Bug 165440 – ChangeLogs become readonly after resolving a conflict

• Component: Tools / Tests
• Status: RESOLVED FIXED

[Alexey Proskuryakov]

When update-webkit or resolve-ChangeLogs resolves a conflict in a ChangeLog, the file becomes read-only.

This looks like a change between svn 1.5 and svn 1.7 - "older" and "newer" files that are created on conflict are read-only, and one of these becomes the resolved file.

<rdar://problem/29491002>

[Alexey Proskuryakov]

Created attachment 296224 [details]
naive fix

It seems good enough to just use 0644 - I don't think that we need to preserve other bits here.

I'm somewhat confused about how merging works on a read-only file up to this point, but it does. Perhaps the patch tool doesn't care about permissions when they can be automagically adjusted while patching?

[David Kilzer (:ddkilzer)]

Comment on attachment 296224 [details]
naive fix

View in context: https://bugs.webkit.org/attachment.cgi?id=296224&action=review

> Tools/Scripts/resolve-ChangeLogs:451
> +            chmod 0644, $fileNewer;

This won't work well when applying a patch to a script that has execute (+x) permissions.

Does Perl have a way to say, "chmod a+w" instead?

Or does svn has a command-line switch to restore its previous behavior?

[Alexey Proskuryakov]

As this is resolve-ChangeLogs scripts, I assume that it won't be used to resolve conflicts in scripts. I didn't find such a switch for svn (nor any discussion of why the change was made).

[Darin Adler]

Comment on attachment 296224 [details]
naive fix

View in context: https://bugs.webkit.org/attachment.cgi?id=296224&action=review

I guess this is OK. I have suggestions though.

>> Tools/Scripts/resolve-ChangeLogs:451
>> +            chmod 0644, $fileNewer;
> 
> This won't work well when applying a patch to a script that has execute (+x) permissions.
> 
> Does Perl have a way to say, "chmod a+w" instead?
> 
> Or does svn has a command-line switch to restore its previous behavior?

I looked on the web a bit and I think this is a better version:

    chmod ((stat($file))[2] & 0777), $fileNewer;

It tries to transfer the permissions the old file had, not including exotic permissions like setuid.

Another way to do it is to simple read $fileNewer and overwrite the contents of $file and then unlink $fileNewer instead of $file. That code would not be hard to write.

[WebKit Commit Bot]

Comment on attachment 296224 [details]
naive fix

Clearing flags on attachment: 296224

Committed r209714: <http://trac.webkit.org/changeset/209714>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.