mirror of
https://github.com/git/git.git
synced 2025-12-12 20:36:24 +01:00
623f7af284
In --quiet mode, since we produce only an exit code for "something was
changed" and no actual output, we can often get by with just a
tree-level diff. However, certain options require us to actually look at
the file contents (e.g., if we are ignoring whitespace changes). We have
a flag "diff_from_contents" for that, and if it is set we call
diff_flush() on each path.
To avoid producing any output (since we were asked to be --quiet), we
traditionally just redirected the output to /dev/null. That changed in
b55e6d36eb (diff: ensure consistent diff behavior with ignore options,
2025-08-08), which replaced that with a "dry_run" flag. In theory, with
dry_run set, we should produce no output. But it carries a risk of
regression: if we forget to respect dry_run in any of the output paths,
we'll accidentally produce output.
And indeed, there is at least one such regression in that commit, as it
covered only the case where we actually call into xdiff, and not
creation or deletion diffs, where we manually generate the headers. We
even test this case in t4035, but only with diff-tree, which does not
show the bug by default because it does not require diff_from_contents.
But git-diff does, because it allows external diff programs by default
(so we must dig into each diff filepair to decide if it requires running
an external diff that may declare two distinct blobs to actually be the
same).
We should fix all of those code paths to respect dry_run correctly, but
in the meantime we can protect ourselves more fully by restoring the
redirection to /dev/null. This gives us an extra layer of protection
against regressions dues to other code paths we've missed.
Though the original issue was reported with "git diff" (and due to its
default of --ext-diff), I've used "diff-tree -w" in the new test. It
triggers the same issue, but I think the fact that "-w" implies
diff_from_contents is a bit more obvious, and fits in with the rest of
t4035.
Reported-by: Jake Zimmerman <jake@zimmerman.io>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
169 lines
5.0 KiB
Bash
Executable File
169 lines
5.0 KiB
Bash
Executable File
#!/bin/sh
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test_description='Return value of diffs'
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. ./test-lib.sh
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test_expect_success 'setup' '
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echo 1 >a &&
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git add . &&
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git commit -m first &&
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echo 2 >b &&
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git add . &&
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git commit -a -m second &&
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mkdir -p test-outside/repo && (
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cd test-outside/repo &&
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git init &&
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echo "1 1" >a &&
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git add . &&
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git commit -m 1
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) &&
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mkdir -p test-outside/non/git && (
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cd test-outside/non/git &&
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echo "1 1" >a &&
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echo "1 1" >matching-file &&
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echo "1 1 " >trailing-space &&
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echo "1 1" >extra-space &&
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echo "2" >never-match
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)
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'
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test_expect_success 'git diff-tree HEAD^ HEAD' '
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test_expect_code 1 git diff-tree --quiet HEAD^ HEAD >cnt &&
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test_line_count = 0 cnt
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'
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test_expect_success 'git diff-tree HEAD^ HEAD -- a' '
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test_expect_code 0 git diff-tree --quiet HEAD^ HEAD -- a >cnt &&
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test_line_count = 0 cnt
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'
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test_expect_success 'git diff-tree HEAD^ HEAD -- b' '
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test_expect_code 1 git diff-tree --quiet HEAD^ HEAD -- b >cnt &&
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test_line_count = 0 cnt
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'
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# this diff outputs one line: sha1 of the given head
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test_expect_success 'echo HEAD | git diff-tree --stdin' '
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echo $(git rev-parse HEAD) |
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test_expect_code 1 git diff-tree --quiet --stdin >cnt &&
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test_line_count = 1 cnt
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'
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test_expect_success 'git diff-tree HEAD HEAD' '
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test_expect_code 0 git diff-tree --quiet HEAD HEAD >cnt &&
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test_line_count = 0 cnt
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'
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test_expect_success 'git diff-tree -w HEAD^ HEAD' '
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test_expect_code 1 git diff-tree --quiet -w HEAD^ HEAD >cnt &&
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test_line_count = 0 cnt
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'
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test_expect_success 'git diff-files' '
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test_expect_code 0 git diff-files --quiet >cnt &&
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test_line_count = 0 cnt
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'
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test_expect_success 'git diff-index --cached HEAD' '
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test_expect_code 0 git diff-index --quiet --cached HEAD >cnt &&
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test_line_count = 0 cnt
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'
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test_expect_success 'git diff-index --cached HEAD^' '
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test_expect_code 1 git diff-index --quiet --cached HEAD^ >cnt &&
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test_line_count = 0 cnt
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'
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test_expect_success 'git diff-index --cached HEAD^' '
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echo text >>b &&
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echo 3 >c &&
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git add . &&
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test_expect_code 1 git diff-index --quiet --cached HEAD^ >cnt &&
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test_line_count = 0 cnt
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'
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test_expect_success 'git diff-tree -Stext HEAD^ HEAD -- b' '
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git commit -m "text in b" &&
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test_expect_code 1 git diff-tree --quiet -Stext HEAD^ HEAD -- b >cnt &&
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test_line_count = 0 cnt
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'
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test_expect_success 'git diff-tree -Snot-found HEAD^ HEAD -- b' '
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test_expect_code 0 git diff-tree --quiet -Snot-found HEAD^ HEAD -- b >cnt &&
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test_line_count = 0 cnt
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'
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test_expect_success 'git diff-files' '
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echo 3 >>c &&
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test_expect_code 1 git diff-files --quiet >cnt &&
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test_line_count = 0 cnt
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'
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test_expect_success 'git diff-index --cached HEAD' '
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git update-index c &&
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test_expect_code 1 git diff-index --quiet --cached HEAD >cnt &&
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test_line_count = 0 cnt
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'
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test_expect_success 'git diff, one file outside repo' '
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(
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cd test-outside/repo &&
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test_expect_code 0 git diff --quiet a ../non/git/matching-file &&
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test_expect_code 1 git diff --quiet a ../non/git/extra-space
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)
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'
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test_expect_success 'git diff, both files outside repo' '
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(
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GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/test-outside" &&
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export GIT_CEILING_DIRECTORIES &&
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cd test-outside/non/git &&
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test_expect_code 0 git diff --quiet a matching-file &&
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test_expect_code 1 git diff --quiet a extra-space
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)
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'
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test_expect_success 'git diff --ignore-space-at-eol, one file outside repo' '
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(
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cd test-outside/repo &&
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test_expect_code 0 git diff --quiet --ignore-space-at-eol a ../non/git/trailing-space &&
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test_expect_code 1 git diff --quiet --ignore-space-at-eol a ../non/git/extra-space
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)
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'
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test_expect_success 'git diff --ignore-space-at-eol, both files outside repo' '
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(
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GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/test-outside" &&
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export GIT_CEILING_DIRECTORIES &&
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cd test-outside/non/git &&
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test_expect_code 0 git diff --quiet --ignore-space-at-eol a trailing-space &&
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test_expect_code 1 git diff --quiet --ignore-space-at-eol a extra-space
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)
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'
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test_expect_success 'git diff --ignore-all-space, one file outside repo' '
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(
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cd test-outside/repo &&
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test_expect_code 0 git diff --quiet --ignore-all-space a ../non/git/trailing-space &&
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test_expect_code 0 git diff --quiet --ignore-all-space a ../non/git/extra-space &&
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test_expect_code 1 git diff --quiet --ignore-all-space a ../non/git/never-match
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)
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'
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test_expect_success 'git diff --ignore-all-space, both files outside repo' '
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(
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GIT_CEILING_DIRECTORIES="$TRASH_DIRECTORY/test-outside" &&
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export GIT_CEILING_DIRECTORIES &&
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cd test-outside/non/git &&
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test_expect_code 0 git diff --quiet --ignore-all-space a trailing-space &&
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test_expect_code 0 git diff --quiet --ignore-all-space a extra-space &&
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test_expect_code 1 git diff --quiet --ignore-all-space a never-match
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)
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'
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test_expect_success 'git diff --quiet ignores stat-change only entries' '
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test-tool chmtime +10 a &&
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echo modified >>b &&
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test_expect_code 1 git diff --quiet
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'
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test_expect_success 'git diff --quiet on a path that need conversion' '
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echo "crlf.txt text=auto" >.gitattributes &&
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printf "Hello\r\nWorld\r\n" >crlf.txt &&
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git add .gitattributes crlf.txt &&
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printf "Hello\r\nWorld\n" >crlf.txt &&
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git diff --quiet crlf.txt
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'
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test_done
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