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