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merge-tree: add comments to clarify what these functions are doing

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Rename the "branch1" parameter given to resolve() to "ours", to
clarify what is going on.  Also, annotate the unresolved_directory()
function with some comments to show what decisions are made in each
step, and highlight two bugs that need to be fixed.

Add two tests to t4300 to illustrate these bugs.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano 2012-12-06 16:15:45 -08:00
parent 3b8ff51b70
commit 8dd15c6a90
2 changed files with 66 additions and 4 deletions
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26
builtin/merge-tree.c
View file

@ -172,17 +172,17 @@ static char *traverse_path(const struct traverse_info *info, const struct name_e
return make_traverse_path(path, info, n);
}
static void resolve(const struct traverse_info *info, struct name_entry *branch1, struct name_entry *result)
static void resolve(const struct traverse_info *info, struct name_entry *ours, struct name_entry *result)
{
struct merge_list *orig, *final;
const char *path;
/* If it's already branch1, don't bother showing it */
if (!branch1)
/* If it's already ours, don't bother showing it */
if (!ours)
return;
path = traverse_path(info, result);
orig = create_entry(2, branch1->mode, branch1->sha1, path);
orig = create_entry(2, ours->mode, ours->sha1, path);
final = create_entry(0, result->mode, result->sha1, path);
final->link = orig;
@ -205,6 +205,15 @@ static int unresolved_directory(const struct traverse_info *info, struct name_en
}
if (!S_ISDIR(p->mode))
return 0;
/*
* NEEDSWORK: this is broken. The path can originally be a file
* and then one side may have turned it into a directory, in which
* case we return and let the three-way merge as if the tree were
* a regular file. If the path that was originally a tree is
* now a file in either branch, fill_tree_descriptor() below will
* die when fed a blob sha1.
*/
newbase = traverse_path(info, p);
buf0 = fill_tree_descriptor(t+0, n[0].sha1);
buf1 = fill_tree_descriptor(t+1, n[1].sha1);
@ -288,20 +297,29 @@ static int threeway_callback(int n, unsigned long mask, unsigned long dirmask, s
/* Same in both? */
if (same_entry(entry+1, entry+2)) {
if (entry[0].sha1) {
/* Modified identically */
resolve(info, NULL, entry+1);
return mask;
}
/* "Both added the same" is left unresolved */
}
if (same_entry(entry+0, entry+1)) {
if (entry[2].sha1 && !S_ISDIR(entry[2].mode)) {
/* We did not touch, they modified -- take theirs */
resolve(info, entry+1, entry+2);
return mask;
}
/*
* If we did not touch a directory but they made it
* into a file, we fall through and unresolved()
* recurses down. Likewise for the opposite case.
*/
}
if (same_entry(entry+0, entry+2)) {
if (entry[1].sha1 && !S_ISDIR(entry[1].mode)) {
/* We modified, they did not touch -- take ours */
resolve(info, NULL, entry+1);
return mask;
}

44
t/t4300-merge-tree.sh
View file

@ -254,4 +254,48 @@ EXPECTED
test_cmp expected actual
'
test_expect_failure 'turn file to tree' '
git reset --hard initial &&
rm initial-file &&
mkdir initial-file &&
test_commit "turn-file-to-tree" "initial-file/ONE" "CCC" &&
git merge-tree initial initial turn-file-to-tree >actual &&
cat >expect <<-\EOF &&
added in remote
their 100644 43aa4fdec31eb92e1fdc2f0ce6ea9ddb7c32bcf7 initial-file/ONE
@@ -0,0 +1 @@
+CCC
removed in remote
base 100644 e79c5e8f964493290a409888d5413a737e8e5dd5 initial-file
our 100644 e79c5e8f964493290a409888d5413a737e8e5dd5 initial-file
@@ -1 +0,0 @@
-initial
EOF
test_cmp expect actual
'
test_expect_failure 'turn tree to file' '
git reset --hard initial &&
mkdir dir &&
test_commit "add-tree" "dir/path" "AAA" &&
test_commit "add-another-tree" "dir/another" "BBB" &&
rm -fr dir &&
test_commit "make-file" "dir" "CCC" &&
git merge-tree add-tree add-another-tree make-file >actual &&
cat >expect <<-\EOF &&
added in local
our 100644 ba629238ca89489f2b350e196ca445e09d8bb834 dir/another
removed in remote
base 100644 43d5a8ed6ef6c00ff775008633f95787d088285d dir/path
our 100644 43d5a8ed6ef6c00ff775008633f95787d088285d dir/path
@@ -1 +0,0 @@
-AAA
added in remote
their 100644 43aa4fdec31eb92e1fdc2f0ce6ea9ddb7c32bcf7 dir
@@ -0,0 +1 @@
+CCC
EOF
test_cmp expect actual
'
test_done