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 void cgit_add_ref(struct reflist *list, struct refinfo *ref)
 146 {
 147         size_t size;
 148
 149         if (list->count >= list->alloc) {
 150                 list->alloc += (list->alloc ? list->alloc : 4);
 151                 size = list->alloc * sizeof(struct refinfo *);
 152                 list->refs = xrealloc(list->refs, size);
 153         }
 154         list->refs[list->count++] = ref;
 155 }
 156
 157 static struct refinfo *cgit_mk_refinfo(const char *refname, const struct object_id *oid)
 158 {
 159         struct refinfo *ref;
 160
 161         ref = xmalloc(sizeof (struct refinfo));
 162         ref->refname = xstrdup(refname);
 163         ref->object = parse_object(oid);
 164         switch (ref->object->type) {
 165         case OBJ_TAG:
 166                 ref->tag = cgit_parse_tag((struct tag *)ref->object);
 167                 break;
 168         case OBJ_COMMIT:
 169                 ref->commit = cgit_parse_commit((struct commit *)ref->object);
 170                 break;
 171         }
 172         return ref;
 173 }
 174
 175 void cgit_free_taginfo(struct taginfo *tag)
 176 {
 177         if (tag->tagger)
 178                 free(tag->tagger);
 179         if (tag->tagger_email)
 180                 free(tag->tagger_email);
 181         if (tag->msg)
 182                 free(tag->msg);
 183         free(tag);
 184 }
 185
 186 static void cgit_free_refinfo(struct refinfo *ref)
 187 {
 188         if (ref->refname)
 189                 free((char *)ref->refname);
 190         switch (ref->object->type) {
 191         case OBJ_TAG:
 192                 cgit_free_taginfo(ref->tag);
 193                 break;
 194         case OBJ_COMMIT:
 195                 cgit_free_commitinfo(ref->commit);
 196                 break;
 197         }
 198         free(ref);
 199 }
 200
 201 void cgit_free_reflist_inner(struct reflist *list)
 202 {
 203         int i;
 204
 205         for (i = 0; i < list->count; i++) {
 206                 cgit_free_refinfo(list->refs[i]);
 207         }
 208         free(list->refs);
 209 }
 210
 211 int cgit_refs_cb(const char *refname, const struct object_id *oid, int flags,
 212                   void *cb_data)
 213 {
 214         struct reflist *list = (struct reflist *)cb_data;
 215         struct refinfo *info = cgit_mk_refinfo(refname, oid);
 216
 217         if (info)
 218                 cgit_add_ref(list, info);
 219         return 0;
 220 }
 221
 222 void cgit_diff_tree_cb(struct diff_queue_struct *q,
 223                        struct diff_options *options, void *data)
 224 {
 225         int i;
 226
 227         for (i = 0; i < q->nr; i++) {
 228                 if (q->queue[i]->status == 'U')
 229                         continue;
 230                 ((filepair_fn)data)(q->queue[i]);
 231         }
 232 }
 233
 234 static int load_mmfile(mmfile_t *file, const struct object_id *oid)
 235 {
 236         enum object_type type;
 237
 238         if (is_null_oid(oid)) {
 239                 file->ptr = (char *)"";
 240                 file->size = 0;
 241         } else {
 242                 file->ptr = read_sha1_file(oid->hash, &type,
 243                                            (unsigned long *)&file->size);
 244         }
 245         return 1;
 246 }
 247
 248 /*
 249  * Receive diff-buffers from xdiff and concatenate them as
 250  * needed across multiple callbacks.
 251  *
 252  * This is basically a copy of xdiff-interface.c/xdiff_outf(),
 253  * ripped from git and modified to use globals instead of
 254  * a special callback-struct.
 255  */
 256 static char *diffbuf = NULL;
 257 static int buflen = 0;
 258
 259 static int filediff_cb(void *priv, mmbuffer_t *mb, int nbuf)
 260 {
 261         int i;
 262
 263         for (i = 0; i < nbuf; i++) {
 264                 if (mb[i].ptr[mb[i].size-1] != '\n') {
 265                         /* Incomplete line */
 266                         diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
 267                         memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
 268                         buflen += mb[i].size;
 269                         continue;
 270                 }
 271
 272                 /* we have a complete line */
 273                 if (!diffbuf) {
 274                         ((linediff_fn)priv)(mb[i].ptr, mb[i].size);
 275                         continue;
 276                 }
 277                 diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
 278                 memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
 279                 ((linediff_fn)priv)(diffbuf, buflen + mb[i].size);
 280                 free(diffbuf);
 281                 diffbuf = NULL;
 282                 buflen = 0;
 283         }
 284         if (diffbuf) {
 285                 ((linediff_fn)priv)(diffbuf, buflen);
 286                 free(diffbuf);
 287                 diffbuf = NULL;
 288                 buflen = 0;
 289         }
 290         return 0;
 291 }
 292
 293 int cgit_diff_files(const struct object_id *old_oid,
 294                     const struct object_id *new_oid, unsigned long *old_size,
 295                     unsigned long *new_size, int *binary, int context,
 296                     int ignorews, linediff_fn fn)
 297 {
 298         mmfile_t file1, file2;
 299         xpparam_t diff_params;
 300         xdemitconf_t emit_params;
 301         xdemitcb_t emit_cb;
 302
 303         if (!load_mmfile(&file1, old_oid) || !load_mmfile(&file2, new_oid))
 304                 return 1;
 305
 306         *old_size = file1.size;
 307         *new_size = file2.size;
 308
 309         if ((file1.ptr && buffer_is_binary(file1.ptr, file1.size)) ||
 310             (file2.ptr && buffer_is_binary(file2.ptr, file2.size))) {
 311                 *binary = 1;
 312                 if (file1.size)
 313                         free(file1.ptr);
 314                 if (file2.size)
 315                         free(file2.ptr);
 316                 return 0;
 317         }
 318
 319         memset(&diff_params, 0, sizeof(diff_params));
 320         memset(&emit_params, 0, sizeof(emit_params));
 321         memset(&emit_cb, 0, sizeof(emit_cb));
 322         diff_params.flags = XDF_NEED_MINIMAL;
 323         if (ignorews)
 324                 diff_params.flags |= XDF_IGNORE_WHITESPACE;
 325         emit_params.ctxlen = context > 0 ? context : 3;
 326         emit_params.flags = XDL_EMIT_FUNCNAMES;
 327         emit_cb.outf = filediff_cb;
 328         emit_cb.priv = fn;
 329         xdl_diff(&file1, &file2, &diff_params, &emit_params, &emit_cb);
 330         if (file1.size)
 331                 free(file1.ptr);
 332         if (file2.size)
 333                 free(file2.ptr);
 334         return 0;
 335 }
 336
 337 void cgit_diff_tree(const struct object_id *old_oid,
 338                     const struct object_id *new_oid,
 339                     filepair_fn fn, const char *prefix, int ignorews)
 340 {
 341         struct diff_options opt;
 342         struct pathspec_item item;
 343
 344         memset(&item, 0, sizeof(item));
 345         diff_setup(&opt);
 346         opt.output_format = DIFF_FORMAT_CALLBACK;
 347         opt.detect_rename = 1;
 348         opt.rename_limit = ctx.cfg.renamelimit;
 349         opt.flags.recursive = 1;
 350         if (ignorews)
 351                 DIFF_XDL_SET(&opt, IGNORE_WHITESPACE);
 352         opt.format_callback = cgit_diff_tree_cb;
 353         opt.format_callback_data = fn;
 354         if (prefix) {
 355                 item.match = xstrdup(prefix);
 356                 item.len = strlen(prefix);
 357                 opt.pathspec.nr = 1;
 358                 opt.pathspec.items = &item;
 359         }
 360         diff_setup_done(&opt);
 361
 362         if (old_oid && !is_null_oid(old_oid))
 363                 diff_tree_oid(old_oid, new_oid, "", &opt);
 364         else
 365                 diff_root_tree_oid(new_oid, "", &opt);
 366         diffcore_std(&opt);
 367         diff_flush(&opt);
 368
 369         free(item.match);
 370 }
 371
 372 void cgit_diff_commit(struct commit *commit, filepair_fn fn, const char *prefix)
 373 {
 374         const struct object_id *old_oid = NULL;
 375
 376         if (commit->parents)
 377                 old_oid = &commit->parents->item->object.oid;
 378         cgit_diff_tree(old_oid, &commit->object.oid, fn, prefix,
 379                        ctx.qry.ignorews);
 380 }
 381
 382 int cgit_parse_snapshots_mask(const char *str)
 383 {
 384         struct string_list tokens = STRING_LIST_INIT_DUP;
 385         struct string_list_item *item;
 386         const struct cgit_snapshot_format *f;
 387         int rv = 0;
 388
 389         /* favor legacy setting */
 390         if (atoi(str))
 391                 return 1;
 392
 393         if (strcmp(str, "all") == 0)
 394                 return INT_MAX;
 395
 396         string_list_split(&tokens, str, ' ', -1);
 397         string_list_remove_empty_items(&tokens, 0);
 398
 399         for_each_string_list_item(item, &tokens) {
 400                 for (f = cgit_snapshot_formats; f->suffix; f++) {
 401                         if (!strcmp(item->string, f->suffix) ||
 402                             !strcmp(item->string, f->suffix + 1)) {
 403                                 rv |= f->bit;
 404                                 break;
 405                         }
 406                 }
 407         }
 408
 409         string_list_clear(&tokens, 0);
 410         return rv;
 411 }
 412
 413 typedef struct {
 414         char * name;
 415         char * value;
 416 } cgit_env_var;
 417
 418 void cgit_prepare_repo_env(struct cgit_repo * repo)
 419 {
 420         cgit_env_var env_vars[] = {
 421                 { .name = "CGIT_REPO_URL", .value = repo->url },
 422                 { .name = "CGIT_REPO_NAME", .value = repo->name },
 423                 { .name = "CGIT_REPO_PATH", .value = repo->path },
 424                 { .name = "CGIT_REPO_OWNER", .value = repo->owner },
 425                 { .name = "CGIT_REPO_DEFBRANCH", .value = repo->defbranch },
 426                 { .name = "CGIT_REPO_SECTION", .value = repo->section },
 427                 { .name = "CGIT_REPO_CLONE_URL", .value = repo->clone_url }
 428         };
 429         int env_var_count = ARRAY_SIZE(env_vars);
 430         cgit_env_var *p, *q;
 431         static char *warn = "cgit warning: failed to set env: %s=%s\n";
 432
 433         p = env_vars;
 434         q = p + env_var_count;
 435         for (; p < q; p++)
 436                 if (p->value && setenv(p->name, p->value, 1))
 437                         fprintf(stderr, warn, p->name, p->value);
 438 }
 439
 440 /* Read the content of the specified file into a newly allocated buffer,
 441  * zeroterminate the buffer and return 0 on success, errno otherwise.
 442  */
 443 int readfile(const char *path, char **buf, size_t *size)
 444 {
 445         int fd, e;
 446         struct stat st;
 447
 448         fd = open(path, O_RDONLY);
 449         if (fd == -1)
 450                 return errno;
 451         if (fstat(fd, &st)) {
 452                 e = errno;
 453                 close(fd);
 454                 return e;
 455         }
 456         if (!S_ISREG(st.st_mode)) {
 457                 close(fd);
 458                 return EISDIR;
 459         }
 460         *buf = xmalloc(st.st_size + 1);
 461         *size = read_in_full(fd, *buf, st.st_size);
 462         e = errno;
 463         (*buf)[*size] = '\0';
 464         close(fd);
 465         return (*size == st.st_size ? 0 : e);
 466 }
 467
 468 static int is_token_char(char c)
 469 {
 470         return isalnum(c) || c == '_';
 471 }
 472
 473 /* Replace name with getenv(name), return pointer to zero-terminating char
 474  */
 475 static char *expand_macro(char *name, int maxlength)
 476 {
 477         char *value;
 478         int len;
 479
 480         len = 0;
 481         value = getenv(name);
 482         if (value) {
 483                 len = strlen(value);
 484                 if (len > maxlength)
 485                         len = maxlength;
 486                 strncpy(name, value, len);
 487         }
 488         return name + len;
 489 }
 490
 491 #define EXPBUFSIZE (1024 * 8)
 492
 493 /* Replace all tokens prefixed by '$' in the specified text with the
 494  * value of the named environment variable.
 495  * NB: the return value is a static buffer, i.e. it must be strdup'd
 496  * by the caller.
 497  */
 498 char *expand_macros(const char *txt)
 499 {
 500         static char result[EXPBUFSIZE];
 501         char *p, *start;
 502         int len;
 503
 504         p = result;
 505         start = NULL;
 506         while (p < result + EXPBUFSIZE - 1 && txt && *txt) {
 507                 *p = *txt;
 508                 if (start) {
 509                         if (!is_token_char(*txt)) {
 510                                 if (p - start > 0) {
 511                                         *p = '\0';
 512                                         len = result + EXPBUFSIZE - start - 1;
 513                                         p = expand_macro(start, len) - 1;
 514                                 }
 515                                 start = NULL;
 516                                 txt--;
 517                         }
 518                         p++;
 519                         txt++;
 520                         continue;
 521                 }
 522                 if (*txt == '$') {
 523                         start = p;
 524                         txt++;
 525                         continue;
 526                 }
 527                 p++;
 528                 txt++;
 529         }
 530         *p = '\0';
 531         if (start && p - start > 0) {
 532                 len = result + EXPBUFSIZE - start - 1;
 533                 p = expand_macro(start, len);
 534                 *p = '\0';
 535         }
 536         return result;
 537 }
 538
 539 char *get_mimetype_for_filename(const char *filename)
 540 {
 541         char *ext, *mimetype, *token, line[1024], *saveptr;
 542         FILE *file;
 543         struct string_list_item *mime;
 544
 545         if (!filename)
 546                 return NULL;
 547
 548         ext = strrchr(filename, '.');
 549         if (!ext)
 550                 return NULL;
 551         ++ext;
 552         if (!ext[0])
 553                 return NULL;
 554         mime = string_list_lookup(&ctx.cfg.mimetypes, ext);
 555         if (mime)
 556                 return xstrdup(mime->util);
 557
 558         if (!ctx.cfg.mimetype_file)
 559                 return NULL;
 560         file = fopen(ctx.cfg.mimetype_file, "r");
 561         if (!file)
 562                 return NULL;
 563         while (fgets(line, sizeof(line), file)) {
 564                 if (!line[0] || line[0] == '#')
 565                         continue;
 566                 mimetype = strtok_r(line, " \t\r\n", &saveptr);
 567                 while ((token = strtok_r(NULL, " \t\r\n", &saveptr))) {
 568                         if (!strcasecmp(ext, token)) {
 569                                 fclose(file);
 570                                 return xstrdup(mimetype);
 571                         }
 572                 }
 573         }
 574         fclose(file);
 575         return NULL;
 576 }