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                 struct blob *blob;
  59
  60                 /*
  61                  * The index can contain blobs and GITLINKs, GITLINKs are hashes
  62                  * that don't actually point to objects in the repository, it's
  63                  * almost guaranteed that they are NOT blobs, so we don't call
  64                  * lookup_blob() on them, to avoid populating the hash table
  65                  * with invalid information
  66                  */
  67                 if (S_ISGITLINK(active_cache[i]->ce_mode))
  68                         continue;
  69
  70                 blob = lookup_blob(active_cache[i]->sha1);
  71                 if (blob)
  72                         blob->object.flags |= SEEN;
  73
  74                 /*
  75                  * We could add the blobs to the pending list, but quite
  76                  * frankly, we don't care. Once we've looked them up, and
  77                  * added them as objects, we've really done everything
  78                  * there is to do for a blob
  79                  */
  80         }
  81         if (active_cache_tree)
  82                 add_cache_tree(active_cache_tree, revs);
  83 }
  84
  85 /*
  86  * The traversal will have already marked us as SEEN, so we
  87  * only need to handle any progress reporting here.
  88  */
  89 static void mark_object(struct object *obj, const struct name_path *path,
  90                         const char *name, void *data)
  91 {
  92         update_progress(data);
  93 }
  94
  95 static void mark_commit(struct commit *c, void *data)
  96 {
  97         mark_object(&c->object, NULL, NULL, data);
  98 }
  99
 100 void mark_reachable_objects(struct rev_info *revs, int mark_reflog,
 101                             struct progress *progress)
 102 {
 103         struct connectivity_progress cp;
 104
 105         /*
 106          * Set up revision parsing, and mark us as being interested
 107          * in all object types, not just commits.
 108          */
 109         revs->tag_objects = 1;
 110         revs->blob_objects = 1;
 111         revs->tree_objects = 1;
 112
 113         /* Add all refs from the index file */
 114         add_cache_refs(revs);
 115
 116         /* Add all external refs */
 117         for_each_ref(add_one_ref, revs);
 118
 119         /* detached HEAD is not included in the list above */
 120         head_ref(add_one_ref, revs);
 121
 122         /* Add all reflog info */
 123         if (mark_reflog)
 124                 add_reflogs_to_pending(revs, 0);
 125
 126         cp.progress = progress;
 127         cp.count = 0;
 128
 129         /*
 130          * Set up the revision walk - this will move all commits
 131          * from the pending list to the commit walking list.
 132          */
 133         if (prepare_revision_walk(revs))
 134                 die("revision walk setup failed");
 135         traverse_commit_list(revs, mark_commit, mark_object, &cp);
 136         display_progress(cp.progress, cp.count);
 137 }