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 #include "list-objects-filter.h"
  11 #include "list-objects-filter-options.h"
  12 #include "packfile.h"
  13 #include "object-store.h"
  14 #include "trace.h"
  15
  16 struct traversal_context {
  17         struct rev_info *revs;
  18         show_object_fn show_object;
  19         show_commit_fn show_commit;
  20         void *show_data;
  21         struct filter *filter;
  22 };
  23
  24 static void process_blob(struct traversal_context *ctx,
  25                          struct blob *blob,
  26                          struct strbuf *path,
  27                          const char *name)
  28 {
  29         struct object *obj = &blob->object;
  30         size_t pathlen;
  31         enum list_objects_filter_result r;
  32
  33         if (!ctx->revs->blob_objects)
  34                 return;
  35         if (!obj)
  36                 die("bad blob object");
  37         if (obj->flags & (UNINTERESTING | SEEN))
  38                 return;
  39
  40         /*
  41          * Pre-filter known-missing objects when explicitly requested.
  42          * Otherwise, a missing object error message may be reported
  43          * later (depending on other filtering criteria).
  44          *
  45          * Note that this "--exclude-promisor-objects" pre-filtering
  46          * may cause the actual filter to report an incomplete list
  47          * of missing objects.
  48          */
  49         if (ctx->revs->exclude_promisor_objects &&
  50             !has_object_file(&obj->oid) &&
  51             is_promisor_object(&obj->oid))
  52                 return;
  53
  54         pathlen = path->len;
  55         strbuf_addstr(path, name);
  56         r = list_objects_filter__filter_object(ctx->revs->repo,
  57                                                LOFS_BLOB, obj,
  58                                                path->buf, &path->buf[pathlen],
  59                                                ctx->filter);
  60         if (r & LOFR_MARK_SEEN)
  61                 obj->flags |= SEEN;
  62         if (r & LOFR_DO_SHOW)
  63                 ctx->show_object(obj, path->buf, ctx->show_data);
  64         strbuf_setlen(path, pathlen);
  65 }
  66
  67 /*
  68  * Processing a gitlink entry currently does nothing, since
  69  * we do not recurse into the subproject.
  70  *
  71  * We *could* eventually add a flag that actually does that,
  72  * which would involve:
  73  *  - is the subproject actually checked out?
  74  *  - if so, see if the subproject has already been added
  75  *    to the alternates list, and add it if not.
  76  *  - process the commit (or tag) the gitlink points to
  77  *    recursively.
  78  *
  79  * However, it's unclear whether there is really ever any
  80  * reason to see superprojects and subprojects as such a
  81  * "unified" object pool (potentially resulting in a totally
  82  * humongous pack - avoiding which was the whole point of
  83  * having gitlinks in the first place!).
  84  *
  85  * So for now, there is just a note that we *could* follow
  86  * the link, and how to do it. Whether it necessarily makes
  87  * any sense what-so-ever to ever do that is another issue.
  88  */
  89 static void process_gitlink(struct traversal_context *ctx,
  90                             const unsigned char *sha1,
  91                             struct strbuf *path,
  92                             const char *name)
  93 {
  94         /* Nothing to do */
  95 }
  96
  97 static void process_tree(struct traversal_context *ctx,
  98                          struct tree *tree,
  99                          struct strbuf *base,
 100                          const char *name);
 101
 102 static void process_tree_contents(struct traversal_context *ctx,
 103                                   struct tree *tree,
 104                                   struct strbuf *base)
 105 {
 106         struct tree_desc desc;
 107         struct name_entry entry;
 108         enum interesting match = ctx->revs->diffopt.pathspec.nr == 0 ?
 109                 all_entries_interesting : entry_not_interesting;
 110
 111         init_tree_desc(&desc, tree->buffer, tree->size);
 112
 113         while (tree_entry(&desc, &entry)) {
 114                 if (match != all_entries_interesting) {
 115                         match = tree_entry_interesting(ctx->revs->repo->index,
 116                                                        &entry, base, 0,
 117                                                        &ctx->revs->diffopt.pathspec);
 118                         if (match == all_entries_not_interesting)
 119                                 break;
 120                         if (match == entry_not_interesting)
 121                                 continue;
 122                 }
 123
 124                 if (S_ISDIR(entry.mode)) {
 125                         struct tree *t = lookup_tree(ctx->revs->repo, &entry.oid);
 126                         if (!t) {
 127                                 die(_("entry '%s' in tree %s has tree mode, "
 128                                       "but is not a tree"),
 129                                     entry.path, oid_to_hex(&tree->object.oid));
 130                         }
 131                         t->object.flags |= NOT_USER_GIVEN;
 132                         process_tree(ctx, t, base, entry.path);
 133                 }
 134                 else if (S_ISGITLINK(entry.mode))
 135                         process_gitlink(ctx, entry.oid.hash,
 136                                         base, entry.path);
 137                 else {
 138                         struct blob *b = lookup_blob(ctx->revs->repo, &entry.oid);
 139                         if (!b) {
 140                                 die(_("entry '%s' in tree %s has blob mode, "
 141                                       "but is not a blob"),
 142                                     entry.path, oid_to_hex(&tree->object.oid));
 143                         }
 144                         b->object.flags |= NOT_USER_GIVEN;
 145                         process_blob(ctx, b, base, entry.path);
 146                 }
 147         }
 148 }
 149
 150 static void process_tree(struct traversal_context *ctx,
 151                          struct tree *tree,
 152                          struct strbuf *base,
 153                          const char *name)
 154 {
 155         struct object *obj = &tree->object;
 156         struct rev_info *revs = ctx->revs;
 157         int baselen = base->len;
 158         enum list_objects_filter_result r;
 159         int failed_parse;
 160
 161         if (!revs->tree_objects)
 162                 return;
 163         if (!obj)
 164                 die("bad tree object");
 165         if (obj->flags & (UNINTERESTING | SEEN))
 166                 return;
 167
 168         failed_parse = parse_tree_gently(tree, 1);
 169         if (failed_parse) {
 170                 if (revs->ignore_missing_links)
 171                         return;
 172
 173                 /*
 174                  * Pre-filter known-missing tree objects when explicitly
 175                  * requested.  This may cause the actual filter to report
 176                  * an incomplete list of missing objects.
 177                  */
 178                 if (revs->exclude_promisor_objects &&
 179                     is_promisor_object(&obj->oid))
 180                         return;
 181
 182                 if (!revs->do_not_die_on_missing_tree)
 183                         die("bad tree object %s", oid_to_hex(&obj->oid));
 184         }
 185
 186         strbuf_addstr(base, name);
 187         r = list_objects_filter__filter_object(ctx->revs->repo,
 188                                                LOFS_BEGIN_TREE, obj,
 189                                                base->buf, &base->buf[baselen],
 190                                                ctx->filter);
 191         if (r & LOFR_MARK_SEEN)
 192                 obj->flags |= SEEN;
 193         if (r & LOFR_DO_SHOW)
 194                 ctx->show_object(obj, base->buf, ctx->show_data);
 195         if (base->len)
 196                 strbuf_addch(base, '/');
 197
 198         if (r & LOFR_SKIP_TREE)
 199                 trace_printf("Skipping contents of tree %s...\n", base->buf);
 200         else if (!failed_parse)
 201                 process_tree_contents(ctx, tree, base);
 202
 203         r = list_objects_filter__filter_object(ctx->revs->repo,
 204                                                LOFS_END_TREE, obj,
 205                                                base->buf, &base->buf[baselen],
 206                                                ctx->filter);
 207         if (r & LOFR_MARK_SEEN)
 208                 obj->flags |= SEEN;
 209         if (r & LOFR_DO_SHOW)
 210                 ctx->show_object(obj, base->buf, ctx->show_data);
 211
 212         strbuf_setlen(base, baselen);
 213         free_tree_buffer(tree);
 214 }
 215
 216 static void mark_edge_parents_uninteresting(struct commit *commit,
 217                                             struct rev_info *revs,
 218                                             show_edge_fn show_edge)
 219 {
 220         struct commit_list *parents;
 221
 222         for (parents = commit->parents; parents; parents = parents->next) {
 223                 struct commit *parent = parents->item;
 224                 if (!(parent->object.flags & UNINTERESTING))
 225                         continue;
 226                 mark_tree_uninteresting(revs->repo, get_commit_tree(parent));
 227                 if (revs->edge_hint && !(parent->object.flags & SHOWN)) {
 228                         parent->object.flags |= SHOWN;
 229                         show_edge(parent);
 230                 }
 231         }
 232 }
 233
 234 static void add_edge_parents(struct commit *commit,
 235                              struct rev_info *revs,
 236                              show_edge_fn show_edge,
 237                              struct oidset *set)
 238 {
 239         struct commit_list *parents;
 240
 241         for (parents = commit->parents; parents; parents = parents->next) {
 242                 struct commit *parent = parents->item;
 243                 struct tree *tree = get_commit_tree(parent);
 244
 245                 if (!tree)
 246                         continue;
 247
 248                 oidset_insert(set, &tree->object.oid);
 249
 250                 if (!(parent->object.flags & UNINTERESTING))
 251                         continue;
 252                 tree->object.flags |= UNINTERESTING;
 253
 254                 if (revs->edge_hint && !(parent->object.flags & SHOWN)) {
 255                         parent->object.flags |= SHOWN;
 256                         show_edge(parent);
 257                 }
 258         }
 259 }
 260
 261 void mark_edges_uninteresting(struct rev_info *revs,
 262                               show_edge_fn show_edge,
 263                               int sparse)
 264 {
 265         struct commit_list *list;
 266         int i;
 267
 268         if (sparse) {
 269                 struct oidset set;
 270                 oidset_init(&set, 16);
 271
 272                 for (list = revs->commits; list; list = list->next) {
 273                         struct commit *commit = list->item;
 274                         struct tree *tree = get_commit_tree(commit);
 275
 276                         if (commit->object.flags & UNINTERESTING)
 277                                 tree->object.flags |= UNINTERESTING;
 278
 279                         oidset_insert(&set, &tree->object.oid);
 280                         add_edge_parents(commit, revs, show_edge, &set);
 281                 }
 282
 283                 mark_trees_uninteresting_sparse(revs->repo, &set);
 284                 oidset_clear(&set);
 285         } else {
 286                 for (list = revs->commits; list; list = list->next) {
 287                         struct commit *commit = list->item;
 288                         if (commit->object.flags & UNINTERESTING) {
 289                                 mark_tree_uninteresting(revs->repo,
 290                                                         get_commit_tree(commit));
 291                                 if (revs->edge_hint_aggressive && !(commit->object.flags & SHOWN)) {
 292                                         commit->object.flags |= SHOWN;
 293                                         show_edge(commit);
 294                                 }
 295                                 continue;
 296                         }
 297                         mark_edge_parents_uninteresting(commit, revs, show_edge);
 298                 }
 299         }
 300
 301         if (revs->edge_hint_aggressive) {
 302                 for (i = 0; i < revs->cmdline.nr; i++) {
 303                         struct object *obj = revs->cmdline.rev[i].item;
 304                         struct commit *commit = (struct commit *)obj;
 305                         if (obj->type != OBJ_COMMIT || !(obj->flags & UNINTERESTING))
 306                                 continue;
 307                         mark_tree_uninteresting(revs->repo,
 308                                                 get_commit_tree(commit));
 309                         if (!(obj->flags & SHOWN)) {
 310                                 obj->flags |= SHOWN;
 311                                 show_edge(commit);
 312                         }
 313                 }
 314         }
 315 }
 316
 317 static void add_pending_tree(struct rev_info *revs, struct tree *tree)
 318 {
 319         add_pending_object(revs, &tree->object, "");
 320 }
 321
 322 static void traverse_trees_and_blobs(struct traversal_context *ctx,
 323                                      struct strbuf *base)
 324 {
 325         int i;
 326
 327         assert(base->len == 0);
 328
 329         for (i = 0; i < ctx->revs->pending.nr; i++) {
 330                 struct object_array_entry *pending = ctx->revs->pending.objects + i;
 331                 struct object *obj = pending->item;
 332                 const char *name = pending->name;
 333                 const char *path = pending->path;
 334                 if (obj->flags & (UNINTERESTING | SEEN))
 335                         continue;
 336                 if (obj->type == OBJ_TAG) {
 337                         obj->flags |= SEEN;
 338                         ctx->show_object(obj, name, ctx->show_data);
 339                         continue;
 340                 }
 341                 if (!path)
 342                         path = "";
 343                 if (obj->type == OBJ_TREE) {
 344                         process_tree(ctx, (struct tree *)obj, base, path);
 345                         continue;
 346                 }
 347                 if (obj->type == OBJ_BLOB) {
 348                         process_blob(ctx, (struct blob *)obj, base, path);
 349                         continue;
 350                 }
 351                 die("unknown pending object %s (%s)",
 352                     oid_to_hex(&obj->oid), name);
 353         }
 354         object_array_clear(&ctx->revs->pending);
 355 }
 356
 357 static void do_traverse(struct traversal_context *ctx)
 358 {
 359         struct commit *commit;
 360         struct strbuf csp; /* callee's scratch pad */
 361         strbuf_init(&csp, PATH_MAX);
 362
 363         while ((commit = get_revision(ctx->revs)) != NULL) {
 364                 /*
 365                  * an uninteresting boundary commit may not have its tree
 366                  * parsed yet, but we are not going to show them anyway
 367                  */
 368                 if (!ctx->revs->tree_objects)
 369                         ; /* do not bother loading tree */
 370                 else if (get_commit_tree(commit)) {
 371                         struct tree *tree = get_commit_tree(commit);
 372                         tree->object.flags |= NOT_USER_GIVEN;
 373                         add_pending_tree(ctx->revs, tree);
 374                 } else if (commit->object.parsed) {
 375                         die(_("unable to load root tree for commit %s"),
 376                               oid_to_hex(&commit->object.oid));
 377                 }
 378                 ctx->show_commit(commit, ctx->show_data);
 379
 380                 if (ctx->revs->tree_blobs_in_commit_order)
 381                         /*
 382                          * NEEDSWORK: Adding the tree and then flushing it here
 383                          * needs a reallocation for each commit. Can we pass the
 384                          * tree directory without allocation churn?
 385                          */
 386                         traverse_trees_and_blobs(ctx, &csp);
 387         }
 388         traverse_trees_and_blobs(ctx, &csp);
 389         strbuf_release(&csp);
 390 }
 391
 392 void traverse_commit_list(struct rev_info *revs,
 393                           show_commit_fn show_commit,
 394                           show_object_fn show_object,
 395                           void *show_data)
 396 {
 397         struct traversal_context ctx;
 398         ctx.revs = revs;
 399         ctx.show_commit = show_commit;
 400         ctx.show_object = show_object;
 401         ctx.show_data = show_data;
 402         ctx.filter = NULL;
 403         do_traverse(&ctx);
 404 }
 405
 406 void traverse_commit_list_filtered(
 407         struct list_objects_filter_options *filter_options,
 408         struct rev_info *revs,
 409         show_commit_fn show_commit,
 410         show_object_fn show_object,
 411         void *show_data,
 412         struct oidset *omitted)
 413 {
 414         struct traversal_context ctx;
 415
 416         ctx.revs = revs;
 417         ctx.show_object = show_object;
 418         ctx.show_commit = show_commit;
 419         ctx.show_data = show_data;
 420         ctx.filter = list_objects_filter__init(omitted, filter_options);
 421         do_traverse(&ctx);
 422         list_objects_filter__free(ctx.filter);
 423 }