bc27a8e3df59915d13bdca357fbe76789caf646e
   1#include "cache.h"
   2#include "remote.h"
   3#include "refs.h"
   4
   5static struct remote **remotes;
   6static int allocated_remotes;
   7
   8#define BUF_SIZE (2048)
   9static char buffer[BUF_SIZE];
  10
  11static void add_push_refspec(struct remote *remote, const char *ref)
  12{
  13        int nr = remote->push_refspec_nr + 1;
  14        remote->push_refspec =
  15                xrealloc(remote->push_refspec, nr * sizeof(char *));
  16        remote->push_refspec[nr-1] = ref;
  17        remote->push_refspec_nr = nr;
  18}
  19
  20static void add_uri(struct remote *remote, const char *uri)
  21{
  22        int nr = remote->uri_nr + 1;
  23        remote->uri =
  24                xrealloc(remote->uri, nr * sizeof(char *));
  25        remote->uri[nr-1] = uri;
  26        remote->uri_nr = nr;
  27}
  28
  29static struct remote *make_remote(const char *name, int len)
  30{
  31        int i, empty = -1;
  32
  33        for (i = 0; i < allocated_remotes; i++) {
  34                if (!remotes[i]) {
  35                        if (empty < 0)
  36                                empty = i;
  37                } else {
  38                        if (len ? (!strncmp(name, remotes[i]->name, len) &&
  39                                   !remotes[i]->name[len]) :
  40                            !strcmp(name, remotes[i]->name))
  41                                return remotes[i];
  42                }
  43        }
  44
  45        if (empty < 0) {
  46                empty = allocated_remotes;
  47                allocated_remotes += allocated_remotes ? allocated_remotes : 1;
  48                remotes = xrealloc(remotes,
  49                                   sizeof(*remotes) * allocated_remotes);
  50                memset(remotes + empty, 0,
  51                       (allocated_remotes - empty) * sizeof(*remotes));
  52        }
  53        remotes[empty] = xcalloc(1, sizeof(struct remote));
  54        if (len)
  55                remotes[empty]->name = xstrndup(name, len);
  56        else
  57                remotes[empty]->name = xstrdup(name);
  58        return remotes[empty];
  59}
  60
  61static void read_remotes_file(struct remote *remote)
  62{
  63        FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
  64
  65        if (!f)
  66                return;
  67        while (fgets(buffer, BUF_SIZE, f)) {
  68                int value_list;
  69                char *s, *p;
  70
  71                if (!prefixcmp(buffer, "URL:")) {
  72                        value_list = 0;
  73                        s = buffer + 4;
  74                } else if (!prefixcmp(buffer, "Push:")) {
  75                        value_list = 1;
  76                        s = buffer + 5;
  77                } else
  78                        continue;
  79
  80                while (isspace(*s))
  81                        s++;
  82                if (!*s)
  83                        continue;
  84
  85                p = s + strlen(s);
  86                while (isspace(p[-1]))
  87                        *--p = 0;
  88
  89                switch (value_list) {
  90                case 0:
  91                        add_uri(remote, xstrdup(s));
  92                        break;
  93                case 1:
  94                        add_push_refspec(remote, xstrdup(s));
  95                        break;
  96                }
  97        }
  98        fclose(f);
  99}
 100
 101static void read_branches_file(struct remote *remote)
 102{
 103        const char *slash = strchr(remote->name, '/');
 104        int n = slash ? slash - remote->name : 1000;
 105        FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
 106        char *s, *p;
 107        int len;
 108
 109        if (!f)
 110                return;
 111        s = fgets(buffer, BUF_SIZE, f);
 112        fclose(f);
 113        if (!s)
 114                return;
 115        while (isspace(*s))
 116                s++;
 117        if (!*s)
 118                return;
 119        p = s + strlen(s);
 120        while (isspace(p[-1]))
 121                *--p = 0;
 122        len = p - s;
 123        if (slash)
 124                len += strlen(slash);
 125        p = xmalloc(len + 1);
 126        strcpy(p, s);
 127        if (slash)
 128                strcat(p, slash);
 129        add_uri(remote, p);
 130}
 131
 132static char *default_remote_name = NULL;
 133static const char *current_branch = NULL;
 134static int current_branch_len = 0;
 135
 136static int handle_config(const char *key, const char *value)
 137{
 138        const char *name;
 139        const char *subkey;
 140        struct remote *remote;
 141        if (!prefixcmp(key, "branch.") && current_branch &&
 142            !strncmp(key + 7, current_branch, current_branch_len) &&
 143            !strcmp(key + 7 + current_branch_len, ".remote")) {
 144                free(default_remote_name);
 145                default_remote_name = xstrdup(value);
 146        }
 147        if (prefixcmp(key,  "remote."))
 148                return 0;
 149        name = key + 7;
 150        subkey = strrchr(name, '.');
 151        if (!subkey)
 152                return error("Config with no key for remote %s", name);
 153        if (*subkey == '/') {
 154                warning("Config remote shorthand cannot begin with '/': %s", name);
 155                return 0;
 156        }
 157        remote = make_remote(name, subkey - name);
 158        if (!value) {
 159                /* if we ever have a boolean variable, e.g. "remote.*.disabled"
 160                 * [remote "frotz"]
 161                 *      disabled
 162                 * is a valid way to set it to true; we get NULL in value so
 163                 * we need to handle it here.
 164                 *
 165                 * if (!strcmp(subkey, ".disabled")) {
 166                 *      val = git_config_bool(key, value);
 167                 *      return 0;
 168                 * } else
 169                 *
 170                 */
 171                return 0; /* ignore unknown booleans */
 172        }
 173        if (!strcmp(subkey, ".url")) {
 174                add_uri(remote, xstrdup(value));
 175        } else if (!strcmp(subkey, ".push")) {
 176                add_push_refspec(remote, xstrdup(value));
 177        } else if (!strcmp(subkey, ".receivepack")) {
 178                if (!remote->receivepack)
 179                        remote->receivepack = xstrdup(value);
 180                else
 181                        error("more than one receivepack given, using the first");
 182        }
 183        return 0;
 184}
 185
 186static void read_config(void)
 187{
 188        unsigned char sha1[20];
 189        const char *head_ref;
 190        int flag;
 191        if (default_remote_name) // did this already
 192                return;
 193        default_remote_name = xstrdup("origin");
 194        current_branch = NULL;
 195        head_ref = resolve_ref("HEAD", sha1, 0, &flag);
 196        if (head_ref && (flag & REF_ISSYMREF) &&
 197            !prefixcmp(head_ref, "refs/heads/")) {
 198                current_branch = head_ref + strlen("refs/heads/");
 199                current_branch_len = strlen(current_branch);
 200        }
 201        git_config(handle_config);
 202}
 203
 204static struct refspec *parse_ref_spec(int nr_refspec, const char **refspec)
 205{
 206        int i;
 207        struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
 208        for (i = 0; i < nr_refspec; i++) {
 209                const char *sp, *ep, *gp;
 210                sp = refspec[i];
 211                if (*sp == '+') {
 212                        rs[i].force = 1;
 213                        sp++;
 214                }
 215                gp = strchr(sp, '*');
 216                ep = strchr(sp, ':');
 217                if (gp && ep && gp > ep)
 218                        gp = NULL;
 219                if (ep) {
 220                        if (ep[1]) {
 221                                const char *glob = strchr(ep + 1, '*');
 222                                if (!glob)
 223                                        gp = NULL;
 224                                if (gp)
 225                                        rs[i].dst = xstrndup(ep + 1,
 226                                                             glob - ep - 1);
 227                                else
 228                                        rs[i].dst = xstrdup(ep + 1);
 229                        }
 230                } else {
 231                        ep = sp + strlen(sp);
 232                }
 233                if (gp) {
 234                        rs[i].pattern = 1;
 235                        ep = gp;
 236                }
 237                rs[i].src = xstrndup(sp, ep - sp);
 238        }
 239        return rs;
 240}
 241
 242struct remote *remote_get(const char *name)
 243{
 244        struct remote *ret;
 245
 246        read_config();
 247        if (!name)
 248                name = default_remote_name;
 249        ret = make_remote(name, 0);
 250        if (name[0] != '/') {
 251                if (!ret->uri)
 252                        read_remotes_file(ret);
 253                if (!ret->uri)
 254                        read_branches_file(ret);
 255        }
 256        if (!ret->uri)
 257                add_uri(ret, name);
 258        if (!ret->uri)
 259                return NULL;
 260        ret->push = parse_ref_spec(ret->push_refspec_nr, ret->push_refspec);
 261        return ret;
 262}
 263
 264static int count_refspec_match(const char *pattern,
 265                               struct ref *refs,
 266                               struct ref **matched_ref)
 267{
 268        int patlen = strlen(pattern);
 269        struct ref *matched_weak = NULL;
 270        struct ref *matched = NULL;
 271        int weak_match = 0;
 272        int match = 0;
 273
 274        for (weak_match = match = 0; refs; refs = refs->next) {
 275                char *name = refs->name;
 276                int namelen = strlen(name);
 277                int weak_match;
 278
 279                if (namelen < patlen ||
 280                    memcmp(name + namelen - patlen, pattern, patlen))
 281                        continue;
 282                if (namelen != patlen && name[namelen - patlen - 1] != '/')
 283                        continue;
 284
 285                /* A match is "weak" if it is with refs outside
 286                 * heads or tags, and did not specify the pattern
 287                 * in full (e.g. "refs/remotes/origin/master") or at
 288                 * least from the toplevel (e.g. "remotes/origin/master");
 289                 * otherwise "git push $URL master" would result in
 290                 * ambiguity between remotes/origin/master and heads/master
 291                 * at the remote site.
 292                 */
 293                if (namelen != patlen &&
 294                    patlen != namelen - 5 &&
 295                    prefixcmp(name, "refs/heads/") &&
 296                    prefixcmp(name, "refs/tags/")) {
 297                        /* We want to catch the case where only weak
 298                         * matches are found and there are multiple
 299                         * matches, and where more than one strong
 300                         * matches are found, as ambiguous.  One
 301                         * strong match with zero or more weak matches
 302                         * are acceptable as a unique match.
 303                         */
 304                        matched_weak = refs;
 305                        weak_match++;
 306                }
 307                else {
 308                        matched = refs;
 309                        match++;
 310                }
 311        }
 312        if (!matched) {
 313                *matched_ref = matched_weak;
 314                return weak_match;
 315        }
 316        else {
 317                *matched_ref = matched;
 318                return match;
 319        }
 320}
 321
 322static void link_dst_tail(struct ref *ref, struct ref ***tail)
 323{
 324        **tail = ref;
 325        *tail = &ref->next;
 326        **tail = NULL;
 327}
 328
 329static struct ref *try_explicit_object_name(const char *name)
 330{
 331        unsigned char sha1[20];
 332        struct ref *ref;
 333        int len;
 334
 335        if (!*name) {
 336                ref = xcalloc(1, sizeof(*ref) + 20);
 337                strcpy(ref->name, "(delete)");
 338                hashclr(ref->new_sha1);
 339                return ref;
 340        }
 341        if (get_sha1(name, sha1))
 342                return NULL;
 343        len = strlen(name) + 1;
 344        ref = xcalloc(1, sizeof(*ref) + len);
 345        memcpy(ref->name, name, len);
 346        hashcpy(ref->new_sha1, sha1);
 347        return ref;
 348}
 349
 350static int match_explicit_refs(struct ref *src, struct ref *dst,
 351                               struct ref ***dst_tail, struct refspec *rs,
 352                               int rs_nr)
 353{
 354        int i, errs;
 355        for (i = errs = 0; i < rs_nr; i++) {
 356                struct ref *matched_src, *matched_dst;
 357
 358                const char *dst_value = rs[i].dst;
 359                if (dst_value == NULL)
 360                        dst_value = rs[i].src;
 361
 362                matched_src = matched_dst = NULL;
 363                switch (count_refspec_match(rs[i].src, src, &matched_src)) {
 364                case 1:
 365                        break;
 366                case 0:
 367                        /* The source could be in the get_sha1() format
 368                         * not a reference name.  :refs/other is a
 369                         * way to delete 'other' ref at the remote end.
 370                         */
 371                        matched_src = try_explicit_object_name(rs[i].src);
 372                        if (matched_src)
 373                                break;
 374                        errs = 1;
 375                        error("src refspec %s does not match any.",
 376                              rs[i].src);
 377                        break;
 378                default:
 379                        errs = 1;
 380                        error("src refspec %s matches more than one.",
 381                              rs[i].src);
 382                        break;
 383                }
 384                switch (count_refspec_match(dst_value, dst, &matched_dst)) {
 385                case 1:
 386                        break;
 387                case 0:
 388                        if (!memcmp(dst_value, "refs/", 5)) {
 389                                int len = strlen(dst_value) + 1;
 390                                matched_dst = xcalloc(1, sizeof(*dst) + len);
 391                                memcpy(matched_dst->name, dst_value, len);
 392                                link_dst_tail(matched_dst, dst_tail);
 393                        }
 394                        else if (!strcmp(rs[i].src, dst_value) &&
 395                                 matched_src) {
 396                                /* pushing "master:master" when
 397                                 * remote does not have master yet.
 398                                 */
 399                                int len = strlen(matched_src->name) + 1;
 400                                matched_dst = xcalloc(1, sizeof(*dst) + len);
 401                                memcpy(matched_dst->name, matched_src->name,
 402                                       len);
 403                                link_dst_tail(matched_dst, dst_tail);
 404                        }
 405                        else {
 406                                errs = 1;
 407                                error("dst refspec %s does not match any "
 408                                      "existing ref on the remote and does "
 409                                      "not start with refs/.", dst_value);
 410                        }
 411                        break;
 412                default:
 413                        errs = 1;
 414                        error("dst refspec %s matches more than one.",
 415                              dst_value);
 416                        break;
 417                }
 418                if (errs)
 419                        continue;
 420                if (matched_dst->peer_ref) {
 421                        errs = 1;
 422                        error("dst ref %s receives from more than one src.",
 423                              matched_dst->name);
 424                }
 425                else {
 426                        matched_dst->peer_ref = matched_src;
 427                        matched_dst->force = rs[i].force;
 428                }
 429        }
 430        return -errs;
 431}
 432
 433static struct ref *find_ref_by_name(struct ref *list, const char *name)
 434{
 435        for ( ; list; list = list->next)
 436                if (!strcmp(list->name, name))
 437                        return list;
 438        return NULL;
 439}
 440
 441int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
 442               int nr_refspec, char **refspec, int all)
 443{
 444        struct refspec *rs =
 445                parse_ref_spec(nr_refspec, (const char **) refspec);
 446
 447        if (nr_refspec)
 448                return match_explicit_refs(src, dst, dst_tail, rs, nr_refspec);
 449
 450        /* pick the remainder */
 451        for ( ; src; src = src->next) {
 452                struct ref *dst_peer;
 453                if (src->peer_ref)
 454                        continue;
 455                dst_peer = find_ref_by_name(dst, src->name);
 456                if ((dst_peer && dst_peer->peer_ref) || (!dst_peer && !all))
 457                        continue;
 458                if (!dst_peer) {
 459                        /* Create a new one and link it */
 460                        int len = strlen(src->name) + 1;
 461                        dst_peer = xcalloc(1, sizeof(*dst_peer) + len);
 462                        memcpy(dst_peer->name, src->name, len);
 463                        hashcpy(dst_peer->new_sha1, src->new_sha1);
 464                        link_dst_tail(dst_peer, dst_tail);
 465                }
 466                dst_peer->peer_ref = src;
 467        }
 468        return 0;
 469}