[PATCH v8 1/4] cache-tree: Create/update cache-tree on checkout

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8 messages, 3 authors, 2016-06-15 · open the first message on its own page

[PATCH v8 1/4] cache-tree: Create/update cache-tree on checkout

From: David Turner <hidden>
Date: 2016-06-15 23:01:54

When git checkout checks out a branch, create or update the
cache-tree so that subsequent operations are faster.

update_main_cache_tree learned a new flag, WRITE_TREE_REPAIR.  When
WRITE_TREE_REPAIR is set, portions of the cache-tree which do not
correspond to existing tree objects are invalidated (and portions which
do are marked as valid).  No new tree objects are created.

Signed-off-by: David Turner <redacted>
---
 builtin/checkout.c    |  8 ++++++++
 cache-tree.c          | 12 +++++++++++-
 cache-tree.h          |  1 +
 t/t0090-cache-tree.sh | 19 ++++++++++++++++---
 4 files changed, 36 insertions(+), 4 deletions(-)

diff --git a/builtin/checkout.c b/builtin/checkout.c
index 07cf555..054214f 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c

@@ -553,6 +553,14 @@ static int merge_working_tree(const struct checkout_opts *opts,
 		}
 	}
 
+	if (!active_cache_tree)
+		active_cache_tree = cache_tree();
+
+	if (!cache_tree_fully_valid(active_cache_tree))
+		cache_tree_update(active_cache_tree,
+				  (const struct cache_entry * const *)active_cache,
+				  active_nr, WRITE_TREE_SILENT | WRITE_TREE_REPAIR);
+
 	if (write_cache(newfd, active_cache, active_nr) ||
 	    commit_locked_index(lock_file))
 		die(_("unable to write new index file"));

diff --git a/cache-tree.c b/cache-tree.c
index 7fa524a..f951d7d 100644
--- a/cache-tree.c
+++ b/cache-tree.c

@@ -239,9 +239,12 @@ static int update_one(struct cache_tree *it,
 	struct strbuf buffer;
 	int missing_ok = flags & WRITE_TREE_MISSING_OK;
 	int dryrun = flags & WRITE_TREE_DRY_RUN;
+	int repair = flags & WRITE_TREE_REPAIR;
 	int to_invalidate = 0;
 	int i;
 
+	assert(!(dryrun && repair));
+
 	*skip_count = 0;
 
 	if (0 <= it->entry_count && has_sha1_file(it->sha1))

@@ -374,7 +377,14 @@ static int update_one(struct cache_tree *it,
 #endif
 	}
 
-	if (dryrun)
+	if (repair) {
+		unsigned char sha1[20];
+		hash_sha1_file(buffer.buf, buffer.len, tree_type, sha1);
+		if (has_sha1_file(sha1))
+			hashcpy(it->sha1, sha1);
+		else
+			to_invalidate = 1;
+	} else if (dryrun)
 		hash_sha1_file(buffer.buf, buffer.len, tree_type, it->sha1);
 	else if (write_sha1_file(buffer.buf, buffer.len, tree_type, it->sha1)) {
 		strbuf_release(&buffer);

diff --git a/cache-tree.h b/cache-tree.h
index f1923ad..666d18f 100644
--- a/cache-tree.h
+++ b/cache-tree.h

@@ -39,6 +39,7 @@ int update_main_cache_tree(int);
 #define WRITE_TREE_IGNORE_CACHE_TREE 2
 #define WRITE_TREE_DRY_RUN 4
 #define WRITE_TREE_SILENT 8
+#define WRITE_TREE_REPAIR 16
 
 /* error return codes */
 #define WRITE_TREE_UNREADABLE_INDEX (-1)

diff --git a/t/t0090-cache-tree.sh b/t/t0090-cache-tree.sh
index 6c33e28..98fb1ab 100755
--- a/t/t0090-cache-tree.sh
+++ b/t/t0090-cache-tree.sh

@@ -44,14 +44,14 @@ test_expect_success 'read-tree HEAD establishes cache-tree' '
 
 test_expect_success 'git-add invalidates cache-tree' '
 	test_when_finished "git reset --hard; git read-tree HEAD" &&
-	echo "I changed this file" > foo &&
+	echo "I changed this file" >foo &&
 	git add foo &&
 	test_invalid_cache_tree
 '
 
 test_expect_success 'update-index invalidates cache-tree' '
 	test_when_finished "git reset --hard; git read-tree HEAD" &&
-	echo "I changed this file" > foo &&
+	echo "I changed this file" >foo &&
 	git update-index --add foo &&
 	test_invalid_cache_tree
 '

@@ -85,9 +85,22 @@ test_expect_success 'reset --hard without index gives cache-tree' '
 	test_shallow_cache_tree
 '
 
-test_expect_failure 'checkout gives cache-tree' '
+test_expect_success 'checkout gives cache-tree' '
+	git tag current &&
 	git checkout HEAD^ &&
 	test_shallow_cache_tree
 '
 
+test_expect_success 'checkout -b gives cache-tree' '
+	git checkout current &&
+	git checkout -b prev HEAD^ &&
+	test_shallow_cache_tree
+'
+
+test_expect_success 'checkout -B gives cache-tree' '
+	git checkout current &&
+	git checkout -B prev HEAD^ &&
+	test_shallow_cache_tree
+'
+
 test_done

-- 
2.0.0.390.gcb682f8

[PATCH v8 2/4] test-dump-cache-tree: invalid trees are not errors

From: David Turner <hidden>
Date: 2016-06-15 23:01:54

Do not treat known-invalid trees as errors even when their subtree_nr is
incorrect.  Because git already knows that these trees are invalid,
an incorrect subtree_nr will not cause problems.

Add a couple of comments.

Signed-off-by: David Turner <redacted>
---
 test-dump-cache-tree.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/test-dump-cache-tree.c b/test-dump-cache-tree.c
index 47eab97..cbbbd8e 100644
--- a/test-dump-cache-tree.c
+++ b/test-dump-cache-tree.c

@@ -26,16 +26,16 @@ static int dump_cache_tree(struct cache_tree *it,
 		return 0;
 
 	if (it->entry_count < 0) {
+		/* invalid */
 		dump_one(it, pfx, "");
 		dump_one(ref, pfx, "#(ref) ");
-		if (it->subtree_nr != ref->subtree_nr)
-			errs = 1;
 	}
 	else {
 		dump_one(it, pfx, "");
 		if (hashcmp(it->sha1, ref->sha1) ||
 		    ref->entry_count != it->entry_count ||
 		    ref->subtree_nr != it->subtree_nr) {
+			/* claims to be valid but is lying */
 			dump_one(ref, pfx, "#(ref) ");
 			errs = 1;
 		}

-- 
2.0.0.390.gcb682f8

[PATCH v8 3/4] cache-tree: subdirectory tests

From: David Turner <hidden>
Date: 2016-06-15 23:01:54

Add tests to confirm that invalidation of subdirectories neither over-
nor under-invalidates.

Signed-off-by: David Turner <redacted>
---
 t/t0090-cache-tree.sh | 26 +++++++++++++++++++++++---
 1 file changed, 23 insertions(+), 3 deletions(-)

diff --git a/t/t0090-cache-tree.sh b/t/t0090-cache-tree.sh
index 98fb1ab..3a3342e 100755
--- a/t/t0090-cache-tree.sh
+++ b/t/t0090-cache-tree.sh

@@ -22,9 +22,10 @@ test_shallow_cache_tree () {
 }
 
 test_invalid_cache_tree () {
-	echo "invalid                                   (0 subtrees)" >expect &&
-	printf "SHA #(ref)  (%d entries, 0 subtrees)\n" $(git ls-files|wc -l) >>expect &&
-	cmp_cache_tree expect
+	printf "invalid                                  %s ()\n" "" "$@" >expect &&
+	test-dump-cache-tree | \
+	sed -n -e "s/[0-9]* subtrees//" -e '/#(ref)/d' -e '/^invalid /p' >actual &&
+	test_cmp expect actual
 }
 
 test_no_cache_tree () {

@@ -49,6 +50,25 @@ test_expect_success 'git-add invalidates cache-tree' '
 	test_invalid_cache_tree
 '
 
+test_expect_success 'git-add in subdir invalidates cache-tree' '
+	test_when_finished "git reset --hard; git read-tree HEAD" &&
+	mkdir dirx &&
+	echo "I changed this file" >dirx/foo &&
+	git add dirx/foo &&
+	test_invalid_cache_tree
+'
+
+test_expect_success 'git-add in subdir does not invalidate sibling cache-tree' '
+	git tag no-children &&
+	test_when_finished "git reset --hard no-children; git read-tree HEAD" &&
+	mkdir dir1 dir2 &&
+	test_commit dir1/a &&
+	test_commit dir2/b &&
+	echo "I changed this file" >dir1/a &&
+	git add dir1/a &&
+	test_invalid_cache_tree dir1/
+'
+
 test_expect_success 'update-index invalidates cache-tree' '
 	test_when_finished "git reset --hard; git read-tree HEAD" &&
 	echo "I changed this file" >foo &&

-- 
2.0.0.390.gcb682f8

[PATCH v8 4/4] cache-tree: Write updated cache-tree after commit

From: David Turner <hidden>
Date: 2016-06-15 23:01:54

During the commit process, update the cache-tree. Write this updated
cache-tree so that it's ready for subsequent commands.

Add test code which demonstrates that git commit now writes the cache
tree.  Make all tests test the entire cache-tree, not just the root
level.

Signed-off-by: David Turner <redacted>
---
 builtin/commit.c      |  16 ++++++-
 t/t0090-cache-tree.sh | 117 +++++++++++++++++++++++++++++++++++++++++++-------
 2 files changed, 117 insertions(+), 16 deletions(-)

diff --git a/builtin/commit.c b/builtin/commit.c
index 9cfef6c..d6681c4 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c

@@ -342,6 +342,15 @@ static char *prepare_index(int argc, const char **argv, const char *prefix,
 
 		discard_cache();
 		read_cache_from(index_lock.filename);
+		if (update_main_cache_tree(WRITE_TREE_SILENT) == 0) {
+			fd = open(index_lock.filename, O_WRONLY);
+			if (fd >= 0)
+				if (write_cache(fd, active_cache, active_nr) == 0) {
+					close_lock_file(&index_lock);
+			}
+		}
+		else
+			fprintf(stderr, "FAiled to update main cache tree\n");
 
 		commit_style = COMMIT_NORMAL;
 		return index_lock.filename;

@@ -383,8 +392,12 @@ static char *prepare_index(int argc, const char **argv, const char *prefix,
 	if (!only && !pathspec.nr) {
 		fd = hold_locked_index(&index_lock, 1);
 		refresh_cache_or_die(refresh_flags);
-		if (active_cache_changed) {
+		if (active_cache_changed
+		    || !cache_tree_fully_valid(active_cache_tree)) {
 			update_main_cache_tree(WRITE_TREE_SILENT);
+			active_cache_changed = 1;
+		}
+		if (active_cache_changed) {
 			if (write_cache(fd, active_cache, active_nr) ||
 			    commit_locked_index(&index_lock))
 				die(_("unable to write new_index file"));

@@ -435,6 +448,7 @@ static char *prepare_index(int argc, const char **argv, const char *prefix,
 	fd = hold_locked_index(&index_lock, 1);
 	add_remove_files(&partial);
 	refresh_cache(REFRESH_QUIET);
+	update_main_cache_tree(WRITE_TREE_SILENT);
 	if (write_cache(fd, active_cache, active_nr) ||
 	    close_lock_file(&index_lock))
 		die(_("unable to write new_index file"));

diff --git a/t/t0090-cache-tree.sh b/t/t0090-cache-tree.sh
index 3a3342e..48c4240 100755
--- a/t/t0090-cache-tree.sh
+++ b/t/t0090-cache-tree.sh

@@ -8,7 +8,7 @@ cache-tree extension.
  . ./test-lib.sh
 
 cmp_cache_tree () {
-	test-dump-cache-tree >actual &&
+	test-dump-cache-tree | sed -e '/#(ref)/d' >actual &&
 	sed "s/$_x40/SHA/" <actual >filtered &&
 	test_cmp "$1" filtered
 }

@@ -16,14 +16,38 @@ cmp_cache_tree () {
 # We don't bother with actually checking the SHA1:
 # test-dump-cache-tree already verifies that all existing data is
 # correct.
-test_shallow_cache_tree () {
-	printf "SHA  (%d entries, 0 subtrees)\n" $(git ls-files|wc -l) >expect &&
+generate_expected_cache_tree_rec () {
+	dir="$1${1:+/}" &&
+	parent="$2" &&
+	# ls-files might have foo/bar, foo/bar/baz, and foo/bar/quux
+	# We want to count only foo because it's the only direct child
+	subtrees=$(git ls-files|grep /|cut -d / -f 1|uniq) &&
+	subtree_count=$(echo "$subtrees"|awk '$1 {++c} END {print c}') &&
+	entries=$(git ls-files|wc -l) &&
+	printf "SHA $dir (%d entries, %d subtrees)\n" "$entries" "$subtree_count" &&
+	for subtree in $subtrees
+	do
+		cd "$subtree"
+		generate_expected_cache_tree_rec "$dir$subtree" "$dir" || return 1
+		cd ..
+	done &&
+	dir=$parent
+}
+
+generate_expected_cache_tree () {
+	(
+		generate_expected_cache_tree_rec
+	)
+}
+
+test_cache_tree () {
+	generate_expected_cache_tree >expect &&
 	cmp_cache_tree expect
 }
 
 test_invalid_cache_tree () {
 	printf "invalid                                  %s ()\n" "" "$@" >expect &&
-	test-dump-cache-tree | \
+	test-dump-cache-tree |
 	sed -n -e "s/[0-9]* subtrees//" -e '/#(ref)/d' -e '/^invalid /p' >actual &&
 	test_cmp expect actual
 }

@@ -33,14 +57,14 @@ test_no_cache_tree () {
 	cmp_cache_tree expect
 }
 
-test_expect_failure 'initial commit has cache-tree' '
+test_expect_success 'initial commit has cache-tree' '
 	test_commit foo &&
-	test_shallow_cache_tree
+	test_cache_tree
 '
 
 test_expect_success 'read-tree HEAD establishes cache-tree' '
 	git read-tree HEAD &&
-	test_shallow_cache_tree
+	test_cache_tree
 '
 
 test_expect_success 'git-add invalidates cache-tree' '

@@ -58,6 +82,18 @@ test_expect_success 'git-add in subdir invalidates cache-tree' '
 	test_invalid_cache_tree
 '
 
+cat >before <<\EOF
+SHA  (3 entries, 2 subtrees)
+SHA dir1/ (1 entries, 0 subtrees)
+SHA dir2/ (1 entries, 0 subtrees)
+EOF
+
+cat >expect <<\EOF
+invalid                                   (2 subtrees)
+invalid                                  dir1/ (0 subtrees)
+SHA dir2/ (1 entries, 0 subtrees)
+EOF
+
 test_expect_success 'git-add in subdir does not invalidate sibling cache-tree' '
 	git tag no-children &&
 	test_when_finished "git reset --hard no-children; git read-tree HEAD" &&

@@ -65,8 +101,10 @@ test_expect_success 'git-add in subdir does not invalidate sibling cache-tree' '
 	test_commit dir1/a &&
 	test_commit dir2/b &&
 	echo "I changed this file" >dir1/a &&
+	cmp_cache_tree before &&
+	echo "I changed this file" >dir1/a &&
 	git add dir1/a &&
-	test_invalid_cache_tree dir1/
+	cmp_cache_tree expect
 '
 
 test_expect_success 'update-index invalidates cache-tree' '

@@ -79,7 +117,7 @@ test_expect_success 'update-index invalidates cache-tree' '
 test_expect_success 'write-tree establishes cache-tree' '
 	test-scrap-cache-tree &&
 	git write-tree &&
-	test_shallow_cache_tree
+	test_cache_tree
 '
 
 test_expect_success 'test-scrap-cache-tree works' '

@@ -90,37 +128,86 @@ test_expect_success 'test-scrap-cache-tree works' '
 
 test_expect_success 'second commit has cache-tree' '
 	test_commit bar &&
-	test_shallow_cache_tree
+	test_cache_tree
+'
+
+test_expect_success 'commit --interactive gives cache-tree on partial commit' '
+	cat <<-\EOT >foo.c &&
+	int foo()
+	{
+		return 42;
+	}
+	int bar()
+	{
+		return 42;
+	}
+	EOT
+	git add foo.c &&
+	test_invalid_cache_tree &&
+	git commit -m "add a file" &&
+	test_cache_tree &&
+	cat <<-\EOT >foo.c &&
+	int foo()
+	{
+		return 43;
+	}
+	int bar()
+	{
+		return 44;
+	}
+	EOT
+	(echo p; echo 1; echo; echo s; echo n; echo y; echo q) |
+	git commit --interactive -m foo &&
+	test_cache_tree
+'
+
+test_expect_success 'commit in child dir has cache-tree' '
+	mkdir dir &&
+	>dir/child.t &&
+	git add dir/child.t &&
+	git commit -m dir/child.t &&
+	test_cache_tree
 '
 
 test_expect_success 'reset --hard gives cache-tree' '
 	test-scrap-cache-tree &&
 	git reset --hard &&
-	test_shallow_cache_tree
+	test_cache_tree
 '
 
 test_expect_success 'reset --hard without index gives cache-tree' '
 	rm -f .git/index &&
 	git reset --hard &&
-	test_shallow_cache_tree
+	test_cache_tree
 '
 
 test_expect_success 'checkout gives cache-tree' '
 	git tag current &&
 	git checkout HEAD^ &&
-	test_shallow_cache_tree
+	test_cache_tree
 '
 
 test_expect_success 'checkout -b gives cache-tree' '
 	git checkout current &&
 	git checkout -b prev HEAD^ &&
-	test_shallow_cache_tree
+	test_cache_tree
 '
 
 test_expect_success 'checkout -B gives cache-tree' '
 	git checkout current &&
 	git checkout -B prev HEAD^ &&
-	test_shallow_cache_tree
+	test_cache_tree
+'
+
+test_expect_success 'partial commit gives cache-tree' '
+	git checkout -b partial no-children &&
+	test_commit one &&
+	test_commit two &&
+	echo "some change" >one.t &&
+	git add one.t &&
+	echo "some other change" >two.t &&
+	git commit two.t -m partial &&
+	test_cache_tree
 '
 
 test_done

-- 
2.0.0.390.gcb682f8

Re: [PATCH v8 4/4] cache-tree: Write updated cache-tree after commit

From: Duy Nguyen <hidden>
Date: 2016-06-15 23:01:54

On Sat, Jul 12, 2014 at 11:44 AM, David Turner [off-list ref] wrote:

quoted hunk

@@ -342,6 +342,15 @@ static char *prepare_index(int argc, const char **argv, const char *prefix,

                discard_cache();
                read_cache_from(index_lock.filename);
+               if (update_main_cache_tree(WRITE_TREE_SILENT) == 0) {
+                       fd = open(index_lock.filename, O_WRONLY);
+                       if (fd >= 0)
+                               if (write_cache(fd, active_cache, active_nr) == 0) {
+                                       close_lock_file(&index_lock);

If write_cache() returns a negative value, index.lock is probably
corrupted. Should we die() instead of moving on and returning
index_lock.filename to the caller? The caller may move index.lock to
index later on and officially ruin "index".

+                       }
+               }
+               else
+                       fprintf(stderr, "FAiled to update main cache tree\n");

make the above line something like this for i18n support:

fprintf_ln(stderr, _("Failed to update main cache tree"));

                commit_style = COMMIT_NORMAL;
                return index_lock.filename;

-- 
Duy

Re: [PATCH v8 1/4] cache-tree: Create/update cache-tree on checkou

From: John Keeping <hidden>
Date: 2016-06-15 23:02:24

On Fri, Jul 11, 2014 at 09:44:33PM -0700, David Turner wrote:

When git checkout checks out a branch, create or update the
cache-tree so that subsequent operations are faster.

update_main_cache_tree learned a new flag, WRITE_TREE_REPAIR.  When
WRITE_TREE_REPAIR is set, portions of the cache-tree which do not
correspond to existing tree objects are invalidated (and portions which
do are marked as valid).  No new tree objects are created.

Signed-off-by: David Turner <redacted>
---

This causes an incorrect error message to be printed when switching
branches with staged changes in a subdirectory.  The test case is pretty
simple:

	git init test &&
	cd test &&
	mkdir sub &&
	echo one >sub/one &&
	git add sub/one &&
	git commit -m one &&
	echo two >sub/two &&
	git add sub/two &&
	git checkout -b test

After this commit the output is:

	error: invalid object 040000 0000000000000000000000000000000000000000 for 'bar'
	A       bar/quux
	Switched to branch 'test'

but the "error:" line should not be there.

Everything still works, but I think the error message is a bit scary
considering that this isn't actually an error.

quoted hunk

 builtin/checkout.c    |  8 ++++++++
 cache-tree.c          | 12 +++++++++++-
 cache-tree.h          |  1 +
 t/t0090-cache-tree.sh | 19 ++++++++++++++++---
 4 files changed, 36 insertions(+), 4 deletions(-)

diff --git a/builtin/checkout.c b/builtin/checkout.c
index 07cf555..054214f 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c

@@ -553,6 +553,14 @@ static int merge_working_tree(const struct checkout_opts *opts,
 		}
 	}
 
+	if (!active_cache_tree)
+		active_cache_tree = cache_tree();
+
+	if (!cache_tree_fully_valid(active_cache_tree))
+		cache_tree_update(active_cache_tree,
+				  (const struct cache_entry * const *)active_cache,
+				  active_nr, WRITE_TREE_SILENT | WRITE_TREE_REPAIR);
+
 	if (write_cache(newfd, active_cache, active_nr) ||
 	    commit_locked_index(lock_file))
 		die(_("unable to write new index file"));

diff --git a/cache-tree.c b/cache-tree.c
index 7fa524a..f951d7d 100644
--- a/cache-tree.c
+++ b/cache-tree.c

@@ -239,9 +239,12 @@ static int update_one(struct cache_tree *it,
 	struct strbuf buffer;
 	int missing_ok = flags & WRITE_TREE_MISSING_OK;
 	int dryrun = flags & WRITE_TREE_DRY_RUN;
+	int repair = flags & WRITE_TREE_REPAIR;
 	int to_invalidate = 0;
 	int i;
 
+	assert(!(dryrun && repair));
+
 	*skip_count = 0;
 
 	if (0 <= it->entry_count && has_sha1_file(it->sha1))

@@ -374,7 +377,14 @@ static int update_one(struct cache_tree *it,
 #endif
 	}
 
-	if (dryrun)
+	if (repair) {
+		unsigned char sha1[20];
+		hash_sha1_file(buffer.buf, buffer.len, tree_type, sha1);
+		if (has_sha1_file(sha1))
+			hashcpy(it->sha1, sha1);
+		else
+			to_invalidate = 1;
+	} else if (dryrun)
 		hash_sha1_file(buffer.buf, buffer.len, tree_type, it->sha1);
 	else if (write_sha1_file(buffer.buf, buffer.len, tree_type, it->sha1)) {
 		strbuf_release(&buffer);

diff --git a/cache-tree.h b/cache-tree.h
index f1923ad..666d18f 100644
--- a/cache-tree.h
+++ b/cache-tree.h

@@ -39,6 +39,7 @@ int update_main_cache_tree(int);
 #define WRITE_TREE_IGNORE_CACHE_TREE 2
 #define WRITE_TREE_DRY_RUN 4
 #define WRITE_TREE_SILENT 8
+#define WRITE_TREE_REPAIR 16
 
 /* error return codes */
 #define WRITE_TREE_UNREADABLE_INDEX (-1)

diff --git a/t/t0090-cache-tree.sh b/t/t0090-cache-tree.sh
index 6c33e28..98fb1ab 100755
--- a/t/t0090-cache-tree.sh
+++ b/t/t0090-cache-tree.sh

@@ -44,14 +44,14 @@ test_expect_success 'read-tree HEAD establishes cache-tree' '
 
 test_expect_success 'git-add invalidates cache-tree' '
 	test_when_finished "git reset --hard; git read-tree HEAD" &&
-	echo "I changed this file" > foo &&
+	echo "I changed this file" >foo &&
 	git add foo &&
 	test_invalid_cache_tree
 '
 
 test_expect_success 'update-index invalidates cache-tree' '
 	test_when_finished "git reset --hard; git read-tree HEAD" &&
-	echo "I changed this file" > foo &&
+	echo "I changed this file" >foo &&
 	git update-index --add foo &&
 	test_invalid_cache_tree
 '

@@ -85,9 +85,22 @@ test_expect_success 'reset --hard without index gives cache-tree' '
 	test_shallow_cache_tree
 '
 
-test_expect_failure 'checkout gives cache-tree' '
+test_expect_success 'checkout gives cache-tree' '
+	git tag current &&
 	git checkout HEAD^ &&
 	test_shallow_cache_tree
 '
 
+test_expect_success 'checkout -b gives cache-tree' '
+	git checkout current &&
+	git checkout -b prev HEAD^ &&
+	test_shallow_cache_tree
+'
+
+test_expect_success 'checkout -B gives cache-tree' '
+	git checkout current &&
+	git checkout -B prev HEAD^ &&
+	test_shallow_cache_tree
+'
+
 test_done

-- 
2.0.0.390.gcb682f8

Re: [PATCH v8 1/4] cache-tree: Create/update cache-tree on checkou

From: David Turner <hidden>
Date: 2016-06-15 23:02:25

On Sun, 2014-08-31 at 13:07 +0100, John Keeping wrote:

On Fri, Jul 11, 2014 at 09:44:33PM -0700, David Turner wrote:

quoted

When git checkout checks out a branch, create or update the
cache-tree so that subsequent operations are faster.

update_main_cache_tree learned a new flag, WRITE_TREE_REPAIR.  When
WRITE_TREE_REPAIR is set, portions of the cache-tree which do not
correspond to existing tree objects are invalidated (and portions which
do are marked as valid).  No new tree objects are created.

Signed-off-by: David Turner <redacted>
---

This causes an incorrect error message to be printed when switching
branches with staged changes in a subdirectory.  The test case is pretty
simple:

<snip>

I tried to reproduce this problem, but I could not.  I tried to
reproduce against just this patch 1/4, and also against all 4 of the
patches.  Can you reproduce this on Junio's 'next' branch, which
includes this series of patches?

Do you have some sort of unusual configuration that might cause
different results? 

Thanks.

Re: [PATCH v8 1/4] cache-tree: Create/update cache-tree on checkou

From: John Keeping <hidden>
Date: 2016-06-15 23:02:25

On Mon, Sep 01, 2014 at 04:49:28PM -0400, David Turner wrote:

On Sun, 2014-08-31 at 13:07 +0100, John Keeping wrote:

quoted

On Fri, Jul 11, 2014 at 09:44:33PM -0700, David Turner wrote:

quoted

When git checkout checks out a branch, create or update the
cache-tree so that subsequent operations are faster.

update_main_cache_tree learned a new flag, WRITE_TREE_REPAIR.  When
WRITE_TREE_REPAIR is set, portions of the cache-tree which do not
correspond to existing tree objects are invalidated (and portions which
do are marked as valid).  No new tree objects are created.

Signed-off-by: David Turner <redacted>
---

This causes an incorrect error message to be printed when switching
branches with staged changes in a subdirectory.  The test case is pretty
simple:

<snip>

I tried to reproduce this problem, but I could not.  I tried to
reproduce against just this patch 1/4, and also against all 4 of the
patches.  Can you reproduce this on Junio's 'next' branch, which
includes this series of patches?

Do you have some sort of unusual configuration that might cause
different results?

I don't think so.  I wondered if "status.branch=true" in the config
could do it, but there's no difference turning that off.  The rest of
the config looks like this:

-- >8 --
core.excludesfile=~/.gitexcludes
push.default=upstream
color.ui=auto
[snip alias.*]
[snip user.*]
[snip url.*.insteadof]
[snip sendemail.*]
rebase.autosquash=true
mailinfo.scissors=true
format.thread=true
rerere.enabled=true
status.branch=true
pull.ff=true
credential.helper=cache
diff.tool=vimdiff
merge.tool=vimdiff
core.repositoryformatversion=0
core.filemode=true
core.bare=false
core.logallrefupdates=true
-- 8< --

The following script (run from the Git source directory) bisects down
to:

	aecf567cbfb6ab46e82f7f5df36fb6a2dd5bee69 is the first bad commit
	commit aecf567cbfb6ab46e82f7f5df36fb6a2dd5bee69
	Author: David Turner [off-list ref]
	Date:   Sat Jul 5 21:06:56 2014 -0700

	    cache-tree: create/update cache-tree on checkout

-- >8 --
#!/bin/sh
git init test &&
(
	cd test &&
	mkdir sub &&
	echo one >sub/one &&
	git add sub/one &&
	git commit -m one &&
	echo two >sub/two &&
	git add sub/two &&
	git branch other
) &&
cat >BISECT.sh <<\EOF &&
#!/bin/sh
make -j4 &&
cd test &&
../bin-wrappers/git checkout other 2>&1 | grep 'error:'
result=$?
git checkout master
if test $result = 0
then
	exit 1
else
	exit 0
fi
EOF
chmod +x BISECT.sh &&
git bisect start origin/next origin/master &&
git bisect run ./BISECT.sh

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