https://bugzilla.wikimedia.org/show_bug.cgi?id=39637
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Bug #: 39637
Summary: diff3 error message logged when undoing an edit at end
of file
Product: MediaWiki
Version: 1.20-git
Platform: PC
OS/Version: Linux
Status: UNCONFIRMED
Severity: enhancement
Priority: Unprioritized
Component: History/Diffs
AssignedTo: [email protected]
ReportedBy: [email protected]
Classification: Unclassified
Mobile Platform: ---
Problem: I host a public MW and it causes the following message to repeatedly
appear in my Apache error.log file:
/usr/bin/diff3: No newline at end of file
At least one situation I've been able to track down which commonly triggers
this "error" is anytime someone attempts to "undo" an edit, which is prior to
the most recent edit, which was at the bottom of the page in the revision in
which it was made.
Minimal example: On a fresh 1.20 install, I create a new page "X" with content
"a". Then I edit page "X" to add a newline and "b". Then another edit to add a
newline and "c". Now if I click "undo" on the second ("b") edit, with "tail -f
/var/log/apache2/error.log" running in another window, I immediately see the
diff3 error appear.
Hack solution: If I make the following mydiff3 function:
#!/bin/bash
diff3 $* |& grep -v "No newline at end of file"
and point wgDiff3 to mydiff3, then (naturally) the error no longer appears in
my log files, and the wiki appears to continue to function as expected.
Severity: I have not been able to find any circumstances where this reported
diff3 "No newline" error causes any unexpected behavior with MW's "undo"/merge
functionality. At this point, the worst consequence I see of this bug is that
it fills my Apache error logs to an extent that gets in the way of me noticing
other errors and bugs.
Relevant system info:
diff3 (GNU diffutils) 3.0
Server version: Apache/2.2.16 (Debian)
Observed this bug in MW 1.15.5 and current 1.20-git
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