cache_tree_update: give an option to update cache-tree only.

When the extra "dryrun" parameter is true, cache_tree_update()
recomputes the invalid entry but does not actually creates
new tree object.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/cache-tree.c b/cache-tree.c
index 35740b3..a10902f 100644 (file)
--- a/cache-tree.c
+++ b/cache-tree.c
@@ -226,7 +226,8 @@ static int update_one(struct cache_tree *it,
                      int entries,
                      const char *base,
                      int baselen,
-                     int missing_ok)
+                     int missing_ok,
+                     int dryrun)
 {
        unsigned long size, offset;
        char *buffer;
@@ -273,7 +274,8 @@ static int update_one(struct cache_tree *it,
                                    cache + i, entries - i,
                                    path,
                                    baselen + sublen + 1,
-                                   missing_ok);
+                                   missing_ok,
+                                   dryrun);
                i += subcnt - 1;
                sub->used = 1;
        }
@@ -338,7 +340,14 @@ static int update_one(struct cache_tree *it,
 #endif
        }
 
-       write_sha1_file(buffer, offset, tree_type, it->sha1);
+       if (dryrun) {
+               char hdr[200];
+               int hdrlen;
+               write_sha1_file_prepare(buffer, offset, tree_type, it->sha1,
+                                       hdr, &hdrlen);
+       }
+       else
+               write_sha1_file(buffer, offset, tree_type, it->sha1);
        free(buffer);
        it->entry_count = i;
 #if DEBUG
@@ -352,13 +361,14 @@ static int update_one(struct cache_tree *it,
 int cache_tree_update(struct cache_tree *it,
                      struct cache_entry **cache,
                      int entries,
-                     int missing_ok)
+                     int missing_ok,
+                     int dryrun)
 {
        int i;
        i = verify_cache(cache, entries);
        if (i)
                return i;
-       i = update_one(it, cache, entries, "", 0, missing_ok);
+       i = update_one(it, cache, entries, "", 0, missing_ok, dryrun);
        if (i < 0)
                return i;
        return 0;

diff --git a/cache-tree.h b/cache-tree.h
index 5d824df..72c6480 100644 (file)
--- a/cache-tree.h
+++ b/cache-tree.h
@@ -26,6 +26,6 @@ void *cache_tree_write(struct cache_tree *root, unsigned long *size_p);
 struct cache_tree *cache_tree_read(const char *buffer, unsigned long size);
 
 int cache_tree_fully_valid(struct cache_tree *);
-int cache_tree_update(struct cache_tree *, struct cache_entry **, int, int);
+int cache_tree_update(struct cache_tree *, struct cache_entry **, int, int, int);
 
 #endif

diff --git a/write-tree.c b/write-tree.c
index a506992..7a4f691 100644 (file)
--- a/write-tree.c
+++ b/write-tree.c
@@ -41,7 +41,7 @@ int main(int argc, char **argv)
        if (!was_valid) {
                if (cache_tree_update(active_cache_tree,
                                      active_cache, active_nr,
-                                     missing_ok) < 0)
+                                     missing_ok, 0) < 0)
                        die("git-write-tree: error building trees");
                if (0 <= newfd) {
                        if (!write_cache(newfd, active_cache, active_nr))