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 #include <stdio.h>
  11
  12 struct cgit_repolist cgit_repolist;
  13 struct cgit_context ctx;
  14
  15 int chk_zero(int result, char *msg)
  16 {
  17         if (result != 0)
  18                 die_errno("%s", msg);
  19         return result;
  20 }
  21
  22 int chk_positive(int result, char *msg)
  23 {
  24         if (result <= 0)
  25                 die_errno("%s", msg);
  26         return result;
  27 }
  28
  29 int chk_non_negative(int result, char *msg)
  30 {
  31         if (result < 0)
  32                 die_errno("%s", msg);
  33         return result;
  34 }
  35
  36 char *cgit_default_repo_desc = "[no description]";
  37 struct cgit_repo *cgit_add_repo(const char *url)
  38 {
  39         struct cgit_repo *ret;
  40
  41         if (++cgit_repolist.count > cgit_repolist.length) {
  42                 if (cgit_repolist.length == 0)
  43                         cgit_repolist.length = 8;
  44                 else
  45                         cgit_repolist.length *= 2;
  46                 cgit_repolist.repos = xrealloc(cgit_repolist.repos,
  47                                                cgit_repolist.length *
  48                                                sizeof(struct cgit_repo));
  49         }
  50
  51         ret = &cgit_repolist.repos[cgit_repolist.count-1];
  52         memset(ret, 0, sizeof(struct cgit_repo));
  53         ret->url = trim_end(url, '/');
  54         ret->name = ret->url;
  55         ret->path = NULL;
  56         ret->desc = cgit_default_repo_desc;
  57         ret->owner = 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->max_stats = ctx.cfg.max_stats;
  66         ret->branch_sort = ctx.cfg.branch_sort;
  67         ret->commit_sort = ctx.cfg.commit_sort;
  68         ret->module_link = ctx.cfg.module_link;
  69         ret->readme = ctx.cfg.readme;
  70         ret->mtime = -1;
  71         ret->about_filter = ctx.cfg.about_filter;
  72         ret->commit_filter = ctx.cfg.commit_filter;
  73         ret->source_filter = ctx.cfg.source_filter;
  74         ret->email_filter = ctx.cfg.email_filter;
  75         ret->owner_filter = ctx.cfg.owner_filter;
  76         ret->clone_url = ctx.cfg.clone_url;
  77         ret->submodules.strdup_strings = 1;
  78         ret->hide = ret->ignore = 0;
  79         return ret;
  80 }
  81
  82 struct cgit_repo *cgit_get_repoinfo(const char *url)
  83 {
  84         int i;
  85         struct cgit_repo *repo;
  86
  87         for (i = 0; i < cgit_repolist.count; i++) {
  88                 repo = &cgit_repolist.repos[i];
  89                 if (repo->ignore)
  90                         continue;
  91                 if (!strcmp(repo->url, url))
  92                         return repo;
  93         }
  94         return NULL;
  95 }
  96
  97 void *cgit_free_commitinfo(struct commitinfo *info)
  98 {
  99         free(info->author);
 100         free(info->author_email);
 101         free(info->committer);
 102         free(info->committer_email);
 103         free(info->subject);
 104         free(info->msg);
 105         free(info->msg_encoding);
 106         free(info);
 107         return NULL;
 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 char *strrpart(char *txt, int maxlen)
 162 {
 163         char *result;
 164
 165         if (!txt)
 166                 return txt;
 167
 168         if (strlen(txt) <= maxlen)
 169                 return txt;
 170         result = xmalloc(maxlen + 1);
 171         memcpy(result + 3, txt + strlen(txt) - maxlen + 4, maxlen - 3);
 172         result[0] = result[1] = result[2] = '.';
 173         return result;
 174 }
 175
 176 void cgit_add_ref(struct reflist *list, struct refinfo *ref)
 177 {
 178         size_t size;
 179
 180         if (list->count >= list->alloc) {
 181                 list->alloc += (list->alloc ? list->alloc : 4);
 182                 size = list->alloc * sizeof(struct refinfo *);
 183                 list->refs = xrealloc(list->refs, size);
 184         }
 185         list->refs[list->count++] = ref;
 186 }
 187
 188 static struct refinfo *cgit_mk_refinfo(const char *refname, const unsigned char *sha1)
 189 {
 190         struct refinfo *ref;
 191
 192         ref = xmalloc(sizeof (struct refinfo));
 193         ref->refname = xstrdup(refname);
 194         ref->object = parse_object(sha1);
 195         switch (ref->object->type) {
 196         case OBJ_TAG:
 197                 ref->tag = cgit_parse_tag((struct tag *)ref->object);
 198                 break;
 199         case OBJ_COMMIT:
 200                 ref->commit = cgit_parse_commit((struct commit *)ref->object);
 201                 break;
 202         }
 203         return ref;
 204 }
 205
 206 static void cgit_free_taginfo(struct taginfo *tag)
 207 {
 208         if (tag->tagger)
 209                 free(tag->tagger);
 210         if (tag->tagger_email)
 211                 free(tag->tagger_email);
 212         if (tag->msg)
 213                 free(tag->msg);
 214         free(tag);
 215 }
 216
 217 static void cgit_free_refinfo(struct refinfo *ref)
 218 {
 219         if (ref->refname)
 220                 free((char *)ref->refname);
 221         switch (ref->object->type) {
 222         case OBJ_TAG:
 223                 cgit_free_taginfo(ref->tag);
 224                 break;
 225         case OBJ_COMMIT:
 226                 cgit_free_commitinfo(ref->commit);
 227                 break;
 228         }
 229         free(ref);
 230 }
 231
 232 void cgit_free_reflist_inner(struct reflist *list)
 233 {
 234         int i;
 235
 236         for (i = 0; i < list->count; i++) {
 237                 cgit_free_refinfo(list->refs[i]);
 238         }
 239         free(list->refs);
 240 }
 241
 242 int cgit_refs_cb(const char *refname, const unsigned char *sha1, int flags,
 243                   void *cb_data)
 244 {
 245         struct reflist *list = (struct reflist *)cb_data;
 246         struct refinfo *info = cgit_mk_refinfo(refname, sha1);
 247
 248         if (info)
 249                 cgit_add_ref(list, info);
 250         return 0;
 251 }
 252
 253 static void cgit_diff_tree_cb(struct diff_queue_struct *q,
 254                               struct diff_options *options, void *data)
 255 {
 256         int i;
 257
 258         for (i = 0; i < q->nr; i++) {
 259                 if (q->queue[i]->status == 'U')
 260                         continue;
 261                 ((filepair_fn)data)(q->queue[i]);
 262         }
 263 }
 264
 265 static int load_mmfile(mmfile_t *file, const unsigned char *sha1)
 266 {
 267         enum object_type type;
 268
 269         if (is_null_sha1(sha1)) {
 270                 file->ptr = (char *)"";
 271                 file->size = 0;
 272         } else {
 273                 file->ptr = read_sha1_file(sha1, &type,
 274                                            (unsigned long *)&file->size);
 275         }
 276         return 1;
 277 }
 278
 279 /*
 280  * Receive diff-buffers from xdiff and concatenate them as
 281  * needed across multiple callbacks.
 282  *
 283  * This is basically a copy of xdiff-interface.c/xdiff_outf(),
 284  * ripped from git and modified to use globals instead of
 285  * a special callback-struct.
 286  */
 287 char *diffbuf = NULL;
 288 int buflen = 0;
 289
 290 static int filediff_cb(void *priv, mmbuffer_t *mb, int nbuf)
 291 {
 292         int i;
 293
 294         for (i = 0; i < nbuf; i++) {
 295                 if (mb[i].ptr[mb[i].size-1] != '\n') {
 296                         /* Incomplete line */
 297                         diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
 298                         memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
 299                         buflen += mb[i].size;
 300                         continue;
 301                 }
 302
 303                 /* we have a complete line */
 304                 if (!diffbuf) {
 305                         ((linediff_fn)priv)(mb[i].ptr, mb[i].size);
 306                         continue;
 307                 }
 308                 diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
 309                 memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
 310                 ((linediff_fn)priv)(diffbuf, buflen + mb[i].size);
 311                 free(diffbuf);
 312                 diffbuf = NULL;
 313                 buflen = 0;
 314         }
 315         if (diffbuf) {
 316                 ((linediff_fn)priv)(diffbuf, buflen);
 317                 free(diffbuf);
 318                 diffbuf = NULL;
 319                 buflen = 0;
 320         }
 321         return 0;
 322 }
 323
 324 int cgit_diff_files(const unsigned char *old_sha1,
 325                     const unsigned char *new_sha1, unsigned long *old_size,
 326                     unsigned long *new_size, int *binary, int context,
 327                     int ignorews, linediff_fn fn)
 328 {
 329         mmfile_t file1, file2;
 330         xpparam_t diff_params;
 331         xdemitconf_t emit_params;
 332         xdemitcb_t emit_cb;
 333
 334         if (!load_mmfile(&file1, old_sha1) || !load_mmfile(&file2, new_sha1))
 335                 return 1;
 336
 337         *old_size = file1.size;
 338         *new_size = file2.size;
 339
 340         if ((file1.ptr && buffer_is_binary(file1.ptr, file1.size)) ||
 341             (file2.ptr && buffer_is_binary(file2.ptr, file2.size))) {
 342                 *binary = 1;
 343                 if (file1.size)
 344                         free(file1.ptr);
 345                 if (file2.size)
 346                         free(file2.ptr);
 347                 return 0;
 348         }
 349
 350         memset(&diff_params, 0, sizeof(diff_params));
 351         memset(&emit_params, 0, sizeof(emit_params));
 352         memset(&emit_cb, 0, sizeof(emit_cb));
 353         diff_params.flags = XDF_NEED_MINIMAL;
 354         if (ignorews)
 355                 diff_params.flags |= XDF_IGNORE_WHITESPACE;
 356         emit_params.ctxlen = context > 0 ? context : 3;
 357         emit_params.flags = XDL_EMIT_FUNCNAMES;
 358         emit_cb.outf = filediff_cb;
 359         emit_cb.priv = fn;
 360         xdl_diff(&file1, &file2, &diff_params, &emit_params, &emit_cb);
 361         if (file1.size)
 362                 free(file1.ptr);
 363         if (file2.size)
 364                 free(file2.ptr);
 365         return 0;
 366 }
 367
 368 void cgit_diff_tree(const unsigned char *old_sha1,
 369                     const unsigned char *new_sha1,
 370                     filepair_fn fn, const char *prefix, int ignorews)
 371 {
 372         struct diff_options opt;
 373         struct pathspec_item item;
 374
 375         memset(&item, 0, sizeof(item));
 376         diff_setup(&opt);
 377         opt.output_format = DIFF_FORMAT_CALLBACK;
 378         opt.detect_rename = 1;
 379         opt.rename_limit = ctx.cfg.renamelimit;
 380         DIFF_OPT_SET(&opt, RECURSIVE);
 381         if (ignorews)
 382                 DIFF_XDL_SET(&opt, IGNORE_WHITESPACE);
 383         opt.format_callback = cgit_diff_tree_cb;
 384         opt.format_callback_data = fn;
 385         if (prefix) {
 386                 item.match = prefix;
 387                 item.len = strlen(prefix);
 388                 opt.pathspec.nr = 1;
 389                 opt.pathspec.items = &item;
 390         }
 391         diff_setup_done(&opt);
 392
 393         if (old_sha1 && !is_null_sha1(old_sha1))
 394                 diff_tree_sha1(old_sha1, new_sha1, "", &opt);
 395         else
 396                 diff_root_tree_sha1(new_sha1, "", &opt);
 397         diffcore_std(&opt);
 398         diff_flush(&opt);
 399 }
 400
 401 void cgit_diff_commit(struct commit *commit, filepair_fn fn, const char *prefix)
 402 {
 403         unsigned char *old_sha1 = NULL;
 404
 405         if (commit->parents)
 406                 old_sha1 = commit->parents->item->object.sha1;
 407         cgit_diff_tree(old_sha1, commit->object.sha1, fn, prefix,
 408                        ctx.qry.ignorews);
 409 }
 410
 411 int cgit_parse_snapshots_mask(const char *str)
 412 {
 413         struct string_list tokens = STRING_LIST_INIT_DUP;
 414         struct string_list_item *item;
 415         const struct cgit_snapshot_format *f;
 416         int rv = 0;
 417
 418         /* favor legacy setting */
 419         if (atoi(str))
 420                 return 1;
 421
 422         string_list_split(&tokens, str, ' ', -1);
 423         string_list_remove_empty_items(&tokens, 0);
 424
 425         for_each_string_list_item(item, &tokens) {
 426                 for (f = cgit_snapshot_formats; f->suffix; f++) {
 427                         if (!strcmp(item->string, f->suffix) ||
 428                             !strcmp(item->string, f->suffix + 1)) {
 429                                 rv |= f->bit;
 430                                 break;
 431                         }
 432                 }
 433         }
 434
 435         string_list_clear(&tokens, 0);
 436         return rv;
 437 }
 438
 439 typedef struct {
 440         char * name;
 441         char * value;
 442 } cgit_env_var;
 443
 444 void cgit_prepare_repo_env(struct cgit_repo * repo)
 445 {
 446         cgit_env_var env_vars[] = {
 447                 { .name = "CGIT_REPO_URL", .value = repo->url },
 448                 { .name = "CGIT_REPO_NAME", .value = repo->name },
 449                 { .name = "CGIT_REPO_PATH", .value = repo->path },
 450                 { .name = "CGIT_REPO_OWNER", .value = repo->owner },
 451                 { .name = "CGIT_REPO_DEFBRANCH", .value = repo->defbranch },
 452                 { .name = "CGIT_REPO_SECTION", .value = repo->section },
 453                 { .name = "CGIT_REPO_CLONE_URL", .value = repo->clone_url }
 454         };
 455         int env_var_count = ARRAY_SIZE(env_vars);
 456         cgit_env_var *p, *q;
 457         static char *warn = "cgit warning: failed to set env: %s=%s\n";
 458
 459         p = env_vars;
 460         q = p + env_var_count;
 461         for (; p < q; p++)
 462                 if (p->value && setenv(p->name, p->value, 1))
 463                         fprintf(stderr, warn, p->name, p->value);
 464 }
 465
 466 /* Read the content of the specified file into a newly allocated buffer,
 467  * zeroterminate the buffer and return 0 on success, errno otherwise.
 468  */
 469 int readfile(const char *path, char **buf, size_t *size)
 470 {
 471         int fd, e;
 472         struct stat st;
 473
 474         fd = open(path, O_RDONLY);
 475         if (fd == -1)
 476                 return errno;
 477         if (fstat(fd, &st)) {
 478                 e = errno;
 479                 close(fd);
 480                 return e;
 481         }
 482         if (!S_ISREG(st.st_mode)) {
 483                 close(fd);
 484                 return EISDIR;
 485         }
 486         *buf = xmalloc(st.st_size + 1);
 487         *size = read_in_full(fd, *buf, st.st_size);
 488         e = errno;
 489         (*buf)[*size] = '\0';
 490         close(fd);
 491         return (*size == st.st_size ? 0 : e);
 492 }
 493
 494 static int is_token_char(char c)
 495 {
 496         return isalnum(c) || c == '_';
 497 }
 498
 499 /* Replace name with getenv(name), return pointer to zero-terminating char
 500  */
 501 static char *expand_macro(char *name, int maxlength)
 502 {
 503         char *value;
 504         int len;
 505
 506         len = 0;
 507         value = getenv(name);
 508         if (value) {
 509                 len = strlen(value);
 510                 if (len > maxlength)
 511                         len = maxlength;
 512                 strncpy(name, value, len);
 513         }
 514         return name + len;
 515 }
 516
 517 #define EXPBUFSIZE (1024 * 8)
 518
 519 /* Replace all tokens prefixed by '$' in the specified text with the
 520  * value of the named environment variable.
 521  * NB: the return value is a static buffer, i.e. it must be strdup'd
 522  * by the caller.
 523  */
 524 char *expand_macros(const char *txt)
 525 {
 526         static char result[EXPBUFSIZE];
 527         char *p, *start;
 528         int len;
 529
 530         p = result;
 531         start = NULL;
 532         while (p < result + EXPBUFSIZE - 1 && txt && *txt) {
 533                 *p = *txt;
 534                 if (start) {
 535                         if (!is_token_char(*txt)) {
 536                                 if (p - start > 0) {
 537                                         *p = '\0';
 538                                         len = result + EXPBUFSIZE - start - 1;
 539                                         p = expand_macro(start, len) - 1;
 540                                 }
 541                                 start = NULL;
 542                                 txt--;
 543                         }
 544                         p++;
 545                         txt++;
 546                         continue;
 547                 }
 548                 if (*txt == '$') {
 549                         start = p;
 550                         txt++;
 551                         continue;
 552                 }
 553                 p++;
 554                 txt++;
 555         }
 556         *p = '\0';
 557         if (start && p - start > 0) {
 558                 len = result + EXPBUFSIZE - start - 1;
 559                 p = expand_macro(start, len);
 560                 *p = '\0';
 561         }
 562         return result;
 563 }