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_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
  26                 const char *email, unsigned long timestamp, int tz,
  27                 const char *message, void *cb_data)
  28 {
  29         struct object *object;
  30         struct rev_info *revs = (struct rev_info *)cb_data;
  31
  32         object = parse_object(osha1);
  33         if (object)
  34                 add_pending_object(revs, object, "");
  35         object = parse_object(nsha1);
  36         if (object)
  37                 add_pending_object(revs, object, "");
  38         return 0;
  39 }
  40
  41 static int add_one_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
  42 {
  43         struct object *object = parse_object_or_die(sha1, path);
  44         struct rev_info *revs = (struct rev_info *)cb_data;
  45
  46         add_pending_object(revs, object, "");
  47
  48         return 0;
  49 }
  50
  51 static int add_one_reflog(const char *path, const unsigned char *sha1, int flag, void *cb_data)
  52 {
  53         for_each_reflog_ent(path, add_one_reflog_ent, cb_data);
  54         return 0;
  55 }
  56
  57 static void add_one_tree(const unsigned char *sha1, struct rev_info *revs)
  58 {
  59         struct tree *tree = lookup_tree(sha1);
  60         if (tree)
  61                 add_pending_object(revs, &tree->object, "");
  62 }
  63
  64 static void add_cache_tree(struct cache_tree *it, struct rev_info *revs)
  65 {
  66         int i;
  67
  68         if (it->entry_count >= 0)
  69                 add_one_tree(it->sha1, revs);
  70         for (i = 0; i < it->subtree_nr; i++)
  71                 add_cache_tree(it->down[i]->cache_tree, revs);
  72 }
  73
  74 static void add_cache_refs(struct rev_info *revs)
  75 {
  76         int i;
  77
  78         read_cache();
  79         for (i = 0; i < active_nr; i++) {
  80                 /*
  81                  * The index can contain blobs and GITLINKs, GITLINKs are hashes
  82                  * that don't actually point to objects in the repository, it's
  83                  * almost guaranteed that they are NOT blobs, so we don't call
  84                  * lookup_blob() on them, to avoid populating the hash table
  85                  * with invalid information
  86                  */
  87                 if (S_ISGITLINK(active_cache[i]->ce_mode))
  88                         continue;
  89
  90                 lookup_blob(active_cache[i]->sha1);
  91                 /*
  92                  * We could add the blobs to the pending list, but quite
  93                  * frankly, we don't care. Once we've looked them up, and
  94                  * added them as objects, we've really done everything
  95                  * there is to do for a blob
  96                  */
  97         }
  98         if (active_cache_tree)
  99                 add_cache_tree(active_cache_tree, revs);
 100 }
 101
 102 /*
 103  * The traversal will have already marked us as SEEN, so we
 104  * only need to handle any progress reporting here.
 105  */
 106 static void mark_object(struct object *obj, const struct name_path *path,
 107                         const char *name, void *data)
 108 {
 109         update_progress(data);
 110 }
 111
 112 static void mark_commit(struct commit *c, void *data)
 113 {
 114         mark_object(&c->object, NULL, NULL, data);
 115 }
 116
 117 void mark_reachable_objects(struct rev_info *revs, int mark_reflog,
 118                             struct progress *progress)
 119 {
 120         struct connectivity_progress cp;
 121
 122         /*
 123          * Set up revision parsing, and mark us as being interested
 124          * in all object types, not just commits.
 125          */
 126         revs->tag_objects = 1;
 127         revs->blob_objects = 1;
 128         revs->tree_objects = 1;
 129
 130         /* Add all refs from the index file */
 131         add_cache_refs(revs);
 132
 133         /* Add all external refs */
 134         for_each_ref(add_one_ref, revs);
 135
 136         /* detached HEAD is not included in the list above */
 137         head_ref(add_one_ref, revs);
 138
 139         /* Add all reflog info */
 140         if (mark_reflog)
 141                 for_each_reflog(add_one_reflog, revs);
 142
 143         cp.progress = progress;
 144         cp.count = 0;
 145
 146         /*
 147          * Set up the revision walk - this will move all commits
 148          * from the pending list to the commit walking list.
 149          */
 150         if (prepare_revision_walk(revs))
 151                 die("revision walk setup failed");
 152         traverse_commit_list(revs, mark_commit, mark_object, &cp);
 153         display_progress(cp.progress, cp.count);
 154 }