reachable.c

   1 #include "cache.h"
   2 #include "refs.h"
   3 #include "tag.h"
   4 #include "commit.h"
   5 #include "blob.h"
   6 #include "diff.h"
   7 #include "revision.h"
   8 #include "reachable.h"
   9 #include "cache-tree.h"
  10 #include "progress.h"
  11
  12 struct connectivity_progress {
  13         struct progress *progress;
  14         unsigned long count;
  15 };
  16
  17 static void update_progress(struct connectivity_progress *cp)
  18 {
  19         cp->count++;
  20         if ((cp->count & 1023) == 0)
  21                 display_progress(cp->progress, cp->count);
  22 }
  23
  24 static void process_blob(struct blob *blob,
  25                          struct object_array *p,
  26                          struct name_path *path,
  27                          const char *name,
  28                          struct connectivity_progress *cp)
  29 {
  30         struct object *obj = &blob->object;
  31
  32         if (!blob)
  33                 die("bad blob object");
  34         if (obj->flags & SEEN)
  35                 return;
  36         obj->flags |= SEEN;
  37         update_progress(cp);
  38         /* Nothing to do, really .. The blob lookup was the important part */
  39 }
  40
  41 static void process_gitlink(const unsigned char *sha1,
  42                             struct object_array *p,
  43                             struct name_path *path,
  44                             const char *name)
  45 {
  46         /* I don't think we want to recurse into this, really. */
  47 }
  48
  49 static void process_tree(struct tree *tree,
  50                          struct object_array *p,
  51                          struct name_path *path,
  52                          const char *name,
  53                          struct connectivity_progress *cp)
  54 {
  55         struct object *obj = &tree->object;
  56         struct tree_desc desc;
  57         struct name_entry entry;
  58         struct name_path me;
  59
  60         if (!tree)
  61                 die("bad tree object");
  62         if (obj->flags & SEEN)
  63                 return;
  64         obj->flags |= SEEN;
  65         update_progress(cp);
  66         if (parse_tree(tree) < 0)
  67                 die("bad tree object %s", sha1_to_hex(obj->sha1));
  68         add_object(obj, p, path, name);
  69         me.up = path;
  70         me.elem = name;
  71         me.elem_len = strlen(name);
  72
  73         init_tree_desc(&desc, tree->buffer, tree->size);
  74
  75         while (tree_entry(&desc, &entry)) {
  76                 if (S_ISDIR(entry.mode))
  77                         process_tree(lookup_tree(entry.sha1), p, &me, entry.path, cp);
  78                 else if (S_ISGITLINK(entry.mode))
  79                         process_gitlink(entry.sha1, p, &me, entry.path);
  80                 else
  81                         process_blob(lookup_blob(entry.sha1), p, &me, entry.path, cp);
  82         }
  83         free_tree_buffer(tree);
  84 }
  85
  86 static void process_tag(struct tag *tag, struct object_array *p,
  87                         const char *name, struct connectivity_progress *cp)
  88 {
  89         struct object *obj = &tag->object;
  90
  91         if (obj->flags & SEEN)
  92                 return;
  93         obj->flags |= SEEN;
  94         update_progress(cp);
  95
  96         if (parse_tag(tag) < 0)
  97                 die("bad tag object %s", sha1_to_hex(obj->sha1));
  98         if (tag->tagged)
  99                 add_object(tag->tagged, p, NULL, name);
 100 }
 101
 102 static void walk_commit_list(struct rev_info *revs,
 103                              struct connectivity_progress *cp)
 104 {
 105         int i;
 106         struct commit *commit;
 107         struct object_array objects = OBJECT_ARRAY_INIT;
 108
 109         /* Walk all commits, process their trees */
 110         while ((commit = get_revision(revs)) != NULL) {
 111                 process_tree(commit->tree, &objects, NULL, "", cp);
 112                 update_progress(cp);
 113         }
 114
 115         /* Then walk all the pending objects, recursively processing them too */
 116         for (i = 0; i < revs->pending.nr; i++) {
 117                 struct object_array_entry *pending = revs->pending.objects + i;
 118                 struct object *obj = pending->item;
 119                 const char *name = pending->name;
 120                 if (obj->type == OBJ_TAG) {
 121                         process_tag((struct tag *) obj, &objects, name, cp);
 122                         continue;
 123                 }
 124                 if (obj->type == OBJ_TREE) {
 125                         process_tree((struct tree *)obj, &objects, NULL, name, cp);
 126                         continue;
 127                 }
 128                 if (obj->type == OBJ_BLOB) {
 129                         process_blob((struct blob *)obj, &objects, NULL, name, cp);
 130                         continue;
 131                 }
 132                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
 133         }
 134 }
 135
 136 static int add_one_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
 137                 const char *email, unsigned long timestamp, int tz,
 138                 const char *message, void *cb_data)
 139 {
 140         struct object *object;
 141         struct rev_info *revs = (struct rev_info *)cb_data;
 142
 143         object = parse_object(osha1);
 144         if (object)
 145                 add_pending_object(revs, object, "");
 146         object = parse_object(nsha1);
 147         if (object)
 148                 add_pending_object(revs, object, "");
 149         return 0;
 150 }
 151
 152 static int add_one_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
 153 {
 154         struct object *object = parse_object_or_die(sha1, path);
 155         struct rev_info *revs = (struct rev_info *)cb_data;
 156
 157         add_pending_object(revs, object, "");
 158
 159         return 0;
 160 }
 161
 162 static int add_one_reflog(const char *path, const unsigned char *sha1, int flag, void *cb_data)
 163 {
 164         for_each_reflog_ent(path, add_one_reflog_ent, cb_data);
 165         return 0;
 166 }
 167
 168 static void add_one_tree(const unsigned char *sha1, struct rev_info *revs)
 169 {
 170         struct tree *tree = lookup_tree(sha1);
 171         if (tree)
 172                 add_pending_object(revs, &tree->object, "");
 173 }
 174
 175 static void add_cache_tree(struct cache_tree *it, struct rev_info *revs)
 176 {
 177         int i;
 178
 179         if (it->entry_count >= 0)
 180                 add_one_tree(it->sha1, revs);
 181         for (i = 0; i < it->subtree_nr; i++)
 182                 add_cache_tree(it->down[i]->cache_tree, revs);
 183 }
 184
 185 static void add_cache_refs(struct rev_info *revs)
 186 {
 187         int i;
 188
 189         read_cache();
 190         for (i = 0; i < active_nr; i++) {
 191                 /*
 192                  * The index can contain blobs and GITLINKs, GITLINKs are hashes
 193                  * that don't actually point to objects in the repository, it's
 194                  * almost guaranteed that they are NOT blobs, so we don't call
 195                  * lookup_blob() on them, to avoid populating the hash table
 196                  * with invalid information
 197                  */
 198                 if (S_ISGITLINK(active_cache[i]->ce_mode))
 199                         continue;
 200
 201                 lookup_blob(active_cache[i]->sha1);
 202                 /*
 203                  * We could add the blobs to the pending list, but quite
 204                  * frankly, we don't care. Once we've looked them up, and
 205                  * added them as objects, we've really done everything
 206                  * there is to do for a blob
 207                  */
 208         }
 209         if (active_cache_tree)
 210                 add_cache_tree(active_cache_tree, revs);
 211 }
 212
 213 void mark_reachable_objects(struct rev_info *revs, int mark_reflog,
 214                             struct progress *progress)
 215 {
 216         struct connectivity_progress cp;
 217
 218         /*
 219          * Set up revision parsing, and mark us as being interested
 220          * in all object types, not just commits.
 221          */
 222         revs->tag_objects = 1;
 223         revs->blob_objects = 1;
 224         revs->tree_objects = 1;
 225
 226         /* Add all refs from the index file */
 227         add_cache_refs(revs);
 228
 229         /* Add all external refs */
 230         for_each_ref(add_one_ref, revs);
 231
 232         /* detached HEAD is not included in the list above */
 233         head_ref(add_one_ref, revs);
 234
 235         /* Add all reflog info */
 236         if (mark_reflog)
 237                 for_each_reflog(add_one_reflog, revs);
 238
 239         cp.progress = progress;
 240         cp.count = 0;
 241
 242         /*
 243          * Set up the revision walk - this will move all commits
 244          * from the pending list to the commit walking list.
 245          */
 246         if (prepare_revision_walk(revs))
 247                 die("revision walk setup failed");
 248         walk_commit_list(revs, &cp);
 249         display_progress(cp.progress, cp.count);
 250 }