Andrew's git - gitweb.git/blob

   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
  12int get_tree = 0;
  13int get_history = 0;
  14int get_all = 0;
  15int get_verbosely = 0;
  16int get_recover = 0;
  17static unsigned char current_commit_sha1[20];
  18
  19void pull_say(const char *fmt, const char *hex) 
  20{
  21        if (get_verbosely)
  22                fprintf(stderr, fmt, hex);
  23}
  24
  25static 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
  36static int process(struct object *obj);
  37
  38static 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
  74static struct commit_list *complete = NULL;
  75
  76static 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
 108static int process_tag(struct tag *tag)
 109{
 110        if (parse_tag(tag))
 111                return -1;
 112        return process(tag->tagged);
 113}
 114
 115static struct object_list *process_queue = NULL;
 116static struct object_list **process_queue_end = &process_queue;
 117
 118static 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
 143static 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
 164static 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
 193static 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
 205static 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
 215int 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
 245void 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
 254int 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
 311unlock_and_fail:
 312        for (i = 0; i < targets; i++)
 313                if (lock[i])
 314                        unlock_ref(lock[i]);
 315        return -1;
 316}