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