shared.c

   1 /* shared.c: global vars + some callback functions
   2  *
   3  * Copyright (C) 2006-2014 cgit Development Team <cgit@lists.zx2c4.com>
   4  *
   5  * Licensed under GNU General Public License v2
   6  *   (see COPYING for full license text)
   7  */
   8
   9 #include "cgit.h"
  10
  11 struct cgit_repolist cgit_repolist;
  12 struct cgit_context ctx;
  13
  14 int chk_zero(int result, char *msg)
  15 {
  16         if (result != 0)
  17                 die_errno("%s", msg);
  18         return result;
  19 }
  20
  21 int chk_positive(int result, char *msg)
  22 {
  23         if (result <= 0)
  24                 die_errno("%s", msg);
  25         return result;
  26 }
  27
  28 int chk_non_negative(int result, char *msg)
  29 {
  30         if (result < 0)
  31                 die_errno("%s", msg);
  32         return result;
  33 }
  34
  35 char *cgit_default_repo_desc = "[no description]";
  36 struct cgit_repo *cgit_add_repo(const char *url)
  37 {
  38         struct cgit_repo *ret;
  39
  40         if (++cgit_repolist.count > cgit_repolist.length) {
  41                 if (cgit_repolist.length == 0)
  42                         cgit_repolist.length = 8;
  43                 else
  44                         cgit_repolist.length *= 2;
  45                 cgit_repolist.repos = xrealloc(cgit_repolist.repos,
  46                                                cgit_repolist.length *
  47                                                sizeof(struct cgit_repo));
  48         }
  49
  50         ret = &cgit_repolist.repos[cgit_repolist.count-1];
  51         memset(ret, 0, sizeof(struct cgit_repo));
  52         ret->url = trim_end(url, '/');
  53         ret->name = ret->url;
  54         ret->path = NULL;
  55         ret->desc = cgit_default_repo_desc;
  56         ret->owner = NULL;
  57         ret->homepage = NULL;
  58         ret->section = ctx.cfg.section;
  59         ret->snapshots = ctx.cfg.snapshots;
  60         ret->enable_commit_graph = ctx.cfg.enable_commit_graph;
  61         ret->enable_log_filecount = ctx.cfg.enable_log_filecount;
  62         ret->enable_log_linecount = ctx.cfg.enable_log_linecount;
  63         ret->enable_remote_branches = ctx.cfg.enable_remote_branches;
  64         ret->enable_subject_links = ctx.cfg.enable_subject_links;
  65         ret->enable_html_serving = ctx.cfg.enable_html_serving;
  66         ret->max_stats = ctx.cfg.max_stats;
  67         ret->branch_sort = ctx.cfg.branch_sort;
  68         ret->commit_sort = ctx.cfg.commit_sort;
  69         ret->module_link = ctx.cfg.module_link;
  70         ret->readme = ctx.cfg.readme;
  71         ret->mtime = -1;
  72         ret->about_filter = ctx.cfg.about_filter;
  73         ret->commit_filter = ctx.cfg.commit_filter;
  74         ret->source_filter = ctx.cfg.source_filter;
  75         ret->email_filter = ctx.cfg.email_filter;
  76         ret->owner_filter = ctx.cfg.owner_filter;
  77         ret->clone_url = ctx.cfg.clone_url;
  78         ret->submodules.strdup_strings = 1;
  79         ret->hide = ret->ignore = 0;
  80         return ret;
  81 }
  82
  83 struct cgit_repo *cgit_get_repoinfo(const char *url)
  84 {
  85         int i;
  86         struct cgit_repo *repo;
  87
  88         for (i = 0; i < cgit_repolist.count; i++) {
  89                 repo = &cgit_repolist.repos[i];
  90                 if (repo->ignore)
  91                         continue;
  92                 if (!strcmp(repo->url, url))
  93                         return repo;
  94         }
  95         return NULL;
  96 }
  97
  98 void cgit_free_commitinfo(struct commitinfo *info)
  99 {
 100         free(info->author);
 101         free(info->author_email);
 102         free(info->committer);
 103         free(info->committer_email);
 104         free(info->subject);
 105         free(info->msg);
 106         free(info->msg_encoding);
 107         free(info);
 108 }
 109
 110 char *trim_end(const char *str, char c)
 111 {
 112         int len;
 113
 114         if (str == NULL)
 115                 return NULL;
 116         len = strlen(str);
 117         while (len > 0 && str[len - 1] == c)
 118                 len--;
 119         if (len == 0)
 120                 return NULL;
 121         return xstrndup(str, len);
 122 }
 123
 124 char *ensure_end(const char *str, char c)
 125 {
 126         size_t len = strlen(str);
 127         char *result;
 128
 129         if (len && str[len - 1] == c)
 130                 return xstrndup(str, len);
 131
 132         result = xmalloc(len + 2);
 133         memcpy(result, str, len);
 134         result[len] = '/';
 135         result[len + 1] = '\0';
 136         return result;
 137 }
 138
 139 void strbuf_ensure_end(struct strbuf *sb, char c)
 140 {
 141         if (!sb->len || sb->buf[sb->len - 1] != c)
 142                 strbuf_addch(sb, c);
 143 }
 144
 145 char *strlpart(char *txt, int maxlen)
 146 {
 147         char *result;
 148
 149         if (!txt)
 150                 return txt;
 151
 152         if (strlen(txt) <= maxlen)
 153                 return txt;
 154         result = xmalloc(maxlen + 1);
 155         memcpy(result, txt, maxlen - 3);
 156         result[maxlen-1] = result[maxlen-2] = result[maxlen-3] = '.';
 157         result[maxlen] = '\0';
 158         return result;
 159 }
 160
 161 void cgit_add_ref(struct reflist *list, struct refinfo *ref)
 162 {
 163         size_t size;
 164
 165         if (list->count >= list->alloc) {
 166                 list->alloc += (list->alloc ? list->alloc : 4);
 167                 size = list->alloc * sizeof(struct refinfo *);
 168                 list->refs = xrealloc(list->refs, size);
 169         }
 170         list->refs[list->count++] = ref;
 171 }
 172
 173 static struct refinfo *cgit_mk_refinfo(const char *refname, const struct object_id *oid)
 174 {
 175         struct refinfo *ref;
 176
 177         ref = xmalloc(sizeof (struct refinfo));
 178         ref->refname = xstrdup(refname);
 179         ref->object = parse_object(oid->hash);
 180         switch (ref->object->type) {
 181         case OBJ_TAG:
 182                 ref->tag = cgit_parse_tag((struct tag *)ref->object);
 183                 break;
 184         case OBJ_COMMIT:
 185                 ref->commit = cgit_parse_commit((struct commit *)ref->object);
 186                 break;
 187         }
 188         return ref;
 189 }
 190
 191 void cgit_free_taginfo(struct taginfo *tag)
 192 {
 193         if (tag->tagger)
 194                 free(tag->tagger);
 195         if (tag->tagger_email)
 196                 free(tag->tagger_email);
 197         if (tag->msg)
 198                 free(tag->msg);
 199         free(tag);
 200 }
 201
 202 static void cgit_free_refinfo(struct refinfo *ref)
 203 {
 204         if (ref->refname)
 205                 free((char *)ref->refname);
 206         switch (ref->object->type) {
 207         case OBJ_TAG:
 208                 cgit_free_taginfo(ref->tag);
 209                 break;
 210         case OBJ_COMMIT:
 211                 cgit_free_commitinfo(ref->commit);
 212                 break;
 213         }
 214         free(ref);
 215 }
 216
 217 void cgit_free_reflist_inner(struct reflist *list)
 218 {
 219         int i;
 220
 221         for (i = 0; i < list->count; i++) {
 222                 cgit_free_refinfo(list->refs[i]);
 223         }
 224         free(list->refs);
 225 }
 226
 227 int cgit_refs_cb(const char *refname, const struct object_id *oid, int flags,
 228                   void *cb_data)
 229 {
 230         struct reflist *list = (struct reflist *)cb_data;
 231         struct refinfo *info = cgit_mk_refinfo(refname, oid);
 232
 233         if (info)
 234                 cgit_add_ref(list, info);
 235         return 0;
 236 }
 237
 238 void cgit_diff_tree_cb(struct diff_queue_struct *q,
 239                        struct diff_options *options, void *data)
 240 {
 241         int i;
 242
 243         for (i = 0; i < q->nr; i++) {
 244                 if (q->queue[i]->status == 'U')
 245                         continue;
 246                 ((filepair_fn)data)(q->queue[i]);
 247         }
 248 }
 249
 250 static int load_mmfile(mmfile_t *file, const struct object_id *oid)
 251 {
 252         enum object_type type;
 253
 254         if (is_null_oid(oid)) {
 255                 file->ptr = (char *)"";
 256                 file->size = 0;
 257         } else {
 258                 file->ptr = read_sha1_file(oid->hash, &type,
 259                                            (unsigned long *)&file->size);
 260         }
 261         return 1;
 262 }
 263
 264 /*
 265  * Receive diff-buffers from xdiff and concatenate them as
 266  * needed across multiple callbacks.
 267  *
 268  * This is basically a copy of xdiff-interface.c/xdiff_outf(),
 269  * ripped from git and modified to use globals instead of
 270  * a special callback-struct.
 271  */
 272 static char *diffbuf = NULL;
 273 static int buflen = 0;
 274
 275 static int filediff_cb(void *priv, mmbuffer_t *mb, int nbuf)
 276 {
 277         int i;
 278
 279         for (i = 0; i < nbuf; i++) {
 280                 if (mb[i].ptr[mb[i].size-1] != '\n') {
 281                         /* Incomplete line */
 282                         diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
 283                         memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
 284                         buflen += mb[i].size;
 285                         continue;
 286                 }
 287
 288                 /* we have a complete line */
 289                 if (!diffbuf) {
 290                         ((linediff_fn)priv)(mb[i].ptr, mb[i].size);
 291                         continue;
 292                 }
 293                 diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
 294                 memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
 295                 ((linediff_fn)priv)(diffbuf, buflen + mb[i].size);
 296                 free(diffbuf);
 297                 diffbuf = NULL;
 298                 buflen = 0;
 299         }
 300         if (diffbuf) {
 301                 ((linediff_fn)priv)(diffbuf, buflen);
 302                 free(diffbuf);
 303                 diffbuf = NULL;
 304                 buflen = 0;
 305         }
 306         return 0;
 307 }
 308
 309 int cgit_diff_files(const struct object_id *old_oid,
 310                     const struct object_id *new_oid, unsigned long *old_size,
 311                     unsigned long *new_size, int *binary, int context,
 312                     int ignorews, linediff_fn fn)
 313 {
 314         mmfile_t file1, file2;
 315         xpparam_t diff_params;
 316         xdemitconf_t emit_params;
 317         xdemitcb_t emit_cb;
 318
 319         if (!load_mmfile(&file1, old_oid) || !load_mmfile(&file2, new_oid))
 320                 return 1;
 321
 322         *old_size = file1.size;
 323         *new_size = file2.size;
 324
 325         if ((file1.ptr && buffer_is_binary(file1.ptr, file1.size)) ||
 326             (file2.ptr && buffer_is_binary(file2.ptr, file2.size))) {
 327                 *binary = 1;
 328                 if (file1.size)
 329                         free(file1.ptr);
 330                 if (file2.size)
 331                         free(file2.ptr);
 332                 return 0;
 333         }
 334
 335         memset(&diff_params, 0, sizeof(diff_params));
 336         memset(&emit_params, 0, sizeof(emit_params));
 337         memset(&emit_cb, 0, sizeof(emit_cb));
 338         diff_params.flags = XDF_NEED_MINIMAL;
 339         if (ignorews)
 340                 diff_params.flags |= XDF_IGNORE_WHITESPACE;
 341         emit_params.ctxlen = context > 0 ? context : 3;
 342         emit_params.flags = XDL_EMIT_FUNCNAMES;
 343         emit_cb.outf = filediff_cb;
 344         emit_cb.priv = fn;
 345         xdl_diff(&file1, &file2, &diff_params, &emit_params, &emit_cb);
 346         if (file1.size)
 347                 free(file1.ptr);
 348         if (file2.size)
 349                 free(file2.ptr);
 350         return 0;
 351 }
 352
 353 void cgit_diff_tree(const struct object_id *old_oid,
 354                     const struct object_id *new_oid,
 355                     filepair_fn fn, const char *prefix, int ignorews)
 356 {
 357         struct diff_options opt;
 358         struct pathspec_item item;
 359
 360         memset(&item, 0, sizeof(item));
 361         diff_setup(&opt);
 362         opt.output_format = DIFF_FORMAT_CALLBACK;
 363         opt.detect_rename = 1;
 364         opt.rename_limit = ctx.cfg.renamelimit;
 365         DIFF_OPT_SET(&opt, RECURSIVE);
 366         if (ignorews)
 367                 DIFF_XDL_SET(&opt, IGNORE_WHITESPACE);
 368         opt.format_callback = cgit_diff_tree_cb;
 369         opt.format_callback_data = fn;
 370         if (prefix) {
 371                 item.match = prefix;
 372                 item.len = strlen(prefix);
 373                 opt.pathspec.nr = 1;
 374                 opt.pathspec.items = &item;
 375         }
 376         diff_setup_done(&opt);
 377
 378         if (old_oid && !is_null_oid(old_oid))
 379                 diff_tree_sha1(old_oid->hash, new_oid->hash, "", &opt);
 380         else
 381                 diff_root_tree_sha1(new_oid->hash, "", &opt);
 382         diffcore_std(&opt);
 383         diff_flush(&opt);
 384 }
 385
 386 void cgit_diff_commit(struct commit *commit, filepair_fn fn, const char *prefix)
 387 {
 388         const struct object_id *old_oid = NULL;
 389
 390         if (commit->parents)
 391                 old_oid = &commit->parents->item->object.oid;
 392         cgit_diff_tree(old_oid, &commit->object.oid, fn, prefix,
 393                        ctx.qry.ignorews);
 394 }
 395
 396 int cgit_parse_snapshots_mask(const char *str)
 397 {
 398         struct string_list tokens = STRING_LIST_INIT_DUP;
 399         struct string_list_item *item;
 400         const struct cgit_snapshot_format *f;
 401         int rv = 0;
 402
 403         /* favor legacy setting */
 404         if (atoi(str))
 405                 return 1;
 406
 407         string_list_split(&tokens, str, ' ', -1);
 408         string_list_remove_empty_items(&tokens, 0);
 409
 410         for_each_string_list_item(item, &tokens) {
 411                 for (f = cgit_snapshot_formats; f->suffix; f++) {
 412                         if (!strcmp(item->string, f->suffix) ||
 413                             !strcmp(item->string, f->suffix + 1)) {
 414                                 rv |= f->bit;
 415                                 break;
 416                         }
 417                 }
 418         }
 419
 420         string_list_clear(&tokens, 0);
 421         return rv;
 422 }
 423
 424 typedef struct {
 425         char * name;
 426         char * value;
 427 } cgit_env_var;
 428
 429 void cgit_prepare_repo_env(struct cgit_repo * repo)
 430 {
 431         cgit_env_var env_vars[] = {
 432                 { .name = "CGIT_REPO_URL", .value = repo->url },
 433                 { .name = "CGIT_REPO_NAME", .value = repo->name },
 434                 { .name = "CGIT_REPO_PATH", .value = repo->path },
 435                 { .name = "CGIT_REPO_OWNER", .value = repo->owner },
 436                 { .name = "CGIT_REPO_DEFBRANCH", .value = repo->defbranch },
 437                 { .name = "CGIT_REPO_SECTION", .value = repo->section },
 438                 { .name = "CGIT_REPO_CLONE_URL", .value = repo->clone_url }
 439         };
 440         int env_var_count = ARRAY_SIZE(env_vars);
 441         cgit_env_var *p, *q;
 442         static char *warn = "cgit warning: failed to set env: %s=%s\n";
 443
 444         p = env_vars;
 445         q = p + env_var_count;
 446         for (; p < q; p++)
 447                 if (p->value && setenv(p->name, p->value, 1))
 448                         fprintf(stderr, warn, p->name, p->value);
 449 }
 450
 451 /* Read the content of the specified file into a newly allocated buffer,
 452  * zeroterminate the buffer and return 0 on success, errno otherwise.
 453  */
 454 int readfile(const char *path, char **buf, size_t *size)
 455 {
 456         int fd, e;
 457         struct stat st;
 458
 459         fd = open(path, O_RDONLY);
 460         if (fd == -1)
 461                 return errno;
 462         if (fstat(fd, &st)) {
 463                 e = errno;
 464                 close(fd);
 465                 return e;
 466         }
 467         if (!S_ISREG(st.st_mode)) {
 468                 close(fd);
 469                 return EISDIR;
 470         }
 471         *buf = xmalloc(st.st_size + 1);
 472         *size = read_in_full(fd, *buf, st.st_size);
 473         e = errno;
 474         (*buf)[*size] = '\0';
 475         close(fd);
 476         return (*size == st.st_size ? 0 : e);
 477 }
 478
 479 static int is_token_char(char c)
 480 {
 481         return isalnum(c) || c == '_';
 482 }
 483
 484 /* Replace name with getenv(name), return pointer to zero-terminating char
 485  */
 486 static char *expand_macro(char *name, int maxlength)
 487 {
 488         char *value;
 489         int len;
 490
 491         len = 0;
 492         value = getenv(name);
 493         if (value) {
 494                 len = strlen(value);
 495                 if (len > maxlength)
 496                         len = maxlength;
 497                 strncpy(name, value, len);
 498         }
 499         return name + len;
 500 }
 501
 502 #define EXPBUFSIZE (1024 * 8)
 503
 504 /* Replace all tokens prefixed by '$' in the specified text with the
 505  * value of the named environment variable.
 506  * NB: the return value is a static buffer, i.e. it must be strdup'd
 507  * by the caller.
 508  */
 509 char *expand_macros(const char *txt)
 510 {
 511         static char result[EXPBUFSIZE];
 512         char *p, *start;
 513         int len;
 514
 515         p = result;
 516         start = NULL;
 517         while (p < result + EXPBUFSIZE - 1 && txt && *txt) {
 518                 *p = *txt;
 519                 if (start) {
 520                         if (!is_token_char(*txt)) {
 521                                 if (p - start > 0) {
 522                                         *p = '\0';
 523                                         len = result + EXPBUFSIZE - start - 1;
 524                                         p = expand_macro(start, len) - 1;
 525                                 }
 526                                 start = NULL;
 527                                 txt--;
 528                         }
 529                         p++;
 530                         txt++;
 531                         continue;
 532                 }
 533                 if (*txt == '$') {
 534                         start = p;
 535                         txt++;
 536                         continue;
 537                 }
 538                 p++;
 539                 txt++;
 540         }
 541         *p = '\0';
 542         if (start && p - start > 0) {
 543                 len = result + EXPBUFSIZE - start - 1;
 544                 p = expand_macro(start, len);
 545                 *p = '\0';
 546         }
 547         return result;
 548 }
 549
 550 char *get_mimetype_for_filename(const char *filename)
 551 {
 552         char *ext, *mimetype, *token, line[1024], *saveptr;
 553         FILE *file;
 554         struct string_list_item *mime;
 555
 556         if (!filename)
 557                 return NULL;
 558
 559         ext = strrchr(filename, '.');
 560         if (!ext)
 561                 return NULL;
 562         ++ext;
 563         if (!ext[0])
 564                 return NULL;
 565         mime = string_list_lookup(&ctx.cfg.mimetypes, ext);
 566         if (mime)
 567                 return xstrdup(mime->util);
 568
 569         if (!ctx.cfg.mimetype_file)
 570                 return NULL;
 571         file = fopen(ctx.cfg.mimetype_file, "r");
 572         if (!file)
 573                 return NULL;
 574         while (fgets(line, sizeof(line), file)) {
 575                 if (!line[0] || line[0] == '#')
 576                         continue;
 577                 mimetype = strtok_r(line, " \t\r\n", &saveptr);
 578                 while ((token = strtok_r(NULL, " \t\r\n", &saveptr))) {
 579                         if (!strcasecmp(ext, token)) {
 580                                 fclose(file);
 581                                 return xstrdup(mimetype);
 582                         }
 583                 }
 584         }
 585         fclose(file);
 586         return NULL;
 587 }