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