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->section = ctx.cfg.section;
  58         ret->snapshots = ctx.cfg.snapshots;
  59         ret->enable_commit_graph = ctx.cfg.enable_commit_graph;
  60         ret->enable_log_filecount = ctx.cfg.enable_log_filecount;
  61         ret->enable_log_linecount = ctx.cfg.enable_log_linecount;
  62         ret->enable_remote_branches = ctx.cfg.enable_remote_branches;
  63         ret->enable_subject_links = ctx.cfg.enable_subject_links;
  64         ret->max_stats = ctx.cfg.max_stats;
  65         ret->branch_sort = ctx.cfg.branch_sort;
  66         ret->commit_sort = ctx.cfg.commit_sort;
  67         ret->module_link = ctx.cfg.module_link;
  68         ret->readme = ctx.cfg.readme;
  69         ret->mtime = -1;
  70         ret->about_filter = ctx.cfg.about_filter;
  71         ret->commit_filter = ctx.cfg.commit_filter;
  72         ret->source_filter = ctx.cfg.source_filter;
  73         ret->email_filter = ctx.cfg.email_filter;
  74         ret->owner_filter = ctx.cfg.owner_filter;
  75         ret->clone_url = ctx.cfg.clone_url;
  76         ret->submodules.strdup_strings = 1;
  77         ret->hide = ret->ignore = 0;
  78         return ret;
  79 }
  80
  81 struct cgit_repo *cgit_get_repoinfo(const char *url)
  82 {
  83         int i;
  84         struct cgit_repo *repo;
  85
  86         for (i = 0; i < cgit_repolist.count; i++) {
  87                 repo = &cgit_repolist.repos[i];
  88                 if (repo->ignore)
  89                         continue;
  90                 if (!strcmp(repo->url, url))
  91                         return repo;
  92         }
  93         return NULL;
  94 }
  95
  96 void *cgit_free_commitinfo(struct commitinfo *info)
  97 {
  98         free(info->author);
  99         free(info->author_email);
 100         free(info->committer);
 101         free(info->committer_email);
 102         free(info->subject);
 103         free(info->msg);
 104         free(info->msg_encoding);
 105         free(info);
 106         return NULL;
 107 }
 108
 109 char *trim_end(const char *str, char c)
 110 {
 111         int len;
 112
 113         if (str == NULL)
 114                 return NULL;
 115         len = strlen(str);
 116         while (len > 0 && str[len - 1] == c)
 117                 len--;
 118         if (len == 0)
 119                 return NULL;
 120         return xstrndup(str, len);
 121 }
 122
 123 char *ensure_end(const char *str, char c)
 124 {
 125         size_t len = strlen(str);
 126         char *result;
 127
 128         if (len && str[len - 1] == c)
 129                 return xstrndup(str, len);
 130
 131         result = xmalloc(len + 2);
 132         memcpy(result, str, len);
 133         result[len] = '/';
 134         result[len + 1] = '\0';
 135         return result;
 136 }
 137
 138 void strbuf_ensure_end(struct strbuf *sb, char c)
 139 {
 140         if (!sb->len || sb->buf[sb->len - 1] != c)
 141                 strbuf_addch(sb, c);
 142 }
 143
 144 char *strlpart(char *txt, int maxlen)
 145 {
 146         char *result;
 147
 148         if (!txt)
 149                 return txt;
 150
 151         if (strlen(txt) <= maxlen)
 152                 return txt;
 153         result = xmalloc(maxlen + 1);
 154         memcpy(result, txt, maxlen - 3);
 155         result[maxlen-1] = result[maxlen-2] = result[maxlen-3] = '.';
 156         result[maxlen] = '\0';
 157         return result;
 158 }
 159
 160 char *strrpart(char *txt, int maxlen)
 161 {
 162         char *result;
 163
 164         if (!txt)
 165                 return txt;
 166
 167         if (strlen(txt) <= maxlen)
 168                 return txt;
 169         result = xmalloc(maxlen + 1);
 170         memcpy(result + 3, txt + strlen(txt) - maxlen + 4, maxlen - 3);
 171         result[0] = result[1] = result[2] = '.';
 172         return result;
 173 }
 174
 175 void cgit_add_ref(struct reflist *list, struct refinfo *ref)
 176 {
 177         size_t size;
 178
 179         if (list->count >= list->alloc) {
 180                 list->alloc += (list->alloc ? list->alloc : 4);
 181                 size = list->alloc * sizeof(struct refinfo *);
 182                 list->refs = xrealloc(list->refs, size);
 183         }
 184         list->refs[list->count++] = ref;
 185 }
 186
 187 static struct refinfo *cgit_mk_refinfo(const char *refname, const struct object_id *oid)
 188 {
 189         struct refinfo *ref;
 190
 191         ref = xmalloc(sizeof (struct refinfo));
 192         ref->refname = xstrdup(refname);
 193         ref->object = parse_object(oid->hash);
 194         switch (ref->object->type) {
 195         case OBJ_TAG:
 196                 ref->tag = cgit_parse_tag((struct tag *)ref->object);
 197                 break;
 198         case OBJ_COMMIT:
 199                 ref->commit = cgit_parse_commit((struct commit *)ref->object);
 200                 break;
 201         }
 202         return ref;
 203 }
 204
 205 static void cgit_free_taginfo(struct taginfo *tag)
 206 {
 207         if (tag->tagger)
 208                 free(tag->tagger);
 209         if (tag->tagger_email)
 210                 free(tag->tagger_email);
 211         if (tag->msg)
 212                 free(tag->msg);
 213         free(tag);
 214 }
 215
 216 static void cgit_free_refinfo(struct refinfo *ref)
 217 {
 218         if (ref->refname)
 219                 free((char *)ref->refname);
 220         switch (ref->object->type) {
 221         case OBJ_TAG:
 222                 cgit_free_taginfo(ref->tag);
 223                 break;
 224         case OBJ_COMMIT:
 225                 cgit_free_commitinfo(ref->commit);
 226                 break;
 227         }
 228         free(ref);
 229 }
 230
 231 void cgit_free_reflist_inner(struct reflist *list)
 232 {
 233         int i;
 234
 235         for (i = 0; i < list->count; i++) {
 236                 cgit_free_refinfo(list->refs[i]);
 237         }
 238         free(list->refs);
 239 }
 240
 241 int cgit_refs_cb(const char *refname, const struct object_id *oid, int flags,
 242                   void *cb_data)
 243 {
 244         struct reflist *list = (struct reflist *)cb_data;
 245         struct refinfo *info = cgit_mk_refinfo(refname, oid);
 246
 247         if (info)
 248                 cgit_add_ref(list, info);
 249         return 0;
 250 }
 251
 252 void cgit_diff_tree_cb(struct diff_queue_struct *q,
 253                        struct diff_options *options, void *data)
 254 {
 255         int i;
 256
 257         for (i = 0; i < q->nr; i++) {
 258                 if (q->queue[i]->status == 'U')
 259                         continue;
 260                 ((filepair_fn)data)(q->queue[i]);
 261         }
 262 }
 263
 264 static int load_mmfile(mmfile_t *file, const unsigned char *sha1)
 265 {
 266         enum object_type type;
 267
 268         if (is_null_sha1(sha1)) {
 269                 file->ptr = (char *)"";
 270                 file->size = 0;
 271         } else {
 272                 file->ptr = read_sha1_file(sha1, &type,
 273                                            (unsigned long *)&file->size);
 274         }
 275         return 1;
 276 }
 277
 278 /*
 279  * Receive diff-buffers from xdiff and concatenate them as
 280  * needed across multiple callbacks.
 281  *
 282  * This is basically a copy of xdiff-interface.c/xdiff_outf(),
 283  * ripped from git and modified to use globals instead of
 284  * a special callback-struct.
 285  */
 286 static char *diffbuf = NULL;
 287 static int buflen = 0;
 288
 289 static int filediff_cb(void *priv, mmbuffer_t *mb, int nbuf)
 290 {
 291         int i;
 292
 293         for (i = 0; i < nbuf; i++) {
 294                 if (mb[i].ptr[mb[i].size-1] != '\n') {
 295                         /* Incomplete line */
 296                         diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
 297                         memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
 298                         buflen += mb[i].size;
 299                         continue;
 300                 }
 301
 302                 /* we have a complete line */
 303                 if (!diffbuf) {
 304                         ((linediff_fn)priv)(mb[i].ptr, mb[i].size);
 305                         continue;
 306                 }
 307                 diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
 308                 memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
 309                 ((linediff_fn)priv)(diffbuf, buflen + mb[i].size);
 310                 free(diffbuf);
 311                 diffbuf = NULL;
 312                 buflen = 0;
 313         }
 314         if (diffbuf) {
 315                 ((linediff_fn)priv)(diffbuf, buflen);
 316                 free(diffbuf);
 317                 diffbuf = NULL;
 318                 buflen = 0;
 319         }
 320         return 0;
 321 }
 322
 323 int cgit_diff_files(const unsigned char *old_sha1,
 324                     const unsigned char *new_sha1, unsigned long *old_size,
 325                     unsigned long *new_size, int *binary, int context,
 326                     int ignorews, linediff_fn fn)
 327 {
 328         mmfile_t file1, file2;
 329         xpparam_t diff_params;
 330         xdemitconf_t emit_params;
 331         xdemitcb_t emit_cb;
 332
 333         if (!load_mmfile(&file1, old_sha1) || !load_mmfile(&file2, new_sha1))
 334                 return 1;
 335
 336         *old_size = file1.size;
 337         *new_size = file2.size;
 338
 339         if ((file1.ptr && buffer_is_binary(file1.ptr, file1.size)) ||
 340             (file2.ptr && buffer_is_binary(file2.ptr, file2.size))) {
 341                 *binary = 1;
 342                 if (file1.size)
 343                         free(file1.ptr);
 344                 if (file2.size)
 345                         free(file2.ptr);
 346                 return 0;
 347         }
 348
 349         memset(&diff_params, 0, sizeof(diff_params));
 350         memset(&emit_params, 0, sizeof(emit_params));
 351         memset(&emit_cb, 0, sizeof(emit_cb));
 352         diff_params.flags = XDF_NEED_MINIMAL;
 353         if (ignorews)
 354                 diff_params.flags |= XDF_IGNORE_WHITESPACE;
 355         emit_params.ctxlen = context > 0 ? context : 3;
 356         emit_params.flags = XDL_EMIT_FUNCNAMES;
 357         emit_cb.outf = filediff_cb;
 358         emit_cb.priv = fn;
 359         xdl_diff(&file1, &file2, &diff_params, &emit_params, &emit_cb);
 360         if (file1.size)
 361                 free(file1.ptr);
 362         if (file2.size)
 363                 free(file2.ptr);
 364         return 0;
 365 }
 366
 367 void cgit_diff_tree(const unsigned char *old_sha1,
 368                     const unsigned char *new_sha1,
 369                     filepair_fn fn, const char *prefix, int ignorews)
 370 {
 371         struct diff_options opt;
 372         struct pathspec_item item;
 373
 374         memset(&item, 0, sizeof(item));
 375         diff_setup(&opt);
 376         opt.output_format = DIFF_FORMAT_CALLBACK;
 377         opt.detect_rename = 1;
 378         opt.rename_limit = ctx.cfg.renamelimit;
 379         DIFF_OPT_SET(&opt, RECURSIVE);
 380         if (ignorews)
 381                 DIFF_XDL_SET(&opt, IGNORE_WHITESPACE);
 382         opt.format_callback = cgit_diff_tree_cb;
 383         opt.format_callback_data = fn;
 384         if (prefix) {
 385                 item.match = prefix;
 386                 item.len = strlen(prefix);
 387                 opt.pathspec.nr = 1;
 388                 opt.pathspec.items = &item;
 389         }
 390         diff_setup_done(&opt);
 391
 392         if (old_sha1 && !is_null_sha1(old_sha1))
 393                 diff_tree_sha1(old_sha1, new_sha1, "", &opt);
 394         else
 395                 diff_root_tree_sha1(new_sha1, "", &opt);
 396         diffcore_std(&opt);
 397         diff_flush(&opt);
 398 }
 399
 400 void cgit_diff_commit(struct commit *commit, filepair_fn fn, const char *prefix)
 401 {
 402         unsigned char *old_sha1 = NULL;
 403
 404         if (commit->parents)
 405                 old_sha1 = commit->parents->item->object.sha1;
 406         cgit_diff_tree(old_sha1, commit->object.sha1, fn, prefix,
 407                        ctx.qry.ignorews);
 408 }
 409
 410 int cgit_parse_snapshots_mask(const char *str)
 411 {
 412         struct string_list tokens = STRING_LIST_INIT_DUP;
 413         struct string_list_item *item;
 414         const struct cgit_snapshot_format *f;
 415         int rv = 0;
 416
 417         /* favor legacy setting */
 418         if (atoi(str))
 419                 return 1;
 420
 421         string_list_split(&tokens, str, ' ', -1);
 422         string_list_remove_empty_items(&tokens, 0);
 423
 424         for_each_string_list_item(item, &tokens) {
 425                 for (f = cgit_snapshot_formats; f->suffix; f++) {
 426                         if (!strcmp(item->string, f->suffix) ||
 427                             !strcmp(item->string, f->suffix + 1)) {
 428                                 rv |= f->bit;
 429                                 break;
 430                         }
 431                 }
 432         }
 433
 434         string_list_clear(&tokens, 0);
 435         return rv;
 436 }
 437
 438 typedef struct {
 439         char * name;
 440         char * value;
 441 } cgit_env_var;
 442
 443 void cgit_prepare_repo_env(struct cgit_repo * repo)
 444 {
 445         cgit_env_var env_vars[] = {
 446                 { .name = "CGIT_REPO_URL", .value = repo->url },
 447                 { .name = "CGIT_REPO_NAME", .value = repo->name },
 448                 { .name = "CGIT_REPO_PATH", .value = repo->path },
 449                 { .name = "CGIT_REPO_OWNER", .value = repo->owner },
 450                 { .name = "CGIT_REPO_DEFBRANCH", .value = repo->defbranch },
 451                 { .name = "CGIT_REPO_SECTION", .value = repo->section },
 452                 { .name = "CGIT_REPO_CLONE_URL", .value = repo->clone_url }
 453         };
 454         int env_var_count = ARRAY_SIZE(env_vars);
 455         cgit_env_var *p, *q;
 456         static char *warn = "cgit warning: failed to set env: %s=%s\n";
 457
 458         p = env_vars;
 459         q = p + env_var_count;
 460         for (; p < q; p++)
 461                 if (p->value && setenv(p->name, p->value, 1))
 462                         fprintf(stderr, warn, p->name, p->value);
 463 }
 464
 465 /* Read the content of the specified file into a newly allocated buffer,
 466  * zeroterminate the buffer and return 0 on success, errno otherwise.
 467  */
 468 int readfile(const char *path, char **buf, size_t *size)
 469 {
 470         int fd, e;
 471         struct stat st;
 472
 473         fd = open(path, O_RDONLY);
 474         if (fd == -1)
 475                 return errno;
 476         if (fstat(fd, &st)) {
 477                 e = errno;
 478                 close(fd);
 479                 return e;
 480         }
 481         if (!S_ISREG(st.st_mode)) {
 482                 close(fd);
 483                 return EISDIR;
 484         }
 485         *buf = xmalloc(st.st_size + 1);
 486         *size = read_in_full(fd, *buf, st.st_size);
 487         e = errno;
 488         (*buf)[*size] = '\0';
 489         close(fd);
 490         return (*size == st.st_size ? 0 : e);
 491 }
 492
 493 static int is_token_char(char c)
 494 {
 495         return isalnum(c) || c == '_';
 496 }
 497
 498 /* Replace name with getenv(name), return pointer to zero-terminating char
 499  */
 500 static char *expand_macro(char *name, int maxlength)
 501 {
 502         char *value;
 503         int len;
 504
 505         len = 0;
 506         value = getenv(name);
 507         if (value) {
 508                 len = strlen(value);
 509                 if (len > maxlength)
 510                         len = maxlength;
 511                 strncpy(name, value, len);
 512         }
 513         return name + len;
 514 }
 515
 516 #define EXPBUFSIZE (1024 * 8)
 517
 518 /* Replace all tokens prefixed by '$' in the specified text with the
 519  * value of the named environment variable.
 520  * NB: the return value is a static buffer, i.e. it must be strdup'd
 521  * by the caller.
 522  */
 523 char *expand_macros(const char *txt)
 524 {
 525         static char result[EXPBUFSIZE];
 526         char *p, *start;
 527         int len;
 528
 529         p = result;
 530         start = NULL;
 531         while (p < result + EXPBUFSIZE - 1 && txt && *txt) {
 532                 *p = *txt;
 533                 if (start) {
 534                         if (!is_token_char(*txt)) {
 535                                 if (p - start > 0) {
 536                                         *p = '\0';
 537                                         len = result + EXPBUFSIZE - start - 1;
 538                                         p = expand_macro(start, len) - 1;
 539                                 }
 540                                 start = NULL;
 541                                 txt--;
 542                         }
 543                         p++;
 544                         txt++;
 545                         continue;
 546                 }
 547                 if (*txt == '$') {
 548                         start = p;
 549                         txt++;
 550                         continue;
 551                 }
 552                 p++;
 553                 txt++;
 554         }
 555         *p = '\0';
 556         if (start && p - start > 0) {
 557                 len = result + EXPBUFSIZE - start - 1;
 558                 p = expand_macro(start, len);
 559                 *p = '\0';
 560         }
 561         return result;
 562 }