[PATCH] delta check

[git.git] / fsck-cache.c

diff --git a/fsck-cache.c b/fsck-cache.c
index c4b1c1a..6ac122b 100644 (file)
--- a/fsck-cache.c
+++ b/fsck-cache.c
@@ -6,15 +6,46 @@
 #include "tree.h"
 #include "blob.h"
 #include "tag.h"
+#include "delta.h"
 
 #define REACHABLE 0x0001
 
 static int show_root = 0;
 static int show_tags = 0;
 static int show_unreachable = 0;
+static int show_max_delta_depth = 0;
 static int keep_cache_objects = 0; 
 static unsigned char head_sha1[20];
 
+static void expand_deltas(void)
+{
+       int i, max_depth = 0;
+
+       /*
+        * To be as efficient as possible we look for delta heads and
+        * recursively process them going backward, and parsing
+        * resulting objects along the way.  This allows for processing
+        * each delta objects only once regardless of the delta depth.
+        */
+       for (i = 0; i < nr_objs; i++) {
+               struct object *obj = objs[i];
+               if (obj->parsed && !obj->delta && obj->attached_deltas) {
+                       int depth = 0;
+                       char type[10];
+                       unsigned long size;
+                       void *buf = read_sha1_file(obj->sha1, type, &size);
+                       if (!buf)
+                               continue;
+                       depth = process_deltas(buf, size, obj->type,
+                                              obj->attached_deltas);
+                       if (max_depth < depth)
+                               max_depth = depth;
+               }
+       }
+       if (show_max_delta_depth)
+               printf("maximum delta depth = %d\n", max_depth);
+}
+                                                                                                                       
 static void check_connectivity(void)
 {
        int i;
@@ -25,7 +56,12 @@ static void check_connectivity(void)
                struct object_list *refs;
 
                if (!obj->parsed) {
-                       printf("missing %s %s\n", obj->type, sha1_to_hex(obj->sha1));
+                       if (obj->delta)
+                               printf("unresolved delta %s\n",
+                                      sha1_to_hex(obj->sha1));
+                       else
+                               printf("missing %s %s\n",
+                                      obj->type, sha1_to_hex(obj->sha1));
                        continue;
                }
 
@@ -43,7 +79,12 @@ static void check_connectivity(void)
                        continue;
 
                if (show_unreachable && !(obj->flags & REACHABLE)) {
-                       printf("unreachable %s %s\n", obj->type, sha1_to_hex(obj->sha1));
+                       if (obj->attached_deltas)
+                               printf("foreign delta reference %s\n", 
+                                      sha1_to_hex(obj->sha1));
+                       else
+                               printf("unreachable %s %s\n",
+                                      obj->type, sha1_to_hex(obj->sha1));
                        continue;
                }
 
@@ -152,7 +193,7 @@ static int fsck_tree(struct tree *item)
        }
 
        if (has_full_path) {
-               fprintf(stderr, "warning: fsck-cache: tree %s "
+               fprintf(stderr, "warning: git-fsck-cache: tree %s "
                        "has full pathnames in it\n", 
                        sha1_to_hex(item->object.sha1));
        }
@@ -201,6 +242,8 @@ static int fsck_sha1(unsigned char *sha1)
                return fsck_commit((struct commit *) obj);
        if (obj->type == tag_type)
                return fsck_tag((struct tag *) obj);
+       if (!obj->type && obj->delta)
+               return 0;
        return -1;
 }
 
@@ -296,7 +339,7 @@ static int fsck_dir(int i, char *path)
        return 0;
 }
 
-static void read_sha1_reference(const char *path)
+static int read_sha1_reference(const char *path)
 {
        char hexname[60];
        unsigned char sha1[20];
@@ -304,19 +347,23 @@ static void read_sha1_reference(const char *path)
        struct object *obj;
 
        if (fd < 0)
-               return;
+               return -1;
 
        len = read(fd, hexname, sizeof(hexname));
        close(fd);
        if (len < 40)
-               return;
+               return -1;
 
        if (get_sha1_hex(hexname, sha1) < 0)
-               return;
+               return -1;
 
        obj = lookup_object(sha1);
+       if (!obj)
+               return error("%s: invalid sha1 pointer %.40s", path, hexname);
+
        obj->used = 1;
        mark_reachable(obj, REACHABLE);
+       return 0;
 }
 
 static void find_file_objects(const char *base, const char *name)
@@ -380,12 +427,16 @@ int main(int argc, char **argv)
                        show_root = 1;
                        continue;
                }
+               if (!strcmp(arg, "--delta-depth")) {
+                       show_max_delta_depth = 1;
+                       continue;
+               }
                if (!strcmp(arg, "--cache")) {
                        keep_cache_objects = 1;
                        continue;
                }
                if (*arg == '-')
-                       usage("fsck-cache [--tags] [[--unreachable] [--cache] <head-sha1>*]");
+                       usage("git-fsck-cache [--tags] [[--unreachable] [--cache] <head-sha1>*]");
        }
 
        sha1_dir = get_object_directory();
@@ -396,6 +447,8 @@ int main(int argc, char **argv)
        }
        fsck_sha1_list();
 
+       expand_deltas();
+
        heads = 0;
        for (i = 1; i < argc; i++) {
                const char *arg = argv[i]; 
@@ -419,7 +472,7 @@ int main(int argc, char **argv)
        }
 
        /*
-        * If we've not been gived any explicit head information, do the
+        * If we've not been given any explicit head information, do the
         * default ones from .git/refs. We also consider the index file
         * in this case (ie this implies --cache).
         */