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
  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("%s: %s", msg, strerror(errno));
  18         return result;
  19 }
  20
  21 int chk_positive(int result, char *msg)
  22 {
  23         if (result <= 0)
  24                 die("%s: %s", msg, strerror(errno));
  25         return result;
  26 }
  27
  28 int chk_non_negative(int result, char *msg)
  29 {
  30         if (result < 0)
  31                 die("%s: %s",msg, strerror(errno));
  32         return result;
  33 }
  34
  35 struct cgit_repo *cgit_add_repo(const char *url)
  36 {
  37         struct cgit_repo *ret;
  38
  39         if (++cgit_repolist.count > cgit_repolist.length) {
  40                 if (cgit_repolist.length == 0)
  41                         cgit_repolist.length = 8;
  42                 else
  43                         cgit_repolist.length *= 2;
  44                 cgit_repolist.repos = xrealloc(cgit_repolist.repos,
  45                                                cgit_repolist.length *
  46                                                sizeof(struct cgit_repo));
  47         }
  48
  49         ret = &cgit_repolist.repos[cgit_repolist.count-1];
  50         memset(ret, 0, sizeof(struct cgit_repo));
  51         ret->url = trim_end(url, '/');
  52         ret->name = ret->url;
  53         ret->path = NULL;
  54         ret->desc = "[no description]";
  55         ret->owner = NULL;
  56         ret->section = ctx.cfg.section;
  57         ret->defbranch = "master";
  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->module_link = ctx.cfg.module_link;
  66         ret->readme = ctx.cfg.readme;
  67         ret->mtime = -1;
  68         ret->about_filter = ctx.cfg.about_filter;
  69         ret->commit_filter = ctx.cfg.commit_filter;
  70         ret->source_filter = ctx.cfg.source_filter;
  71         return ret;
  72 }
  73
  74 struct cgit_repo *cgit_get_repoinfo(const char *url)
  75 {
  76         int i;
  77         struct cgit_repo *repo;
  78
  79         for (i=0; i<cgit_repolist.count; i++) {
  80                 repo = &cgit_repolist.repos[i];
  81                 if (!strcmp(repo->url, url))
  82                         return repo;
  83         }
  84         return NULL;
  85 }
  86
  87 void *cgit_free_commitinfo(struct commitinfo *info)
  88 {
  89         free(info->author);
  90         free(info->author_email);
  91         free(info->committer);
  92         free(info->committer_email);
  93         free(info->subject);
  94         free(info->msg);
  95         free(info->msg_encoding);
  96         free(info);
  97         return NULL;
  98 }
  99
 100 char *trim_end(const char *str, char c)
 101 {
 102         int len;
 103
 104         if (str == NULL)
 105                 return NULL;
 106         len = strlen(str);
 107         while(len > 0 && str[len - 1] == c)
 108                 len--;
 109         if (len == 0)
 110                 return NULL;
 111         return xstrndup(str, len);
 112 }
 113
 114 char *strlpart(char *txt, int maxlen)
 115 {
 116         char *result;
 117
 118         if (!txt)
 119                 return txt;
 120
 121         if (strlen(txt) <= maxlen)
 122                 return txt;
 123         result = xmalloc(maxlen + 1);
 124         memcpy(result, txt, maxlen - 3);
 125         result[maxlen-1] = result[maxlen-2] = result[maxlen-3] = '.';
 126         result[maxlen] = '\0';
 127         return result;
 128 }
 129
 130 char *strrpart(char *txt, int maxlen)
 131 {
 132         char *result;
 133
 134         if (!txt)
 135                 return txt;
 136
 137         if (strlen(txt) <= maxlen)
 138                 return txt;
 139         result = xmalloc(maxlen + 1);
 140         memcpy(result + 3, txt + strlen(txt) - maxlen + 4, maxlen - 3);
 141         result[0] = result[1] = result[2] = '.';
 142         return result;
 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 struct refinfo *cgit_mk_refinfo(const char *refname, const unsigned char *sha1)
 158 {
 159         struct refinfo *ref;
 160
 161         ref = xmalloc(sizeof (struct refinfo));
 162         ref->refname = xstrdup(refname);
 163         ref->object = parse_object(sha1);
 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 int cgit_refs_cb(const char *refname, const unsigned char *sha1, int flags,
 176                   void *cb_data)
 177 {
 178         struct reflist *list = (struct reflist *)cb_data;
 179         struct refinfo *info = cgit_mk_refinfo(refname, sha1);
 180
 181         if (info)
 182                 cgit_add_ref(list, info);
 183         return 0;
 184 }
 185
 186 void cgit_diff_tree_cb(struct diff_queue_struct *q,
 187                        struct diff_options *options, void *data)
 188 {
 189         int i;
 190
 191         for (i = 0; i < q->nr; i++) {
 192                 if (q->queue[i]->status == 'U')
 193                         continue;
 194                 ((filepair_fn)data)(q->queue[i]);
 195         }
 196 }
 197
 198 static int load_mmfile(mmfile_t *file, const unsigned char *sha1)
 199 {
 200         enum object_type type;
 201
 202         if (is_null_sha1(sha1)) {
 203                 file->ptr = (char *)"";
 204                 file->size = 0;
 205         } else {
 206                 file->ptr = read_sha1_file(sha1, &type,
 207                                            (unsigned long *)&file->size);
 208         }
 209         return 1;
 210 }
 211
 212 /*
 213  * Receive diff-buffers from xdiff and concatenate them as
 214  * needed across multiple callbacks.
 215  *
 216  * This is basically a copy of xdiff-interface.c/xdiff_outf(),
 217  * ripped from git and modified to use globals instead of
 218  * a special callback-struct.
 219  */
 220 char *diffbuf = NULL;
 221 int buflen = 0;
 222
 223 int filediff_cb(void *priv, mmbuffer_t *mb, int nbuf)
 224 {
 225         int i;
 226
 227         for (i = 0; i < nbuf; i++) {
 228                 if (mb[i].ptr[mb[i].size-1] != '\n') {
 229                         /* Incomplete line */
 230                         diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
 231                         memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
 232                         buflen += mb[i].size;
 233                         continue;
 234                 }
 235
 236                 /* we have a complete line */
 237                 if (!diffbuf) {
 238                         ((linediff_fn)priv)(mb[i].ptr, mb[i].size);
 239                         continue;
 240                 }
 241                 diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
 242                 memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
 243                 ((linediff_fn)priv)(diffbuf, buflen + mb[i].size);
 244                 free(diffbuf);
 245                 diffbuf = NULL;
 246                 buflen = 0;
 247         }
 248         if (diffbuf) {
 249                 ((linediff_fn)priv)(diffbuf, buflen);
 250                 free(diffbuf);
 251                 diffbuf = NULL;
 252                 buflen = 0;
 253         }
 254         return 0;
 255 }
 256
 257 int cgit_diff_files(const unsigned char *old_sha1,
 258                     const unsigned char *new_sha1, unsigned long *old_size,
 259                     unsigned long *new_size, int *binary, int context,
 260                     int ignorews, linediff_fn fn)
 261 {
 262         mmfile_t file1, file2;
 263         xpparam_t diff_params;
 264         xdemitconf_t emit_params;
 265         xdemitcb_t emit_cb;
 266
 267         if (!load_mmfile(&file1, old_sha1) || !load_mmfile(&file2, new_sha1))
 268                 return 1;
 269
 270         *old_size = file1.size;
 271         *new_size = file2.size;
 272
 273         if ((file1.ptr && buffer_is_binary(file1.ptr, file1.size)) ||
 274             (file2.ptr && buffer_is_binary(file2.ptr, file2.size))) {
 275                 *binary = 1;
 276                 if (file1.size)
 277                         free(file1.ptr);
 278                 if (file2.size)
 279                         free(file2.ptr);
 280                 return 0;
 281         }
 282
 283         memset(&diff_params, 0, sizeof(diff_params));
 284         memset(&emit_params, 0, sizeof(emit_params));
 285         memset(&emit_cb, 0, sizeof(emit_cb));
 286         diff_params.flags = XDF_NEED_MINIMAL;
 287         if (ignorews)
 288                 diff_params.flags |= XDF_IGNORE_WHITESPACE;
 289         emit_params.ctxlen = context > 0 ? context : 3;
 290         emit_params.flags = XDL_EMIT_FUNCNAMES;
 291         emit_cb.outf = filediff_cb;
 292         emit_cb.priv = fn;
 293         xdl_diff(&file1, &file2, &diff_params, &emit_params, &emit_cb);
 294         if (file1.size)
 295                 free(file1.ptr);
 296         if (file2.size)
 297                 free(file2.ptr);
 298         return 0;
 299 }
 300
 301 void cgit_diff_tree(const unsigned char *old_sha1,
 302                     const unsigned char *new_sha1,
 303                     filepair_fn fn, const char *prefix, int ignorews)
 304 {
 305         struct diff_options opt;
 306         int prefixlen;
 307
 308         diff_setup(&opt);
 309         opt.output_format = DIFF_FORMAT_CALLBACK;
 310         opt.detect_rename = 1;
 311         opt.rename_limit = ctx.cfg.renamelimit;
 312         DIFF_OPT_SET(&opt, RECURSIVE);
 313         if (ignorews)
 314                 DIFF_XDL_SET(&opt, IGNORE_WHITESPACE);
 315         opt.format_callback = cgit_diff_tree_cb;
 316         opt.format_callback_data = fn;
 317         if (prefix) {
 318                 opt.nr_paths = 1;
 319                 opt.paths = &prefix;
 320                 prefixlen = strlen(prefix);
 321                 opt.pathlens = &prefixlen;
 322         }
 323         diff_setup_done(&opt);
 324
 325         if (old_sha1 && !is_null_sha1(old_sha1))
 326                 diff_tree_sha1(old_sha1, new_sha1, "", &opt);
 327         else
 328                 diff_root_tree_sha1(new_sha1, "", &opt);
 329         diffcore_std(&opt);
 330         diff_flush(&opt);
 331 }
 332
 333 void cgit_diff_commit(struct commit *commit, filepair_fn fn, const char *prefix)
 334 {
 335         unsigned char *old_sha1 = NULL;
 336
 337         if (commit->parents)
 338                 old_sha1 = commit->parents->item->object.sha1;
 339         cgit_diff_tree(old_sha1, commit->object.sha1, fn, prefix,
 340                        ctx.qry.ignorews);
 341 }
 342
 343 int cgit_parse_snapshots_mask(const char *str)
 344 {
 345         const struct cgit_snapshot_format *f;
 346         static const char *delim = " \t,:/|;";
 347         int tl, sl, rv = 0;
 348
 349         /* favor legacy setting */
 350         if(atoi(str))
 351                 return 1;
 352         for(;;) {
 353                 str += strspn(str,delim);
 354                 tl = strcspn(str,delim);
 355                 if (!tl)
 356                         break;
 357                 for (f = cgit_snapshot_formats; f->suffix; f++) {
 358                         sl = strlen(f->suffix);
 359                         if((tl == sl && !strncmp(f->suffix, str, tl)) ||
 360                            (tl == sl-1 && !strncmp(f->suffix+1, str, tl-1))) {
 361                                 rv |= f->bit;
 362                                 break;
 363                         }
 364                 }
 365                 str += tl;
 366         }
 367         return rv;
 368 }
 369
 370 int cgit_open_filter(struct cgit_filter *filter)
 371 {
 372
 373         filter->old_stdout = chk_positive(dup(STDOUT_FILENO),
 374                 "Unable to duplicate STDOUT");
 375         chk_zero(pipe(filter->pipe_fh), "Unable to create pipe to subprocess");
 376         filter->pid = chk_non_negative(fork(), "Unable to create subprocess");
 377         if (filter->pid == 0) {
 378                 close(filter->pipe_fh[1]);
 379                 chk_non_negative(dup2(filter->pipe_fh[0], STDIN_FILENO),
 380                         "Unable to use pipe as STDIN");
 381                 execvp(filter->cmd, filter->argv);
 382                 die("Unable to exec subprocess %s: %s (%d)", filter->cmd,
 383                         strerror(errno), errno);
 384         }
 385         close(filter->pipe_fh[0]);
 386         chk_non_negative(dup2(filter->pipe_fh[1], STDOUT_FILENO),
 387                 "Unable to use pipe as STDOUT");
 388         close(filter->pipe_fh[1]);
 389         return 0;
 390 }
 391
 392 int cgit_close_filter(struct cgit_filter *filter)
 393 {
 394         chk_non_negative(dup2(filter->old_stdout, STDOUT_FILENO),
 395                 "Unable to restore STDOUT");
 396         close(filter->old_stdout);
 397         if (filter->pid < 0)
 398                 return 0;
 399         waitpid(filter->pid, &filter->exitstatus, 0);
 400         if (WIFEXITED(filter->exitstatus) && !WEXITSTATUS(filter->exitstatus))
 401                 return 0;
 402         die("Subprocess %s exited abnormally", filter->cmd);
 403 }
 404
 405 /* Read the content of the specified file into a newly allocated buffer,
 406  * zeroterminate the buffer and return 0 on success, errno otherwise.
 407  */
 408 int readfile(const char *path, char **buf, size_t *size)
 409 {
 410         int fd, e;
 411         struct stat st;
 412
 413         fd = open(path, O_RDONLY);
 414         if (fd == -1)
 415                 return errno;
 416         if (fstat(fd, &st)) {
 417                 e = errno;
 418                 close(fd);
 419                 return e;
 420         }
 421         if (!S_ISREG(st.st_mode)) {
 422                 close(fd);
 423                 return EISDIR;
 424         }
 425         *buf = xmalloc(st.st_size + 1);
 426         *size = read_in_full(fd, *buf, st.st_size);
 427         e = errno;
 428         (*buf)[*size] = '\0';
 429         close(fd);
 430         return (*size == st.st_size ? 0 : e);
 431 }
 432
 433 int is_token_char(char c)
 434 {
 435         return isalnum(c) || c == '_';
 436 }
 437
 438 /* Replace name with getenv(name), return pointer to zero-terminating char
 439  */
 440 char *expand_macro(char *name, int maxlength)
 441 {
 442         char *value;
 443         int len;
 444
 445         len = 0;
 446         value = getenv(name);
 447         if (value) {
 448                 len = strlen(value);
 449                 if (len > maxlength)
 450                         len = maxlength;
 451                 strncpy(name, value, len);
 452         }
 453         return name + len;
 454 }
 455
 456 #define EXPBUFSIZE (1024 * 8)
 457
 458 /* Replace all tokens prefixed by '$' in the specified text with the
 459  * value of the named environment variable.
 460  * NB: the return value is a static buffer, i.e. it must be strdup'd
 461  * by the caller.
 462  */
 463 char *expand_macros(const char *txt)
 464 {
 465         static char result[EXPBUFSIZE];
 466         char *p, *start;
 467         int len;
 468
 469         p = result;
 470         start = NULL;
 471         while (p < result + EXPBUFSIZE - 1 && txt && *txt) {
 472                 *p = *txt;
 473                 if (start) {
 474                         if (!is_token_char(*txt)) {
 475                                 if (p - start > 0) {
 476                                         *p = '\0';
 477                                         len = result + EXPBUFSIZE - start - 1;
 478                                         p = expand_macro(start, len) - 1;
 479                                 }
 480                                 start = NULL;
 481                                 txt--;
 482                         }
 483                         p++;
 484                         txt++;
 485                         continue;
 486                 }
 487                 if (*txt == '$') {
 488                         start = p;
 489                         txt++;
 490                         continue;
 491                 }
 492                 p++;
 493                 txt++;
 494         }
 495         *p = '\0';
 496         if (start && p - start > 0) {
 497                 len = result + EXPBUFSIZE - start - 1;
 498                 p = expand_macro(start, len);
 499                 *p = '\0';
 500         }
 501         return result;
 502 }