list-objects.c

   1 #include "cache.h"
   2 #include "tag.h"
   3 #include "commit.h"
   4 #include "tree.h"
   5 #include "blob.h"
   6 #include "diff.h"
   7 #include "tree-walk.h"
   8 #include "revision.h"
   9 #include "list-objects.h"
  10
  11 static void process_blob(struct rev_info *revs,
  12                          struct blob *blob,
  13                          show_object_fn show,
  14                          struct name_path *path,
  15                          const char *name)
  16 {
  17         struct object *obj = &blob->object;
  18
  19         if (!revs->blob_objects)
  20                 return;
  21         if (!obj)
  22                 die("bad blob object");
  23         if (obj->flags & (UNINTERESTING | SEEN))
  24                 return;
  25         obj->flags |= SEEN;
  26         show(obj, path, name);
  27 }
  28
  29 /*
  30  * Processing a gitlink entry currently does nothing, since
  31  * we do not recurse into the subproject.
  32  *
  33  * We *could* eventually add a flag that actually does that,
  34  * which would involve:
  35  *  - is the subproject actually checked out?
  36  *  - if so, see if the subproject has already been added
  37  *    to the alternates list, and add it if not.
  38  *  - process the commit (or tag) the gitlink points to
  39  *    recursively.
  40  *
  41  * However, it's unclear whether there is really ever any
  42  * reason to see superprojects and subprojects as such a
  43  * "unified" object pool (potentially resulting in a totally
  44  * humongous pack - avoiding which was the whole point of
  45  * having gitlinks in the first place!).
  46  *
  47  * So for now, there is just a note that we *could* follow
  48  * the link, and how to do it. Whether it necessarily makes
  49  * any sense what-so-ever to ever do that is another issue.
  50  */
  51 static void process_gitlink(struct rev_info *revs,
  52                             const unsigned char *sha1,
  53                             show_object_fn show,
  54                             struct name_path *path,
  55                             const char *name)
  56 {
  57         /* Nothing to do */
  58 }
  59
  60 static void process_tree(struct rev_info *revs,
  61                          struct tree *tree,
  62                          show_object_fn show,
  63                          struct name_path *path,
  64                          const char *name)
  65 {
  66         struct object *obj = &tree->object;
  67         struct tree_desc desc;
  68         struct name_entry entry;
  69         struct name_path me;
  70
  71         if (!revs->tree_objects)
  72                 return;
  73         if (!obj)
  74                 die("bad tree object");
  75         if (obj->flags & (UNINTERESTING | SEEN))
  76                 return;
  77         if (obj->flags & FACE_VALUE) {
  78                 obj->flags |= SEEN;
  79                 show(obj, path, name);
  80                 /* not parsing the tree saves a lot of time! */
  81                 return;
  82         }
  83
  84         if (parse_tree(tree) < 0)
  85                 die("bad tree object %s", sha1_to_hex(obj->sha1));
  86         obj->flags |= SEEN;
  87         show(obj, path, name);
  88
  89         me.up = path;
  90         me.elem = name;
  91         me.elem_len = strlen(name);
  92         init_tree_desc(&desc, tree->buffer, tree->size);
  93
  94         while (tree_entry(&desc, &entry)) {
  95                 if (S_ISDIR(entry.mode)) {
  96                         struct tree *subtree = lookup_tree(entry.sha1);
  97                         if (!subtree)
  98                                 continue;
  99
 100                         subtree->object.flags &= ~FACE_VALUE;
 101                         process_tree(revs,
 102                                      subtree,
 103                                      show, &me, entry.path);
 104                 } else if (S_ISGITLINK(entry.mode))
 105                         process_gitlink(revs, entry.sha1,
 106                                         show, &me, entry.path);
 107                 else
 108                         process_blob(revs,
 109                                      lookup_blob(entry.sha1),
 110                                      show, &me, entry.path);
 111         }
 112         free(tree->buffer);
 113         tree->buffer = NULL;
 114 }
 115
 116 static void mark_edge_parents_uninteresting(struct commit *commit,
 117                                             struct rev_info *revs,
 118                                             show_edge_fn show_edge)
 119 {
 120         struct commit_list *parents;
 121
 122         for (parents = commit->parents; parents; parents = parents->next) {
 123                 struct commit *parent = parents->item;
 124                 if (!(parent->object.flags & UNINTERESTING))
 125                         continue;
 126                 mark_tree_uninteresting(parent->tree);
 127                 if (revs->edge_hint && !(parent->object.flags & SHOWN)) {
 128                         parent->object.flags |= SHOWN;
 129                         show_edge(parent);
 130                 }
 131         }
 132 }
 133
 134 void mark_edges_uninteresting(struct commit_list *list,
 135                               struct rev_info *revs,
 136                               show_edge_fn show_edge)
 137 {
 138         for ( ; list; list = list->next) {
 139                 struct commit *commit = list->item;
 140
 141                 if (commit->object.flags & UNINTERESTING) {
 142                         mark_tree_uninteresting(commit->tree);
 143                         continue;
 144                 }
 145                 mark_edge_parents_uninteresting(commit, revs, show_edge);
 146         }
 147 }
 148
 149 static void add_pending_tree(struct rev_info *revs, struct tree *tree)
 150 {
 151         tree->object.flags &= ~FACE_VALUE;
 152         add_pending_object(revs, &tree->object, "");
 153 }
 154
 155 void traverse_commit_list(struct rev_info *revs,
 156                           show_commit_fn show_commit,
 157                           show_object_fn show_object,
 158                           void *data)
 159 {
 160         int i;
 161         struct commit *commit;
 162         enum object_type what = OBJ_TAG;
 163         char face_value = 0;
 164
 165         while ((commit = get_revision(revs)) != NULL) {
 166                 if (!(commit->object.flags & FACE_VALUE))
 167                         add_pending_tree(revs, commit->tree);
 168                 else
 169                         face_value = 1;
 170                 show_commit(commit, data);
 171         }
 172
 173 loop_objects:
 174         for (i = 0; i < revs->pending.nr; i++) {
 175                 struct object_array_entry *pending = revs->pending.objects + i;
 176                 struct object *obj = pending->item;
 177                 const char *name = pending->name;
 178                 if (obj->flags & (UNINTERESTING | SEEN))
 179                         continue;
 180                 if (obj->type != what && face_value)
 181                         continue;
 182
 183                 if (obj->type == OBJ_TAG) {
 184                         obj->flags |= SEEN;
 185                         show_object(obj, NULL, name);
 186                         continue;
 187                 }
 188                 if (obj->type == OBJ_TREE) {
 189                         process_tree(revs, (struct tree *)obj, show_object,
 190                                      NULL, name);
 191                         continue;
 192                 }
 193                 if (obj->type == OBJ_BLOB) {
 194                         process_blob(revs, (struct blob *)obj, show_object,
 195                                      NULL, name);
 196                         continue;
 197                 }
 198                 die("unknown pending object %s (%s)",
 199                     sha1_to_hex(obj->sha1), name);
 200         }
 201         if (face_value) {
 202                 switch (what) {
 203                 case OBJ_TAG :
 204                         what = OBJ_TREE;
 205                         goto loop_objects;
 206                 case OBJ_TREE :
 207                         what = OBJ_BLOB;
 208                         goto loop_objects;
 209                 default :
 210                         break;
 211                 }
 212         }
 213
 214         if (revs->pending.nr) {
 215                 free(revs->pending.objects);
 216                 revs->pending.nr = 0;
 217                 revs->pending.alloc = 0;
 218                 revs->pending.objects = NULL;
 219         }
 220 }