Andrew's git / gitweb.git / walker.c
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walker.con commit Doc/git-submodule: improve readability and grammar of a sentence (e1b3f3d)
   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 struct object_id current_commit_oid;
  11
  12void walker_say(struct walker *walker, const char *fmt, ...)
  13{
  14        if (walker->get_verbosely) {
  15                va_list ap;
  16                va_start(ap, fmt);
  17                vfprintf(stderr, fmt, ap);
  18                va_end(ap);
  19        }
  20}
  21
  22static void report_missing(const struct object *obj)
  23{
  24        fprintf(stderr, "Cannot obtain needed %s %s\n",
  25                obj->type ? typename(obj->type): "object",
  26                oid_to_hex(&obj->oid));
  27        if (!is_null_oid(&current_commit_oid))
  28                fprintf(stderr, "while processing commit %s.\n",
  29                        oid_to_hex(&current_commit_oid));
  30}
  31
  32static int process(struct walker *walker, struct object *obj);
  33
  34static int process_tree(struct walker *walker, struct tree *tree)
  35{
  36        struct tree_desc desc;
  37        struct name_entry entry;
  38
  39        if (parse_tree(tree))
  40                return -1;
  41
  42        init_tree_desc(&desc, tree->buffer, tree->size);
  43        while (tree_entry(&desc, &entry)) {
  44                struct object *obj = NULL;
  45
  46                /* submodule commits are not stored in the superproject */
  47                if (S_ISGITLINK(entry.mode))
  48                        continue;
  49                if (S_ISDIR(entry.mode)) {
  50                        struct tree *tree = lookup_tree(entry.oid);
  51                        if (tree)
  52                                obj = &tree->object;
  53                }
  54                else {
  55                        struct blob *blob = lookup_blob(entry.oid);
  56                        if (blob)
  57                                obj = &blob->object;
  58                }
  59                if (!obj || process(walker, obj))
  60                        return -1;
  61        }
  62        free_tree_buffer(tree);
  63        return 0;
  64}
  65
  66/* Remember to update object flag allocation in object.h */
  67#define COMPLETE        (1U << 0)
  68#define SEEN            (1U << 1)
  69#define TO_SCAN         (1U << 2)
  70
  71static struct commit_list *complete = NULL;
  72
  73static int process_commit(struct walker *walker, struct commit *commit)
  74{
  75        if (parse_commit(commit))
  76                return -1;
  77
  78        while (complete && complete->item->date >= commit->date) {
  79                pop_most_recent_commit(&complete, COMPLETE);
  80        }
  81
  82        if (commit->object.flags & COMPLETE)
  83                return 0;
  84
  85        oidcpy(&current_commit_oid, &commit->object.oid);
  86
  87        walker_say(walker, "walk %s\n", oid_to_hex(&commit->object.oid));
  88
  89        if (walker->get_tree) {
  90                if (process(walker, &commit->tree->object))
  91                        return -1;
  92                if (!walker->get_all)
  93                        walker->get_tree = 0;
  94        }
  95        if (walker->get_history) {
  96                struct commit_list *parents = commit->parents;
  97                for (; parents; parents = parents->next) {
  98                        if (process(walker, &parents->item->object))
  99                                return -1;
 100                }
 101        }
 102        return 0;
 103}
 104
 105static int process_tag(struct walker *walker, struct tag *tag)
 106{
 107        if (parse_tag(tag))
 108                return -1;
 109        return process(walker, tag->tagged);
 110}
 111
 112static struct object_list *process_queue = NULL;
 113static struct object_list **process_queue_end = &process_queue;
 114
 115static int process_object(struct walker *walker, struct object *obj)
 116{
 117        if (obj->type == OBJ_COMMIT) {
 118                if (process_commit(walker, (struct commit *)obj))
 119                        return -1;
 120                return 0;
 121        }
 122        if (obj->type == OBJ_TREE) {
 123                if (process_tree(walker, (struct tree *)obj))
 124                        return -1;
 125                return 0;
 126        }
 127        if (obj->type == OBJ_BLOB) {
 128                return 0;
 129        }
 130        if (obj->type == OBJ_TAG) {
 131                if (process_tag(walker, (struct tag *)obj))
 132                        return -1;
 133                return 0;
 134        }
 135        return error("Unable to determine requirements "
 136                     "of type %s for %s",
 137                     typename(obj->type), oid_to_hex(&obj->oid));
 138}
 139
 140static int process(struct walker *walker, struct object *obj)
 141{
 142        if (obj->flags & SEEN)
 143                return 0;
 144        obj->flags |= SEEN;
 145
 146        if (has_object_file(&obj->oid)) {
 147                /* We already have it, so we should scan it now. */
 148                obj->flags |= TO_SCAN;
 149        }
 150        else {
 151                if (obj->flags & COMPLETE)
 152                        return 0;
 153                walker->prefetch(walker, obj->oid.hash);
 154        }
 155
 156        object_list_insert(obj, process_queue_end);
 157        process_queue_end = &(*process_queue_end)->next;
 158        return 0;
 159}
 160
 161static int loop(struct walker *walker)
 162{
 163        struct object_list *elem;
 164
 165        while (process_queue) {
 166                struct object *obj = process_queue->item;
 167                elem = process_queue;
 168                process_queue = elem->next;
 169                free(elem);
 170                if (!process_queue)
 171                        process_queue_end = &process_queue;
 172
 173                /* If we are not scanning this object, we placed it in
 174                 * the queue because we needed to fetch it first.
 175                 */
 176                if (! (obj->flags & TO_SCAN)) {
 177                        if (walker->fetch(walker, obj->oid.hash)) {
 178                                report_missing(obj);
 179                                return -1;
 180                        }
 181                }
 182                if (!obj->type)
 183                        parse_object(&obj->oid);
 184                if (process_object(walker, obj))
 185                        return -1;
 186        }
 187        return 0;
 188}
 189
 190static int interpret_target(struct walker *walker, char *target, struct object_id *oid)
 191{
 192        if (!get_oid_hex(target, oid))
 193                return 0;
 194        if (!check_refname_format(target, 0)) {
 195                struct ref *ref = alloc_ref(target);
 196                if (!walker->fetch_ref(walker, ref)) {
 197                        oidcpy(oid, &ref->old_oid);
 198                        free(ref);
 199                        return 0;
 200                }
 201                free(ref);
 202        }
 203        return -1;
 204}
 205
 206static int mark_complete(const char *path, const struct object_id *oid,
 207                         int flag, void *cb_data)
 208{
 209        struct commit *commit = lookup_commit_reference_gently(oid, 1);
 210
 211        if (commit) {
 212                commit->object.flags |= COMPLETE;
 213                commit_list_insert(commit, &complete);
 214        }
 215        return 0;
 216}
 217
 218int walker_targets_stdin(char ***target, const char ***write_ref)
 219{
 220        int targets = 0, targets_alloc = 0;
 221        struct strbuf buf = STRBUF_INIT;
 222        *target = NULL; *write_ref = NULL;
 223        while (1) {
 224                char *rf_one = NULL;
 225                char *tg_one;
 226
 227                if (strbuf_getline_lf(&buf, stdin) == EOF)
 228                        break;
 229                tg_one = buf.buf;
 230                rf_one = strchr(tg_one, '\t');
 231                if (rf_one)
 232                        *rf_one++ = 0;
 233
 234                if (targets >= targets_alloc) {
 235                        targets_alloc = targets_alloc ? targets_alloc * 2 : 64;
 236                        REALLOC_ARRAY(*target, targets_alloc);
 237                        REALLOC_ARRAY(*write_ref, targets_alloc);
 238                }
 239                (*target)[targets] = xstrdup(tg_one);
 240                (*write_ref)[targets] = xstrdup_or_null(rf_one);
 241                targets++;
 242        }
 243        strbuf_release(&buf);
 244        return targets;
 245}
 246
 247void walker_targets_free(int targets, char **target, const char **write_ref)
 248{
 249        while (targets--) {
 250                free(target[targets]);
 251                if (write_ref)
 252                        free((char *) write_ref[targets]);
 253        }
 254}
 255
 256int walker_fetch(struct walker *walker, int targets, char **target,
 257                 const char **write_ref, const char *write_ref_log_details)
 258{
 259        struct strbuf refname = STRBUF_INIT;
 260        struct strbuf err = STRBUF_INIT;
 261        struct ref_transaction *transaction = NULL;
 262        struct object_id *oids = xmalloc(targets * sizeof(struct object_id));
 263        char *msg = NULL;
 264        int i, ret = -1;
 265
 266        save_commit_buffer = 0;
 267
 268        if (write_ref) {
 269                transaction = ref_transaction_begin(&err);
 270                if (!transaction) {
 271                        error("%s", err.buf);
 272                        goto done;
 273                }
 274        }
 275
 276        if (!walker->get_recover) {
 277                for_each_ref(mark_complete, NULL);
 278                commit_list_sort_by_date(&complete);
 279        }
 280
 281        for (i = 0; i < targets; i++) {
 282                if (interpret_target(walker, target[i], oids + i)) {
 283                        error("Could not interpret response from server '%s' as something to pull", target[i]);
 284                        goto done;
 285                }
 286                if (process(walker, lookup_unknown_object(oids[i].hash)))
 287                        goto done;
 288        }
 289
 290        if (loop(walker))
 291                goto done;
 292        if (!write_ref) {
 293                ret = 0;
 294                goto done;
 295        }
 296        if (write_ref_log_details) {
 297                msg = xstrfmt("fetch from %s", write_ref_log_details);
 298        } else {
 299                msg = NULL;
 300        }
 301        for (i = 0; i < targets; i++) {
 302                if (!write_ref[i])
 303                        continue;
 304                strbuf_reset(&refname);
 305                strbuf_addf(&refname, "refs/%s", write_ref[i]);
 306                if (ref_transaction_update(transaction, refname.buf,
 307                                           oids + i, NULL, 0,
 308                                           msg ? msg : "fetch (unknown)",
 309                                           &err)) {
 310                        error("%s", err.buf);
 311                        goto done;
 312                }
 313        }
 314        if (ref_transaction_commit(transaction, &err)) {
 315                error("%s", err.buf);
 316                goto done;
 317        }
 318
 319        ret = 0;
 320
 321done:
 322        ref_transaction_free(transaction);
 323        free(msg);
 324        free(oids);
 325        strbuf_release(&err);
 326        strbuf_release(&refname);
 327        return ret;
 328}
 329
 330void walker_free(struct walker *walker)
 331{
 332        walker->cleanup(walker);
 333        free(walker);
 334}