit the Entries file
> to get rid of the CVS registration. Then I again added it using the text
> button, but this time I looked at the result locally and sure enough it
> was marked as binary. So now before committing I edited the Entries file
> and removed the -kb marker from it. Then I could commit and it stayed as
> text.

I had the same experience (I skipped the first step though :)

It seems that the tools (TCVS in my case) use a normal cvs add without any
options when adding a file with the default text options -- which seems to
get overridden by CVSNT default options associated to file extensions.

> But now the next problem happened:
> I had a new revision to the file that i wanted to commit, but first I
> wanted to see the differences so i used the DIFF button in WinCvs. This
> brought up WinMerge normally but then it popped a message box:
> "C:\Documents and Settings\bob\Local
> Settings\Temp\G912_SERIAL_1.1_11.iso: the file cannot be accessed by the
> system"
> Which is bogus because when I go there the file is accessible and
> readable by my text editor...

FWIW, doing something similar with TCVS (set up to use WinMerge as external
diff app) works here.

> Has anyone seen anything like this? And is it a WinCvs issue or something
> with CVSNT (the binary addition) or WinMerge (the inability of diffing
> the file)???

The binary addition seems to be an interaction between the GUI tool (in
that it doesn't spec the -k options explicitly) and an CVSNT default for
.iso files. When using cvs add with explicit -k options (e.g. -ktkv), the
options seem to get preserved.

WinMerge seems to be capable of diffing .iso files if they are text files
(it does it just fine here).

So I don't think it's either of these tools.

> I am running CVSNT build 2382 on both server and client.
> WinCvs is version (build 1)

WinMerge Unicode
TCVS 1.10.1 RC11
CVSNT client Concurrent Versions System (CVSNT) 2.5.04 (Zen) Build 2862
CVSNT server Concurrent Versions System (CVSNT) 2.5.03 (Scorpio) Build 2382


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