Since the cache-tree data is saved as part of the directory data,
we already read it at the beginning of the index. The cache-tree
is only converted from this directory data.
The cache-tree data is arranged in a tree, with the children sorted by
pathlen at each node, while the ondisk format is sorted lexically.
So we have to rebuild this format from the on-disk directory list.
Signed-off-by: Thomas Gummerer <t.gummerer@xxxxxxxxx>
---
cache-tree.c | 2 +-
cache-tree.h | 1 +
read-cache-v5.c | 78 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 80 insertions(+), 1 deletion(-)
diff --git a/cache-tree.c b/cache-tree.c
index 0bbec43..1209732 100644
--- a/cache-tree.c
+++ b/cache-tree.c
@@ -31,7 +31,7 @@ void cache_tree_free(struct cache_tree **it_p)
*it_p = NULL;
}
-static int subtree_name_cmp(const char *one, int onelen,
+int subtree_name_cmp(const char *one, int onelen,
const char *two, int twolen)
{
if (onelen < twolen)
diff --git a/cache-tree.h b/cache-tree.h
index f1923ad..9818926 100644
--- a/cache-tree.h
+++ b/cache-tree.h
@@ -25,6 +25,7 @@ struct cache_tree *cache_tree(void);
void cache_tree_free(struct cache_tree **);
void cache_tree_invalidate_path(struct cache_tree *, const char *);
struct cache_tree_sub *cache_tree_sub(struct cache_tree *, const char *);
+int subtree_name_cmp(const char *, int, const char *, int);
void cache_tree_write(struct strbuf *, struct cache_tree *root);
struct cache_tree *cache_tree_read(const char *buffer, unsigned long size);
diff --git a/read-cache-v5.c b/read-cache-v5.c
index 85a2069..b14505a 100644
--- a/read-cache-v5.c
+++ b/read-cache-v5.c
@@ -471,6 +471,83 @@ static int convert_resolve_undo(struct index_state *istate,
return 0;
}
+static struct cache_tree *convert_one(struct directory_entry *de)
+{
+ int i;
+ struct cache_tree *it;
+
+ it = cache_tree();
+ it->entry_count = de->de_nentries;
+ if (0 <= it->entry_count)
+ hashcpy(it->sha1, de->sha1);
+
+ /*
+ * Just a heuristic -- we do not add directories that often but
+ * we do not want to have to extend it immediately when we do,
+ * hence +2.
+ */
+ it->subtree_alloc = de->de_nsubtrees + 2;
+ it->down = xcalloc(it->subtree_alloc, sizeof(struct cache_tree_sub *));
+ for (i = 0; i < de->de_nsubtrees; i++) {
+ struct cache_tree *sub;
+ struct cache_tree_sub *subtree;
+ char *buf, *name;
+
+ sub = convert_one(de->sub[i]);
+ if(!sub)
+ goto free_return;
+
+ name = "";
+ buf = strtok(de->sub[i]->pathname, "/");
+ while (buf) {
+ name = buf;
+ buf = strtok(NULL, "/");
+ }
+ subtree = cache_tree_sub(it, name);
+ subtree->cache_tree = sub;
+ }
+ if (de->de_nsubtrees != it->subtree_nr)
+ die("cache-tree: internal error");
+ return it;
+ free_return:
+ cache_tree_free(&it);
+ return NULL;
+}
+
+static int compare_cache_tree_elements(const void *a, const void *b)
+{
+ const struct directory_entry *de1, *de2;
+
+ de1 = (const struct directory_entry *) a;
+ de2 = (const struct directory_entry *) b;
+ return subtree_name_cmp(de1->pathname, de1->de_pathlen,
+ de2->pathname, de2->de_pathlen);
+}
+
+static void sort_directories(struct directory_entry *de)
+{
+ int i;
+
+ for (i = 0; i < de->de_nsubtrees; i++) {
+ if (de->sub[i]->de_nsubtrees)
+ sort_directories(de->sub[i]);
+ }
+ qsort(de->sub, de->de_nsubtrees, sizeof(struct directory_entry *),
+ compare_cache_tree_elements);
+}
+
+/*
+ * This function modifies the directory argument that is given to it.
+ * Don't use it if the directory entries are still needed after.
+ */
+static struct cache_tree *cache_tree_convert_v5(struct directory_entry *de)
+{
+ if (!de->de_nentries)
+ return NULL;
+ sort_directories(de);
+ return convert_one(de);
+}
+
static int read_entries(struct index_state *istate, struct directory_entry *de,
unsigned int first_entry_offset, void *mmap,
unsigned long mmap_size, unsigned int *nr,
@@ -591,6 +668,7 @@ static int read_index_v5(struct index_state *istate, void *mmap,
}
de = de->next;
}
+ istate->cache_tree = cache_tree_convert_v5(root_directory);
istate->cache_nr = nr;
return 0;
}
--
1.8.3.4.1231.g9fbf354.dirty
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