The previous commit documented two known breakages revolving around
a case where one side flips a tree into a blob (or vice versa),
where the original code simply gets confused and feeds a mixture of
trees and blobs into either the recursive merge-tree (and recursing
into the blob will fail) or three-way merge (and merging tree contents
together with blobs will fail).
Fix it by feeding trees (and only trees) into the recursive
merge-tree machinery and blobs (and only blobs) into the three-way
content level merge machinery separately; when this happens, the
entire merge has to be marked as conflicting at the structure level.
Signed-off-by: Junio C Hamano <gitster@xxxxxxxxx>
---
builtin/merge-tree.c | 72 ++++++++++++++++++++++++++++-----------------------
t/t4300-merge-tree.sh | 4 +--
2 files changed, 42 insertions(+), 34 deletions(-)
diff --git a/builtin/merge-tree.c b/builtin/merge-tree.c
index 5704d51..e0d0b7d 100644
--- a/builtin/merge-tree.c
+++ b/builtin/merge-tree.c
@@ -25,7 +25,7 @@ static void add_merge_entry(struct merge_list *entry)
merge_result_end = &entry->next;
}
-static void merge_trees(struct tree_desc t[3], const char *base);
+static void merge_trees_recursive(struct tree_desc t[3], const char *base, int df_conflict);
static const char *explanation(struct merge_list *entry)
{
@@ -190,41 +190,35 @@ static void resolve(const struct traverse_info *info, struct name_entry *ours, s
add_merge_entry(final);
}
-static int unresolved_directory(const struct traverse_info *info, struct name_entry n[3])
+static void unresolved_directory(const struct traverse_info *info, struct name_entry n[3],
+ int df_conflict)
{
char *newbase;
struct name_entry *p;
struct tree_desc t[3];
void *buf0, *buf1, *buf2;
- p = n;
- if (!p->mode) {
- p++;
- if (!p->mode)
- p++;
+ for (p = n; p < n + 3; p++) {
+ if (p->mode && S_ISDIR(p->mode))
+ break;
}
- 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.
- */
+ if (n + 3 <= p)
+ return; /* there is no tree here */
newbase = traverse_path(info, p);
- buf0 = fill_tree_descriptor(t+0, n[0].sha1);
- buf1 = fill_tree_descriptor(t+1, n[1].sha1);
- buf2 = fill_tree_descriptor(t+2, n[2].sha1);
- merge_trees(t, newbase);
+
+#define ENTRY_SHA1(e) (((e)->mode && S_ISDIR((e)->mode)) ? (e)->sha1 : NULL)
+ buf0 = fill_tree_descriptor(t+0, ENTRY_SHA1(n + 0));
+ buf1 = fill_tree_descriptor(t+1, ENTRY_SHA1(n + 1));
+ buf2 = fill_tree_descriptor(t+2, ENTRY_SHA1(n + 2));
+#undef ENTRY_SHA1
+
+ merge_trees_recursive(t, newbase, df_conflict);
free(buf0);
free(buf1);
free(buf2);
free(newbase);
- return 1;
}
@@ -247,18 +241,26 @@ static struct merge_list *link_entry(unsigned stage, const struct traverse_info
static void unresolved(const struct traverse_info *info, struct name_entry n[3])
{
struct merge_list *entry = NULL;
+ int i;
+ unsigned dirmask = 0, mask = 0;
+
+ for (i = 0; i < 3; i++) {
+ mask |= (1 << 1);
+ if (n[i].mode && S_ISDIR(n[i].mode))
+ dirmask |= (1 << i);
+ }
+
+ unresolved_directory(info, n, dirmask && (dirmask != mask));
- if (unresolved_directory(info, n))
+ if (dirmask == mask)
return;
- /*
- * Do them in reverse order so that the resulting link
- * list has the stages in order - link_entry adds new
- * links at the front.
- */
- entry = link_entry(3, info, n + 2, entry);
- entry = link_entry(2, info, n + 1, entry);
- entry = link_entry(1, info, n + 0, entry);
+ if (n[2].mode && !S_ISDIR(n[2].mode))
+ entry = link_entry(3, info, n + 2, entry);
+ if (n[1].mode && !S_ISDIR(n[1].mode))
+ entry = link_entry(2, info, n + 1, entry);
+ if (n[0].mode && !S_ISDIR(n[0].mode))
+ entry = link_entry(1, info, n + 0, entry);
add_merge_entry(entry);
}
@@ -329,15 +331,21 @@ static int threeway_callback(int n, unsigned long mask, unsigned long dirmask, s
return mask;
}
-static void merge_trees(struct tree_desc t[3], const char *base)
+static void merge_trees_recursive(struct tree_desc t[3], const char *base, int df_conflict)
{
struct traverse_info info;
setup_traverse_info(&info, base);
+ info.data = &df_conflict;
info.fn = threeway_callback;
traverse_trees(3, t, &info);
}
+static void merge_trees(struct tree_desc t[3], const char *base)
+{
+ merge_trees_recursive(t, base, 0);
+}
+
static void *get_tree_descriptor(struct tree_desc *desc, const char *rev)
{
unsigned char sha1[20];
diff --git a/t/t4300-merge-tree.sh b/t/t4300-merge-tree.sh
index 03e8fca..d0b2a45 100755
--- a/t/t4300-merge-tree.sh
+++ b/t/t4300-merge-tree.sh
@@ -254,7 +254,7 @@ EXPECTED
test_cmp expected actual
'
-test_expect_failure 'turn file to tree' '
+test_expect_success 'turn file to tree' '
git reset --hard initial &&
rm initial-file &&
mkdir initial-file &&
@@ -274,7 +274,7 @@ test_expect_failure 'turn file to tree' '
test_cmp expect actual
'
-test_expect_failure 'turn tree to file' '
+test_expect_success 'turn tree to file' '
git reset --hard initial &&
mkdir dir &&
test_commit "add-tree" "dir/path" "AAA" &&
--
1.8.1.rc3.356.g686f81c
--
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