This reverts commit fd680bc5 (logmsg_reencode(): warn when iconv()
fails, 2021-08-27). Throwing a warning for each and every commit
that gets reencoded, without allowing a way to squelch, would make
it unpleasant for folks who have to deal with an ancient part of the
history in an old project that used wrong encoding in the commits.
If the user asks for a pretty-printed commit to be converted (either
explicitly with --encoding=foo, or implicitly because the commit is
non-utf8 and we want to convert it), we pass it through iconv(). If that
fails, we fall back to showing the input verbatim, but don't tell the
user that the output may be bogus.
Let's add a warning to do so, along with a mention in the documentation
for --encoding. Two things to note about the implementation:
- we could produce the warning closer to the call to iconv() in
reencode_string_len(), which would let us relay the value of errno.
But this is not actually very helpful. reencode_string_len() does
not know we are operating on a commit, and indeed does not know that
the caller won't produce an error of its own. And the errno values
from iconv() are seldom helpful (iconv_open() only ever produces
EINVAL; perhaps EILSEQ from iconv() might be illuminating, but it
can also return EINVAL for incomplete sequences).
- if the reason for the failure is that the output charset is not
supported, then the user will see this warning for every commit we
try to display. That might be ugly and overwhelming, but on the
other hand it is making it clear that every one of them has not been
converted (and the likely outcome anyway is to re-try the command
with a supported output encoding).
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
7187c7bbb8 (t4210: skip i18n tests that don't work on FreeBSD, 2019-11-27)
adds a REG_ILLSEQ prerequisite, and to do that copies the common branch in
test-lib and expands it to include it in a special case for FreeBSD.
Instead; test for it using a previously added extension to test-tool and
use that, together with a function that identifies when regcomp/regexec
will be called with broken patterns to avoid any test that would otherwise
rely on undefined behaviour.
The description of the first test which wasn't accurate has been corrected,
and the test rearranged for clarity, including a helper function that avoids
overly long lines.
Only the affected engines will have their tests suppressed, also including
"fixed" if the PCRE optimization that uses LIBPCRE2 since b65abcafc7
(grep: use PCRE v2 for optimized fixed-string search, 2019-07-01) is not
available.
Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Carlo Marcelo Arenas Belón <carenas@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
A number of t4210-log-i18n tests added in 4e2443b181 set LC_ALL to a UTF-8
locale (is_IS.UTF-8) but then pass an invalid UTF-8 string to --grep.
FreeBSD's regcomp() fails in this case with REG_ILLSEQ, "illegal byte
sequence," which git then passes to die():
fatal: command line: '�': illegal byte sequence
When these tests were added the commit message stated:
| It's possible that this
| test breaks the "basic" and "extended" backends on some systems that
| are more anal than glibc about the encoding of locale issues with
| POSIX functions that I can remember
which seems to be the case here.
Extend test-lib.sh to add a REGEX_ILLSEQ prereq, set it on FreeBSD, and
add !REGEX_ILLSEQ to the two affected tests.
Signed-off-by: Ed Maste <emaste@freebsd.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
In 5212f91deb ("t4210: skip command-line encoding tests on mingw",
2014-07-17) the positive tests in this file were skipped. That left
the negative tests that don't produce a match.
An upcoming change to migrate the "fixed" backend of grep to PCRE v2
will cause these "log" commands to produce an error instead on
MinGW. This is because the command-line on that platform implicitly
has its encoding changed before being passed to git. See [1].
1. https://public-inbox.org/git/nycvar.QRO.7.76.6.1907011515150.44@tvgsbejvaqbjf.bet/
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Fix a bug introduced in 18547aacf5 ("grep/pcre: support utf-8",
2016-06-25) that was missed due to a blindspot in our tests, as
discussed in the previous commit. I then blindly copied the same bug
in 94da9193a6 ("grep: add support for PCRE v2", 2017-06-01) when
adding the PCRE v2 code.
We should not tell PCRE that we're processing UTF-8 just because we're
dealing with non-ASCII. In the case of e.g. "log --encoding=<...>"
under is_utf8_locale() the haystack might be in ISO-8859-1, and the
needle might be in a non-UTF-8 encoding.
Maybe we should be more strict here and die earlier? Should we also be
converting the needle to the encoding in question, and failing if it's
not a string that's valid in that encoding? Maybe.
But for now matching this as non-UTF8 at least has some hope of
producing sensible results, since we know that our default heuristic
of assuming the text to be matched is in the user locale encoding
isn't true when we've explicitly encoded it to be in a different
encoding.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Improve the tests added in 04deccda11 ("log: re-encode commit messages
before grepping", 2013-02-11) to test the regex backends. Those tests
never worked as advertised, due to the is_fixed() optimization in
grep.c (which was in place at the time), and the needle in the tests
being a fixed string.
We'd thus always use the "fixed" backend during the tests, which would
use the kwset() backend. This backend liberally accepts any garbage
input, so invalid encodings would be silently accepted.
In a follow-up commit we'll fix this bug, this test just demonstrates
the existing issue.
In practice this issue happened on Windows, see [1], but due to the
structure of the existing tests & how liberal the kwset code is about
garbage we missed this.
Cover this blind spot by testing all our regex engines. The PCRE
backend will spot these invalid encodings. It's possible that this
test breaks the "basic" and "extended" backends on some systems that
are more anal than glibc about the encoding of locale issues with
POSIX functions that I can remember, but PCRE is more careful about
the validation.
1. https://public-inbox.org/git/nycvar.QRO.7.76.6.1906271113090.44@tvgsbejvaqbjf.bet/
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Change various tests that use an idiom of the form:
>expect &&
test_cmp expect actual
To instead use:
test_must_be_empty actual
The test_must_be_empty() wrapper was introduced in ca8d148daf ("test:
test_must_be_empty helper", 2013-06-09). Many of these tests have been
added after that time. This was mostly found with, and manually pruned
from:
git grep '^\s+>.*expect.* &&$' t
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Support for Back when bdccd3c1 (test-lib: allow negation of
prerequisites, 2012-11-14) introduced negated predicates
(e.g. "!MINGW,!CYGWIN"), we already had 5 test files that use
NOT_MINGW (and a few MINGW) as prerequisites.
Let's not add NOT_FOO and rewrite existing ones as !FOO for both
MINGW and CYGWIN.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
On Windows the application command line is provided as unicode and in
mingw-git we convert that to utf-8. So these tests that require a iso-8859-1
input are being subverted by the encoding transformations we perform and
should be skipped.
Signed-off-by: Pat Thoyts <patthoyts@users.sourceforge.net>
Signed-off-by: Stepan Kasal <kasal@ucw.cz>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
If you run "git log --grep=foo", we will run your regex on
the literal bytes of the commit message. This can provide
confusing results if the commit message is not in the same
encoding as your grep expression (or worse, you have commits
in multiple encodings, in which case your regex would need
to be written to match either encoding). On top of this, we
might also be grepping in the commit's notes, which are
already re-encoded, potentially leading to grepping in a
buffer with mixed encodings concatenated. This is insanity,
but most people never noticed, because their terminal and
their commit encodings all match.
Instead, let's massage the to-be-grepped commit into a
standardized encoding. There is not much point in adding a
flag for "this is the encoding I expect my grep pattern to
match"; the only sane choice is for it to use the log output
encoding. That is presumably what the user's terminal is
using, and it means that the patterns found by the grep will
match the output produced by git.
As a bonus, this fixes a potential segfault in commit_match
when commit->buffer is NULL, as we now build on logmsg_reencode,
which handles reading the commit buffer from disk if
necessary. The segfault can be triggered with:
git commit -m 'text1' --allow-empty
git commit -m 'text2' --allow-empty
git log --graph --no-walk --grep 'text2'
which arguably does not make any sense (--graph inherently
wants a connected history, and by --no-walk the command line
is telling us to show discrete points in history without
connectivity), and we probably should forbid the
combination, but that is a separate issue.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
