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