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 #include "list-objects.h"
  12
  13 struct connectivity_progress {
  14         struct progress *progress;
  15         unsigned long count;
  16 };
  17
  18 static void update_progress(struct connectivity_progress *cp)
  19 {
  20         cp->count++;
  21         if ((cp->count & 1023) == 0)
  22                 display_progress(cp->progress, cp->count);
  23 }
  24
  25 static int add_one_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
  26 {
  27         struct object *object = parse_object_or_die(sha1, path);
  28         struct rev_info *revs = (struct rev_info *)cb_data;
  29
  30         add_pending_object(revs, object, "");
  31
  32         return 0;
  33 }
  34
  35 static void add_one_tree(const unsigned char *sha1, struct rev_info *revs)
  36 {
  37         struct tree *tree = lookup_tree(sha1);
  38         if (tree)
  39                 add_pending_object(revs, &tree->object, "");
  40 }
  41
  42 static void add_cache_tree(struct cache_tree *it, struct rev_info *revs)
  43 {
  44         int i;
  45
  46         if (it->entry_count >= 0)
  47                 add_one_tree(it->sha1, revs);
  48         for (i = 0; i < it->subtree_nr; i++)
  49                 add_cache_tree(it->down[i]->cache_tree, revs);
  50 }
  51
  52 static void add_cache_refs(struct rev_info *revs)
  53 {
  54         int i;
  55
  56         read_cache();
  57         for (i = 0; i < active_nr; i++) {
  58                 /*
  59                  * The index can contain blobs and GITLINKs, GITLINKs are hashes
  60                  * that don't actually point to objects in the repository, it's
  61                  * almost guaranteed that they are NOT blobs, so we don't call
  62                  * lookup_blob() on them, to avoid populating the hash table
  63                  * with invalid information
  64                  */
  65                 if (S_ISGITLINK(active_cache[i]->ce_mode))
  66                         continue;
  67
  68                 lookup_blob(active_cache[i]->sha1);
  69                 /*
  70                  * We could add the blobs to the pending list, but quite
  71                  * frankly, we don't care. Once we've looked them up, and
  72                  * added them as objects, we've really done everything
  73                  * there is to do for a blob
  74                  */
  75         }
  76         if (active_cache_tree)
  77                 add_cache_tree(active_cache_tree, revs);
  78 }
  79
  80 /*
  81  * The traversal will have already marked us as SEEN, so we
  82  * only need to handle any progress reporting here.
  83  */
  84 static void mark_object(struct object *obj, const struct name_path *path,
  85                         const char *name, void *data)
  86 {
  87         update_progress(data);
  88 }
  89
  90 static void mark_commit(struct commit *c, void *data)
  91 {
  92         mark_object(&c->object, NULL, NULL, data);
  93 }
  94
  95 void mark_reachable_objects(struct rev_info *revs, int mark_reflog,
  96                             struct progress *progress)
  97 {
  98         struct connectivity_progress cp;
  99
 100         /*
 101          * Set up revision parsing, and mark us as being interested
 102          * in all object types, not just commits.
 103          */
 104         revs->tag_objects = 1;
 105         revs->blob_objects = 1;
 106         revs->tree_objects = 1;
 107
 108         /* Add all refs from the index file */
 109         add_cache_refs(revs);
 110
 111         /* Add all external refs */
 112         for_each_ref(add_one_ref, revs);
 113
 114         /* detached HEAD is not included in the list above */
 115         head_ref(add_one_ref, revs);
 116
 117         /* Add all reflog info */
 118         if (mark_reflog)
 119                 add_reflogs_to_pending(revs, 0);
 120
 121         cp.progress = progress;
 122         cp.count = 0;
 123
 124         /*
 125          * Set up the revision walk - this will move all commits
 126          * from the pending list to the commit walking list.
 127          */
 128         if (prepare_revision_walk(revs))
 129                 die("revision walk setup failed");
 130         traverse_commit_list(revs, mark_commit, mark_object, &cp);
 131         display_progress(cp.progress, cp.count);
 132 }