walker.c

   1 #define USE_THE_REPOSITORY_VARIABLE
   2
   3 #include "git-compat-util.h"
   4 #include "gettext.h"
   5 #include "hex.h"
   6 #include "walker.h"
   7 #include "repository.h"
   8 #include "object-store-ll.h"
   9 #include "commit.h"
  10 #include "strbuf.h"
  11 #include "tree.h"
  12 #include "tree-walk.h"
  13 #include "tag.h"
  14 #include "blob.h"
  15 #include "refs.h"
  16 #include "progress.h"
  17
  18 static struct object_id current_commit_oid;
  19
  20 void walker_say(struct walker *walker, const char *fmt, ...)
  21 {
  22         if (walker->get_verbosely) {
  23                 va_list ap;
  24                 va_start(ap, fmt);
  25                 vfprintf(stderr, fmt, ap);
  26                 va_end(ap);
  27         }
  28 }
  29
  30 static void report_missing(const struct object *obj)
  31 {
  32         fprintf(stderr, "Cannot obtain needed %s %s\n",
  33                 obj->type ? type_name(obj->type): "object",
  34                 oid_to_hex(&obj->oid));
  35         if (!is_null_oid(&current_commit_oid))
  36                 fprintf(stderr, "while processing commit %s.\n",
  37                         oid_to_hex(&current_commit_oid));
  38 }
  39
  40 static int process(struct walker *walker, struct object *obj);
  41
  42 static int process_tree(struct walker *walker, struct tree *tree)
  43 {
  44         struct tree_desc desc;
  45         struct name_entry entry;
  46
  47         if (parse_tree(tree))
  48                 return -1;
  49
  50         init_tree_desc(&desc, &tree->object.oid, tree->buffer, tree->size);
  51         while (tree_entry(&desc, &entry)) {
  52                 struct object *obj = NULL;
  53
  54                 /* submodule commits are not stored in the superproject */
  55                 if (S_ISGITLINK(entry.mode))
  56                         continue;
  57                 if (S_ISDIR(entry.mode)) {
  58                         struct tree *tree = lookup_tree(the_repository,
  59                                                         &entry.oid);
  60                         if (tree)
  61                                 obj = &tree->object;
  62                 }
  63                 else {
  64                         struct blob *blob = lookup_blob(the_repository,
  65                                                         &entry.oid);
  66                         if (blob)
  67                                 obj = &blob->object;
  68                 }
  69                 if (!obj || process(walker, obj))
  70                         return -1;
  71         }
  72         free_tree_buffer(tree);
  73         return 0;
  74 }
  75
  76 /* Remember to update object flag allocation in object.h */
  77 #define COMPLETE        (1U << 0)
  78 #define SEEN            (1U << 1)
  79 #define TO_SCAN         (1U << 2)
  80
  81 static struct commit_list *complete = NULL;
  82
  83 static int process_commit(struct walker *walker, struct commit *commit)
  84 {
  85         struct commit_list *parents;
  86
  87         if (repo_parse_commit(the_repository, commit))
  88                 return -1;
  89
  90         while (complete && complete->item->date >= commit->date) {
  91                 pop_most_recent_commit(&complete, COMPLETE);
  92         }
  93
  94         if (commit->object.flags & COMPLETE)
  95                 return 0;
  96
  97         oidcpy(&current_commit_oid, &commit->object.oid);
  98
  99         walker_say(walker, "walk %s\n", oid_to_hex(&commit->object.oid));
 100
 101         if (process(walker, &repo_get_commit_tree(the_repository, commit)->object))
 102                 return -1;
 103
 104         for (parents = commit->parents; parents; parents = parents->next) {
 105                 if (process(walker, &parents->item->object))
 106                         return -1;
 107         }
 108
 109         return 0;
 110 }
 111
 112 static int process_tag(struct walker *walker, struct tag *tag)
 113 {
 114         if (parse_tag(tag))
 115                 return -1;
 116         return process(walker, tag->tagged);
 117 }
 118
 119 static struct object_list *process_queue = NULL;
 120 static struct object_list **process_queue_end = &process_queue;
 121
 122 static int process_object(struct walker *walker, struct object *obj)
 123 {
 124         if (obj->type == OBJ_COMMIT) {
 125                 if (process_commit(walker, (struct commit *)obj))
 126                         return -1;
 127                 return 0;
 128         }
 129         if (obj->type == OBJ_TREE) {
 130                 if (process_tree(walker, (struct tree *)obj))
 131                         return -1;
 132                 return 0;
 133         }
 134         if (obj->type == OBJ_BLOB) {
 135                 return 0;
 136         }
 137         if (obj->type == OBJ_TAG) {
 138                 if (process_tag(walker, (struct tag *)obj))
 139                         return -1;
 140                 return 0;
 141         }
 142         return error("Unable to determine requirements "
 143                      "of type %s for %s",
 144                      type_name(obj->type), oid_to_hex(&obj->oid));
 145 }
 146
 147 static int process(struct walker *walker, struct object *obj)
 148 {
 149         if (obj->flags & SEEN)
 150                 return 0;
 151         obj->flags |= SEEN;
 152
 153         if (repo_has_object_file(the_repository, &obj->oid)) {
 154                 /* We already have it, so we should scan it now. */
 155                 obj->flags |= TO_SCAN;
 156         }
 157         else {
 158                 if (obj->flags & COMPLETE)
 159                         return 0;
 160                 walker->prefetch(walker, &obj->oid);
 161         }
 162
 163         object_list_insert(obj, process_queue_end);
 164         process_queue_end = &(*process_queue_end)->next;
 165         return 0;
 166 }
 167
 168 static int loop(struct walker *walker)
 169 {
 170         struct object_list *elem;
 171         struct progress *progress = NULL;
 172         uint64_t nr = 0;
 173
 174         if (walker->get_progress)
 175                 progress = start_delayed_progress(_("Fetching objects"), 0);
 176
 177         while (process_queue) {
 178                 struct object *obj = process_queue->item;
 179                 elem = process_queue;
 180                 process_queue = elem->next;
 181                 free(elem);
 182                 if (!process_queue)
 183                         process_queue_end = &process_queue;
 184
 185                 /* If we are not scanning this object, we placed it in
 186                  * the queue because we needed to fetch it first.
 187                  */
 188                 if (! (obj->flags & TO_SCAN)) {
 189                         if (walker->fetch(walker, &obj->oid)) {
 190                                 stop_progress(&progress);
 191                                 report_missing(obj);
 192                                 return -1;
 193                         }
 194                 }
 195                 if (!obj->type)
 196                         parse_object(the_repository, &obj->oid);
 197                 if (process_object(walker, obj)) {
 198                         stop_progress(&progress);
 199                         return -1;
 200                 }
 201                 display_progress(progress, ++nr);
 202         }
 203         stop_progress(&progress);
 204         return 0;
 205 }
 206
 207 static int interpret_target(struct walker *walker, char *target, struct object_id *oid)
 208 {
 209         if (!get_oid_hex(target, oid))
 210                 return 0;
 211         if (!check_refname_format(target, 0)) {
 212                 struct ref *ref = alloc_ref(target);
 213                 if (!walker->fetch_ref(walker, ref)) {
 214                         oidcpy(oid, &ref->old_oid);
 215                         free(ref);
 216                         return 0;
 217                 }
 218                 free(ref);
 219         }
 220         return -1;
 221 }
 222
 223 static int mark_complete(const char *path UNUSED,
 224                         const char *referent UNUSED,
 225                          const struct object_id *oid,
 226                          int flag UNUSED,
 227                          void *cb_data UNUSED)
 228 {
 229         struct commit *commit = lookup_commit_reference_gently(the_repository,
 230                                                                oid, 1);
 231
 232         if (commit) {
 233                 commit->object.flags |= COMPLETE;
 234                 commit_list_insert(commit, &complete);
 235         }
 236         return 0;
 237 }
 238
 239 int walker_targets_stdin(char ***target, const char ***write_ref)
 240 {
 241         int targets = 0, targets_alloc = 0;
 242         struct strbuf buf = STRBUF_INIT;
 243         *target = NULL; *write_ref = NULL;
 244         while (1) {
 245                 char *rf_one = NULL;
 246                 char *tg_one;
 247
 248                 if (strbuf_getline_lf(&buf, stdin) == EOF)
 249                         break;
 250                 tg_one = buf.buf;
 251                 rf_one = strchr(tg_one, '\t');
 252                 if (rf_one)
 253                         *rf_one++ = 0;
 254
 255                 if (targets >= targets_alloc) {
 256                         targets_alloc = targets_alloc ? targets_alloc * 2 : 64;
 257                         REALLOC_ARRAY(*target, targets_alloc);
 258                         REALLOC_ARRAY(*write_ref, targets_alloc);
 259                 }
 260                 (*target)[targets] = xstrdup(tg_one);
 261                 (*write_ref)[targets] = xstrdup_or_null(rf_one);
 262                 targets++;
 263         }
 264         strbuf_release(&buf);
 265         return targets;
 266 }
 267
 268 void walker_targets_free(int targets, char **target, const char **write_ref)
 269 {
 270         while (targets--) {
 271                 free(target[targets]);
 272                 if (write_ref)
 273                         free((char *) write_ref[targets]);
 274         }
 275 }
 276
 277 int walker_fetch(struct walker *walker, int targets, char **target,
 278                  const char **write_ref, const char *write_ref_log_details)
 279 {
 280         struct strbuf refname = STRBUF_INIT;
 281         struct strbuf err = STRBUF_INIT;
 282         struct ref_transaction *transaction = NULL;
 283         struct object_id *oids;
 284         char *msg = NULL;
 285         int i, ret = -1;
 286
 287         save_commit_buffer = 0;
 288
 289         ALLOC_ARRAY(oids, targets);
 290
 291         if (write_ref) {
 292                 transaction = ref_store_transaction_begin(get_main_ref_store(the_repository),
 293                                                           &err);
 294                 if (!transaction) {
 295                         error("%s", err.buf);
 296                         goto done;
 297                 }
 298         }
 299
 300         if (!walker->get_recover) {
 301                 refs_for_each_ref(get_main_ref_store(the_repository),
 302                                   mark_complete, NULL);
 303                 commit_list_sort_by_date(&complete);
 304         }
 305
 306         for (i = 0; i < targets; i++) {
 307                 if (interpret_target(walker, target[i], oids + i)) {
 308                         error("Could not interpret response from server '%s' as something to pull", target[i]);
 309                         goto done;
 310                 }
 311                 if (process(walker, lookup_unknown_object(the_repository, &oids[i])))
 312                         goto done;
 313         }
 314
 315         if (loop(walker))
 316                 goto done;
 317         if (!write_ref) {
 318                 ret = 0;
 319                 goto done;
 320         }
 321         if (write_ref_log_details) {
 322                 msg = xstrfmt("fetch from %s", write_ref_log_details);
 323         } else {
 324                 msg = NULL;
 325         }
 326         for (i = 0; i < targets; i++) {
 327                 if (!write_ref[i])
 328                         continue;
 329                 strbuf_reset(&refname);
 330                 strbuf_addf(&refname, "refs/%s", write_ref[i]);
 331                 if (ref_transaction_update(transaction, refname.buf,
 332                                            oids + i, NULL, NULL, NULL, 0,
 333                                            msg ? msg : "fetch (unknown)",
 334                                            &err)) {
 335                         error("%s", err.buf);
 336                         goto done;
 337                 }
 338         }
 339         if (ref_transaction_commit(transaction, &err)) {
 340                 error("%s", err.buf);
 341                 goto done;
 342         }
 343
 344         ret = 0;
 345
 346 done:
 347         ref_transaction_free(transaction);
 348         free(msg);
 349         free(oids);
 350         strbuf_release(&err);
 351         strbuf_release(&refname);
 352         return ret;
 353 }
 354
 355 void walker_free(struct walker *walker)
 356 {
 357         walker->cleanup(walker);
 358         free(walker);
 359 }