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git/t/t4121-apply-diffs.sh
Alex Riesen 0afa7644f2 Fix overwriting of files when applying contextually independent diffs
Noticed by applying two diffs of different contexts to the same file.

The check for existence of a file was wrong: the test assumed it was
a directory and reset the errno (twice: directly and by calling
lstat). So if an entry existed and was _not_ a directory no attempt
was made to rename into it, because the errno (expected by renaming
code) was already reset to 0. This resulted in error:

    fatal: unable to write file file mode 100644

For Linux, removing "errno = 0" is enough, as lstat wont modify errno
if it was successful. The behavior should not be depended upon,
though, so modify the "if" as well.

The test simulates this situation.

Signed-off-by: Alex Riesen <raa.lkml@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-04-18 15:33:01 -07:00

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#!/bin/sh
test_description='git-apply for contextually independent diffs'
. ./test-lib.sh
echo '1
2
3
4
5
6
7
8' >file
test_expect_success 'setup' \
'git add file &&
git commit -q -m 1 &&
git checkout -b test &&
mv file file.tmp &&
echo 0 >file &&
cat file.tmp >>file &&
rm file.tmp &&
git commit -a -q -m 2 &&
echo 9 >>file &&
git commit -a -q -m 3 &&
git checkout master'
test_expect_success \
'check if contextually independent diffs for the same file apply' \
'( git diff test~2 test~1; git diff test~1 test~0 )| git apply'
test_done