From: Jeff King Date: Mon, 11 Feb 2013 20:59:58 +0000 (-0500) Subject: log: re-encode commit messages before grepping X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=04deccda112881f87bb514445aa2e539f77f6095;p=git.git log: re-encode commit messages before grepping 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 Signed-off-by: Junio C Hamano --- diff --git a/revision.c b/revision.c index d7562ee50..ef6020541 100644 --- a/revision.c +++ b/revision.c @@ -2268,7 +2268,10 @@ static int commit_rewrite_person(struct strbuf *buf, const char *what, struct st static int commit_match(struct commit *commit, struct rev_info *opt) { int retval; + const char *encoding; + char *message; struct strbuf buf = STRBUF_INIT; + if (!opt->grep_filter.pattern_list && !opt->grep_filter.header_list) return 1; @@ -2279,13 +2282,23 @@ static int commit_match(struct commit *commit, struct rev_info *opt) strbuf_addch(&buf, '\n'); } + /* + * We grep in the user's output encoding, under the assumption that it + * is the encoding they are most likely to write their grep pattern + * for. In addition, it means we will match the "notes" encoding below, + * so we will not end up with a buffer that has two different encodings + * in it. + */ + encoding = get_log_output_encoding(); + message = logmsg_reencode(commit, encoding); + /* Copy the commit to temporary if we are using "fake" headers */ if (buf.len) - strbuf_addstr(&buf, commit->buffer); + strbuf_addstr(&buf, message); if (opt->grep_filter.header_list && opt->mailmap) { if (!buf.len) - strbuf_addstr(&buf, commit->buffer); + strbuf_addstr(&buf, message); commit_rewrite_person(&buf, "\nauthor ", opt->mailmap); commit_rewrite_person(&buf, "\ncommitter ", opt->mailmap); @@ -2294,18 +2307,18 @@ static int commit_match(struct commit *commit, struct rev_info *opt) /* Append "fake" message parts as needed */ if (opt->show_notes) { if (!buf.len) - strbuf_addstr(&buf, commit->buffer); - format_display_notes(commit->object.sha1, &buf, - get_log_output_encoding(), 1); + strbuf_addstr(&buf, message); + format_display_notes(commit->object.sha1, &buf, encoding, 1); } - /* Find either in the commit object, or in the temporary */ + /* Find either in the original commit message, or in the temporary */ if (buf.len) retval = grep_buffer(&opt->grep_filter, buf.buf, buf.len); else retval = grep_buffer(&opt->grep_filter, - commit->buffer, strlen(commit->buffer)); + message, strlen(message)); strbuf_release(&buf); + logmsg_free(message, commit); return retval; } diff --git a/t/t4210-log-i18n.sh b/t/t4210-log-i18n.sh new file mode 100755 index 000000000..52a74729b --- /dev/null +++ b/t/t4210-log-i18n.sh @@ -0,0 +1,58 @@ +#!/bin/sh + +test_description='test log with i18n features' +. ./test-lib.sh + +# two forms of é +utf8_e=$(printf '\303\251') +latin1_e=$(printf '\351') + +test_expect_success 'create commits in different encodings' ' + test_tick && + cat >msg <<-EOF && + utf8 + + t${utf8_e}st + EOF + git add msg && + git -c i18n.commitencoding=utf8 commit -F msg && + cat >msg <<-EOF && + latin1 + + t${latin1_e}st + EOF + git add msg && + git -c i18n.commitencoding=ISO-8859-1 commit -F msg +' + +test_expect_success 'log --grep searches in log output encoding (utf8)' ' + cat >expect <<-\EOF && + latin1 + utf8 + EOF + git log --encoding=utf8 --format=%s --grep=$utf8_e >actual && + test_cmp expect actual +' + +test_expect_success 'log --grep searches in log output encoding (latin1)' ' + cat >expect <<-\EOF && + latin1 + utf8 + EOF + git log --encoding=ISO-8859-1 --format=%s --grep=$latin1_e >actual && + test_cmp expect actual +' + +test_expect_success 'log --grep does not find non-reencoded values (utf8)' ' + >expect && + git log --encoding=utf8 --format=%s --grep=$latin1_e >actual && + test_cmp expect actual +' + +test_expect_success 'log --grep does not find non-reencoded values (latin1)' ' + >expect && + git log --encoding=ISO-8859-1 --format=%s --grep=$utf8_e >actual && + test_cmp expect actual +' + +test_done