* Bug: combined diff with --ignore-matching-lines @ 2022-05-14 9:32 René Scharfe 2022-05-23 18:31 ` [PATCH] diff: fix a segfault in >2 tree -I<regex> and --output=<file> Ævar Arnfjörð Bjarmason 0 siblings, 1 reply; 12+ messages in thread From: René Scharfe @ 2022-05-14 9:32 UTC (permalink / raw) To: Git List Cc: Junio C Hamano, Ævar Arnfjörð Bjarmason, Michał Kępień Hi all, git diff segfaults when it's asked to produce a combined diff and ignore certain lines with --ignore-matching-lines/-I, e.g.: $ git diff -I DEF_VER v2.33.3 v2.33.3^@ zsh: segmentation fault ./git-diff -I DEF_VER v2.33.3 v2.33.3^@ That's because combine-diff.c::diff_tree_combined() copies a diffopt without making a deep copy of the ignore_regex array and frees it, then later tries to use it. The segfault can be fixed by adding "diffopt.no_free = 1;" or reverting c45dc9cf30 (diff: plug memory leak from regcomp() on {log,diff} -I, 2021-02-11). But even with that the only thing the command ignores is the option -I; the GIT-VERSION-GEN changes in the middle should have been omitted: $ git diff -I DEF_VER v2.33.3 v2.33.3^@ diff --cc Documentation/RelNotes/2.33.3.txt index 0000000000,0000000000..e2bada12a1 new file mode 100644 --- /dev/null +++ b/Documentation/RelNotes/2.33.3.txt @@@ -1,0 -1,0 +1,4 @@@ ++Git Documentation/RelNotes/2.33.3.txt Release Notes ++========================= ++ ++This release merges up the fixes that appear in v2.33.3. diff --cc GIT-VERSION-GEN index d81eab5f00,e7efe58866..86a3a2870c --- a/GIT-VERSION-GEN +++ b/GIT-VERSION-GEN @@@ -1,7 -1,7 +1,7 @@@ #!/bin/sh GVF=GIT-VERSION-FILE - DEF_VER=v2.33.2 -DEF_VER=v2.32.2 ++DEF_VER=v2.33.3 LF=' ' diff --cc RelNotes index 8e79de2efe,4ac68388c3..899139d9ec --- a/RelNotes +++ b/RelNotes @@@ -1,1 -1,1 +1,1 @@@ - Documentation/RelNotes/2.33.2.txt -Documentation/RelNotes/2.32.2.txt ++Documentation/RelNotes/2.33.3.txt Just setting need_generic_pathscan is not enough. Ideas? René ^ permalink raw reply [flat|nested] 12+ messages in thread
* [PATCH] diff: fix a segfault in >2 tree -I<regex> and --output=<file> 2022-05-14 9:32 Bug: combined diff with --ignore-matching-lines René Scharfe @ 2022-05-23 18:31 ` Ævar Arnfjörð Bjarmason 2022-05-23 20:08 ` Junio C Hamano 0 siblings, 1 reply; 12+ messages in thread From: Ævar Arnfjörð Bjarmason @ 2022-05-23 18:31 UTC (permalink / raw) To: git Cc: Junio C Hamano, René Scharfe, Michał Kępień, Ævar Arnfjörð Bjarmason Fix a regression in c45dc9cf30 (diff: plug memory leak from regcomp() on {log,diff} -I, 2021-02-11), as noted in [1] there was a logic error where we'd free the regex too soon. Now we'll ensure that diff_free() can be called repeatedly instead. We'd ultimately like to do away with the "no_free" confusion surrounding it, and to attempt to free() things only once, as outlined in [2]. But in the meantime this will fix the segfault. Since the rest of diff_free() was already safe re-invoke this only affected the -I<regex> and --output=<file> options. In both cases our behavior before wasn't very sensible. When producing a combined diff we'll go through combined-diff.c, which doesn't handle many of the options that the corresponding diff.c codepaths do. Thus we're here testing that -I<regex> is ignored in this case, and likewise for --output=<file>, but since this is what we were doing before c45dc9cf30 let's accept it for now. 1. https://lore.kernel.org/git/a6a14213-bc82-d6fb-43dd-5a423c40a4f8@web.de/ 2. https://lore.kernel.org/git/220520.86pmk81a9z.gmgdl@evledraar.gmail.com/ Reported-by: René Scharfe <l.s.r@web.de> Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> --- On Sat, May 14 2022, René Scharfe wrote: > Hi all, > > git diff segfaults when it's asked to produce a combined diff and ignore > certain lines with --ignore-matching-lines/-I, e.g.: > > $ git diff -I DEF_VER v2.33.3 v2.33.3^@ > zsh: segmentation fault ./git-diff -I DEF_VER v2.33.3 v2.33.3^@ diff.c | 9 ++++++--- t/t4013-diff-various.sh | 15 +++++++++++++++ 2 files changed, 21 insertions(+), 3 deletions(-) diff --git a/diff.c b/diff.c index e71cf758861..183c9f21305 100644 --- a/diff.c +++ b/diff.c @@ -6432,8 +6432,10 @@ static void diff_flush_patch_all_file_pairs(struct diff_options *o) static void diff_free_file(struct diff_options *options) { - if (options->close_file) - fclose(options->file); + if (!options->close_file) + return; + options->close_file = 0; + fclose(options->file); } static void diff_free_ignore_regex(struct diff_options *options) @@ -6444,7 +6446,8 @@ static void diff_free_ignore_regex(struct diff_options *options) regfree(options->ignore_regex[i]); free(options->ignore_regex[i]); } - free(options->ignore_regex); + options->ignore_regex_nr = 0; + FREE_AND_NULL(options->ignore_regex); } void diff_free(struct diff_options *options) diff --git a/t/t4013-diff-various.sh b/t/t4013-diff-various.sh index 056e922164d..b556d185f53 100755 --- a/t/t4013-diff-various.sh +++ b/t/t4013-diff-various.sh @@ -614,4 +614,19 @@ test_expect_success 'diff -I<regex>: detect malformed regex' ' test_i18ngrep "invalid regex given to -I: " error ' +test_expect_success 'diff -I<regex>: combined diff does not segfault' ' + revs="HEAD~2 HEAD~ HEAD" && + git diff $revs >expect && + git diff -I . $revs >actual && + test_cmp expect actual +' + +test_expect_success 'diff --output=<file>: combined diff does not segfault' ' + revs="HEAD~2 HEAD~ HEAD" && + git diff --output=expect.file $revs >expect.out && + git diff $revs >actual && + test_cmp expect.out actual && + test_must_be_empty expect.file +' + test_done -- 2.36.1.1038.gde12b200317 ^ permalink raw reply related [flat|nested] 12+ messages in thread
* Re: [PATCH] diff: fix a segfault in >2 tree -I<regex> and --output=<file> 2022-05-23 18:31 ` [PATCH] diff: fix a segfault in >2 tree -I<regex> and --output=<file> Ævar Arnfjörð Bjarmason @ 2022-05-23 20:08 ` Junio C Hamano 2022-05-24 11:38 ` Ævar Arnfjörð Bjarmason 0 siblings, 1 reply; 12+ messages in thread From: Junio C Hamano @ 2022-05-23 20:08 UTC (permalink / raw) To: Ævar Arnfjörð Bjarmason Cc: git, René Scharfe, Michał Kępień Ævar Arnfjörð Bjarmason <avarab@gmail.com> writes: > Fix a regression in c45dc9cf30 (diff: plug memory leak from regcomp() > on {log,diff} -I, 2021-02-11), as noted in [1] there was a logic error > where we'd free the regex too soon. > > Now we'll ensure that diff_free() can be called repeatedly > instead. We'd ultimately like to do away with the "no_free" confusion > surrounding it, and to attempt to free() things only once, as outlined > in [2]. But in the meantime this will fix the segfault. Hmph, repeated calls to diff_free_file() now closes the file upon the first call. I would have expected that such a resource would be released when all the references go away, i.e. upon the last call. The same thing for the ignore-regex array. Clearing the "options->close_file" bit, and using FREE_AND_NULL(), would hide a breakage that could be caused by this change, doesn't it, because any use-after-release will say "ah, no need to close the file" and "oh, there is no regex". The former is not so worrisome, but the latter may be---we may no longer have regex because the first call to diff_free_ignore_regex() has cleared it and the code that wants to use the regex, if exists, would happily say "oh, there is no regex", instead of exposing the use-after-release breakage to a segfault. > Thus we're here testing that -I<regex> is ignored in this case, and > likewise for --output=<file>, but since this is what we were doing > before c45dc9cf30 let's accept it for now. It is true that the result of applying this patch is equivalent to c45dc9cf (diff: plug memory leak from regcomp() on {log,diff} -I, 2021-02-11), but doesn't that merely point at the commit as the source of behaviour breakage? With ignore-regex leaking before that commit, wouldn't we have been using ignore-regex with combined diff machinery? Sorry, but I am failing to convince myself that this is not sweep the issue under the rug. > 1. https://lore.kernel.org/git/a6a14213-bc82-d6fb-43dd-5a423c40a4f8@web.de/ > 2. https://lore.kernel.org/git/220520.86pmk81a9z.gmgdl@evledraar.gmail.com/ > > Reported-by: René Scharfe <l.s.r@web.de> > Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> > --- > > On Sat, May 14 2022, René Scharfe wrote: > >> Hi all, >> >> git diff segfaults when it's asked to produce a combined diff and ignore >> certain lines with --ignore-matching-lines/-I, e.g.: >> >> $ git diff -I DEF_VER v2.33.3 v2.33.3^@ >> zsh: segmentation fault ./git-diff -I DEF_VER v2.33.3 v2.33.3^@ > > diff.c | 9 ++++++--- > t/t4013-diff-various.sh | 15 +++++++++++++++ > 2 files changed, 21 insertions(+), 3 deletions(-) > > diff --git a/diff.c b/diff.c > index e71cf758861..183c9f21305 100644 > --- a/diff.c > +++ b/diff.c > @@ -6432,8 +6432,10 @@ static void diff_flush_patch_all_file_pairs(struct diff_options *o) > > static void diff_free_file(struct diff_options *options) > { > - if (options->close_file) > - fclose(options->file); > + if (!options->close_file) > + return; > + options->close_file = 0; > + fclose(options->file); > } > > static void diff_free_ignore_regex(struct diff_options *options) > @@ -6444,7 +6446,8 @@ static void diff_free_ignore_regex(struct diff_options *options) > regfree(options->ignore_regex[i]); > free(options->ignore_regex[i]); > } > - free(options->ignore_regex); > + options->ignore_regex_nr = 0; > + FREE_AND_NULL(options->ignore_regex); > } > > void diff_free(struct diff_options *options) > diff --git a/t/t4013-diff-various.sh b/t/t4013-diff-various.sh > index 056e922164d..b556d185f53 100755 > --- a/t/t4013-diff-various.sh > +++ b/t/t4013-diff-various.sh > @@ -614,4 +614,19 @@ test_expect_success 'diff -I<regex>: detect malformed regex' ' > test_i18ngrep "invalid regex given to -I: " error > ' > > +test_expect_success 'diff -I<regex>: combined diff does not segfault' ' > + revs="HEAD~2 HEAD~ HEAD" && > + git diff $revs >expect && > + git diff -I . $revs >actual && > + test_cmp expect actual And indeed this casts such a broken behaviour in stone. > +' > + > +test_expect_success 'diff --output=<file>: combined diff does not segfault' ' > + revs="HEAD~2 HEAD~ HEAD" && > + git diff --output=expect.file $revs >expect.out && > + git diff $revs >actual && > + test_cmp expect.out actual && > + test_must_be_empty expect.file So is this one. > +' > + > test_done ^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [PATCH] diff: fix a segfault in >2 tree -I<regex> and --output=<file> 2022-05-23 20:08 ` Junio C Hamano @ 2022-05-24 11:38 ` Ævar Arnfjörð Bjarmason 2022-05-24 19:38 ` Junio C Hamano 0 siblings, 1 reply; 12+ messages in thread From: Ævar Arnfjörð Bjarmason @ 2022-05-24 11:38 UTC (permalink / raw) To: Junio C Hamano; +Cc: git, René Scharfe, Michał Kępień On Mon, May 23 2022, Junio C Hamano wrote: > Ævar Arnfjörð Bjarmason <avarab@gmail.com> writes: > >> Fix a regression in c45dc9cf30 (diff: plug memory leak from regcomp() >> on {log,diff} -I, 2021-02-11), as noted in [1] there was a logic error >> where we'd free the regex too soon. >> >> Now we'll ensure that diff_free() can be called repeatedly >> instead. We'd ultimately like to do away with the "no_free" confusion >> surrounding it, and to attempt to free() things only once, as outlined >> in [2]. But in the meantime this will fix the segfault. > > Hmph, repeated calls to diff_free_file() now closes the file upon > the first call. I would have expected that such a resource would be > released when all the references go away, i.e. upon the last call. > The same thing for the ignore-regex array. Yes, that would be much more sensible. But as noted: When producing a combined diff we'll go through combined-diff.c, which doesn't handle many of the options that the corresponding diff.c codepaths do. I.e. the "right" thing to do in this case would require a much more involved fix. We've somehow ended up not supporting --output=<file>, -I and probably many other options in the combined-diff mode, which both in testing and in this part of the implementation seems to have become an afterthought. So before any changes of mine we silently ignore those options, and in those particular cases the "right" thing to do if we're not growing new features would probably be to error out early if they were provided in the combined diff mode. But as a minimal fix just tailoring diff_free() towards the not-combined-diff.c case seems to be the smallest & most correct thing to do for now to address the segfault & the immediate issue. > Clearing the "options->close_file" bit, and using FREE_AND_NULL(), > would hide a breakage that could be caused by this change, doesn't > it, because any use-after-release will say "ah, no need to close the > file" and "oh, there is no regex". The former is not so worrisome, > but the latter may be---we may no longer have regex because the > first call to diff_free_ignore_regex() has cleared it and the code > that wants to use the regex, if exists, would happily say "oh, there > is no regex", instead of exposing the use-after-release breakage to > a segfault. Yes, this wouldn't make much sense if we were supporting the file output and -I in the combined-diff.c case, but AFAICT the two cases are: 1. The "normal" diff case, where we set those up once, and diff_free() them once. 2. The "combined-diff.c" case, where we might call diff_free() N times, but it's all to produce the diff itself, not for those options. >> Thus we're here testing that -I<regex> is ignored in this case, and >> likewise for --output=<file>, but since this is what we were doing >> before c45dc9cf30 let's accept it for now. > > It is true that the result of applying this patch is equivalent to > c45dc9cf (diff: plug memory leak from regcomp() on {log,diff} -I, > 2021-02-11), but doesn't that merely point at the commit as the > source of behaviour breakage? With ignore-regex leaking before that > commit, wouldn't we have been using ignore-regex with combined diff > machinery? No, because -I never did anything with the combined diff machinery, neither did --output. > Sorry, but I am failing to convince myself that this is not sweep > the issue under the rug. I think that's a fair summary, much of it was already under the rug, we're sweeping some of the remainin parts under it :) I think that whole combined-diff interaction really needs to be fix, not just for the diff_free() case, but e.g. we should either error out or support options that we're silently ignoring now. But as noted in https://lore.kernel.org/git/220520.86pmk81a9z.gmgdl@evledraar.gmail.com/ I do have patches queued up locally that form a better basis for fixing these issues. I.e. once we fix this segfault and have release_revisions() it'll be easy to get rid of that "no_free" case in diff_free(). >> [...] >> void diff_free(struct diff_options *options) >> diff --git a/t/t4013-diff-various.sh b/t/t4013-diff-various.sh >> index 056e922164d..b556d185f53 100755 >> --- a/t/t4013-diff-various.sh >> +++ b/t/t4013-diff-various.sh >> @@ -614,4 +614,19 @@ test_expect_success 'diff -I<regex>: detect malformed regex' ' >> test_i18ngrep "invalid regex given to -I: " error >> ' >> >> +test_expect_success 'diff -I<regex>: combined diff does not segfault' ' >> + revs="HEAD~2 HEAD~ HEAD" && >> + git diff $revs >expect && >> + git diff -I . $revs >actual && >> + test_cmp expect actual > > And indeed this casts such a broken behaviour in stone. > >> +' >> + >> +test_expect_success 'diff --output=<file>: combined diff does not segfault' ' >> + revs="HEAD~2 HEAD~ HEAD" && >> + git diff --output=expect.file $revs >expect.out && >> + git diff $revs >actual && >> + test_cmp expect.out actual && >> + test_must_be_empty expect.file > > So is this one. I was on the fence about adding these tests, since I expected you to comment on this aspect of them. I.e. we could just ignore the output here and narrowly see if we segfault. But since we had no tests at all for this before, and intentional or not this behavior of combined-diff is long-standing behavior (that nobody seems to have noticed or cared about) I think it's good to have tests that check the "expected" (as in what we did before my c45dc9cf30) output. ^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [PATCH] diff: fix a segfault in >2 tree -I<regex> and --output=<file> 2022-05-24 11:38 ` Ævar Arnfjörð Bjarmason @ 2022-05-24 19:38 ` Junio C Hamano 2022-05-24 20:17 ` Ævar Arnfjörð Bjarmason 0 siblings, 1 reply; 12+ messages in thread From: Junio C Hamano @ 2022-05-24 19:38 UTC (permalink / raw) To: Ævar Arnfjörð Bjarmason Cc: git, René Scharfe, Michał Kępień Ævar Arnfjörð Bjarmason <avarab@gmail.com> writes: > I.e. the "right" thing to do in this case would require a much more > involved fix. We've somehow ended up not supporting --output=<file>, -I > and probably many other options in the combined-diff mode, which both in > testing and in this part of the implementation seems to have become an > afterthought. OK, a hopefully final question. How much less involved is it to add a new code (without doing anything in this patch) to detect and die on the combination of combined-diff with these two options, so that we can document the fact that we do not support them? It would give us much better way forward than leaving the command silently ignore and give result that is not in line with what was asked, wouldn't it? That way, the much more involved "fix" will turn into a change to add a missing feature. Thanks. ^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [PATCH] diff: fix a segfault in >2 tree -I<regex> and --output=<file> 2022-05-24 19:38 ` Junio C Hamano @ 2022-05-24 20:17 ` Ævar Arnfjörð Bjarmason 2022-06-18 11:12 ` René Scharfe ` (2 more replies) 0 siblings, 3 replies; 12+ messages in thread From: Ævar Arnfjörð Bjarmason @ 2022-05-24 20:17 UTC (permalink / raw) To: Junio C Hamano; +Cc: git, René Scharfe, Michał Kępień On Tue, May 24 2022, Junio C Hamano wrote: > Ævar Arnfjörð Bjarmason <avarab@gmail.com> writes: > >> I.e. the "right" thing to do in this case would require a much more >> involved fix. We've somehow ended up not supporting --output=<file>, -I >> and probably many other options in the combined-diff mode, which both in >> testing and in this part of the implementation seems to have become an >> afterthought. > > OK, a hopefully final question. > > How much less involved is it to add a new code (without doing > anything in this patch) ...yeah, I think for this one it makes sense to narrowly focus on the segfault... > to detect and die on the combination of > combined-diff with these two options, so that we can document the > fact that we do not support them? It would give us much better way > forward than leaving the command silently ignore and give result > that is not in line with what was asked, wouldn't it? That way, the > much more involved "fix" will turn into a change to add a missing > feature. I think not much, it's rather trivial for the case where we invoke "git diff", I.e. just adding something to the "builtin_diff_combined()" branch in builtin/diff.c to detect these two cases specifically. I haven't looked in any depth into how we might reach code in combine-diff.c through other means, and if any of it can set these two indirectly somewhere else (i.e. other things that take diff options). I also wonder if I'm just wrong in my assessment that it's a Bad Thing that we take some of these without ever doing anything with them in some modes, e.g.: git log --oneline -I foo This will never do anything with that "-I foo" by definition, but would as soon as you add -p, should we error without -p (or other diff-showing options). The same goes for range-diff, format-patch, --remerge-diff and any number of other things where we take the full set of options, but only do something with a limited subset of them. It is helpful in some cases if we were more anal about it, e.g. when I was wondering why -I didn't do anything with the combined diff, but also handy for scripting and one-liners if you can tweak the command-line back & forth without it being so strict. So I don't know. Maybe I'm just trying to talk myself out of pulling on that (bound to be long) thread, but I'm coming more around to this just being a non-issue beyond the narrow and needed fix for diff_free() in particular. I.e. the more general approach of chasing down options that don't do anything for a given "diff mode". We might still want to error on some particular ones, such as -I with the combined diff (but not with --oneline, or whatever). ^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [PATCH] diff: fix a segfault in >2 tree -I<regex> and --output=<file> 2022-05-24 20:17 ` Ævar Arnfjörð Bjarmason @ 2022-06-18 11:12 ` René Scharfe 2022-06-18 11:12 ` [PATCH 1/2] combine-diff: abort if --ignore-matching-lines is given René Scharfe 2022-06-18 11:12 ` [PATCH 2/2] combine-diff: abort if --output " René Scharfe 2 siblings, 0 replies; 12+ messages in thread From: René Scharfe @ 2022-06-18 11:12 UTC (permalink / raw) To: Ævar Arnfjörð Bjarmason, Junio C Hamano Cc: git, Michał Kępień Am 24.05.22 um 22:17 schrieb Ævar Arnfjörð Bjarmason: > > On Tue, May 24 2022, Junio C Hamano wrote: > >> Ævar Arnfjörð Bjarmason <avarab@gmail.com> writes: >> >>> I.e. the "right" thing to do in this case would require a much more >>> involved fix. We've somehow ended up not supporting --output=<file>, -I >>> and probably many other options in the combined-diff mode, which both in >>> testing and in this part of the implementation seems to have become an >>> afterthought. >> >> OK, a hopefully final question. >> >> How much less involved is it to add a new code (without doing >> anything in this patch) > > ...yeah, I think for this one it makes sense to narrowly focus on the > segfault... > >> to detect and die on the combination of >> combined-diff with these two options, so that we can document the >> fact that we do not support them? It would give us much better way >> forward than leaving the command silently ignore and give result >> that is not in line with what was asked, wouldn't it? That way, the >> much more involved "fix" will turn into a change to add a missing >> feature. > > I think not much, it's rather trivial for the case where we invoke "git > diff", I.e. just adding something to the "builtin_diff_combined()" > branch in builtin/diff.c to detect these two cases specifically. > > I haven't looked in any depth into how we might reach code in > combine-diff.c through other means, and if any of it can set these two > indirectly somewhere else (i.e. other things that take diff options). So let's add those checks there. > I also wonder if I'm just wrong in my assessment that it's a Bad Thing > that we take some of these without ever doing anything with them in some > modes, e.g.: > > git log --oneline -I foo > > This will never do anything with that "-I foo" by definition, but would > as soon as you add -p, should we error without -p (or other diff-showing > options). Which definition? The documentation says: -I<regex>, --ignore-matching-lines=<regex> Ignore changes whose all lines match <regex>. This option may be specified more than once. That sounds to me like it would affect history simplification, and thus git log --oneline. (Which seems expensive, but that's a different concern.) So based on that I'd expect at least a warning if -I is ignored. > The same goes for range-diff, format-patch, --remerge-diff and any > number of other things where we take the full set of options, but only > do something with a limited subset of them. > > It is helpful in some cases if we were more anal about it, e.g. when I > was wondering why -I didn't do anything with the combined diff, but also > handy for scripting and one-liners if you can tweak the command-line > back & forth without it being so strict. > > So I don't know. Maybe I'm just trying to talk myself out of pulling on > that (bound to be long) thread, but I'm coming more around to this just > being a non-issue beyond the narrow and needed fix for diff_free() in > particular. > > I.e. the more general approach of chasing down options that don't do > anything for a given "diff mode". We might still want to error on some > particular ones, such as -I with the combined diff (but not with > --oneline, or whatever). Supporting all combinations would be ideal. Reporting unsupported combinations would be the next best thing. I wonder if we passed the point of having so many options for e.g. git log that assessing all of their pairings has become impractical, though. :-/ René ^ permalink raw reply [flat|nested] 12+ messages in thread
* [PATCH 1/2] combine-diff: abort if --ignore-matching-lines is given 2022-05-24 20:17 ` Ævar Arnfjörð Bjarmason 2022-06-18 11:12 ` René Scharfe @ 2022-06-18 11:12 ` René Scharfe 2022-06-21 15:35 ` Junio C Hamano 2022-06-18 11:12 ` [PATCH 2/2] combine-diff: abort if --output " René Scharfe 2 siblings, 1 reply; 12+ messages in thread From: René Scharfe @ 2022-06-18 11:12 UTC (permalink / raw) To: Ævar Arnfjörð Bjarmason, Junio C Hamano Cc: git, Michał Kępień The code for combined diffs doesn't currently support ignoring changes that match a regex. Abort and report that fact instead of running into a segfault. Signed-off-by: René Scharfe <l.s.r@web.de> --- combine-diff.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/combine-diff.c b/combine-diff.c index b724f02123..11df1d7f39 100644 --- a/combine-diff.c +++ b/combine-diff.c @@ -1498,6 +1498,10 @@ void diff_tree_combined(const struct object_id *oid, int i, num_paths, needsep, show_log_first, num_parent = parents->nr; int need_generic_pathscan; + if (opt->ignore_regex_nr) + die("combined diff and '%s' cannot be used together", + "--ignore-matching-lines"); + /* nothing to do, if no parents */ if (!num_parent) return; -- 2.36.1 ^ permalink raw reply related [flat|nested] 12+ messages in thread
* Re: [PATCH 1/2] combine-diff: abort if --ignore-matching-lines is given 2022-06-18 11:12 ` [PATCH 1/2] combine-diff: abort if --ignore-matching-lines is given René Scharfe @ 2022-06-21 15:35 ` Junio C Hamano 2022-06-21 15:58 ` René Scharfe 0 siblings, 1 reply; 12+ messages in thread From: Junio C Hamano @ 2022-06-21 15:35 UTC (permalink / raw) To: René Scharfe Cc: Ævar Arnfjörð Bjarmason, git, Michał Kępień René Scharfe <l.s.r@web.de> writes: > The code for combined diffs doesn't currently support ignoring changes > that match a regex. Abort and report that fact instead of running into > a segfault. > > Signed-off-by: René Scharfe <l.s.r@web.de> > --- > combine-diff.c | 4 ++++ > 1 file changed, 4 insertions(+) Makes sense. > diff --git a/combine-diff.c b/combine-diff.c > index b724f02123..11df1d7f39 100644 > --- a/combine-diff.c > +++ b/combine-diff.c > @@ -1498,6 +1498,10 @@ void diff_tree_combined(const struct object_id *oid, > int i, num_paths, needsep, show_log_first, num_parent = parents->nr; > int need_generic_pathscan; > > + if (opt->ignore_regex_nr) > + die("combined diff and '%s' cannot be used together", > + "--ignore-matching-lines"); "X cannot be used together _with_ Y" perhaps? > /* nothing to do, if no parents */ > if (!num_parent) > return; > -- > 2.36.1 ^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [PATCH 1/2] combine-diff: abort if --ignore-matching-lines is given 2022-06-21 15:35 ` Junio C Hamano @ 2022-06-21 15:58 ` René Scharfe 2022-06-21 16:55 ` Junio C Hamano 0 siblings, 1 reply; 12+ messages in thread From: René Scharfe @ 2022-06-21 15:58 UTC (permalink / raw) To: Junio C Hamano Cc: Ævar Arnfjörð Bjarmason, git, Michał Kępień Am 21.06.22 um 17:35 schrieb Junio C Hamano: > René Scharfe <l.s.r@web.de> writes: > >> The code for combined diffs doesn't currently support ignoring changes >> that match a regex. Abort and report that fact instead of running into >> a segfault. >> >> Signed-off-by: René Scharfe <l.s.r@web.de> >> --- >> combine-diff.c | 4 ++++ >> 1 file changed, 4 insertions(+) > > Makes sense. > >> diff --git a/combine-diff.c b/combine-diff.c >> index b724f02123..11df1d7f39 100644 >> --- a/combine-diff.c >> +++ b/combine-diff.c >> @@ -1498,6 +1498,10 @@ void diff_tree_combined(const struct object_id *oid, >> int i, num_paths, needsep, show_log_first, num_parent = parents->nr; >> int need_generic_pathscan; >> >> + if (opt->ignore_regex_nr) >> + die("combined diff and '%s' cannot be used together", >> + "--ignore-matching-lines"); > > "X cannot be used together _with_ Y" perhaps? Not sure, but that type of message was recently unified (most common case: "options '%s' and '%s' cannot be used together") and "with" is only used in an untranslated BUG: $ git grep -e "cannot be used together" --and --not -e options '*.c' builtin/add.c: die(_("'%s' and pathspec arguments cannot be used together"), "--pathspec-from-file"); builtin/am.c: "cannot be used together"), builtin/checkout.c: die(_("'%s' and pathspec arguments cannot be used together"), "--pathspec-from-file"); builtin/clean.c: die(_("-x and -X cannot be used together")); builtin/commit.c: die(_("'%s' and pathspec arguments cannot be used together"), "--pathspec-from-file"); builtin/commit.c: die(_("reword option of '%s' and path '%s' cannot be used together"), "--fixup", *argv); builtin/commit.c: die(_("reword option of '%s' and '%s' cannot be used together"), builtin/describe.c: die(_("option '%s' and commit-ishes cannot be used together"), "--dirty"); builtin/describe.c: die(_("option '%s' and commit-ishes cannot be used together"), "--broken"); builtin/rebase.c: "cannot be used together")); builtin/reset.c: die(_("'%s' and pathspec arguments cannot be used together"), "--pathspec-from-file"); builtin/rev-list.c: die(_("marked counting and '%s' cannot be used together"), "--objects"); builtin/rm.c: die(_("'%s' and pathspec arguments cannot be used together"), "--pathspec-from-file"); builtin/stash.c: die(_("'%s' and pathspec arguments cannot be used together"), "--pathspec-from-file"); revision.c: BUG("--single-worktree cannot be used together with submodule"); upload-pack.c: die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together"); So there doesn't seem to be a fully consistent style amongst these special cases. How about this? die(_("option '%s' and combined diffs cannot be used together"), > >> /* nothing to do, if no parents */ >> if (!num_parent) >> return; >> -- >> 2.36.1 ^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [PATCH 1/2] combine-diff: abort if --ignore-matching-lines is given 2022-06-21 15:58 ` René Scharfe @ 2022-06-21 16:55 ` Junio C Hamano 0 siblings, 0 replies; 12+ messages in thread From: Junio C Hamano @ 2022-06-21 16:55 UTC (permalink / raw) To: René Scharfe Cc: Ævar Arnfjörð Bjarmason, git, Michał Kępień René Scharfe <l.s.r@web.de> writes: >>> + if (opt->ignore_regex_nr) >>> + die("combined diff and '%s' cannot be used together", >>> + "--ignore-matching-lines"); >> >> "X cannot be used together _with_ Y" perhaps? > > Not sure, but that type of message was recently unified (most common > case: "options '%s' and '%s' cannot be used together") and "with" is > only used in an untranslated BUG: Ah, sorry, I completely misread the original as "combined diff cannot be used together with ignore-matching-lines". Sorry for the noise. ^ permalink raw reply [flat|nested] 12+ messages in thread
* [PATCH 2/2] combine-diff: abort if --output is given 2022-05-24 20:17 ` Ævar Arnfjörð Bjarmason 2022-06-18 11:12 ` René Scharfe 2022-06-18 11:12 ` [PATCH 1/2] combine-diff: abort if --ignore-matching-lines is given René Scharfe @ 2022-06-18 11:12 ` René Scharfe 2 siblings, 0 replies; 12+ messages in thread From: René Scharfe @ 2022-06-18 11:12 UTC (permalink / raw) To: Ævar Arnfjörð Bjarmason, Junio C Hamano Cc: git, Michał Kępień The code for combined diffs currently only writes to stdout. Abort and report that fact instead of silently ignoring the --output option. The (empty) output file has already been created at that point, though. Reported-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: René Scharfe <l.s.r@web.de> --- combine-diff.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/combine-diff.c b/combine-diff.c index 11df1d7f39..b0ece95480 100644 --- a/combine-diff.c +++ b/combine-diff.c @@ -1501,6 +1501,9 @@ void diff_tree_combined(const struct object_id *oid, if (opt->ignore_regex_nr) die("combined diff and '%s' cannot be used together", "--ignore-matching-lines"); + if (opt->close_file) + die("combined diff and '%s' cannot be used together", + "--output"); /* nothing to do, if no parents */ if (!num_parent) -- 2.36.1 ^ permalink raw reply related [flat|nested] 12+ messages in thread
end of thread, other threads:[~2022-06-21 16:57 UTC | newest] Thread overview: 12+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2022-05-14 9:32 Bug: combined diff with --ignore-matching-lines René Scharfe 2022-05-23 18:31 ` [PATCH] diff: fix a segfault in >2 tree -I<regex> and --output=<file> Ævar Arnfjörð Bjarmason 2022-05-23 20:08 ` Junio C Hamano 2022-05-24 11:38 ` Ævar Arnfjörð Bjarmason 2022-05-24 19:38 ` Junio C Hamano 2022-05-24 20:17 ` Ævar Arnfjörð Bjarmason 2022-06-18 11:12 ` René Scharfe 2022-06-18 11:12 ` [PATCH 1/2] combine-diff: abort if --ignore-matching-lines is given René Scharfe 2022-06-21 15:35 ` Junio C Hamano 2022-06-21 15:58 ` René Scharfe 2022-06-21 16:55 ` Junio C Hamano 2022-06-18 11:12 ` [PATCH 2/2] combine-diff: abort if --output " René Scharfe
Code repositories for project(s) associated with this public inbox https://80x24.org/mirrors/git.git This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).