Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2#include "walker.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
  10static unsigned char current_commit_sha1[20];
  11
  12void walker_say(struct walker *walker, const char *fmt, const char *hex)
  13{
  14        if (walker->get_verbosely)
  15                fprintf(stderr, fmt, hex);
  16}
  17
  18static void report_missing(const struct object *obj)
  19{
  20        char missing_hex[41];
  21        strcpy(missing_hex, sha1_to_hex(obj->sha1));
  22        fprintf(stderr, "Cannot obtain needed %s %s\n",
  23                obj->type ? typename(obj->type): "object", missing_hex);
  24        if (!is_null_sha1(current_commit_sha1))
  25                fprintf(stderr, "while processing commit %s.\n",
  26                        sha1_to_hex(current_commit_sha1));
  27}
  28
  29static int process(struct walker *walker, struct object *obj);
  30
  31static int process_tree(struct walker *walker, struct tree *tree)
  32{
  33        struct tree_desc desc;
  34        struct name_entry entry;
  35
  36        if (parse_tree(tree))
  37                return -1;
  38
  39        init_tree_desc(&desc, tree->buffer, tree->size);
  40        while (tree_entry(&desc, &entry)) {
  41                struct object *obj = NULL;
  42
  43                /* submodule commits are not stored in the superproject */
  44                if (S_ISGITLINK(entry.mode))
  45                        continue;
  46                if (S_ISDIR(entry.mode)) {
  47                        struct tree *tree = lookup_tree(entry.sha1);
  48                        if (tree)
  49                                obj = &tree->object;
  50                }
  51                else {
  52                        struct blob *blob = lookup_blob(entry.sha1);
  53                        if (blob)
  54                                obj = &blob->object;
  55                }
  56                if (!obj || process(walker, obj))
  57                        return -1;
  58        }
  59        free_tree_buffer(tree);
  60        return 0;
  61}
  62
  63#define COMPLETE        (1U << 0)
  64#define SEEN            (1U << 1)
  65#define TO_SCAN         (1U << 2)
  66
  67static struct commit_list *complete = NULL;
  68
  69static int process_commit(struct walker *walker, struct commit *commit)
  70{
  71        if (parse_commit(commit))
  72                return -1;
  73
  74        while (complete && complete->item->date >= commit->date) {
  75                pop_most_recent_commit(&complete, COMPLETE);
  76        }
  77
  78        if (commit->object.flags & COMPLETE)
  79                return 0;
  80
  81        hashcpy(current_commit_sha1, commit->object.sha1);
  82
  83        walker_say(walker, "walk %s\n", sha1_to_hex(commit->object.sha1));
  84
  85        if (walker->get_tree) {
  86                if (process(walker, &commit->tree->object))
  87                        return -1;
  88                if (!walker->get_all)
  89                        walker->get_tree = 0;
  90        }
  91        if (walker->get_history) {
  92                struct commit_list *parents = commit->parents;
  93                for (; parents; parents = parents->next) {
  94                        if (process(walker, &parents->item->object))
  95                                return -1;
  96                }
  97        }
  98        return 0;
  99}
 100
 101static int process_tag(struct walker *walker, struct tag *tag)
 102{
 103        if (parse_tag(tag))
 104                return -1;
 105        return process(walker, tag->tagged);
 106}
 107
 108static struct object_list *process_queue = NULL;
 109static struct object_list **process_queue_end = &process_queue;
 110
 111static int process_object(struct walker *walker, struct object *obj)
 112{
 113        if (obj->type == OBJ_COMMIT) {
 114                if (process_commit(walker, (struct commit *)obj))
 115                        return -1;
 116                return 0;
 117        }
 118        if (obj->type == OBJ_TREE) {
 119                if (process_tree(walker, (struct tree *)obj))
 120                        return -1;
 121                return 0;
 122        }
 123        if (obj->type == OBJ_BLOB) {
 124                return 0;
 125        }
 126        if (obj->type == OBJ_TAG) {
 127                if (process_tag(walker, (struct tag *)obj))
 128                        return -1;
 129                return 0;
 130        }
 131        return error("Unable to determine requirements "
 132                     "of type %s for %s",
 133                     typename(obj->type), sha1_to_hex(obj->sha1));
 134}
 135
 136static int process(struct walker *walker, struct object *obj)
 137{
 138        if (obj->flags & SEEN)
 139                return 0;
 140        obj->flags |= SEEN;
 141
 142        if (has_sha1_file(obj->sha1)) {
 143                /* We already have it, so we should scan it now. */
 144                obj->flags |= TO_SCAN;
 145        }
 146        else {
 147                if (obj->flags & COMPLETE)
 148                        return 0;
 149                walker->prefetch(walker, obj->sha1);
 150        }
 151
 152        object_list_insert(obj, process_queue_end);
 153        process_queue_end = &(*process_queue_end)->next;
 154        return 0;
 155}
 156
 157static int loop(struct walker *walker)
 158{
 159        struct object_list *elem;
 160
 161        while (process_queue) {
 162                struct object *obj = process_queue->item;
 163                elem = process_queue;
 164                process_queue = elem->next;
 165                free(elem);
 166                if (!process_queue)
 167                        process_queue_end = &process_queue;
 168
 169                /* If we are not scanning this object, we placed it in
 170                 * the queue because we needed to fetch it first.
 171                 */
 172                if (! (obj->flags & TO_SCAN)) {
 173                        if (walker->fetch(walker, obj->sha1)) {
 174                                report_missing(obj);
 175                                return -1;
 176                        }
 177                }
 178                if (!obj->type)
 179                        parse_object(obj->sha1);
 180                if (process_object(walker, obj))
 181                        return -1;
 182        }
 183        return 0;
 184}
 185
 186static int interpret_target(struct walker *walker, char *target, unsigned char *sha1)
 187{
 188        if (!get_sha1_hex(target, sha1))
 189                return 0;
 190        if (!check_refname_format(target, 0)) {
 191                struct ref *ref = alloc_ref(target);
 192                if (!walker->fetch_ref(walker, ref)) {
 193                        hashcpy(sha1, ref->old_sha1);
 194                        free(ref);
 195                        return 0;
 196                }
 197                free(ref);
 198        }
 199        return -1;
 200}
 201
 202static int mark_complete(const char *path, const unsigned char *sha1, int flag, void *cb_data)
 203{
 204        struct commit *commit = lookup_commit_reference_gently(sha1, 1);
 205        if (commit) {
 206                commit->object.flags |= COMPLETE;
 207                commit_list_insert_by_date(commit, &complete);
 208        }
 209        return 0;
 210}
 211
 212int walker_targets_stdin(char ***target, const char ***write_ref)
 213{
 214        int targets = 0, targets_alloc = 0;
 215        struct strbuf buf = STRBUF_INIT;
 216        *target = NULL; *write_ref = NULL;
 217        while (1) {
 218                char *rf_one = NULL;
 219                char *tg_one;
 220
 221                if (strbuf_getline(&buf, stdin, '\n') == EOF)
 222                        break;
 223                tg_one = buf.buf;
 224                rf_one = strchr(tg_one, '\t');
 225                if (rf_one)
 226                        *rf_one++ = 0;
 227
 228                if (targets >= targets_alloc) {
 229                        targets_alloc = targets_alloc ? targets_alloc * 2 : 64;
 230                        *target = xrealloc(*target, targets_alloc * sizeof(**target));
 231                        *write_ref = xrealloc(*write_ref, targets_alloc * sizeof(**write_ref));
 232                }
 233                (*target)[targets] = xstrdup(tg_one);
 234                (*write_ref)[targets] = rf_one ? xstrdup(rf_one) : NULL;
 235                targets++;
 236        }
 237        strbuf_release(&buf);
 238        return targets;
 239}
 240
 241void walker_targets_free(int targets, char **target, const char **write_ref)
 242{
 243        while (targets--) {
 244                free(target[targets]);
 245                if (write_ref)
 246                        free((char *) write_ref[targets]);
 247        }
 248}
 249
 250int walker_fetch(struct walker *walker, int targets, char **target,
 251                 const char **write_ref, const char *write_ref_log_details)
 252{
 253        struct ref_lock **lock = xcalloc(targets, sizeof(struct ref_lock *));
 254        unsigned char *sha1 = xmalloc(targets * 20);
 255        char *msg;
 256        int ret;
 257        int i;
 258
 259        save_commit_buffer = 0;
 260
 261        for (i = 0; i < targets; i++) {
 262                if (!write_ref || !write_ref[i])
 263                        continue;
 264
 265                lock[i] = lock_ref_sha1(write_ref[i], NULL);
 266                if (!lock[i]) {
 267                        error("Can't lock ref %s", write_ref[i]);
 268                        goto unlock_and_fail;
 269                }
 270        }
 271
 272        if (!walker->get_recover)
 273                for_each_ref(mark_complete, NULL);
 274
 275        for (i = 0; i < targets; i++) {
 276                if (interpret_target(walker, target[i], &sha1[20 * i])) {
 277                        error("Could not interpret response from server '%s' as something to pull", target[i]);
 278                        goto unlock_and_fail;
 279                }
 280                if (process(walker, lookup_unknown_object(&sha1[20 * i])))
 281                        goto unlock_and_fail;
 282        }
 283
 284        if (loop(walker))
 285                goto unlock_and_fail;
 286
 287        if (write_ref_log_details) {
 288                msg = xmalloc(strlen(write_ref_log_details) + 12);
 289                sprintf(msg, "fetch from %s", write_ref_log_details);
 290        } else {
 291                msg = NULL;
 292        }
 293        for (i = 0; i < targets; i++) {
 294                if (!write_ref || !write_ref[i])
 295                        continue;
 296                ret = write_ref_sha1(lock[i], &sha1[20 * i], msg ? msg : "fetch (unknown)");
 297                lock[i] = NULL;
 298                if (ret)
 299                        goto unlock_and_fail;
 300        }
 301        free(msg);
 302
 303        return 0;
 304
 305unlock_and_fail:
 306        for (i = 0; i < targets; i++)
 307                if (lock[i])
 308                        unlock_ref(lock[i]);
 309
 310        return -1;
 311}
 312
 313void walker_free(struct walker *walker)
 314{
 315        walker->cleanup(walker);
 316        free(walker);
 317}