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