git.oblomov.eu Git - git/blob - 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
  15 struct traversal_context {
  16         struct rev_info *revs;
  17         show_object_fn show_object;
  18         show_commit_fn show_commit;
  19         void *show_data;
  20         filter_object_fn filter_fn;
  21         void *filter_data;
  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 = LOFR_MARK_SEEN | LOFR_DO_SHOW;
  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         if (!(obj->flags & USER_GIVEN) && ctx->filter_fn)
  57                 r = ctx->filter_fn(LOFS_BLOB, obj,
  58                                    path->buf, &path->buf[pathlen],
  59                                    ctx->filter_data);
  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(&entry, base, 0,
 116                                                        &ctx->revs->diffopt.pathspec);
 117                         if (match == all_entries_not_interesting)
 118                                 break;
 119                         if (match == entry_not_interesting)
 120                                 continue;
 121                 }
 122
 123                 if (S_ISDIR(entry.mode))
 124                         process_tree(ctx,
 125                                      lookup_tree(the_repository, entry.oid),
 126                                      base, entry.path);
 127                 else if (S_ISGITLINK(entry.mode))
 128                         process_gitlink(ctx, entry.oid->hash,
 129                                         base, entry.path);
 130                 else
 131                         process_blob(ctx,
 132                                      lookup_blob(the_repository, entry.oid),
 133                                      base, entry.path);
 134         }
 135 }
 136
 137 static void process_tree(struct traversal_context *ctx,
 138                          struct tree *tree,
 139                          struct strbuf *base,
 140                          const char *name)
 141 {
 142         struct object *obj = &tree->object;
 143         struct rev_info *revs = ctx->revs;
 144         int baselen = base->len;
 145         enum list_objects_filter_result r = LOFR_MARK_SEEN | LOFR_DO_SHOW;
 146         int failed_parse;
 147
 148         if (!revs->tree_objects)
 149                 return;
 150         if (!obj)
 151                 die("bad tree object");
 152         if (obj->flags & (UNINTERESTING | SEEN))
 153                 return;
 154
 155         failed_parse = parse_tree_gently(tree, 1);
 156         if (failed_parse) {
 157                 if (revs->ignore_missing_links)
 158                         return;
 159
 160                 /*
 161                  * Pre-filter known-missing tree objects when explicitly
 162                  * requested.  This may cause the actual filter to report
 163                  * an incomplete list of missing objects.
 164                  */
 165                 if (revs->exclude_promisor_objects &&
 166                     is_promisor_object(&obj->oid))
 167                         return;
 168
 169                 if (!revs->do_not_die_on_missing_tree)
 170                         die("bad tree object %s", oid_to_hex(&obj->oid));
 171         }
 172
 173         strbuf_addstr(base, name);
 174         if (!(obj->flags & USER_GIVEN) && ctx->filter_fn)
 175                 r = ctx->filter_fn(LOFS_BEGIN_TREE, obj,
 176                                    base->buf, &base->buf[baselen],
 177                                    ctx->filter_data);
 178         if (r & LOFR_MARK_SEEN)
 179                 obj->flags |= SEEN;
 180         if (r & LOFR_DO_SHOW)
 181                 ctx->show_object(obj, base->buf, ctx->show_data);
 182         if (base->len)
 183                 strbuf_addch(base, '/');
 184
 185         if (!failed_parse)
 186                 process_tree_contents(ctx, tree, base);
 187
 188         if (!(obj->flags & USER_GIVEN) && ctx->filter_fn) {
 189                 r = ctx->filter_fn(LOFS_END_TREE, obj,
 190                                    base->buf, &base->buf[baselen],
 191                                    ctx->filter_data);
 192                 if (r & LOFR_MARK_SEEN)
 193                         obj->flags |= SEEN;
 194                 if (r & LOFR_DO_SHOW)
 195                         ctx->show_object(obj, base->buf, ctx->show_data);
 196         }
 197
 198         strbuf_setlen(base, baselen);
 199         free_tree_buffer(tree);
 200 }
 201
 202 static void mark_edge_parents_uninteresting(struct commit *commit,
 203                                             struct rev_info *revs,
 204                                             show_edge_fn show_edge)
 205 {
 206         struct commit_list *parents;
 207
 208         for (parents = commit->parents; parents; parents = parents->next) {
 209                 struct commit *parent = parents->item;
 210                 if (!(parent->object.flags & UNINTERESTING))
 211                         continue;
 212                 mark_tree_uninteresting(get_commit_tree(parent));
 213                 if (revs->edge_hint && !(parent->object.flags & SHOWN)) {
 214                         parent->object.flags |= SHOWN;
 215                         show_edge(parent);
 216                 }
 217         }
 218 }
 219
 220 void mark_edges_uninteresting(struct rev_info *revs, show_edge_fn show_edge)
 221 {
 222         struct commit_list *list;
 223         int i;
 224
 225         for (list = revs->commits; list; list = list->next) {
 226                 struct commit *commit = list->item;
 227
 228                 if (commit->object.flags & UNINTERESTING) {
 229                         mark_tree_uninteresting(get_commit_tree(commit));
 230                         if (revs->edge_hint_aggressive && !(commit->object.flags & SHOWN)) {
 231                                 commit->object.flags |= SHOWN;
 232                                 show_edge(commit);
 233                         }
 234                         continue;
 235                 }
 236                 mark_edge_parents_uninteresting(commit, revs, show_edge);
 237         }
 238         if (revs->edge_hint_aggressive) {
 239                 for (i = 0; i < revs->cmdline.nr; i++) {
 240                         struct object *obj = revs->cmdline.rev[i].item;
 241                         struct commit *commit = (struct commit *)obj;
 242                         if (obj->type != OBJ_COMMIT || !(obj->flags & UNINTERESTING))
 243                                 continue;
 244                         mark_tree_uninteresting(get_commit_tree(commit));
 245                         if (!(obj->flags & SHOWN)) {
 246                                 obj->flags |= SHOWN;
 247                                 show_edge(commit);
 248                         }
 249                 }
 250         }
 251 }
 252
 253 static void add_pending_tree(struct rev_info *revs, struct tree *tree)
 254 {
 255         add_pending_object(revs, &tree->object, "");
 256 }
 257
 258 static void traverse_trees_and_blobs(struct traversal_context *ctx,
 259                                      struct strbuf *base)
 260 {
 261         int i;
 262
 263         assert(base->len == 0);
 264
 265         for (i = 0; i < ctx->revs->pending.nr; i++) {
 266                 struct object_array_entry *pending = ctx->revs->pending.objects + i;
 267                 struct object *obj = pending->item;
 268                 const char *name = pending->name;
 269                 const char *path = pending->path;
 270                 if (obj->flags & (UNINTERESTING | SEEN))
 271                         continue;
 272                 if (obj->type == OBJ_TAG) {
 273                         obj->flags |= SEEN;
 274                         ctx->show_object(obj, name, ctx->show_data);
 275                         continue;
 276                 }
 277                 if (!path)
 278                         path = "";
 279                 if (obj->type == OBJ_TREE) {
 280                         process_tree(ctx, (struct tree *)obj, base, path);
 281                         continue;
 282                 }
 283                 if (obj->type == OBJ_BLOB) {
 284                         process_blob(ctx, (struct blob *)obj, base, path);
 285                         continue;
 286                 }
 287                 die("unknown pending object %s (%s)",
 288                     oid_to_hex(&obj->oid), name);
 289         }
 290         object_array_clear(&ctx->revs->pending);
 291 }
 292
 293 static void do_traverse(struct traversal_context *ctx)
 294 {
 295         struct commit *commit;
 296         struct strbuf csp; /* callee's scratch pad */
 297         strbuf_init(&csp, PATH_MAX);
 298
 299         while ((commit = get_revision(ctx->revs)) != NULL) {
 300                 /*
 301                  * an uninteresting boundary commit may not have its tree
 302                  * parsed yet, but we are not going to show them anyway
 303                  */
 304                 if (get_commit_tree(commit))
 305                         add_pending_tree(ctx->revs, get_commit_tree(commit));
 306                 ctx->show_commit(commit, ctx->show_data);
 307
 308                 if (ctx->revs->tree_blobs_in_commit_order)
 309                         /*
 310                          * NEEDSWORK: Adding the tree and then flushing it here
 311                          * needs a reallocation for each commit. Can we pass the
 312                          * tree directory without allocation churn?
 313                          */
 314                         traverse_trees_and_blobs(ctx, &csp);
 315         }
 316         traverse_trees_and_blobs(ctx, &csp);
 317         strbuf_release(&csp);
 318 }
 319
 320 void traverse_commit_list(struct rev_info *revs,
 321                           show_commit_fn show_commit,
 322                           show_object_fn show_object,
 323                           void *show_data)
 324 {
 325         struct traversal_context ctx;
 326         ctx.revs = revs;
 327         ctx.show_commit = show_commit;
 328         ctx.show_object = show_object;
 329         ctx.show_data = show_data;
 330         ctx.filter_fn = NULL;
 331         ctx.filter_data = NULL;
 332         do_traverse(&ctx);
 333 }
 334
 335 void traverse_commit_list_filtered(
 336         struct list_objects_filter_options *filter_options,
 337         struct rev_info *revs,
 338         show_commit_fn show_commit,
 339         show_object_fn show_object,
 340         void *show_data,
 341         struct oidset *omitted)
 342 {
 343         struct traversal_context ctx;
 344         filter_free_fn filter_free_fn = NULL;
 345
 346         ctx.revs = revs;
 347         ctx.show_object = show_object;
 348         ctx.show_commit = show_commit;
 349         ctx.show_data = show_data;
 350         ctx.filter_fn = NULL;
 351
 352         ctx.filter_data = list_objects_filter__init(omitted, filter_options,
 353                                                     &ctx.filter_fn, &filter_free_fn);
 354         do_traverse(&ctx);
 355         if (ctx.filter_data && filter_free_fn)
 356                 filter_free_fn(ctx.filter_data);
 357 }