Andrew's git / gitweb.git / fetch.c
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fetch.con commit remote.c: "git-push frotz" should update what matches at the source. (1ed10b8)
   1#include "cache.h"
   2#include "fetch.h"
   3#include "commit.h"
   4#include "tree.h"
   5#include "tree-walk.h"
   6#include "tag.h"
   7#include "blob.h"
   8#include "refs.h"
   9#include "strbuf.h"
  10
  11int get_tree = 0;
  12int get_history = 0;
  13int get_all = 0;
  14int get_verbosely = 0;
  15int get_recover = 0;
  16static unsigned char current_commit_sha1[20];
  17
  18void pull_say(const char *fmt, const char *hex)
  19{
  20        if (get_verbosely)
  21                fprintf(stderr, fmt, hex);
  22}
  23
  24static void report_missing(const struct object *obj)
  25{
  26        char missing_hex[41];
  27        strcpy(missing_hex, sha1_to_hex(obj->sha1));;
  28        fprintf(stderr, "Cannot obtain needed %s %s\n",
  29                obj->type ? typename(obj->type): "object", missing_hex);
  30        if (!is_null_sha1(current_commit_sha1))
  31                fprintf(stderr, "while processing commit %s.\n",
  32                        sha1_to_hex(current_commit_sha1));
  33}
  34
  35static int process(struct object *obj);
  36
  37static 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        init_tree_desc(&desc, tree->buffer, tree->size);
  46        while (tree_entry(&desc, &entry)) {
  47                struct object *obj = NULL;
  48
  49                if (S_ISDIR(entry.mode)) {
  50                        struct tree *tree = lookup_tree(entry.sha1);
  51                        if (tree)
  52                                obj = &tree->object;
  53                }
  54                else {
  55                        struct blob *blob = lookup_blob(entry.sha1);
  56                        if (blob)
  57                                obj = &blob->object;
  58                }
  59                if (!obj || process(obj))
  60                        return -1;
  61        }
  62        free(tree->buffer);
  63        tree->buffer = NULL;
  64        tree->size = 0;
  65        return 0;
  66}
  67
  68#define COMPLETE        (1U << 0)
  69#define SEEN            (1U << 1)
  70#define TO_SCAN         (1U << 2)
  71
  72static struct commit_list *complete = NULL;
  73
  74static int process_commit(struct commit *commit)
  75{
  76        if (parse_commit(commit))
  77                return -1;
  78
  79        while (complete && complete->item->date >= commit->date) {
  80                pop_most_recent_commit(&complete, COMPLETE);
  81        }
  82
  83        if (commit->object.flags & COMPLETE)
  84                return 0;
  85
  86        hashcpy(current_commit_sha1, commit->object.sha1);
  87
  88        pull_say("walk %s\n", sha1_to_hex(commit->object.sha1));
  89
  90        if (get_tree) {
  91                if (process(&commit->tree->object))
  92                        return -1;
  93                if (!get_all)
  94                        get_tree = 0;
  95        }
  96        if (get_history) {
  97                struct commit_list *parents = commit->parents;
  98                for (; parents; parents = parents->next) {
  99                        if (process(&parents->item->object))
 100                                return -1;
 101                }
 102        }
 103        return 0;
 104}
 105
 106static int process_tag(struct tag *tag)
 107{
 108        if (parse_tag(tag))
 109                return -1;
 110        return process(tag->tagged);
 111}
 112
 113static struct object_list *process_queue = NULL;
 114static struct object_list **process_queue_end = &process_queue;
 115
 116static int process_object(struct object *obj)
 117{
 118        if (obj->type == OBJ_COMMIT) {
 119                if (process_commit((struct commit *)obj))
 120                        return -1;
 121                return 0;
 122        }
 123        if (obj->type == OBJ_TREE) {
 124                if (process_tree((struct tree *)obj))
 125                        return -1;
 126                return 0;
 127        }
 128        if (obj->type == OBJ_BLOB) {
 129                return 0;
 130        }
 131        if (obj->type == OBJ_TAG) {
 132                if (process_tag((struct tag *)obj))
 133                        return -1;
 134                return 0;
 135        }
 136        return error("Unable to determine requirements "
 137                     "of type %s for %s",
 138                     typename(obj->type), sha1_to_hex(obj->sha1));
 139}
 140
 141static int process(struct object *obj)
 142{
 143        if (obj->flags & SEEN)
 144                return 0;
 145        obj->flags |= SEEN;
 146
 147        if (has_sha1_file(obj->sha1)) {
 148                /* We already have it, so we should scan it now. */
 149                obj->flags |= TO_SCAN;
 150        }
 151        else {
 152                if (obj->flags & COMPLETE)
 153                        return 0;
 154                prefetch(obj->sha1);
 155        }
 156
 157        object_list_insert(obj, process_queue_end);
 158        process_queue_end = &(*process_queue_end)->next;
 159        return 0;
 160}
 161
 162static int loop(void)
 163{
 164        struct object_list *elem;
 165
 166        while (process_queue) {
 167                struct object *obj = process_queue->item;
 168                elem = process_queue;
 169                process_queue = elem->next;
 170                free(elem);
 171                if (!process_queue)
 172                        process_queue_end = &process_queue;
 173
 174                /* If we are not scanning this object, we placed it in
 175                 * the queue because we needed to fetch it first.
 176                 */
 177                if (! (obj->flags & TO_SCAN)) {
 178                        if (fetch(obj->sha1)) {
 179                                report_missing(obj);
 180                                return -1;
 181                        }
 182                }
 183                if (!obj->type)
 184                        parse_object(obj->sha1);
 185                if (process_object(obj))
 186                        return -1;
 187        }
 188        return 0;
 189}
 190
 191static int interpret_target(char *target, unsigned char *sha1)
 192{
 193        if (!get_sha1_hex(target, sha1))
 194                return 0;
 195        if (!check_ref_format(target)) {
 196                if (!fetch_ref(target, sha1)) {
 197                        return 0;
 198                }
 199        }
 200        return -1;
 201}
 202
 203static int mark_complete(const char *path, const unsigned char *sha1, int flag, void *cb_data)
 204{
 205        struct commit *commit = lookup_commit_reference_gently(sha1, 1);
 206        if (commit) {
 207                commit->object.flags |= COMPLETE;
 208                insert_by_date(commit, &complete);
 209        }
 210        return 0;
 211}
 212
 213int pull_targets_stdin(char ***target, const char ***write_ref)
 214{
 215        int targets = 0, targets_alloc = 0;
 216        struct strbuf buf;
 217        *target = NULL; *write_ref = NULL;
 218        strbuf_init(&buf);
 219        while (1) {
 220                char *rf_one = NULL;
 221                char *tg_one;
 222
 223                read_line(&buf, stdin, '\n');
 224                if (buf.eof)
 225                        break;
 226                tg_one = buf.buf;
 227                rf_one = strchr(tg_one, '\t');
 228                if (rf_one)
 229                        *rf_one++ = 0;
 230
 231                if (targets >= targets_alloc) {
 232                        targets_alloc = targets_alloc ? targets_alloc * 2 : 64;
 233                        *target = xrealloc(*target, targets_alloc * sizeof(**target));
 234                        *write_ref = xrealloc(*write_ref, targets_alloc * sizeof(**write_ref));
 235                }
 236                (*target)[targets] = xstrdup(tg_one);
 237                (*write_ref)[targets] = rf_one ? xstrdup(rf_one) : NULL;
 238                targets++;
 239        }
 240        return targets;
 241}
 242
 243void pull_targets_free(int targets, char **target, const char **write_ref)
 244{
 245        while (targets--) {
 246                free(target[targets]);
 247                if (write_ref && write_ref[targets])
 248                        free((char *) write_ref[targets]);
 249        }
 250}
 251
 252int pull(int targets, char **target, const char **write_ref,
 253         const char *write_ref_log_details)
 254{
 255        struct ref_lock **lock = xcalloc(targets, sizeof(struct ref_lock *));
 256        unsigned char *sha1 = xmalloc(targets * 20);
 257        char *msg;
 258        int ret;
 259        int i;
 260
 261        save_commit_buffer = 0;
 262        track_object_refs = 0;
 263
 264        for (i = 0; i < targets; i++) {
 265                if (!write_ref || !write_ref[i])
 266                        continue;
 267
 268                lock[i] = lock_ref_sha1(write_ref[i], NULL);
 269                if (!lock[i]) {
 270                        error("Can't lock ref %s", write_ref[i]);
 271                        goto unlock_and_fail;
 272                }
 273        }
 274
 275        if (!get_recover)
 276                for_each_ref(mark_complete, NULL);
 277
 278        for (i = 0; i < targets; i++) {
 279                if (interpret_target(target[i], &sha1[20 * i])) {
 280                        error("Could not interpret %s as something to pull", target[i]);
 281                        goto unlock_and_fail;
 282                }
 283                if (process(lookup_unknown_object(&sha1[20 * i])))
 284                        goto unlock_and_fail;
 285        }
 286
 287        if (loop())
 288                goto unlock_and_fail;
 289
 290        if (write_ref_log_details) {
 291                msg = xmalloc(strlen(write_ref_log_details) + 12);
 292                sprintf(msg, "fetch from %s", write_ref_log_details);
 293        } else {
 294                msg = NULL;
 295        }
 296        for (i = 0; i < targets; i++) {
 297                if (!write_ref || !write_ref[i])
 298                        continue;
 299                ret = write_ref_sha1(lock[i], &sha1[20 * i], msg ? msg : "fetch (unknown)");
 300                lock[i] = NULL;
 301                if (ret)
 302                        goto unlock_and_fail;
 303        }
 304        free(msg);
 305
 306        return 0;
 307
 308
 309unlock_and_fail:
 310        for (i = 0; i < targets; i++)
 311                if (lock[i])
 312                        unlock_ref(lock[i]);
 313        return -1;
 314}