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 rev_info *revs = (struct rev_info *)cb_data;
  29         struct object *object;
  30
  31         if ((flag & REF_ISSYMREF) && (flag & REF_ISBROKEN)) {
  32                 warning("symbolic ref is dangling: %s", path);
  33                 return 0;
  34         }
  35
  36         object = parse_object_or_die(oid->hash, path);
  37         add_pending_object(revs, object, "");
  38
  39         return 0;
  40 }
  41
  42 /*
  43  * The traversal will have already marked us as SEEN, so we
  44  * only need to handle any progress reporting here.
  45  */
  46 static void mark_object(struct object *obj, const struct name_path *path,
  47                         const char *name, void *data)
  48 {
  49         update_progress(data);
  50 }
  51
  52 static void mark_commit(struct commit *c, void *data)
  53 {
  54         mark_object(&c->object, NULL, NULL, data);
  55 }
  56
  57 struct recent_data {
  58         struct rev_info *revs;
  59         unsigned long timestamp;
  60 };
  61
  62 static void add_recent_object(const unsigned char *sha1,
  63                               unsigned long mtime,
  64                               struct recent_data *data)
  65 {
  66         struct object *obj;
  67         enum object_type type;
  68
  69         if (mtime <= data->timestamp)
  70                 return;
  71
  72         /*
  73          * We do not want to call parse_object here, because
  74          * inflating blobs and trees could be very expensive.
  75          * However, we do need to know the correct type for
  76          * later processing, and the revision machinery expects
  77          * commits and tags to have been parsed.
  78          */
  79         type = sha1_object_info(sha1, NULL);
  80         if (type < 0)
  81                 die("unable to get object info for %s", sha1_to_hex(sha1));
  82
  83         switch (type) {
  84         case OBJ_TAG:
  85         case OBJ_COMMIT:
  86                 obj = parse_object_or_die(sha1, NULL);
  87                 break;
  88         case OBJ_TREE:
  89                 obj = (struct object *)lookup_tree(sha1);
  90                 break;
  91         case OBJ_BLOB:
  92                 obj = (struct object *)lookup_blob(sha1);
  93                 break;
  94         default:
  95                 die("unknown object type for %s: %s",
  96                     sha1_to_hex(sha1), typename(type));
  97         }
  98
  99         if (!obj)
 100                 die("unable to lookup %s", sha1_to_hex(sha1));
 101
 102         add_pending_object(data->revs, obj, "");
 103 }
 104
 105 static int add_recent_loose(const unsigned char *sha1,
 106                             const char *path, void *data)
 107 {
 108         struct stat st;
 109         struct object *obj = lookup_object(sha1);
 110
 111         if (obj && obj->flags & SEEN)
 112                 return 0;
 113
 114         if (stat(path, &st) < 0) {
 115                 /*
 116                  * It's OK if an object went away during our iteration; this
 117                  * could be due to a simultaneous repack. But anything else
 118                  * we should abort, since we might then fail to mark objects
 119                  * which should not be pruned.
 120                  */
 121                 if (errno == ENOENT)
 122                         return 0;
 123                 return error("unable to stat %s: %s",
 124                              sha1_to_hex(sha1), strerror(errno));
 125         }
 126
 127         add_recent_object(sha1, st.st_mtime, data);
 128         return 0;
 129 }
 130
 131 static int add_recent_packed(const unsigned char *sha1,
 132                              struct packed_git *p, uint32_t pos,
 133                              void *data)
 134 {
 135         struct object *obj = lookup_object(sha1);
 136
 137         if (obj && obj->flags & SEEN)
 138                 return 0;
 139         add_recent_object(sha1, p->mtime, data);
 140         return 0;
 141 }
 142
 143 int add_unseen_recent_objects_to_traversal(struct rev_info *revs,
 144                                            unsigned long timestamp)
 145 {
 146         struct recent_data data;
 147         int r;
 148
 149         data.revs = revs;
 150         data.timestamp = timestamp;
 151
 152         r = for_each_loose_object(add_recent_loose, &data,
 153                                   FOR_EACH_OBJECT_LOCAL_ONLY);
 154         if (r)
 155                 return r;
 156         return for_each_packed_object(add_recent_packed, &data,
 157                                       FOR_EACH_OBJECT_LOCAL_ONLY);
 158 }
 159
 160 void mark_reachable_objects(struct rev_info *revs, int mark_reflog,
 161                             unsigned long mark_recent,
 162                             struct progress *progress)
 163 {
 164         struct connectivity_progress cp;
 165
 166         /*
 167          * Set up revision parsing, and mark us as being interested
 168          * in all object types, not just commits.
 169          */
 170         revs->tag_objects = 1;
 171         revs->blob_objects = 1;
 172         revs->tree_objects = 1;
 173
 174         /* Add all refs from the index file */
 175         add_index_objects_to_pending(revs, 0);
 176
 177         /* Add all external refs */
 178         for_each_ref(add_one_ref, revs);
 179
 180         /* detached HEAD is not included in the list above */
 181         head_ref(add_one_ref, revs);
 182
 183         /* Add all reflog info */
 184         if (mark_reflog)
 185                 add_reflogs_to_pending(revs, 0);
 186
 187         cp.progress = progress;
 188         cp.count = 0;
 189
 190         /*
 191          * Set up the revision walk - this will move all commits
 192          * from the pending list to the commit walking list.
 193          */
 194         if (prepare_revision_walk(revs))
 195                 die("revision walk setup failed");
 196         traverse_commit_list(revs, mark_commit, mark_object, &cp);
 197
 198         if (mark_recent) {
 199                 revs->ignore_missing_links = 1;
 200                 if (add_unseen_recent_objects_to_traversal(revs, mark_recent))
 201                         die("unable to mark recent objects");
 202                 if (prepare_revision_walk(revs))
 203                         die("revision walk setup failed");
 204                 traverse_commit_list(revs, mark_commit, mark_object, &cp);
 205         }
 206
 207         display_progress(cp.progress, cp.count);
 208 }