Andrew's git / gitweb.git / walker.c
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walker.con commit blame: improve diagnosis for "--reverse NEW" (d993ce1)
   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        fprintf(stderr, "Cannot obtain needed %s %s\n",
  21                obj->type ? typename(obj->type): "object",
  22                oid_to_hex(&obj->oid));
  23        if (!is_null_sha1(current_commit_sha1))
  24                fprintf(stderr, "while processing commit %s.\n",
  25                        sha1_to_hex(current_commit_sha1));
  26}
  27
  28static int process(struct walker *walker, struct object *obj);
  29
  30static int process_tree(struct walker *walker, struct tree *tree)
  31{
  32        struct tree_desc desc;
  33        struct name_entry entry;
  34
  35        if (parse_tree(tree))
  36                return -1;
  37
  38        init_tree_desc(&desc, tree->buffer, tree->size);
  39        while (tree_entry(&desc, &entry)) {
  40                struct object *obj = NULL;
  41
  42                /* submodule commits are not stored in the superproject */
  43                if (S_ISGITLINK(entry.mode))
  44                        continue;
  45                if (S_ISDIR(entry.mode)) {
  46                        struct tree *tree = lookup_tree(entry.sha1);
  47                        if (tree)
  48                                obj = &tree->object;
  49                }
  50                else {
  51                        struct blob *blob = lookup_blob(entry.sha1);
  52                        if (blob)
  53                                obj = &blob->object;
  54                }
  55                if (!obj || process(walker, obj))
  56                        return -1;
  57        }
  58        free_tree_buffer(tree);
  59        return 0;
  60}
  61
  62/* Remember to update object flag allocation in object.h */
  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.oid.hash);
  82
  83        walker_say(walker, "walk %s\n", oid_to_hex(&commit->object.oid));
  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), oid_to_hex(&obj->oid));
 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_object_file(&obj->oid)) {
 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->oid.hash);
 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->oid.hash)) {
 174                                report_missing(obj);
 175                                return -1;
 176                        }
 177                }
 178                if (!obj->type)
 179                        parse_object(obj->oid.hash);
 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_oid.hash);
 194                        free(ref);
 195                        return 0;
 196                }
 197                free(ref);
 198        }
 199        return -1;
 200}
 201
 202static int mark_complete(const char *path, const struct object_id *oid,
 203                         int flag, void *cb_data)
 204{
 205        struct commit *commit = lookup_commit_reference_gently(oid->hash, 1);
 206
 207        if (commit) {
 208                commit->object.flags |= COMPLETE;
 209                commit_list_insert(commit, &complete);
 210        }
 211        return 0;
 212}
 213
 214int walker_targets_stdin(char ***target, const char ***write_ref)
 215{
 216        int targets = 0, targets_alloc = 0;
 217        struct strbuf buf = STRBUF_INIT;
 218        *target = NULL; *write_ref = NULL;
 219        while (1) {
 220                char *rf_one = NULL;
 221                char *tg_one;
 222
 223                if (strbuf_getline_lf(&buf, stdin) == EOF)
 224                        break;
 225                tg_one = buf.buf;
 226                rf_one = strchr(tg_one, '\t');
 227                if (rf_one)
 228                        *rf_one++ = 0;
 229
 230                if (targets >= targets_alloc) {
 231                        targets_alloc = targets_alloc ? targets_alloc * 2 : 64;
 232                        REALLOC_ARRAY(*target, targets_alloc);
 233                        REALLOC_ARRAY(*write_ref, targets_alloc);
 234                }
 235                (*target)[targets] = xstrdup(tg_one);
 236                (*write_ref)[targets] = xstrdup_or_null(rf_one);
 237                targets++;
 238        }
 239        strbuf_release(&buf);
 240        return targets;
 241}
 242
 243void walker_targets_free(int targets, char **target, const char **write_ref)
 244{
 245        while (targets--) {
 246                free(target[targets]);
 247                if (write_ref)
 248                        free((char *) write_ref[targets]);
 249        }
 250}
 251
 252int walker_fetch(struct walker *walker, int targets, char **target,
 253                 const char **write_ref, const char *write_ref_log_details)
 254{
 255        struct strbuf refname = STRBUF_INIT;
 256        struct strbuf err = STRBUF_INIT;
 257        struct ref_transaction *transaction = NULL;
 258        unsigned char *sha1 = xmalloc(targets * 20);
 259        char *msg = NULL;
 260        int i, ret = -1;
 261
 262        save_commit_buffer = 0;
 263
 264        if (write_ref) {
 265                transaction = ref_transaction_begin(&err);
 266                if (!transaction) {
 267                        error("%s", err.buf);
 268                        goto done;
 269                }
 270        }
 271
 272        if (!walker->get_recover) {
 273                for_each_ref(mark_complete, NULL);
 274                commit_list_sort_by_date(&complete);
 275        }
 276
 277        for (i = 0; i < targets; i++) {
 278                if (interpret_target(walker, target[i], &sha1[20 * i])) {
 279                        error("Could not interpret response from server '%s' as something to pull", target[i]);
 280                        goto done;
 281                }
 282                if (process(walker, lookup_unknown_object(&sha1[20 * i])))
 283                        goto done;
 284        }
 285
 286        if (loop(walker))
 287                goto done;
 288        if (!write_ref) {
 289                ret = 0;
 290                goto done;
 291        }
 292        if (write_ref_log_details) {
 293                msg = xstrfmt("fetch from %s", write_ref_log_details);
 294        } else {
 295                msg = NULL;
 296        }
 297        for (i = 0; i < targets; i++) {
 298                if (!write_ref[i])
 299                        continue;
 300                strbuf_reset(&refname);
 301                strbuf_addf(&refname, "refs/%s", write_ref[i]);
 302                if (ref_transaction_update(transaction, refname.buf,
 303                                           &sha1[20 * i], NULL, 0,
 304                                           msg ? msg : "fetch (unknown)",
 305                                           &err)) {
 306                        error("%s", err.buf);
 307                        goto done;
 308                }
 309        }
 310        if (ref_transaction_commit(transaction, &err)) {
 311                error("%s", err.buf);
 312                goto done;
 313        }
 314
 315        ret = 0;
 316
 317done:
 318        ref_transaction_free(transaction);
 319        free(msg);
 320        free(sha1);
 321        strbuf_release(&err);
 322        strbuf_release(&refname);
 323        return ret;
 324}
 325
 326void walker_free(struct walker *walker)
 327{
 328        walker->cleanup(walker);
 329        free(walker);
 330}