[PATCH v2] cache-tree: do not try to use an invalidated subtree info to build a tree

[Junio C Hamano <gitster@pobox.com>]

We punt from repairing the cache-tree during a branch switching if
it involves having to create a new tree object that does not yet
exist in the object store.  "mkdir dir && >dir/file && git add dir"
followed by "git checkout" is one example, when a tree that records
the state of such "dir/" is not in the object store.

However, after discovering that we do not have a tree object that
records the state of "dir/", the caller failed to remember the fact
that it noticed the cache-tree entry it received for "dir/" is
invalidated, it already knows it should not be populating the level
callchain to stop the code to attempt populating the level that has
"dir/" as its immediate subdirectory, and it is not an error at all
for the sublevel cache-tree entry gave it a bogus object name it
shouldn't even look at.

This led the caller detect and report a non-existent error.  The end
result was the same and we avoided stuffing a non-existent tree to
the cache-tree, but we shouldn't have issued an alarming error
message to the user.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---

 * Second try.  The level that has intent-to-add entries needs to be
   kept invalidated but the level above it needs to treat as if the
   i-t-a entries do not exist and build the whole tree; a directory
   that does not yet have corresponding tree object while repairing
   the cache-tree needs to invalidate itself *and* propagate the
   (in)validity upwards.  They have to be treated differently but
   the first attempt failed to do so.

 cache-tree.c          | 7 ++++++-
 t/t0090-cache-tree.sh | 8 ++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/cache-tree.c b/cache-tree.c
index f951d7d..57597ac 100644
--- a/cache-tree.c
+++ b/cache-tree.c
@@ -316,6 +316,7 @@ static int update_one(struct cache_tree *it,
 		int pathlen, entlen;
 		const unsigned char *sha1;
 		unsigned mode;
+		int expected_missing = 0;
 
 		path = ce->name;
 		pathlen = ce_namelen(ce);
@@ -332,8 +333,10 @@ static int update_one(struct cache_tree *it,
 			i += sub->count;
 			sha1 = sub->cache_tree->sha1;
 			mode = S_IFDIR;
-			if (sub->cache_tree->entry_count < 0)
+			if (sub->cache_tree->entry_count < 0) {
 				to_invalidate = 1;
+				expected_missing = 1;
+			}
 		}
 		else {
 			sha1 = ce->sha1;
@@ -343,6 +346,8 @@ static int update_one(struct cache_tree *it,
 		}
 		if (mode != S_IFGITLINK && !missing_ok && !has_sha1_file(sha1)) {
 			strbuf_release(&buffer);
+			if (expected_missing)
+				return -1;
 			return error("invalid object %06o %s for '%.*s'",
 				mode, sha1_to_hex(sha1), entlen+baselen, path);
 		}
diff --git a/t/t0090-cache-tree.sh b/t/t0090-cache-tree.sh
index 48c4240..f9648a8 100755
--- a/t/t0090-cache-tree.sh
+++ b/t/t0090-cache-tree.sh
@@ -210,4 +210,12 @@ test_expect_success 'partial commit gives cache-tree' '
 	test_cache_tree
 '
 
+test_expect_success 'no phantom error when switching trees' '
+	mkdir newdir &&
+	>newdir/one &&
+	git add newdir/one &&
+	git checkout 2>errors &&
+	! test -s errors
+'
+
 test_done
-- 
2.1.0-391-g57244f3