unpack-object: cache for non written objects

Preventing objects with broken links entering the repository
means, that write of some objects must be delayed.

This patch adds a cache to keep the object data in memory. The delta
resolving code must also search in the cache.

Signed-off-by: Martin Koegler <mkoegler@auto.tuwien.ac.at>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin-unpack-objects.c b/builtin-unpack-objects.c
index 1e51865c52231e80cfdbbb19c8b6fa86ee8855d2..50e07faa12f495b3270e1446573b88a255336877 100644 (file)
--- a/builtin-unpack-objects.c
+++ b/builtin-unpack-objects.c
@@ -8,6 +8,7 @@
 #include "tag.h"
 #include "tree.h"
 #include "progress.h"
+#include "decorate.h"
 
 static int dry_run, quiet, recover, has_errors;
 static const char unpack_usage[] = "git-unpack-objects [-n] [-q] [-r] < pack-file";
@@ -18,6 +19,18 @@ static unsigned int offset, len;
 static off_t consumed_bytes;
 static SHA_CTX ctx;
 
+struct obj_buffer {
+       char *buffer;
+       unsigned long size;
+};
+
+static struct decoration obj_decorate;
+
+static struct obj_buffer *lookup_object_buffer(struct object *base)
+{
+       return lookup_decoration(&obj_decorate, base);
+}
+
 /*
  * Make sure at least "min" bytes are available in the buffer, and
  * return the pointer to the buffer.
@@ -189,6 +202,7 @@ static void unpack_delta_entry(enum object_type type, unsigned long delta_size,
        void *delta_data, *base;
        unsigned long base_size;
        unsigned char base_sha1[20];
+       struct object *obj;
 
        if (type == OBJ_REF_DELTA) {
                hashcpy(base_sha1, fill(20));
@@ -252,6 +266,15 @@ static void unpack_delta_entry(enum object_type type, unsigned long delta_size,
                }
        }
 
+       obj = lookup_object(base_sha1);
+       if (obj) {
+               struct obj_buffer *obj_buf = lookup_object_buffer(obj);
+               if (obj_buf) {
+                       resolve_delta(nr, obj->type, obj_buf->buffer, obj_buf->size, delta_data, delta_size);
+                       return;
+               }
+       }
+
        base = read_sha1_file(base_sha1, &type, &base_size);
        if (!base) {
                error("failed to read delta-pack base object %s",