diff-no-index: exit(1) if 'diff --quiet <repo file> <external file>' finds changes

When running 'git diff --quiet <file1> <file2>', if file1 or file2
is outside the repository, it will exit(0) even if the files differ.
It should exit(1) when they differ.

This happens because 'diff_no_index' looks at the 'found_changes'
member from 'diff_options' to determine if changes were made.  This
is the wrong thing to do, since it is only set if xdiff is actually
run and it finds a change (the diff machinery will optimize out the
xdiff call when it is not necessary) and in that case HAS_CHANGED
flag needs to be taken into account.

Use diff_result_code() that knows all these details for the correct
exit value instead.

Signed-off-by: Tim Henigan <tim.henigan@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/diff-no-index.c b/diff-no-index.c
index e6b9952..63c31cc 100644 (file)
--- a/diff-no-index.c
+++ b/diff-no-index.c
@@ -256,5 +256,5 @@ void diff_no_index(struct rev_info *revs,
         * The return code for --no-index imitates diff(1):
         * 0 = no changes, 1 = changes, else error
         */
-       exit(revs->diffopt.found_changes);
+       exit(diff_result_code(&revs->diffopt, 0));
 }

diff --git a/t/t4035-diff-quiet.sh b/t/t4035-diff-quiet.sh
index cdb9202..231412d 100755 (executable)
--- a/t/t4035-diff-quiet.sh
+++ b/t/t4035-diff-quiet.sh
@@ -10,7 +10,22 @@ test_expect_success 'setup' '
        git commit -m first &&
        echo 2 >b &&
        git add . &&
-       git commit -a -m second
+       git commit -a -m second &&
+       mkdir -p test-outside/repo && (
+               cd test-outside/repo &&
+               git init &&
+               echo "1 1" >a &&
+               git add . &&
+               git commit -m 1
+       ) &&
+       mkdir -p test-outside/non/git && (
+               cd test-outside/non/git &&
+               echo "1 1" >a &&
+               echo "1 1" >matching-file &&
+               echo "1 1 " >trailing-space &&
+               echo "1   1" >extra-space &&
+               echo "2" >never-match
+       )
 '
 
 test_expect_success 'git diff-tree HEAD^ HEAD' '
@@ -77,4 +92,60 @@ test_expect_success 'git diff-index --cached HEAD' '
        }
 '
 
+test_expect_success 'git diff, one file outside repo' '
+       (
+               cd test-outside/repo &&
+               test_expect_code 0 git diff --quiet a ../non/git/matching-file &&
+               test_expect_code 1 git diff --quiet a ../non/git/extra-space
+       )
+'
+
+test_expect_success 'git diff, both files outside repo' '
+       (
+               GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/test-outside" &&
+               export GIT_CEILING_DIRECTORIES &&
+               cd test-outside/non/git &&
+               test_expect_code 0 git diff --quiet a matching-file &&
+               test_expect_code 1 git diff --quiet a extra-space
+       )
+'
+
+test_expect_success 'git diff --ignore-space-at-eol, one file outside repo' '
+       (
+               cd test-outside/repo &&
+               test_expect_code 0 git diff --quiet --ignore-space-at-eol a ../non/git/trailing-space &&
+               test_expect_code 1 git diff --quiet --ignore-space-at-eol a ../non/git/extra-space
+       )
+'
+
+test_expect_success 'git diff --ignore-space-at-eol, both files outside repo' '
+       (
+               GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/test-outside" &&
+               export GIT_CEILING_DIRECTORIES &&
+               cd test-outside/non/git &&
+               test_expect_code 0 git diff --quiet --ignore-space-at-eol a trailing-space &&
+               test_expect_code 1 git diff --quiet --ignore-space-at-eol a extra-space
+       )
+'
+
+test_expect_success 'git diff --ignore-all-space, one file outside repo' '
+       (
+               cd test-outside/repo &&
+               test_expect_code 0 git diff --quiet --ignore-all-space a ../non/git/trailing-space &&
+               test_expect_code 0 git diff --quiet --ignore-all-space a ../non/git/extra-space &&
+               test_expect_code 1 git diff --quiet --ignore-all-space a ../non/git/never-match
+       )
+'
+
+test_expect_success 'git diff --ignore-all-space, both files outside repo' '
+       (
+               GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/test-outside" &&
+               export GIT_CEILING_DIRECTORIES &&
+               cd test-outside/non/git &&
+               test_expect_code 0 git diff --quiet --ignore-all-space a trailing-space &&
+               test_expect_code 0 git diff --quiet --ignore-all-space a extra-space &&
+               test_expect_code 1 git diff --quiet --ignore-all-space a never-match
+       )
+'
+
 test_done