diff-lib.c: adjust position of i-t-a entries in diff
authorNguyễn Thái Ngọc Duy <pclouds@gmail.com>
Mon, 16 Mar 2015 13:56:46 +0000 (20:56 +0700)
committerJunio C Hamano <gitster@pobox.com>
Mon, 23 Mar 2015 20:42:33 +0000 (13:42 -0700)
Entries added by "git add -N" are reminder for the user so that they
don't forget to add them before committing. These entries appear in
the index even though they are not real. Their presence in the index
leads to a confusing "git status" like this:

On branch master
Changes to be committed:
new file: foo

Changes not staged for commit:
modified: foo

If you do a "git commit", "foo" will not be included even though
"status" reports it as "to be committed". This patch changes the
output to become

On branch master
Changes not staged for commit:
new file: foo

no changes added to commit

The two hunks in diff-lib.c adjust "diff-index" and "diff-files" so
that i-t-a entries appear as new files in diff-files and nothing in
diff-index.

Due to this change, diff-files may start to report "new files" for the
first time. "add -u" needs to be told about this or it will die in
denial, screaming "new files can't exist! Reality is wrong." Luckily,
it's the only one among run_diff_files() callers that needs fixing.

Now in the new world order, a hierarchy in the index that contain
i-t-a paths is written out as a tree object as if these i-t-a
entries do not exist, and comparing the index with such a tree
object that would result from writing out the hierarchy will result
in no difference. Update a test in t2203 that expected the i-t-a
entries to appear as "added to the index" in the comparison to
instead expect no output.

An earlier change eec3e7e4 (cache-tree: invalidate i-t-a paths after
generating trees, 2012-12-16) becomes an unnecessary pessimization
in the new world order---a cache-tree in the index that corresponds
to a hierarchy with i-t-a paths can now be marked as valid and
record the object name of the tree that results from writing a tree
object out of that hierarchy, as it will compare equal to that tree.

Reverting the commit is left for the future, though, as it is purely
a performance issue and no longer affects correctness.

Helped-by: Michael J Gruber <git@drmicha.warpmail.net>
Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
builtin/add.c
diff-lib.c
t/t2203-add-intent.sh
t/t4011-diff-symlink.sh
index 3390933d68b2dd6c7296a7d2103d009fa27f2ca8..ee370b059adfd106c70e2c4aa4df50663cb4a8ec 100644 (file)
@@ -63,6 +63,7 @@ static void update_callback(struct diff_queue_struct *q,
                switch (fix_unmerged_status(p, data)) {
                default:
                        die(_("unexpected diff status %c"), p->status);
+               case DIFF_STATUS_ADDED:
                case DIFF_STATUS_MODIFIED:
                case DIFF_STATUS_TYPE_CHANGED:
                        if (add_file_to_index(&the_index, path, data->flags)) {
index a85c4971ac8ece6397c05d0674bbac8c75cf219f..714501a7a3e13129d9de3a57b5e4637c18449f48 100644 (file)
@@ -212,6 +212,11 @@ int run_diff_files(struct rev_info *revs, unsigned int option)
                                               ce->sha1, !is_null_sha1(ce->sha1),
                                               ce->name, 0);
                                continue;
+                       } else if (ce->ce_flags & CE_INTENT_TO_ADD) {
+                               diff_addremove(&revs->diffopt, '+', ce->ce_mode,
+                                              EMPTY_BLOB_SHA1_BIN, 0,
+                                              ce->name, 0);
+                               continue;
                        }
 
                        changed = match_stat_with_submodule(&revs->diffopt, ce, &st,
@@ -376,6 +381,13 @@ static void do_oneway_diff(struct unpack_trees_options *o,
        struct rev_info *revs = o->unpack_data;
        int match_missing, cached;
 
+       /* i-t-a entries do not actually exist in the index */
+       if (idx && (idx->ce_flags & CE_INTENT_TO_ADD)) {
+               idx = NULL;
+               if (!tree)
+                       return; /* nothing to diff.. */
+       }
+
        /* if the entry is not checked out, don't examine work tree */
        cached = o->index_only ||
                (idx && ((idx->ce_flags & CE_VALID) || ce_skip_worktree(idx)));
index 2a4a749b4fa3b07963a18b645d29ef774c01bbd1..7c641bfaf4565a97942a91793370da0ca6285fc3 100755 (executable)
@@ -5,10 +5,24 @@ test_description='Intent to add'
 . ./test-lib.sh
 
 test_expect_success 'intent to add' '
+       test_commit 1 &&
+       git rm 1.t &&
+       echo hello >1.t &&
        echo hello >file &&
        echo hello >elif &&
        git add -N file &&
-       git add elif
+       git add elif &&
+       git add -N 1.t
+'
+
+test_expect_success 'git status' '
+       git status --porcelain | grep -v actual >actual &&
+       cat >expect <<-\EOF &&
+       DA 1.t
+       A  elif
+        A file
+       EOF
+       test_cmp expect actual
 '
 
 test_expect_success 'check result of "add -N"' '
@@ -43,7 +57,8 @@ test_expect_success 'i-t-a entry is simply ignored' '
        git add -N nitfol &&
        git commit -m second &&
        test $(git ls-tree HEAD -- nitfol | wc -l) = 0 &&
-       test $(git diff --name-only HEAD -- nitfol | wc -l) = 1
+       test $(git diff --name-only HEAD -- nitfol | wc -l) = 0 &&
+       test $(git diff --name-only -- nitfol | wc -l) = 1
 '
 
 test_expect_success 'can commit with an unrelated i-t-a entry in index' '
@@ -72,13 +87,13 @@ test_expect_success 'cache-tree invalidates i-t-a paths' '
        : >dir/bar &&
        git add -N dir/bar &&
        git diff --cached --name-only >actual &&
-       echo dir/bar >expect &&
+       >expect &&
        test_cmp expect actual &&
 
        git write-tree >/dev/null &&
 
        git diff --cached --name-only >actual &&
-       echo dir/bar >expect &&
+       >expect &&
        test_cmp expect actual
 '
 
index 13e7f621ab79f95cc7c3057d9de5710813049102..7452fce0da94a257f289a9fad1e9d24dd1509195 100755 (executable)
@@ -139,11 +139,13 @@ test_expect_success SYMLINKS 'setup symlinks with attributes' '
 test_expect_success SYMLINKS 'symlinks do not respect userdiff config by path' '
        cat >expect <<-\EOF &&
        diff --git a/file.bin b/file.bin
-       index e69de29..d95f3ad 100644
-       Binary files a/file.bin and b/file.bin differ
+       new file mode 100644
+       index 0000000..d95f3ad
+       Binary files /dev/null and b/file.bin differ
        diff --git a/link.bin b/link.bin
-       index e69de29..dce41ec 120000
-       --- a/link.bin
+       new file mode 120000
+       index 0000000..dce41ec
+       --- /dev/null
        +++ b/link.bin
        @@ -0,0 +1 @@
        +file.bin