shared.c

   1 /* shared.c: global vars + some callback functions
   2  *
   3  * Copyright (C) 2006 Lars Hjemli
   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("%s: %s", msg, strerror(errno));
  19         return result;
  20 }
  21
  22 int chk_positive(int result, char *msg)
  23 {
  24         if (result <= 0)
  25                 die("%s: %s", msg, strerror(errno));
  26         return result;
  27 }
  28
  29 int chk_non_negative(int result, char *msg)
  30 {
  31         if (result < 0)
  32                 die("%s: %s", msg, strerror(errno));
  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->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->clone_url = ctx.cfg.clone_url;
  74         ret->submodules.strdup_strings = 1;
  75         return ret;
  76 }
  77
  78 struct cgit_repo *cgit_get_repoinfo(const char *url)
  79 {
  80         int i;
  81         struct cgit_repo *repo;
  82
  83         for (i = 0; i < cgit_repolist.count; i++) {
  84                 repo = &cgit_repolist.repos[i];
  85                 if (!strcmp(repo->url, url))
  86                         return repo;
  87         }
  88         return NULL;
  89 }
  90
  91 void *cgit_free_commitinfo(struct commitinfo *info)
  92 {
  93         free(info->author);
  94         free(info->author_email);
  95         free(info->committer);
  96         free(info->committer_email);
  97         free(info->subject);
  98         free(info->msg);
  99         free(info->msg_encoding);
 100         free(info);
 101         return NULL;
 102 }
 103
 104 char *trim_end(const char *str, char c)
 105 {
 106         int len;
 107
 108         if (str == NULL)
 109                 return NULL;
 110         len = strlen(str);
 111         while (len > 0 && str[len - 1] == c)
 112                 len--;
 113         if (len == 0)
 114                 return NULL;
 115         return xstrndup(str, len);
 116 }
 117
 118 char *strlpart(char *txt, int maxlen)
 119 {
 120         char *result;
 121
 122         if (!txt)
 123                 return txt;
 124
 125         if (strlen(txt) <= maxlen)
 126                 return txt;
 127         result = xmalloc(maxlen + 1);
 128         memcpy(result, txt, maxlen - 3);
 129         result[maxlen-1] = result[maxlen-2] = result[maxlen-3] = '.';
 130         result[maxlen] = '\0';
 131         return result;
 132 }
 133
 134 char *strrpart(char *txt, int maxlen)
 135 {
 136         char *result;
 137
 138         if (!txt)
 139                 return txt;
 140
 141         if (strlen(txt) <= maxlen)
 142                 return txt;
 143         result = xmalloc(maxlen + 1);
 144         memcpy(result + 3, txt + strlen(txt) - maxlen + 4, maxlen - 3);
 145         result[0] = result[1] = result[2] = '.';
 146         return result;
 147 }
 148
 149 void cgit_add_ref(struct reflist *list, struct refinfo *ref)
 150 {
 151         size_t size;
 152
 153         if (list->count >= list->alloc) {
 154                 list->alloc += (list->alloc ? list->alloc : 4);
 155                 size = list->alloc * sizeof(struct refinfo *);
 156                 list->refs = xrealloc(list->refs, size);
 157         }
 158         list->refs[list->count++] = ref;
 159 }
 160
 161 static struct refinfo *cgit_mk_refinfo(const char *refname, const unsigned char *sha1)
 162 {
 163         struct refinfo *ref;
 164
 165         ref = xmalloc(sizeof (struct refinfo));
 166         ref->refname = xstrdup(refname);
 167         ref->object = parse_object(sha1);
 168         switch (ref->object->type) {
 169         case OBJ_TAG:
 170                 ref->tag = cgit_parse_tag((struct tag *)ref->object);
 171                 break;
 172         case OBJ_COMMIT:
 173                 ref->commit = cgit_parse_commit((struct commit *)ref->object);
 174                 break;
 175         }
 176         return ref;
 177 }
 178
 179 static void cgit_free_taginfo(struct taginfo *tag)
 180 {
 181         if (tag->tagger)
 182                 free(tag->tagger);
 183         if (tag->tagger_email)
 184                 free(tag->tagger_email);
 185         if (tag->msg)
 186                 free(tag->msg);
 187         free(tag);
 188 }
 189
 190 static void cgit_free_refinfo(struct refinfo *ref)
 191 {
 192         if (ref->refname)
 193                 free((char *)ref->refname);
 194         switch (ref->object->type) {
 195         case OBJ_TAG:
 196                 cgit_free_taginfo(ref->tag);
 197                 break;
 198         case OBJ_COMMIT:
 199                 cgit_free_commitinfo(ref->commit);
 200                 break;
 201         }
 202         free(ref);
 203 }
 204
 205 void cgit_free_reflist_inner(struct reflist *list)
 206 {
 207         int i;
 208
 209         for (i = 0; i < list->count; i++) {
 210                 cgit_free_refinfo(list->refs[i]);
 211         }
 212         free(list->refs);
 213 }
 214
 215 int cgit_refs_cb(const char *refname, const unsigned char *sha1, int flags,
 216                   void *cb_data)
 217 {
 218         struct reflist *list = (struct reflist *)cb_data;
 219         struct refinfo *info = cgit_mk_refinfo(refname, sha1);
 220
 221         if (info)
 222                 cgit_add_ref(list, info);
 223         return 0;
 224 }
 225
 226 static void cgit_diff_tree_cb(struct diff_queue_struct *q,
 227                               struct diff_options *options, void *data)
 228 {
 229         int i;
 230
 231         for (i = 0; i < q->nr; i++) {
 232                 if (q->queue[i]->status == 'U')
 233                         continue;
 234                 ((filepair_fn)data)(q->queue[i]);
 235         }
 236 }
 237
 238 static int load_mmfile(mmfile_t *file, const unsigned char *sha1)
 239 {
 240         enum object_type type;
 241
 242         if (is_null_sha1(sha1)) {
 243                 file->ptr = (char *)"";
 244                 file->size = 0;
 245         } else {
 246                 file->ptr = read_sha1_file(sha1, &type,
 247                                            (unsigned long *)&file->size);
 248         }
 249         return 1;
 250 }
 251
 252 /*
 253  * Receive diff-buffers from xdiff and concatenate them as
 254  * needed across multiple callbacks.
 255  *
 256  * This is basically a copy of xdiff-interface.c/xdiff_outf(),
 257  * ripped from git and modified to use globals instead of
 258  * a special callback-struct.
 259  */
 260 char *diffbuf = NULL;
 261 int buflen = 0;
 262
 263 static int filediff_cb(void *priv, mmbuffer_t *mb, int nbuf)
 264 {
 265         int i;
 266
 267         for (i = 0; i < nbuf; i++) {
 268                 if (mb[i].ptr[mb[i].size-1] != '\n') {
 269                         /* Incomplete line */
 270                         diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
 271                         memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
 272                         buflen += mb[i].size;
 273                         continue;
 274                 }
 275
 276                 /* we have a complete line */
 277                 if (!diffbuf) {
 278                         ((linediff_fn)priv)(mb[i].ptr, mb[i].size);
 279                         continue;
 280                 }
 281                 diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
 282                 memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
 283                 ((linediff_fn)priv)(diffbuf, buflen + mb[i].size);
 284                 free(diffbuf);
 285                 diffbuf = NULL;
 286                 buflen = 0;
 287         }
 288         if (diffbuf) {
 289                 ((linediff_fn)priv)(diffbuf, buflen);
 290                 free(diffbuf);
 291                 diffbuf = NULL;
 292                 buflen = 0;
 293         }
 294         return 0;
 295 }
 296
 297 int cgit_diff_files(const unsigned char *old_sha1,
 298                     const unsigned char *new_sha1, unsigned long *old_size,
 299                     unsigned long *new_size, int *binary, int context,
 300                     int ignorews, linediff_fn fn)
 301 {
 302         mmfile_t file1, file2;
 303         xpparam_t diff_params;
 304         xdemitconf_t emit_params;
 305         xdemitcb_t emit_cb;
 306
 307         if (!load_mmfile(&file1, old_sha1) || !load_mmfile(&file2, new_sha1))
 308                 return 1;
 309
 310         *old_size = file1.size;
 311         *new_size = file2.size;
 312
 313         if ((file1.ptr && buffer_is_binary(file1.ptr, file1.size)) ||
 314             (file2.ptr && buffer_is_binary(file2.ptr, file2.size))) {
 315                 *binary = 1;
 316                 if (file1.size)
 317                         free(file1.ptr);
 318                 if (file2.size)
 319                         free(file2.ptr);
 320                 return 0;
 321         }
 322
 323         memset(&diff_params, 0, sizeof(diff_params));
 324         memset(&emit_params, 0, sizeof(emit_params));
 325         memset(&emit_cb, 0, sizeof(emit_cb));
 326         diff_params.flags = XDF_NEED_MINIMAL;
 327         if (ignorews)
 328                 diff_params.flags |= XDF_IGNORE_WHITESPACE;
 329         emit_params.ctxlen = context > 0 ? context : 3;
 330         emit_params.flags = XDL_EMIT_FUNCNAMES;
 331         emit_cb.outf = filediff_cb;
 332         emit_cb.priv = fn;
 333         xdl_diff(&file1, &file2, &diff_params, &emit_params, &emit_cb);
 334         if (file1.size)
 335                 free(file1.ptr);
 336         if (file2.size)
 337                 free(file2.ptr);
 338         return 0;
 339 }
 340
 341 void cgit_diff_tree(const unsigned char *old_sha1,
 342                     const unsigned char *new_sha1,
 343                     filepair_fn fn, const char *prefix, int ignorews)
 344 {
 345         struct diff_options opt;
 346         struct pathspec_item item;
 347
 348         diff_setup(&opt);
 349         opt.output_format = DIFF_FORMAT_CALLBACK;
 350         opt.detect_rename = 1;
 351         opt.rename_limit = ctx.cfg.renamelimit;
 352         DIFF_OPT_SET(&opt, RECURSIVE);
 353         if (ignorews)
 354                 DIFF_XDL_SET(&opt, IGNORE_WHITESPACE);
 355         opt.format_callback = cgit_diff_tree_cb;
 356         opt.format_callback_data = fn;
 357         if (prefix) {
 358                 item.match = prefix;
 359                 item.len = strlen(prefix);
 360                 opt.pathspec.nr = 1;
 361                 opt.pathspec.items = &item;
 362         }
 363         diff_setup_done(&opt);
 364
 365         if (old_sha1 && !is_null_sha1(old_sha1))
 366                 diff_tree_sha1(old_sha1, new_sha1, "", &opt);
 367         else
 368                 diff_root_tree_sha1(new_sha1, "", &opt);
 369         diffcore_std(&opt);
 370         diff_flush(&opt);
 371 }
 372
 373 void cgit_diff_commit(struct commit *commit, filepair_fn fn, const char *prefix)
 374 {
 375         unsigned char *old_sha1 = NULL;
 376
 377         if (commit->parents)
 378                 old_sha1 = commit->parents->item->object.sha1;
 379         cgit_diff_tree(old_sha1, commit->object.sha1, fn, prefix,
 380                        ctx.qry.ignorews);
 381 }
 382
 383 int cgit_parse_snapshots_mask(const char *str)
 384 {
 385         const struct cgit_snapshot_format *f;
 386         static const char *delim = " \t,:/|;";
 387         int tl, sl, rv = 0;
 388
 389         /* favor legacy setting */
 390         if (atoi(str))
 391                 return 1;
 392         for (;;) {
 393                 str += strspn(str, delim);
 394                 tl = strcspn(str, delim);
 395                 if (!tl)
 396                         break;
 397                 for (f = cgit_snapshot_formats; f->suffix; f++) {
 398                         sl = strlen(f->suffix);
 399                         if ((tl == sl && !strncmp(f->suffix, str, tl)) ||
 400                            (tl == sl - 1 && !strncmp(f->suffix + 1, str, tl - 1))) {
 401                                 rv |= f->bit;
 402                                 break;
 403                         }
 404                 }
 405                 str += tl;
 406         }
 407         return rv;
 408 }
 409
 410 typedef struct {
 411         char * name;
 412         char * value;
 413 } cgit_env_var;
 414
 415 void cgit_prepare_repo_env(struct cgit_repo * repo)
 416 {
 417         cgit_env_var env_vars[] = {
 418                 { .name = "CGIT_REPO_URL", .value = repo->url },
 419                 { .name = "CGIT_REPO_NAME", .value = repo->name },
 420                 { .name = "CGIT_REPO_PATH", .value = repo->path },
 421                 { .name = "CGIT_REPO_OWNER", .value = repo->owner },
 422                 { .name = "CGIT_REPO_DEFBRANCH", .value = repo->defbranch },
 423                 { .name = "CGIT_REPO_SECTION", .value = repo->section },
 424                 { .name = "CGIT_REPO_CLONE_URL", .value = repo->clone_url }
 425         };
 426         int env_var_count = ARRAY_SIZE(env_vars);
 427         cgit_env_var *p, *q;
 428         static char *warn = "cgit warning: failed to set env: %s=%s\n";
 429
 430         p = env_vars;
 431         q = p + env_var_count;
 432         for (; p < q; p++)
 433                 if (p->value && setenv(p->name, p->value, 1))
 434                         fprintf(stderr, warn, p->name, p->value);
 435 }
 436
 437 int cgit_open_filter(struct cgit_filter *filter)
 438 {
 439
 440         filter->old_stdout = chk_positive(dup(STDOUT_FILENO),
 441                 "Unable to duplicate STDOUT");
 442         chk_zero(pipe(filter->pipe_fh), "Unable to create pipe to subprocess");
 443         filter->pid = chk_non_negative(fork(), "Unable to create subprocess");
 444         if (filter->pid == 0) {
 445                 close(filter->pipe_fh[1]);
 446                 chk_non_negative(dup2(filter->pipe_fh[0], STDIN_FILENO),
 447                         "Unable to use pipe as STDIN");
 448                 execvp(filter->cmd, filter->argv);
 449                 die("Unable to exec subprocess %s: %s (%d)", filter->cmd,
 450                         strerror(errno), errno);
 451         }
 452         close(filter->pipe_fh[0]);
 453         chk_non_negative(dup2(filter->pipe_fh[1], STDOUT_FILENO),
 454                 "Unable to use pipe as STDOUT");
 455         close(filter->pipe_fh[1]);
 456         return 0;
 457 }
 458
 459 int cgit_close_filter(struct cgit_filter *filter)
 460 {
 461         chk_non_negative(dup2(filter->old_stdout, STDOUT_FILENO),
 462                 "Unable to restore STDOUT");
 463         close(filter->old_stdout);
 464         if (filter->pid < 0)
 465                 return 0;
 466         waitpid(filter->pid, &filter->exitstatus, 0);
 467         if (WIFEXITED(filter->exitstatus) && !WEXITSTATUS(filter->exitstatus))
 468                 return 0;
 469         die("Subprocess %s exited abnormally", filter->cmd);
 470 }
 471
 472 /* Read the content of the specified file into a newly allocated buffer,
 473  * zeroterminate the buffer and return 0 on success, errno otherwise.
 474  */
 475 int readfile(const char *path, char **buf, size_t *size)
 476 {
 477         int fd, e;
 478         struct stat st;
 479
 480         fd = open(path, O_RDONLY);
 481         if (fd == -1)
 482                 return errno;
 483         if (fstat(fd, &st)) {
 484                 e = errno;
 485                 close(fd);
 486                 return e;
 487         }
 488         if (!S_ISREG(st.st_mode)) {
 489                 close(fd);
 490                 return EISDIR;
 491         }
 492         *buf = xmalloc(st.st_size + 1);
 493         *size = read_in_full(fd, *buf, st.st_size);
 494         e = errno;
 495         (*buf)[*size] = '\0';
 496         close(fd);
 497         return (*size == st.st_size ? 0 : e);
 498 }
 499
 500 static int is_token_char(char c)
 501 {
 502         return isalnum(c) || c == '_';
 503 }
 504
 505 /* Replace name with getenv(name), return pointer to zero-terminating char
 506  */
 507 static char *expand_macro(char *name, int maxlength)
 508 {
 509         char *value;
 510         int len;
 511
 512         len = 0;
 513         value = getenv(name);
 514         if (value) {
 515                 len = strlen(value);
 516                 if (len > maxlength)
 517                         len = maxlength;
 518                 strncpy(name, value, len);
 519         }
 520         return name + len;
 521 }
 522
 523 #define EXPBUFSIZE (1024 * 8)
 524
 525 /* Replace all tokens prefixed by '$' in the specified text with the
 526  * value of the named environment variable.
 527  * NB: the return value is a static buffer, i.e. it must be strdup'd
 528  * by the caller.
 529  */
 530 char *expand_macros(const char *txt)
 531 {
 532         static char result[EXPBUFSIZE];
 533         char *p, *start;
 534         int len;
 535
 536         p = result;
 537         start = NULL;
 538         while (p < result + EXPBUFSIZE - 1 && txt && *txt) {
 539                 *p = *txt;
 540                 if (start) {
 541                         if (!is_token_char(*txt)) {
 542                                 if (p - start > 0) {
 543                                         *p = '\0';
 544                                         len = result + EXPBUFSIZE - start - 1;
 545                                         p = expand_macro(start, len) - 1;
 546                                 }
 547                                 start = NULL;
 548                                 txt--;
 549                         }
 550                         p++;
 551                         txt++;
 552                         continue;
 553                 }
 554                 if (*txt == '$') {
 555                         start = p;
 556                         txt++;
 557                         continue;
 558                 }
 559                 p++;
 560                 txt++;
 561         }
 562         *p = '\0';
 563         if (start && p - start > 0) {
 564                 len = result + EXPBUFSIZE - start - 1;
 565                 p = expand_macro(start, len);
 566                 *p = '\0';
 567         }
 568         return result;
 569 }