walker.c

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