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 #include <linux/limits.h>
  12
  13 struct cgit_repolist cgit_repolist;
  14 struct cgit_context ctx;
  15
  16 int chk_zero(int result, char *msg)
  17 {
  18         if (result != 0)
  19                 die("%s: %s", msg, strerror(errno));
  20         return result;
  21 }
  22
  23 int chk_positive(int result, char *msg)
  24 {
  25         if (result <= 0)
  26                 die("%s: %s", msg, strerror(errno));
  27         return result;
  28 }
  29
  30 int chk_non_negative(int result, char *msg)
  31 {
  32         if (result < 0)
  33                 die("%s: %s",msg, strerror(errno));
  34         return result;
  35 }
  36
  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 = "[no description]";
  57         ret->owner = NULL;
  58         ret->section = ctx.cfg.section;
  59         ret->defbranch = "master";
  60         ret->snapshots = ctx.cfg.snapshots;
  61         ret->enable_commit_graph = ctx.cfg.enable_commit_graph;
  62         ret->enable_log_filecount = ctx.cfg.enable_log_filecount;
  63         ret->enable_log_linecount = ctx.cfg.enable_log_linecount;
  64         ret->enable_remote_branches = ctx.cfg.enable_remote_branches;
  65         ret->enable_subject_links = ctx.cfg.enable_subject_links;
  66         ret->max_stats = ctx.cfg.max_stats;
  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         return ret;
  75 }
  76
  77 struct cgit_repo *cgit_get_repoinfo(const char *url)
  78 {
  79         int i;
  80         struct cgit_repo *repo;
  81
  82         for (i=0; i<cgit_repolist.count; i++) {
  83                 repo = &cgit_repolist.repos[i];
  84                 if (!strcmp(repo->url, url))
  85                         return repo;
  86         }
  87         return NULL;
  88 }
  89
  90 void *cgit_free_commitinfo(struct commitinfo *info)
  91 {
  92         free(info->author);
  93         free(info->author_email);
  94         free(info->committer);
  95         free(info->committer_email);
  96         free(info->subject);
  97         free(info->msg);
  98         free(info->msg_encoding);
  99         free(info);
 100         return NULL;
 101 }
 102
 103 char *trim_end(const char *str, char c)
 104 {
 105         int len;
 106
 107         if (str == NULL)
 108                 return NULL;
 109         len = strlen(str);
 110         while(len > 0 && str[len - 1] == c)
 111                 len--;
 112         if (len == 0)
 113                 return NULL;
 114         return xstrndup(str, len);
 115 }
 116
 117 char *strlpart(char *txt, int maxlen)
 118 {
 119         char *result;
 120
 121         if (!txt)
 122                 return txt;
 123
 124         if (strlen(txt) <= maxlen)
 125                 return txt;
 126         result = xmalloc(maxlen + 1);
 127         memcpy(result, txt, maxlen - 3);
 128         result[maxlen-1] = result[maxlen-2] = result[maxlen-3] = '.';
 129         result[maxlen] = '\0';
 130         return result;
 131 }
 132
 133 char *strrpart(char *txt, int maxlen)
 134 {
 135         char *result;
 136
 137         if (!txt)
 138                 return txt;
 139
 140         if (strlen(txt) <= maxlen)
 141                 return txt;
 142         result = xmalloc(maxlen + 1);
 143         memcpy(result + 3, txt + strlen(txt) - maxlen + 4, maxlen - 3);
 144         result[0] = result[1] = result[2] = '.';
 145         return result;
 146 }
 147
 148 void cgit_add_ref(struct reflist *list, struct refinfo *ref)
 149 {
 150         size_t size;
 151
 152         if (list->count >= list->alloc) {
 153                 list->alloc += (list->alloc ? list->alloc : 4);
 154                 size = list->alloc * sizeof(struct refinfo *);
 155                 list->refs = xrealloc(list->refs, size);
 156         }
 157         list->refs[list->count++] = ref;
 158 }
 159
 160 struct refinfo *cgit_mk_refinfo(const char *refname, const unsigned char *sha1)
 161 {
 162         struct refinfo *ref;
 163
 164         ref = xmalloc(sizeof (struct refinfo));
 165         ref->refname = xstrdup(refname);
 166         ref->object = parse_object(sha1);
 167         switch (ref->object->type) {
 168         case OBJ_TAG:
 169                 ref->tag = cgit_parse_tag((struct tag *)ref->object);
 170                 break;
 171         case OBJ_COMMIT:
 172                 ref->commit = cgit_parse_commit((struct commit *)ref->object);
 173                 break;
 174         }
 175         return ref;
 176 }
 177
 178 int cgit_refs_cb(const char *refname, const unsigned char *sha1, int flags,
 179                   void *cb_data)
 180 {
 181         struct reflist *list = (struct reflist *)cb_data;
 182         struct refinfo *info = cgit_mk_refinfo(refname, sha1);
 183
 184         if (info)
 185                 cgit_add_ref(list, info);
 186         return 0;
 187 }
 188
 189 void cgit_diff_tree_cb(struct diff_queue_struct *q,
 190                        struct diff_options *options, void *data)
 191 {
 192         int i;
 193
 194         for (i = 0; i < q->nr; i++) {
 195                 if (q->queue[i]->status == 'U')
 196                         continue;
 197                 ((filepair_fn)data)(q->queue[i]);
 198         }
 199 }
 200
 201 static int load_mmfile(mmfile_t *file, const unsigned char *sha1)
 202 {
 203         enum object_type type;
 204
 205         if (is_null_sha1(sha1)) {
 206                 file->ptr = (char *)"";
 207                 file->size = 0;
 208         } else {
 209                 file->ptr = read_sha1_file(sha1, &type,
 210                                            (unsigned long *)&file->size);
 211         }
 212         return 1;
 213 }
 214
 215 /*
 216  * Receive diff-buffers from xdiff and concatenate them as
 217  * needed across multiple callbacks.
 218  *
 219  * This is basically a copy of xdiff-interface.c/xdiff_outf(),
 220  * ripped from git and modified to use globals instead of
 221  * a special callback-struct.
 222  */
 223 char *diffbuf = NULL;
 224 int buflen = 0;
 225
 226 int filediff_cb(void *priv, mmbuffer_t *mb, int nbuf)
 227 {
 228         int i;
 229
 230         for (i = 0; i < nbuf; i++) {
 231                 if (mb[i].ptr[mb[i].size-1] != '\n') {
 232                         /* Incomplete line */
 233                         diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
 234                         memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
 235                         buflen += mb[i].size;
 236                         continue;
 237                 }
 238
 239                 /* we have a complete line */
 240                 if (!diffbuf) {
 241                         ((linediff_fn)priv)(mb[i].ptr, mb[i].size);
 242                         continue;
 243                 }
 244                 diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
 245                 memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
 246                 ((linediff_fn)priv)(diffbuf, buflen + mb[i].size);
 247                 free(diffbuf);
 248                 diffbuf = NULL;
 249                 buflen = 0;
 250         }
 251         if (diffbuf) {
 252                 ((linediff_fn)priv)(diffbuf, buflen);
 253                 free(diffbuf);
 254                 diffbuf = NULL;
 255                 buflen = 0;
 256         }
 257         return 0;
 258 }
 259
 260 int cgit_diff_files(const unsigned char *old_sha1,
 261                     const unsigned char *new_sha1, unsigned long *old_size,
 262                     unsigned long *new_size, int *binary, int context,
 263                     int ignorews, linediff_fn fn)
 264 {
 265         mmfile_t file1, file2;
 266         xpparam_t diff_params;
 267         xdemitconf_t emit_params;
 268         xdemitcb_t emit_cb;
 269
 270         if (!load_mmfile(&file1, old_sha1) || !load_mmfile(&file2, new_sha1))
 271                 return 1;
 272
 273         *old_size = file1.size;
 274         *new_size = file2.size;
 275
 276         if ((file1.ptr && buffer_is_binary(file1.ptr, file1.size)) ||
 277             (file2.ptr && buffer_is_binary(file2.ptr, file2.size))) {
 278                 *binary = 1;
 279                 if (file1.size)
 280                         free(file1.ptr);
 281                 if (file2.size)
 282                         free(file2.ptr);
 283                 return 0;
 284         }
 285
 286         memset(&diff_params, 0, sizeof(diff_params));
 287         memset(&emit_params, 0, sizeof(emit_params));
 288         memset(&emit_cb, 0, sizeof(emit_cb));
 289         diff_params.flags = XDF_NEED_MINIMAL;
 290         if (ignorews)
 291                 diff_params.flags |= XDF_IGNORE_WHITESPACE;
 292         emit_params.ctxlen = context > 0 ? context : 3;
 293         emit_params.flags = XDL_EMIT_FUNCNAMES;
 294         emit_cb.outf = filediff_cb;
 295         emit_cb.priv = fn;
 296         xdl_diff(&file1, &file2, &diff_params, &emit_params, &emit_cb);
 297         if (file1.size)
 298                 free(file1.ptr);
 299         if (file2.size)
 300                 free(file2.ptr);
 301         return 0;
 302 }
 303
 304 void cgit_diff_tree(const unsigned char *old_sha1,
 305                     const unsigned char *new_sha1,
 306                     filepair_fn fn, const char *prefix, int ignorews)
 307 {
 308         struct diff_options opt;
 309         int prefixlen;
 310
 311         diff_setup(&opt);
 312         opt.output_format = DIFF_FORMAT_CALLBACK;
 313         opt.detect_rename = 1;
 314         opt.rename_limit = ctx.cfg.renamelimit;
 315         DIFF_OPT_SET(&opt, RECURSIVE);
 316         if (ignorews)
 317                 DIFF_XDL_SET(&opt, IGNORE_WHITESPACE);
 318         opt.format_callback = cgit_diff_tree_cb;
 319         opt.format_callback_data = fn;
 320         if (prefix) {
 321                 opt.nr_paths = 1;
 322                 opt.paths = &prefix;
 323                 prefixlen = strlen(prefix);
 324                 opt.pathlens = &prefixlen;
 325         }
 326         diff_setup_done(&opt);
 327
 328         if (old_sha1 && !is_null_sha1(old_sha1))
 329                 diff_tree_sha1(old_sha1, new_sha1, "", &opt);
 330         else
 331                 diff_root_tree_sha1(new_sha1, "", &opt);
 332         diffcore_std(&opt);
 333         diff_flush(&opt);
 334 }
 335
 336 void cgit_diff_commit(struct commit *commit, filepair_fn fn, const char *prefix)
 337 {
 338         unsigned char *old_sha1 = NULL;
 339
 340         if (commit->parents)
 341                 old_sha1 = commit->parents->item->object.sha1;
 342         cgit_diff_tree(old_sha1, commit->object.sha1, fn, prefix,
 343                        ctx.qry.ignorews);
 344 }
 345
 346 int cgit_parse_snapshots_mask(const char *str)
 347 {
 348         const struct cgit_snapshot_format *f;
 349         static const char *delim = " \t,:/|;";
 350         int tl, sl, rv = 0;
 351
 352         /* favor legacy setting */
 353         if(atoi(str))
 354                 return 1;
 355         for(;;) {
 356                 str += strspn(str,delim);
 357                 tl = strcspn(str,delim);
 358                 if (!tl)
 359                         break;
 360                 for (f = cgit_snapshot_formats; f->suffix; f++) {
 361                         sl = strlen(f->suffix);
 362                         if((tl == sl && !strncmp(f->suffix, str, tl)) ||
 363                            (tl == sl-1 && !strncmp(f->suffix+1, str, tl-1))) {
 364                                 rv |= f->bit;
 365                                 break;
 366                         }
 367                 }
 368                 str += tl;
 369         }
 370         return rv;
 371 }
 372
 373 typedef struct {
 374         char * name;
 375         char * value;
 376 } cgit_env_var;
 377
 378 void cgit_prepare_repo_env(struct cgit_repo * repo)
 379 {
 380         cgit_env_var env_vars[] = {
 381                 { .name = "CGIT_REPO_URL", .value = repo->url },
 382                 { .name = "CGIT_REPO_NAME", .value = repo->name },
 383                 { .name = "CGIT_REPO_PATH", .value = repo->path },
 384                 { .name = "CGIT_REPO_OWNER", .value = repo->owner },
 385                 { .name = "CGIT_REPO_DEFBRANCH", .value = repo->defbranch },
 386                 { .name = "CGIT_REPO_SECTION", .value = repo->section },
 387                 { .name = "CGIT_REPO_CLONE_URL", .value = repo->clone_url }
 388         };
 389         int env_var_count = ARRAY_SIZE(env_vars);
 390         cgit_env_var *p, *q;
 391         static char *warn = "cgit warning: failed to set env: %s=%s\n";
 392
 393         p = env_vars;
 394         q = p + env_var_count;
 395         for (; p < q; p++)
 396                 if (setenv(p->name, p->value, 1))
 397                         fprintf(stderr, warn, p->name, p->value);
 398 }
 399
 400 int cgit_open_filter(struct cgit_filter *filter)
 401 {
 402
 403         filter->old_stdout = chk_positive(dup(STDOUT_FILENO),
 404                 "Unable to duplicate STDOUT");
 405         chk_zero(pipe(filter->pipe_fh), "Unable to create pipe to subprocess");
 406         filter->pid = chk_non_negative(fork(), "Unable to create subprocess");
 407         if (filter->pid == 0) {
 408                 close(filter->pipe_fh[1]);
 409                 chk_non_negative(dup2(filter->pipe_fh[0], STDIN_FILENO),
 410                         "Unable to use pipe as STDIN");
 411                 execvp(filter->cmd, filter->argv);
 412                 die("Unable to exec subprocess %s: %s (%d)", filter->cmd,
 413                         strerror(errno), errno);
 414         }
 415         close(filter->pipe_fh[0]);
 416         chk_non_negative(dup2(filter->pipe_fh[1], STDOUT_FILENO),
 417                 "Unable to use pipe as STDOUT");
 418         close(filter->pipe_fh[1]);
 419         return 0;
 420 }
 421
 422 int cgit_close_filter(struct cgit_filter *filter)
 423 {
 424         chk_non_negative(dup2(filter->old_stdout, STDOUT_FILENO),
 425                 "Unable to restore STDOUT");
 426         close(filter->old_stdout);
 427         if (filter->pid < 0)
 428                 return 0;
 429         waitpid(filter->pid, &filter->exitstatus, 0);
 430         if (WIFEXITED(filter->exitstatus) && !WEXITSTATUS(filter->exitstatus))
 431                 return 0;
 432         die("Subprocess %s exited abnormally", filter->cmd);
 433 }
 434
 435 /* Read the content of the specified file into a newly allocated buffer,
 436  * zeroterminate the buffer and return 0 on success, errno otherwise.
 437  */
 438 int readfile(const char *path, char **buf, size_t *size)
 439 {
 440         int fd, e;
 441         struct stat st;
 442
 443         fd = open(path, O_RDONLY);
 444         if (fd == -1)
 445                 return errno;
 446         if (fstat(fd, &st)) {
 447                 e = errno;
 448                 close(fd);
 449                 return e;
 450         }
 451         if (!S_ISREG(st.st_mode)) {
 452                 close(fd);
 453                 return EISDIR;
 454         }
 455         *buf = xmalloc(st.st_size + 1);
 456         *size = read_in_full(fd, *buf, st.st_size);
 457         e = errno;
 458         (*buf)[*size] = '\0';
 459         close(fd);
 460         return (*size == st.st_size ? 0 : e);
 461 }
 462
 463 int is_token_char(char c)
 464 {
 465         return isalnum(c) || c == '_';
 466 }
 467
 468 /* Replace name with getenv(name), return pointer to zero-terminating char
 469  */
 470 char *expand_macro(char *name, int maxlength)
 471 {
 472         char *value;
 473         int len;
 474
 475         len = 0;
 476         value = getenv(name);
 477         if (value) {
 478                 len = strlen(value);
 479                 if (len > maxlength)
 480                         len = maxlength;
 481                 strncpy(name, value, len);
 482         }
 483         return name + len;
 484 }
 485
 486 #define EXPBUFSIZE (1024 * 8)
 487
 488 /* Replace all tokens prefixed by '$' in the specified text with the
 489  * value of the named environment variable.
 490  * NB: the return value is a static buffer, i.e. it must be strdup'd
 491  * by the caller.
 492  */
 493 char *expand_macros(const char *txt)
 494 {
 495         static char result[EXPBUFSIZE];
 496         char *p, *start;
 497         int len;
 498
 499         p = result;
 500         start = NULL;
 501         while (p < result + EXPBUFSIZE - 1 && txt && *txt) {
 502                 *p = *txt;
 503                 if (start) {
 504                         if (!is_token_char(*txt)) {
 505                                 if (p - start > 0) {
 506                                         *p = '\0';
 507                                         len = result + EXPBUFSIZE - start - 1;
 508                                         p = expand_macro(start, len) - 1;
 509                                 }
 510                                 start = NULL;
 511                                 txt--;
 512                         }
 513                         p++;
 514                         txt++;
 515                         continue;
 516                 }
 517                 if (*txt == '$') {
 518                         start = p;
 519                         txt++;
 520                         continue;
 521                 }
 522                 p++;
 523                 txt++;
 524         }
 525         *p = '\0';
 526         if (start && p - start > 0) {
 527                 len = result + EXPBUFSIZE - start - 1;
 528                 p = expand_macro(start, len);
 529                 *p = '\0';
 530         }
 531         return result;
 532 }