On Mon, Dec 16, 2013 at 4:32 PM, Junio C Hamano <[email protected]> wrote:
> Samuel Bronson <[email protected]> writes:
>
>> for i in 1 2
>> do
>> test_expect_success "orderfile using option ($i)" '
>> git diff -Oorder_file_$i --name-only HEAD^..HEAD >actual &&
>> test_cmp expect_$i actual
>> '
>
> This funny indentation in the previous step needs to be fixed, and
> the added block below should match.
Even though this results in oddly-indented --verbose output?
>> + rm -f order_fifo &&
>> + mkfifo order_fifo &&
>> + cat order_file_$i >order_fifo &
>> + git diff -O order_fifo --name-only HEAD^..HEAD >actual &&
>
> I think this part can be racy depending on which between cat and
> "git diff" are scheduled first, no? Try running this test under
> load and I think you will see it deadlocked.
>
> Besides, the above breaks && chain; even if mkfifo breaks (hence not
> allowing cat to run), "git diff" will go ahead and run, no?
Hmm. Well, what I really wanted to put here was a "process substitution":
git diff -O <(cat order_file_$i) --name-only HEAD^..HEAD >actual &&
but I did not see this feature listed in the dash(1) manpage, so I
assumed it wasn't allowed by POSIX. And, having looked, I indeed
don't see it mentioned in POSIX either.
I'm not terribly surprised that I screwed up the translation to FIFOs;
how would I really want to do it?
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