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

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 <dturner@twitter.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
David Turner 2014-07-05 21:06:56 -07:00 committed by Junio C Hamano
parent c2f7b1026e
commit aecf567cbf
4 changed files with 36 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
builtin/checkout.c
View File

@ -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"));

12
cache-tree.c
View File

@ -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);

1
cache-tree.h
View File

@ -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)

19
t/t0090-cache-tree.sh
View File

@ -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