[PATCH] combined diff: correctly handle truncated file
- From
Thomas Rast <trast@student.ethz.ch>
- Date
- Apr 15, 2010, 12:59 UTC
- Message-ID
- <884b9b68a4478aceda580299c059a9a67417cb1c.1271336073.git.trast@student.ethz.ch>
- In-Reply-To
- <4BC6EECE.6060408@gestiweb.com>
Consider an evil merge of two commits A and B, both of which have a file 'foo', but the merge result does not have that file.
The combined-diff code learned in 4462731 (combine-diff: do not punt on removed or added files., 2006-02-06) to concisely show only the removal, since that is the evil part and the previous contents are presumably uninteresting.
However, to diagnose an empty merge result, it overloaded the variable that holds the file's length. This means that the check also triggers for truncated files. Consequently, such files were not shown in the diff at all despite the merge being clearly evil.
Fix this by adding a new variable that distinguishes whether the file was deleted (which is the case 4462731 handled) or truncated. In the truncated case, we show the full combined diff again, which is rather spammy but at least does not hide the evilness.
Reported-by: David Martínez Martí <desarrollo@gestiweb.com> Signed-off-by: Thomas Rast <trast@student.ethz.ch> --- combine-diff.c | 14 ++++++++------ t/t4038-diff-combined.sh | 8 ++++++++ 2 files changed, 16 insertions(+), 6 deletions(-)
diff --git a/combine-diff.c b/combine-diff.c index 6162691..3480dae 100644 --- a/combine-diff.c +++ b/combine-diff.c @@ -204,7 +204,7 @@ static void consume_line(void *state_, char *line, unsigned long len) static void combine_diff(const unsigned char *parent, unsigned int mode, mmfile_t *result_file, struct sline *sline, unsigned int cnt, int n, - int num_parent) + int num_parent, int result_deleted) { unsigned int p_lno, lno; unsigned long nmask = (1UL << n); @@ -215,7 +215,7 @@ static void combine_diff(const unsigned char *parent, unsigned int mode, struct combine_diff_state state; unsigned long sz; - if (!cnt) + if (result_deleted) return; /* result deleted */ parent_file.ptr = grab_blob(parent, mode, &sz); @@ -517,7 +517,7 @@ static void show_line_to_eol(const char *line, int len, const char *reset) } static void dump_sline(struct sline *sline, unsigned long cnt, int num_parent, - int use_color) + int use_color, int result_deleted) { unsigned long mark = (1UL<<num_parent); unsigned long no_pre_delete = (2UL<<num_parent); @@ -530,7 +530,7 @@ static void dump_sline(struct sline *sline, unsigned long cnt, int num_parent, const char *c_plain = diff_get_color(use_color, DIFF_PLAIN); const char *c_reset = diff_get_color(use_color, DIFF_RESET); - if (!cnt) + if (result_deleted) return; /* result deleted */ while (1) { @@ -687,6 +687,7 @@ static void show_patch_diff(struct combine_diff_path *elem, int num_parent, { struct diff_options *opt = &rev->diffopt; unsigned long result_size, cnt, lno; + int result_deleted = 0; char *result, *cp; struct sline *sline; /* survived lines */ int mode_differs = 0; @@ -767,6 +768,7 @@ static void show_patch_diff(struct combine_diff_path *elem, int num_parent, } else { deleted_file: + result_deleted = 1; result_size = 0; elem->mode = 0; result = xcalloc(1, 1); @@ -823,7 +825,7 @@ static void show_patch_diff(struct combine_diff_path *elem, int num_parent, combine_diff(elem->parent[i].sha1, elem->parent[i].mode, &result_file, sline, - cnt, i, num_parent); + cnt, i, num_parent, result_deleted); if (elem->parent[i].mode != elem->mode) mode_differs = 1; } @@ -889,7 +891,7 @@ static void show_patch_diff(struct combine_diff_path *elem, int num_parent, dump_quoted_path("+++ ", b_prefix, elem->path, c_meta, c_reset); dump_sline(sline, cnt, num_parent, - DIFF_OPT_TST(opt, COLOR_DIFF)); + DIFF_OPT_TST(opt, COLOR_DIFF), result_deleted); } free(result); diff --git a/t/t4038-diff-combined.sh b/t/t4038-diff-combined.sh index 7584efa..09e8c8a 100755 --- a/t/t4038-diff-combined.sh +++ b/t/t4038-diff-combined.sh @@ -81,4 +81,12 @@ test_expect_success 'check combined output (2)' ' verify_helper sidesansone ' +test_expect_success 'diagnose truncated file' ' + : > file && + git add file && + git commit --amend -C HEAD && + git show > out && + grep "diff --cc file" out +' + test_done
-- 1.7.1.rc1.265.g77471