walker.c

   1 #include "cache.h"
   2 #include "walker.h"
   3 #include "repository.h"
   4 #include "object-store.h"
   5 #include "commit.h"
   6 #include "tree.h"
   7 #include "tree-walk.h"
   8 #include "tag.h"
   9 #include "blob.h"
  10 #include "refs.h"
  11 #include "progress.h"
  12
  13 static struct object_id current_commit_oid;
  14
  15 void walker_say(struct walker *walker, const char *fmt, ...)
  16 {
  17         if (walker->get_verbosely) {
  18                 va_list ap;
  19                 va_start(ap, fmt);
  20                 vfprintf(stderr, fmt, ap);
  21                 va_end(ap);
  22         }
  23 }
  24
  25 static void report_missing(const struct object *obj)
  26 {
  27         fprintf(stderr, "Cannot obtain needed %s %s\n",
  28                 obj->type ? type_name(obj->type): "object",
  29                 oid_to_hex(&obj->oid));
  30         if (!is_null_oid(&current_commit_oid))
  31                 fprintf(stderr, "while processing commit %s.\n",
  32                         oid_to_hex(&current_commit_oid));
  33 }
  34
  35 static int process(struct walker *walker, struct object *obj);
  36
  37 static int process_tree(struct walker *walker, struct tree *tree)
  38 {
  39         struct tree_desc desc;
  40         struct name_entry entry;
  41
  42         if (parse_tree(tree))
  43                 return -1;
  44
  45         init_tree_desc(&desc, tree->buffer, tree->size);
  46         while (tree_entry(&desc, &entry)) {
  47                 struct object *obj = NULL;
  48
  49                 /* submodule commits are not stored in the superproject */
  50                 if (S_ISGITLINK(entry.mode))
  51                         continue;
  52                 if (S_ISDIR(entry.mode)) {
  53                         struct tree *tree = lookup_tree(the_repository,
  54                                                         &entry.oid);
  55                         if (tree)
  56                                 obj = &tree->object;
  57                 }
  58                 else {
  59                         struct blob *blob = lookup_blob(the_repository,
  60                                                         &entry.oid);
  61                         if (blob)
  62                                 obj = &blob->object;
  63                 }
  64                 if (!obj || process(walker, obj))
  65                         return -1;
  66         }
  67         free_tree_buffer(tree);
  68         return 0;
  69 }
  70
  71 /* Remember to update object flag allocation in object.h */
  72 #define COMPLETE        (1U << 0)
  73 #define SEEN            (1U << 1)
  74 #define TO_SCAN         (1U << 2)
  75
  76 static struct commit_list *complete = NULL;
  77
  78 static int process_commit(struct walker *walker, struct commit *commit)
  79 {
  80         struct commit_list *parents;
  81
  82         if (parse_commit(commit))
  83                 return -1;
  84
  85         while (complete && complete->item->date >= commit->date) {
  86                 pop_most_recent_commit(&complete, COMPLETE);
  87         }
  88
  89         if (commit->object.flags & COMPLETE)
  90                 return 0;
  91
  92         oidcpy(&current_commit_oid, &commit->object.oid);
  93
  94         walker_say(walker, "walk %s\n", oid_to_hex(&commit->object.oid));
  95
  96         if (process(walker, &get_commit_tree(commit)->object))
  97                 return -1;
  98
  99         for (parents = commit->parents; parents; parents = parents->next) {
 100                 if (process(walker, &parents->item->object))
 101                         return -1;
 102         }
 103
 104         return 0;
 105 }
 106
 107 static int process_tag(struct walker *walker, struct tag *tag)
 108 {
 109         if (parse_tag(tag))
 110                 return -1;
 111         return process(walker, tag->tagged);
 112 }
 113
 114 static struct object_list *process_queue = NULL;
 115 static struct object_list **process_queue_end = &process_queue;
 116
 117 static int process_object(struct walker *walker, struct object *obj)
 118 {
 119         if (obj->type == OBJ_COMMIT) {
 120                 if (process_commit(walker, (struct commit *)obj))
 121                         return -1;
 122                 return 0;
 123         }
 124         if (obj->type == OBJ_TREE) {
 125                 if (process_tree(walker, (struct tree *)obj))
 126                         return -1;
 127                 return 0;
 128         }
 129         if (obj->type == OBJ_BLOB) {
 130                 return 0;
 131         }
 132         if (obj->type == OBJ_TAG) {
 133                 if (process_tag(walker, (struct tag *)obj))
 134                         return -1;
 135                 return 0;
 136         }
 137         return error("Unable to determine requirements "
 138                      "of type %s for %s",
 139                      type_name(obj->type), oid_to_hex(&obj->oid));
 140 }
 141
 142 static int process(struct walker *walker, struct object *obj)
 143 {
 144         if (obj->flags & SEEN)
 145                 return 0;
 146         obj->flags |= SEEN;
 147
 148         if (has_object_file(&obj->oid)) {
 149                 /* We already have it, so we should scan it now. */
 150                 obj->flags |= TO_SCAN;
 151         }
 152         else {
 153                 if (obj->flags & COMPLETE)
 154                         return 0;
 155                 walker->prefetch(walker, obj->oid.hash);
 156         }
 157
 158         object_list_insert(obj, process_queue_end);
 159         process_queue_end = &(*process_queue_end)->next;
 160         return 0;
 161 }
 162
 163 static int loop(struct walker *walker)
 164 {
 165         struct object_list *elem;
 166         struct progress *progress = NULL;
 167         uint64_t nr = 0;
 168
 169         if (walker->get_progress)
 170                 progress = start_delayed_progress(_("Fetching objects"), 0);
 171
 172         while (process_queue) {
 173                 struct object *obj = process_queue->item;
 174                 elem = process_queue;
 175                 process_queue = elem->next;
 176                 free(elem);
 177                 if (!process_queue)
 178                         process_queue_end = &process_queue;
 179
 180                 /* If we are not scanning this object, we placed it in
 181                  * the queue because we needed to fetch it first.
 182                  */
 183                 if (! (obj->flags & TO_SCAN)) {
 184                         if (walker->fetch(walker, obj->oid.hash)) {
 185                                 stop_progress(&progress);
 186                                 report_missing(obj);
 187                                 return -1;
 188                         }
 189                 }
 190                 if (!obj->type)
 191                         parse_object(the_repository, &obj->oid);
 192                 if (process_object(walker, obj)) {
 193                         stop_progress(&progress);
 194                         return -1;
 195                 }
 196                 display_progress(progress, ++nr);
 197         }
 198         stop_progress(&progress);
 199         return 0;
 200 }
 201
 202 static int interpret_target(struct walker *walker, char *target, struct object_id *oid)
 203 {
 204         if (!get_oid_hex(target, oid))
 205                 return 0;
 206         if (!check_refname_format(target, 0)) {
 207                 struct ref *ref = alloc_ref(target);
 208                 if (!walker->fetch_ref(walker, ref)) {
 209                         oidcpy(oid, &ref->old_oid);
 210                         free(ref);
 211                         return 0;
 212                 }
 213                 free(ref);
 214         }
 215         return -1;
 216 }
 217
 218 static int mark_complete(const char *path, const struct object_id *oid,
 219                          int flag, void *cb_data)
 220 {
 221         struct commit *commit = lookup_commit_reference_gently(the_repository,
 222                                                                oid, 1);
 223
 224         if (commit) {
 225                 commit->object.flags |= COMPLETE;
 226                 commit_list_insert(commit, &complete);
 227         }
 228         return 0;
 229 }
 230
 231 int walker_targets_stdin(char ***target, const char ***write_ref)
 232 {
 233         int targets = 0, targets_alloc = 0;
 234         struct strbuf buf = STRBUF_INIT;
 235         *target = NULL; *write_ref = NULL;
 236         while (1) {
 237                 char *rf_one = NULL;
 238                 char *tg_one;
 239
 240                 if (strbuf_getline_lf(&buf, stdin) == EOF)
 241                         break;
 242                 tg_one = buf.buf;
 243                 rf_one = strchr(tg_one, '\t');
 244                 if (rf_one)
 245                         *rf_one++ = 0;
 246
 247                 if (targets >= targets_alloc) {
 248                         targets_alloc = targets_alloc ? targets_alloc * 2 : 64;
 249                         REALLOC_ARRAY(*target, targets_alloc);
 250                         REALLOC_ARRAY(*write_ref, targets_alloc);
 251                 }
 252                 (*target)[targets] = xstrdup(tg_one);
 253                 (*write_ref)[targets] = xstrdup_or_null(rf_one);
 254                 targets++;
 255         }
 256         strbuf_release(&buf);
 257         return targets;
 258 }
 259
 260 void walker_targets_free(int targets, char **target, const char **write_ref)
 261 {
 262         while (targets--) {
 263                 free(target[targets]);
 264                 if (write_ref)
 265                         free((char *) write_ref[targets]);
 266         }
 267 }
 268
 269 int walker_fetch(struct walker *walker, int targets, char **target,
 270                  const char **write_ref, const char *write_ref_log_details)
 271 {
 272         struct strbuf refname = STRBUF_INIT;
 273         struct strbuf err = STRBUF_INIT;
 274         struct ref_transaction *transaction = NULL;
 275         struct object_id *oids;
 276         char *msg = NULL;
 277         int i, ret = -1;
 278
 279         save_commit_buffer = 0;
 280
 281         ALLOC_ARRAY(oids, targets);
 282
 283         if (write_ref) {
 284                 transaction = ref_transaction_begin(&err);
 285                 if (!transaction) {
 286                         error("%s", err.buf);
 287                         goto done;
 288                 }
 289         }
 290
 291         if (!walker->get_recover) {
 292                 for_each_ref(mark_complete, NULL);
 293                 commit_list_sort_by_date(&complete);
 294         }
 295
 296         for (i = 0; i < targets; i++) {
 297                 if (interpret_target(walker, target[i], oids + i)) {
 298                         error("Could not interpret response from server '%s' as something to pull", target[i]);
 299                         goto done;
 300                 }
 301                 if (process(walker, lookup_unknown_object(the_repository, &oids[i])))
 302                         goto done;
 303         }
 304
 305         if (loop(walker))
 306                 goto done;
 307         if (!write_ref) {
 308                 ret = 0;
 309                 goto done;
 310         }
 311         if (write_ref_log_details) {
 312                 msg = xstrfmt("fetch from %s", write_ref_log_details);
 313         } else {
 314                 msg = NULL;
 315         }
 316         for (i = 0; i < targets; i++) {
 317                 if (!write_ref[i])
 318                         continue;
 319                 strbuf_reset(&refname);
 320                 strbuf_addf(&refname, "refs/%s", write_ref[i]);
 321                 if (ref_transaction_update(transaction, refname.buf,
 322                                            oids + i, NULL, 0,
 323                                            msg ? msg : "fetch (unknown)",
 324                                            &err)) {
 325                         error("%s", err.buf);
 326                         goto done;
 327                 }
 328         }
 329         if (ref_transaction_commit(transaction, &err)) {
 330                 error("%s", err.buf);
 331                 goto done;
 332         }
 333
 334         ret = 0;
 335
 336 done:
 337         ref_transaction_free(transaction);
 338         free(msg);
 339         free(oids);
 340         strbuf_release(&err);
 341         strbuf_release(&refname);
 342         return ret;
 343 }
 344
 345 void walker_free(struct walker *walker)
 346 {
 347         walker->cleanup(walker);
 348         free(walker);
 349 }