walker.c

   1 #include "cache.h"
   2 #include "gettext.h"
   3 #include "hex.h"
   4 #include "walker.h"
   5 #include "repository.h"
   6 #include "object-store.h"
   7 #include "commit.h"
   8 #include "tree.h"
   9 #include "tree-walk.h"
  10 #include "tag.h"
  11 #include "blob.h"
  12 #include "refs.h"
  13 #include "progress.h"
  14
  15 static struct object_id current_commit_oid;
  16
  17 void walker_say(struct walker *walker, const char *fmt, ...)
  18 {
  19         if (walker->get_verbosely) {
  20                 va_list ap;
  21                 va_start(ap, fmt);
  22                 vfprintf(stderr, fmt, ap);
  23                 va_end(ap);
  24         }
  25 }
  26
  27 static void report_missing(const struct object *obj)
  28 {
  29         fprintf(stderr, "Cannot obtain needed %s %s\n",
  30                 obj->type ? type_name(obj->type): "object",
  31                 oid_to_hex(&obj->oid));
  32         if (!is_null_oid(&current_commit_oid))
  33                 fprintf(stderr, "while processing commit %s.\n",
  34                         oid_to_hex(&current_commit_oid));
  35 }
  36
  37 static int process(struct walker *walker, struct object *obj);
  38
  39 static int process_tree(struct walker *walker, struct tree *tree)
  40 {
  41         struct tree_desc desc;
  42         struct name_entry entry;
  43
  44         if (parse_tree(tree))
  45                 return -1;
  46
  47         init_tree_desc(&desc, tree->buffer, tree->size);
  48         while (tree_entry(&desc, &entry)) {
  49                 struct object *obj = NULL;
  50
  51                 /* submodule commits are not stored in the superproject */
  52                 if (S_ISGITLINK(entry.mode))
  53                         continue;
  54                 if (S_ISDIR(entry.mode)) {
  55                         struct tree *tree = lookup_tree(the_repository,
  56                                                         &entry.oid);
  57                         if (tree)
  58                                 obj = &tree->object;
  59                 }
  60                 else {
  61                         struct blob *blob = lookup_blob(the_repository,
  62                                                         &entry.oid);
  63                         if (blob)
  64                                 obj = &blob->object;
  65                 }
  66                 if (!obj || process(walker, obj))
  67                         return -1;
  68         }
  69         free_tree_buffer(tree);
  70         return 0;
  71 }
  72
  73 /* Remember to update object flag allocation in object.h */
  74 #define COMPLETE        (1U << 0)
  75 #define SEEN            (1U << 1)
  76 #define TO_SCAN         (1U << 2)
  77
  78 static struct commit_list *complete = NULL;
  79
  80 static int process_commit(struct walker *walker, struct commit *commit)
  81 {
  82         struct commit_list *parents;
  83
  84         if (repo_parse_commit(the_repository, commit))
  85                 return -1;
  86
  87         while (complete && complete->item->date >= commit->date) {
  88                 pop_most_recent_commit(&complete, COMPLETE);
  89         }
  90
  91         if (commit->object.flags & COMPLETE)
  92                 return 0;
  93
  94         oidcpy(&current_commit_oid, &commit->object.oid);
  95
  96         walker_say(walker, "walk %s\n", oid_to_hex(&commit->object.oid));
  97
  98         if (process(walker, &repo_get_commit_tree(the_repository, commit)->object))
  99                 return -1;
 100
 101         for (parents = commit->parents; parents; parents = parents->next) {
 102                 if (process(walker, &parents->item->object))
 103                         return -1;
 104         }
 105
 106         return 0;
 107 }
 108
 109 static int process_tag(struct walker *walker, struct tag *tag)
 110 {
 111         if (parse_tag(tag))
 112                 return -1;
 113         return process(walker, tag->tagged);
 114 }
 115
 116 static struct object_list *process_queue = NULL;
 117 static struct object_list **process_queue_end = &process_queue;
 118
 119 static int process_object(struct walker *walker, struct object *obj)
 120 {
 121         if (obj->type == OBJ_COMMIT) {
 122                 if (process_commit(walker, (struct commit *)obj))
 123                         return -1;
 124                 return 0;
 125         }
 126         if (obj->type == OBJ_TREE) {
 127                 if (process_tree(walker, (struct tree *)obj))
 128                         return -1;
 129                 return 0;
 130         }
 131         if (obj->type == OBJ_BLOB) {
 132                 return 0;
 133         }
 134         if (obj->type == OBJ_TAG) {
 135                 if (process_tag(walker, (struct tag *)obj))
 136                         return -1;
 137                 return 0;
 138         }
 139         return error("Unable to determine requirements "
 140                      "of type %s for %s",
 141                      type_name(obj->type), oid_to_hex(&obj->oid));
 142 }
 143
 144 static int process(struct walker *walker, struct object *obj)
 145 {
 146         if (obj->flags & SEEN)
 147                 return 0;
 148         obj->flags |= SEEN;
 149
 150         if (repo_has_object_file(the_repository, &obj->oid)) {
 151                 /* We already have it, so we should scan it now. */
 152                 obj->flags |= TO_SCAN;
 153         }
 154         else {
 155                 if (obj->flags & COMPLETE)
 156                         return 0;
 157                 walker->prefetch(walker, obj->oid.hash);
 158         }
 159
 160         object_list_insert(obj, process_queue_end);
 161         process_queue_end = &(*process_queue_end)->next;
 162         return 0;
 163 }
 164
 165 static int loop(struct walker *walker)
 166 {
 167         struct object_list *elem;
 168         struct progress *progress = NULL;
 169         uint64_t nr = 0;
 170
 171         if (walker->get_progress)
 172                 progress = start_delayed_progress(_("Fetching objects"), 0);
 173
 174         while (process_queue) {
 175                 struct object *obj = process_queue->item;
 176                 elem = process_queue;
 177                 process_queue = elem->next;
 178                 free(elem);
 179                 if (!process_queue)
 180                         process_queue_end = &process_queue;
 181
 182                 /* If we are not scanning this object, we placed it in
 183                  * the queue because we needed to fetch it first.
 184                  */
 185                 if (! (obj->flags & TO_SCAN)) {
 186                         if (walker->fetch(walker, obj->oid.hash)) {
 187                                 stop_progress(&progress);
 188                                 report_missing(obj);
 189                                 return -1;
 190                         }
 191                 }
 192                 if (!obj->type)
 193                         parse_object(the_repository, &obj->oid);
 194                 if (process_object(walker, obj)) {
 195                         stop_progress(&progress);
 196                         return -1;
 197                 }
 198                 display_progress(progress, ++nr);
 199         }
 200         stop_progress(&progress);
 201         return 0;
 202 }
 203
 204 static int interpret_target(struct walker *walker, char *target, struct object_id *oid)
 205 {
 206         if (!get_oid_hex(target, oid))
 207                 return 0;
 208         if (!check_refname_format(target, 0)) {
 209                 struct ref *ref = alloc_ref(target);
 210                 if (!walker->fetch_ref(walker, ref)) {
 211                         oidcpy(oid, &ref->old_oid);
 212                         free(ref);
 213                         return 0;
 214                 }
 215                 free(ref);
 216         }
 217         return -1;
 218 }
 219
 220 static int mark_complete(const char *path UNUSED,
 221                          const struct object_id *oid,
 222                          int flag UNUSED,
 223                          void *cb_data UNUSED)
 224 {
 225         struct commit *commit = lookup_commit_reference_gently(the_repository,
 226                                                                oid, 1);
 227
 228         if (commit) {
 229                 commit->object.flags |= COMPLETE;
 230                 commit_list_insert(commit, &complete);
 231         }
 232         return 0;
 233 }
 234
 235 int walker_targets_stdin(char ***target, const char ***write_ref)
 236 {
 237         int targets = 0, targets_alloc = 0;
 238         struct strbuf buf = STRBUF_INIT;
 239         *target = NULL; *write_ref = NULL;
 240         while (1) {
 241                 char *rf_one = NULL;
 242                 char *tg_one;
 243
 244                 if (strbuf_getline_lf(&buf, stdin) == EOF)
 245                         break;
 246                 tg_one = buf.buf;
 247                 rf_one = strchr(tg_one, '\t');
 248                 if (rf_one)
 249                         *rf_one++ = 0;
 250
 251                 if (targets >= targets_alloc) {
 252                         targets_alloc = targets_alloc ? targets_alloc * 2 : 64;
 253                         REALLOC_ARRAY(*target, targets_alloc);
 254                         REALLOC_ARRAY(*write_ref, targets_alloc);
 255                 }
 256                 (*target)[targets] = xstrdup(tg_one);
 257                 (*write_ref)[targets] = xstrdup_or_null(rf_one);
 258                 targets++;
 259         }
 260         strbuf_release(&buf);
 261         return targets;
 262 }
 263
 264 void walker_targets_free(int targets, char **target, const char **write_ref)
 265 {
 266         while (targets--) {
 267                 free(target[targets]);
 268                 if (write_ref)
 269                         free((char *) write_ref[targets]);
 270         }
 271 }
 272
 273 int walker_fetch(struct walker *walker, int targets, char **target,
 274                  const char **write_ref, const char *write_ref_log_details)
 275 {
 276         struct strbuf refname = STRBUF_INIT;
 277         struct strbuf err = STRBUF_INIT;
 278         struct ref_transaction *transaction = NULL;
 279         struct object_id *oids;
 280         char *msg = NULL;
 281         int i, ret = -1;
 282
 283         save_commit_buffer = 0;
 284
 285         ALLOC_ARRAY(oids, targets);
 286
 287         if (write_ref) {
 288                 transaction = ref_transaction_begin(&err);
 289                 if (!transaction) {
 290                         error("%s", err.buf);
 291                         goto done;
 292                 }
 293         }
 294
 295         if (!walker->get_recover) {
 296                 for_each_ref(mark_complete, NULL);
 297                 commit_list_sort_by_date(&complete);
 298         }
 299
 300         for (i = 0; i < targets; i++) {
 301                 if (interpret_target(walker, target[i], oids + i)) {
 302                         error("Could not interpret response from server '%s' as something to pull", target[i]);
 303                         goto done;
 304                 }
 305                 if (process(walker, lookup_unknown_object(the_repository, &oids[i])))
 306                         goto done;
 307         }
 308
 309         if (loop(walker))
 310                 goto done;
 311         if (!write_ref) {
 312                 ret = 0;
 313                 goto done;
 314         }
 315         if (write_ref_log_details) {
 316                 msg = xstrfmt("fetch from %s", write_ref_log_details);
 317         } else {
 318                 msg = NULL;
 319         }
 320         for (i = 0; i < targets; i++) {
 321                 if (!write_ref[i])
 322                         continue;
 323                 strbuf_reset(&refname);
 324                 strbuf_addf(&refname, "refs/%s", write_ref[i]);
 325                 if (ref_transaction_update(transaction, refname.buf,
 326                                            oids + i, NULL, 0,
 327                                            msg ? msg : "fetch (unknown)",
 328                                            &err)) {
 329                         error("%s", err.buf);
 330                         goto done;
 331                 }
 332         }
 333         if (ref_transaction_commit(transaction, &err)) {
 334                 error("%s", err.buf);
 335                 goto done;
 336         }
 337
 338         ret = 0;
 339
 340 done:
 341         ref_transaction_free(transaction);
 342         free(msg);
 343         free(oids);
 344         strbuf_release(&err);
 345         strbuf_release(&refname);
 346         return ret;
 347 }
 348
 349 void walker_free(struct walker *walker)
 350 {
 351         walker->cleanup(walker);
 352         free(walker);
 353 }