fetch.c

   1 #include "fetch.h"
   2
   3 #include "cache.h"
   4 #include "commit.h"
   5 #include "tree.h"
   6 #include "tree-walk.h"
   7 #include "tag.h"
   8 #include "blob.h"
   9 #include "refs.h"
  10 #include "strbuf.h"
  11
  12 int get_tree = 0;
  13 int get_history = 0;
  14 int get_all = 0;
  15 int get_verbosely = 0;
  16 int get_recover = 0;
  17 static unsigned char current_commit_sha1[20];
  18
  19 void pull_say(const char *fmt, const char *hex)
  20 {
  21         if (get_verbosely)
  22                 fprintf(stderr, fmt, hex);
  23 }
  24
  25 static void report_missing(const struct object *obj)
  26 {
  27         char missing_hex[41];
  28         strcpy(missing_hex, sha1_to_hex(obj->sha1));;
  29         fprintf(stderr, "Cannot obtain needed %s %s\n",
  30                 obj->type ? typename(obj->type): "object", missing_hex);
  31         if (!is_null_sha1(current_commit_sha1))
  32                 fprintf(stderr, "while processing commit %s.\n",
  33                         sha1_to_hex(current_commit_sha1));
  34 }
  35
  36 static int process(struct object *obj);
  37
  38 static int process_tree(struct tree *tree)
  39 {
  40         struct tree_desc desc;
  41         struct name_entry entry;
  42
  43         if (parse_tree(tree))
  44                 return -1;
  45
  46         desc.buf = tree->buffer;
  47         desc.size = tree->size;
  48         while (tree_entry(&desc, &entry)) {
  49                 struct object *obj = NULL;
  50
  51                 if (S_ISDIR(entry.mode)) {
  52                         struct tree *tree = lookup_tree(entry.sha1);
  53                         if (tree)
  54                                 obj = &tree->object;
  55                 }
  56                 else {
  57                         struct blob *blob = lookup_blob(entry.sha1);
  58                         if (blob)
  59                                 obj = &blob->object;
  60                 }
  61                 if (!obj || process(obj))
  62                         return -1;
  63         }
  64         free(tree->buffer);
  65         tree->buffer = NULL;
  66         tree->size = 0;
  67         return 0;
  68 }
  69
  70 #define COMPLETE        (1U << 0)
  71 #define SEEN            (1U << 1)
  72 #define TO_SCAN         (1U << 2)
  73
  74 static struct commit_list *complete = NULL;
  75
  76 static int process_commit(struct commit *commit)
  77 {
  78         if (parse_commit(commit))
  79                 return -1;
  80
  81         while (complete && complete->item->date >= commit->date) {
  82                 pop_most_recent_commit(&complete, COMPLETE);
  83         }
  84
  85         if (commit->object.flags & COMPLETE)
  86                 return 0;
  87
  88         hashcpy(current_commit_sha1, commit->object.sha1);
  89
  90         pull_say("walk %s\n", sha1_to_hex(commit->object.sha1));
  91
  92         if (get_tree) {
  93                 if (process(&commit->tree->object))
  94                         return -1;
  95                 if (!get_all)
  96                         get_tree = 0;
  97         }
  98         if (get_history) {
  99                 struct commit_list *parents = commit->parents;
 100                 for (; parents; parents = parents->next) {
 101                         if (process(&parents->item->object))
 102                                 return -1;
 103                 }
 104         }
 105         return 0;
 106 }
 107
 108 static int process_tag(struct tag *tag)
 109 {
 110         if (parse_tag(tag))
 111                 return -1;
 112         return process(tag->tagged);
 113 }
 114
 115 static struct object_list *process_queue = NULL;
 116 static struct object_list **process_queue_end = &process_queue;
 117
 118 static int process_object(struct object *obj)
 119 {
 120         if (obj->type == OBJ_COMMIT) {
 121                 if (process_commit((struct commit *)obj))
 122                         return -1;
 123                 return 0;
 124         }
 125         if (obj->type == OBJ_TREE) {
 126                 if (process_tree((struct tree *)obj))
 127                         return -1;
 128                 return 0;
 129         }
 130         if (obj->type == OBJ_BLOB) {
 131                 return 0;
 132         }
 133         if (obj->type == OBJ_TAG) {
 134                 if (process_tag((struct tag *)obj))
 135                         return -1;
 136                 return 0;
 137         }
 138         return error("Unable to determine requirements "
 139                      "of type %s for %s",
 140                      typename(obj->type), sha1_to_hex(obj->sha1));
 141 }
 142
 143 static int process(struct object *obj)
 144 {
 145         if (obj->flags & SEEN)
 146                 return 0;
 147         obj->flags |= SEEN;
 148
 149         if (has_sha1_file(obj->sha1)) {
 150                 /* We already have it, so we should scan it now. */
 151                 obj->flags |= TO_SCAN;
 152         }
 153         else {
 154                 if (obj->flags & COMPLETE)
 155                         return 0;
 156                 prefetch(obj->sha1);
 157         }
 158
 159         object_list_insert(obj, process_queue_end);
 160         process_queue_end = &(*process_queue_end)->next;
 161         return 0;
 162 }
 163
 164 static int loop(void)
 165 {
 166         struct object_list *elem;
 167
 168         while (process_queue) {
 169                 struct object *obj = process_queue->item;
 170                 elem = process_queue;
 171                 process_queue = elem->next;
 172                 free(elem);
 173                 if (!process_queue)
 174                         process_queue_end = &process_queue;
 175
 176                 /* If we are not scanning this object, we placed it in
 177                  * the queue because we needed to fetch it first.
 178                  */
 179                 if (! (obj->flags & TO_SCAN)) {
 180                         if (fetch(obj->sha1)) {
 181                                 report_missing(obj);
 182                                 return -1;
 183                         }
 184                 }
 185                 if (!obj->type)
 186                         parse_object(obj->sha1);
 187                 if (process_object(obj))
 188                         return -1;
 189         }
 190         return 0;
 191 }
 192
 193 static int interpret_target(char *target, unsigned char *sha1)
 194 {
 195         if (!get_sha1_hex(target, sha1))
 196                 return 0;
 197         if (!check_ref_format(target)) {
 198                 if (!fetch_ref(target, sha1)) {
 199                         return 0;
 200                 }
 201         }
 202         return -1;
 203 }
 204
 205 static int mark_complete(const char *path, const unsigned char *sha1, int flag, void *cb_data)
 206 {
 207         struct commit *commit = lookup_commit_reference_gently(sha1, 1);
 208         if (commit) {
 209                 commit->object.flags |= COMPLETE;
 210                 insert_by_date(commit, &complete);
 211         }
 212         return 0;
 213 }
 214
 215 int pull_targets_stdin(char ***target, const char ***write_ref)
 216 {
 217         int targets = 0, targets_alloc = 0;
 218         struct strbuf buf;
 219         *target = NULL; *write_ref = NULL;
 220         strbuf_init(&buf);
 221         while (1) {
 222                 char *rf_one = NULL;
 223                 char *tg_one;
 224
 225                 read_line(&buf, stdin, '\n');
 226                 if (buf.eof)
 227                         break;
 228                 tg_one = buf.buf;
 229                 rf_one = strchr(tg_one, '\t');
 230                 if (rf_one)
 231                         *rf_one++ = 0;
 232
 233                 if (targets >= targets_alloc) {
 234                         targets_alloc = targets_alloc ? targets_alloc * 2 : 64;
 235                         *target = xrealloc(*target, targets_alloc * sizeof(**target));
 236                         *write_ref = xrealloc(*write_ref, targets_alloc * sizeof(**write_ref));
 237                 }
 238                 (*target)[targets] = xstrdup(tg_one);
 239                 (*write_ref)[targets] = rf_one ? xstrdup(rf_one) : NULL;
 240                 targets++;
 241         }
 242         return targets;
 243 }
 244
 245 void pull_targets_free(int targets, char **target, const char **write_ref)
 246 {
 247         while (targets--) {
 248                 free(target[targets]);
 249                 if (write_ref && write_ref[targets])
 250                         free((char *) write_ref[targets]);
 251         }
 252 }
 253
 254 int pull(int targets, char **target, const char **write_ref,
 255          const char *write_ref_log_details)
 256 {
 257         struct ref_lock **lock = xcalloc(targets, sizeof(struct ref_lock *));
 258         unsigned char *sha1 = xmalloc(targets * 20);
 259         char *msg;
 260         int ret;
 261         int i;
 262
 263         save_commit_buffer = 0;
 264         track_object_refs = 0;
 265
 266         for (i = 0; i < targets; i++) {
 267                 if (!write_ref || !write_ref[i])
 268                         continue;
 269
 270                 lock[i] = lock_ref_sha1(write_ref[i], NULL);
 271                 if (!lock[i]) {
 272                         error("Can't lock ref %s", write_ref[i]);
 273                         goto unlock_and_fail;
 274                 }
 275         }
 276
 277         if (!get_recover)
 278                 for_each_ref(mark_complete, NULL);
 279
 280         for (i = 0; i < targets; i++) {
 281                 if (interpret_target(target[i], &sha1[20 * i])) {
 282                         error("Could not interpret %s as something to pull", target[i]);
 283                         goto unlock_and_fail;
 284                 }
 285                 if (process(lookup_unknown_object(&sha1[20 * i])))
 286                         goto unlock_and_fail;
 287         }
 288
 289         if (loop())
 290                 goto unlock_and_fail;
 291
 292         if (write_ref_log_details) {
 293                 msg = xmalloc(strlen(write_ref_log_details) + 12);
 294                 sprintf(msg, "fetch from %s", write_ref_log_details);
 295         } else {
 296                 msg = NULL;
 297         }
 298         for (i = 0; i < targets; i++) {
 299                 if (!write_ref || !write_ref[i])
 300                         continue;
 301                 ret = write_ref_sha1(lock[i], &sha1[20 * i], msg ? msg : "fetch (unknown)");
 302                 lock[i] = NULL;
 303                 if (ret)
 304                         goto unlock_and_fail;
 305         }
 306         free(msg);
 307
 308         return 0;
 309
 310
 311 unlock_and_fail:
 312         for (i = 0; i < targets; i++)
 313                 if (lock[i])
 314                         unlock_ref(lock[i]);
 315         return -1;
 316 }