Subject: Re: Schrödinger's diff

From: Johannes Sixt <[email-masked]>
Date: Tue, 07 Jul 2009 09:28:13 +0200

Eric Raible schrieb:
> Sometimes it does, and sometimes it doesn't (seems to be about
> 50/50).  But either way in any given repo rerunning the git-diff will
> always give the same result.
> 
> Doing an "git ls-tree HEAD" gives an identical tree in both cases.
> 
> Can anyone explain why the output to this is not deterministic?
> I'm at a complete loss.
> 
> 	# Clean up from last run and start over
> 	rm -rf .git has-crlf
> 	git init
> 	git config core.autocrlf false
> 
> 	# Add a "bad" file
> 	perl -e 'printf( "12%c%c", 0xd, 0xa )' > has-crlf
> 	git add has-crlf
> 	git commit -m"add crlf"
> 
> 	# I realize that switching is ill-advised, but I'm
> 	# trying to track down a possibly related problem...
> 	git config core.autocrlf true
> 
> 	# This sometimes produces output and sometimes it doesn't.
> 	# Either way rerunning just git-diff always gives the same result
> 	# as the first run in this repo.
> 	git diff

If I put this in a script, I get a diff in 9 out of 10 runs. If I insert
'sleep 1' right before the 'git add', I never get a diff.

I'm handing this off to people who care about core.autocrlf and who know
how racily-clean index entries (not) work ;)

-- Hannes