trac-admin tool stdout flush problem

[oren@…]

"autoflush" is disabled, and thus when trying to hotcopy to a bad directory I get the following message (note the bad chronological order of the lines):

www-data@web:~$ trac-admin /data/trac/dirstat hotcopy /tmp/bla
Command failed: [Errno 17] File exists: '/tmp/bla'
Hotcopying /data/trac/dirstat to /tmp/bla ...

I'd suggest modifying the shebang line of trac-admin to "#!/usr/bin/python -u" in order to solve this. (attached as a micro-patch)

[oren@…]

Patch to address an autoflush issue

[Christian Boos]

The shebang trick won't work on windows, so if the problem also shows up there (will try), the proposed fix is not OK.

[Jeffrey Hulten <jeffh@…>]

You need someone to try and replicate this on Windows?

[oren@…]

Yes please!

[Remy Blank]

Instead of using python -u on the shebang line, the following article has several other solutions:

​http://stackoverflow.com/questions/107705/python-output-buffering

In particular, the following solutions make the most sense to me:

• sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)

• Call sys.stdout.flush() after every write(). This could be done either in trac.admin.console.printout() or directly in trac.util.text.console_print().

[Christian Boos]

Milestone 1.0 deleted