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 struct object_id *oid,
  26                        int flag, void *cb_data)
  27 {
  28         struct object *object = parse_object_or_die(oid->hash, path);
  29         struct rev_info *revs = (struct rev_info *)cb_data;
  30
  31         add_pending_object(revs, object, "");
  32
  33         return 0;
  34 }
  35
  36 /*
  37  * The traversal will have already marked us as SEEN, so we
  38  * only need to handle any progress reporting here.
  39  */
  40 static void mark_object(struct object *obj, const struct name_path *path,
  41                         const char *name, void *data)
  42 {
  43         update_progress(data);
  44 }
  45
  46 static void mark_commit(struct commit *c, void *data)
  47 {
  48         mark_object(&c->object, NULL, NULL, data);
  49 }
  50
  51 struct recent_data {
  52         struct rev_info *revs;
  53         unsigned long timestamp;
  54 };
  55
  56 static void add_recent_object(const unsigned char *sha1,
  57                               unsigned long mtime,
  58                               struct recent_data *data)
  59 {
  60         struct object *obj;
  61         enum object_type type;
  62
  63         if (mtime <= data->timestamp)
  64                 return;
  65
  66         /*
  67          * We do not want to call parse_object here, because
  68          * inflating blobs and trees could be very expensive.
  69          * However, we do need to know the correct type for
  70          * later processing, and the revision machinery expects
  71          * commits and tags to have been parsed.
  72          */
  73         type = sha1_object_info(sha1, NULL);
  74         if (type < 0)
  75                 die("unable to get object info for %s", sha1_to_hex(sha1));
  76
  77         switch (type) {
  78         case OBJ_TAG:
  79         case OBJ_COMMIT:
  80                 obj = parse_object_or_die(sha1, NULL);
  81                 break;
  82         case OBJ_TREE:
  83                 obj = (struct object *)lookup_tree(sha1);
  84                 break;
  85         case OBJ_BLOB:
  86                 obj = (struct object *)lookup_blob(sha1);
  87                 break;
  88         default:
  89                 die("unknown object type for %s: %s",
  90                     sha1_to_hex(sha1), typename(type));
  91         }
  92
  93         if (!obj)
  94                 die("unable to lookup %s", sha1_to_hex(sha1));
  95
  96         add_pending_object(data->revs, obj, "");
  97 }
  98
  99 static int add_recent_loose(const unsigned char *sha1,
 100                             const char *path, void *data)
 101 {
 102         struct stat st;
 103         struct object *obj = lookup_object(sha1);
 104
 105         if (obj && obj->flags & SEEN)
 106                 return 0;
 107
 108         if (stat(path, &st) < 0) {
 109                 /*
 110                  * It's OK if an object went away during our iteration; this
 111                  * could be due to a simultaneous repack. But anything else
 112                  * we should abort, since we might then fail to mark objects
 113                  * which should not be pruned.
 114                  */
 115                 if (errno == ENOENT)
 116                         return 0;
 117                 return error("unable to stat %s: %s",
 118                              sha1_to_hex(sha1), strerror(errno));
 119         }
 120
 121         add_recent_object(sha1, st.st_mtime, data);
 122         return 0;
 123 }
 124
 125 static int add_recent_packed(const unsigned char *sha1,
 126                              struct packed_git *p, uint32_t pos,
 127                              void *data)
 128 {
 129         struct object *obj = lookup_object(sha1);
 130
 131         if (obj && obj->flags & SEEN)
 132                 return 0;
 133         add_recent_object(sha1, p->mtime, data);
 134         return 0;
 135 }
 136
 137 int add_unseen_recent_objects_to_traversal(struct rev_info *revs,
 138                                            unsigned long timestamp)
 139 {
 140         struct recent_data data;
 141         int r;
 142
 143         data.revs = revs;
 144         data.timestamp = timestamp;
 145
 146         r = for_each_loose_object(add_recent_loose, &data,
 147                                   FOR_EACH_OBJECT_LOCAL_ONLY);
 148         if (r)
 149                 return r;
 150         return for_each_packed_object(add_recent_packed, &data,
 151                                       FOR_EACH_OBJECT_LOCAL_ONLY);
 152 }
 153
 154 void mark_reachable_objects(struct rev_info *revs, int mark_reflog,
 155                             unsigned long mark_recent,
 156                             struct progress *progress)
 157 {
 158         struct connectivity_progress cp;
 159
 160         /*
 161          * Set up revision parsing, and mark us as being interested
 162          * in all object types, not just commits.
 163          */
 164         revs->tag_objects = 1;
 165         revs->blob_objects = 1;
 166         revs->tree_objects = 1;
 167
 168         /* Add all refs from the index file */
 169         add_index_objects_to_pending(revs, 0);
 170
 171         /* Add all external refs */
 172         for_each_ref(add_one_ref, revs);
 173
 174         /* detached HEAD is not included in the list above */
 175         head_ref(add_one_ref, revs);
 176
 177         /* Add all reflog info */
 178         if (mark_reflog)
 179                 add_reflogs_to_pending(revs, 0);
 180
 181         cp.progress = progress;
 182         cp.count = 0;
 183
 184         /*
 185          * Set up the revision walk - this will move all commits
 186          * from the pending list to the commit walking list.
 187          */
 188         if (prepare_revision_walk(revs))
 189                 die("revision walk setup failed");
 190         traverse_commit_list(revs, mark_commit, mark_object, &cp);
 191
 192         if (mark_recent) {
 193                 revs->ignore_missing_links = 1;
 194                 if (add_unseen_recent_objects_to_traversal(revs, mark_recent))
 195                         die("unable to mark recent objects");
 196                 if (prepare_revision_walk(revs))
 197                         die("revision walk setup failed");
 198                 traverse_commit_list(revs, mark_commit, mark_object, &cp);
 199         }
 200
 201         display_progress(cp.progress, cp.count);
 202 }