Eric Raible wrote:
git version 1.6.3.2.1299.gee46c (msysgit)
In trying to track down some annoying crlf corruption in a repo
I have found a Schrödinger's diff. In other words it's unknown
whether the diff will produce output or not on any particular run
of the following script.
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.
I don't get the same result in the same repo, although it only
differs in 1-1.5% of the tests.
Doing an "git ls-tree HEAD" gives an identical tree in both cases.
Can anyone explain why the output to this is not deterministic?
On Linux with git version 1.6.3.3.354.g3b4cc
Pasting your commands into "repro.sh", but redirecting output from
git commit to /dev/null, and then running the following commands
has yielded 9 to 15 sample.$i files over 5 tries of the following:
sh repro.sh > correct
for i in $(seq 1 1000); do
sh repro.sh > sample && cmp sample correct >/dev/null || \
{ echo "fail $i" && cp sample sample.$i; };
done
I'm at a complete loss.
Inserting "sync" between calls as shown below doesn't fix the issue
(although it drops from 9-15 to 4-10 fails on Linux; Not a very good
improvement and only two test-runs). I have no idea how it can behave
so strangely, and I refuse to believe that the ext3 fs driver allows
dirty reads.
# 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"
sync
# I realize that switching is ill-advised, but I'm
# trying to track down a possibly related problem...
git config core.autocrlf true
sync
# 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
--
Andreas Ericsson andreas.ericsson@xxxxxx
OP5 AB www.op5.se
Tel: +46 8-230225 Fax: +46 8-230231
Considering the successes of the wars on alcohol, poverty, drugs and
terror, I think we should give some serious thought to declaring war
on peace.
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