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         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 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 int cgit_refs_cb(const char *refname, const unsigned char *sha1, int flags,
 180                   void *cb_data)
 181 {
 182         struct reflist *list = (struct reflist *)cb_data;
 183         struct refinfo *info = cgit_mk_refinfo(refname, sha1);
 184
 185         if (info)
 186                 cgit_add_ref(list, info);
 187         return 0;
 188 }
 189
 190 void cgit_diff_tree_cb(struct diff_queue_struct *q,
 191                        struct diff_options *options, void *data)
 192 {
 193         int i;
 194
 195         for (i = 0; i < q->nr; i++) {
 196                 if (q->queue[i]->status == 'U')
 197                         continue;
 198                 ((filepair_fn)data)(q->queue[i]);
 199         }
 200 }
 201
 202 static int load_mmfile(mmfile_t *file, const unsigned char *sha1)
 203 {
 204         enum object_type type;
 205
 206         if (is_null_sha1(sha1)) {
 207                 file->ptr = (char *)"";
 208                 file->size = 0;
 209         } else {
 210                 file->ptr = read_sha1_file(sha1, &type,
 211                                            (unsigned long *)&file->size);
 212         }
 213         return 1;
 214 }
 215
 216 /*
 217  * Receive diff-buffers from xdiff and concatenate them as
 218  * needed across multiple callbacks.
 219  *
 220  * This is basically a copy of xdiff-interface.c/xdiff_outf(),
 221  * ripped from git and modified to use globals instead of
 222  * a special callback-struct.
 223  */
 224 char *diffbuf = NULL;
 225 int buflen = 0;
 226
 227 int filediff_cb(void *priv, mmbuffer_t *mb, int nbuf)
 228 {
 229         int i;
 230
 231         for (i = 0; i < nbuf; i++) {
 232                 if (mb[i].ptr[mb[i].size-1] != '\n') {
 233                         /* Incomplete line */
 234                         diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
 235                         memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
 236                         buflen += mb[i].size;
 237                         continue;
 238                 }
 239
 240                 /* we have a complete line */
 241                 if (!diffbuf) {
 242                         ((linediff_fn)priv)(mb[i].ptr, mb[i].size);
 243                         continue;
 244                 }
 245                 diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
 246                 memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
 247                 ((linediff_fn)priv)(diffbuf, buflen + mb[i].size);
 248                 free(diffbuf);
 249                 diffbuf = NULL;
 250                 buflen = 0;
 251         }
 252         if (diffbuf) {
 253                 ((linediff_fn)priv)(diffbuf, buflen);
 254                 free(diffbuf);
 255                 diffbuf = NULL;
 256                 buflen = 0;
 257         }
 258         return 0;
 259 }
 260
 261 int cgit_diff_files(const unsigned char *old_sha1,
 262                     const unsigned char *new_sha1, unsigned long *old_size,
 263                     unsigned long *new_size, int *binary, int context,
 264                     int ignorews, linediff_fn fn)
 265 {
 266         mmfile_t file1, file2;
 267         xpparam_t diff_params;
 268         xdemitconf_t emit_params;
 269         xdemitcb_t emit_cb;
 270
 271         if (!load_mmfile(&file1, old_sha1) || !load_mmfile(&file2, new_sha1))
 272                 return 1;
 273
 274         *old_size = file1.size;
 275         *new_size = file2.size;
 276
 277         if ((file1.ptr && buffer_is_binary(file1.ptr, file1.size)) ||
 278             (file2.ptr && buffer_is_binary(file2.ptr, file2.size))) {
 279                 *binary = 1;
 280                 if (file1.size)
 281                         free(file1.ptr);
 282                 if (file2.size)
 283                         free(file2.ptr);
 284                 return 0;
 285         }
 286
 287         memset(&diff_params, 0, sizeof(diff_params));
 288         memset(&emit_params, 0, sizeof(emit_params));
 289         memset(&emit_cb, 0, sizeof(emit_cb));
 290         diff_params.flags = XDF_NEED_MINIMAL;
 291         if (ignorews)
 292                 diff_params.flags |= XDF_IGNORE_WHITESPACE;
 293         emit_params.ctxlen = context > 0 ? context : 3;
 294         emit_params.flags = XDL_EMIT_FUNCNAMES;
 295         emit_cb.outf = filediff_cb;
 296         emit_cb.priv = fn;
 297         xdl_diff(&file1, &file2, &diff_params, &emit_params, &emit_cb);
 298         if (file1.size)
 299                 free(file1.ptr);
 300         if (file2.size)
 301                 free(file2.ptr);
 302         return 0;
 303 }
 304
 305 void cgit_diff_tree(const unsigned char *old_sha1,
 306                     const unsigned char *new_sha1,
 307                     filepair_fn fn, const char *prefix, int ignorews)
 308 {
 309         struct diff_options opt;
 310         int prefixlen;
 311
 312         diff_setup(&opt);
 313         opt.output_format = DIFF_FORMAT_CALLBACK;
 314         opt.detect_rename = 1;
 315         opt.rename_limit = ctx.cfg.renamelimit;
 316         DIFF_OPT_SET(&opt, RECURSIVE);
 317         if (ignorews)
 318                 DIFF_XDL_SET(&opt, IGNORE_WHITESPACE);
 319         opt.format_callback = cgit_diff_tree_cb;
 320         opt.format_callback_data = fn;
 321         if (prefix) {
 322                 opt.nr_paths = 1;
 323                 opt.paths = &prefix;
 324                 prefixlen = strlen(prefix);
 325                 opt.pathlens = &prefixlen;
 326         }
 327         diff_setup_done(&opt);
 328
 329         if (old_sha1 && !is_null_sha1(old_sha1))
 330                 diff_tree_sha1(old_sha1, new_sha1, "", &opt);
 331         else
 332                 diff_root_tree_sha1(new_sha1, "", &opt);
 333         diffcore_std(&opt);
 334         diff_flush(&opt);
 335 }
 336
 337 void cgit_diff_commit(struct commit *commit, filepair_fn fn, const char *prefix)
 338 {
 339         unsigned char *old_sha1 = NULL;
 340
 341         if (commit->parents)
 342                 old_sha1 = commit->parents->item->object.sha1;
 343         cgit_diff_tree(old_sha1, commit->object.sha1, fn, prefix,
 344                        ctx.qry.ignorews);
 345 }
 346
 347 int cgit_parse_snapshots_mask(const char *str)
 348 {
 349         const struct cgit_snapshot_format *f;
 350         static const char *delim = " \t,:/|;";
 351         int tl, sl, rv = 0;
 352
 353         /* favor legacy setting */
 354         if(atoi(str))
 355                 return 1;
 356         for(;;) {
 357                 str += strspn(str,delim);
 358                 tl = strcspn(str,delim);
 359                 if (!tl)
 360                         break;
 361                 for (f = cgit_snapshot_formats; f->suffix; f++) {
 362                         sl = strlen(f->suffix);
 363                         if((tl == sl && !strncmp(f->suffix, str, tl)) ||
 364                            (tl == sl-1 && !strncmp(f->suffix+1, str, tl-1))) {
 365                                 rv |= f->bit;
 366                                 break;
 367                         }
 368                 }
 369                 str += tl;
 370         }
 371         return rv;
 372 }
 373
 374 typedef struct {
 375         char * name;
 376         char * value;
 377 } cgit_env_var;
 378
 379 void cgit_prepare_repo_env(struct cgit_repo * repo)
 380 {
 381         cgit_env_var env_vars[] = {
 382                 { .name = "CGIT_REPO_URL", .value = repo->url },
 383                 { .name = "CGIT_REPO_NAME", .value = repo->name },
 384                 { .name = "CGIT_REPO_PATH", .value = repo->path },
 385                 { .name = "CGIT_REPO_OWNER", .value = repo->owner },
 386                 { .name = "CGIT_REPO_DEFBRANCH", .value = repo->defbranch },
 387                 { .name = "CGIT_REPO_SECTION", .value = repo->section },
 388                 { .name = "CGIT_REPO_CLONE_URL", .value = repo->clone_url }
 389         };
 390         int env_var_count = ARRAY_SIZE(env_vars);
 391         cgit_env_var *p, *q;
 392         static char *warn = "cgit warning: failed to set env: %s=%s\n";
 393
 394         p = env_vars;
 395         q = p + env_var_count;
 396         for (; p < q; p++)
 397                 if (setenv(p->name, p->value, 1))
 398                         fprintf(stderr, warn, p->name, p->value);
 399 }
 400
 401 int cgit_open_filter(struct cgit_filter *filter)
 402 {
 403
 404         filter->old_stdout = chk_positive(dup(STDOUT_FILENO),
 405                 "Unable to duplicate STDOUT");
 406         chk_zero(pipe(filter->pipe_fh), "Unable to create pipe to subprocess");
 407         filter->pid = chk_non_negative(fork(), "Unable to create subprocess");
 408         if (filter->pid == 0) {
 409                 close(filter->pipe_fh[1]);
 410                 chk_non_negative(dup2(filter->pipe_fh[0], STDIN_FILENO),
 411                         "Unable to use pipe as STDIN");
 412                 execvp(filter->cmd, filter->argv);
 413                 die("Unable to exec subprocess %s: %s (%d)", filter->cmd,
 414                         strerror(errno), errno);
 415         }
 416         close(filter->pipe_fh[0]);
 417         chk_non_negative(dup2(filter->pipe_fh[1], STDOUT_FILENO),
 418                 "Unable to use pipe as STDOUT");
 419         close(filter->pipe_fh[1]);
 420         return 0;
 421 }
 422
 423 int cgit_close_filter(struct cgit_filter *filter)
 424 {
 425         chk_non_negative(dup2(filter->old_stdout, STDOUT_FILENO),
 426                 "Unable to restore STDOUT");
 427         close(filter->old_stdout);
 428         if (filter->pid < 0)
 429                 return 0;
 430         waitpid(filter->pid, &filter->exitstatus, 0);
 431         if (WIFEXITED(filter->exitstatus) && !WEXITSTATUS(filter->exitstatus))
 432                 return 0;
 433         die("Subprocess %s exited abnormally", filter->cmd);
 434 }
 435
 436 /* Read the content of the specified file into a newly allocated buffer,
 437  * zeroterminate the buffer and return 0 on success, errno otherwise.
 438  */
 439 int readfile(const char *path, char **buf, size_t *size)
 440 {
 441         int fd, e;
 442         struct stat st;
 443
 444         fd = open(path, O_RDONLY);
 445         if (fd == -1)
 446                 return errno;
 447         if (fstat(fd, &st)) {
 448                 e = errno;
 449                 close(fd);
 450                 return e;
 451         }
 452         if (!S_ISREG(st.st_mode)) {
 453                 close(fd);
 454                 return EISDIR;
 455         }
 456         *buf = xmalloc(st.st_size + 1);
 457         *size = read_in_full(fd, *buf, st.st_size);
 458         e = errno;
 459         (*buf)[*size] = '\0';
 460         close(fd);
 461         return (*size == st.st_size ? 0 : e);
 462 }
 463
 464 int is_token_char(char c)
 465 {
 466         return isalnum(c) || c == '_';
 467 }
 468
 469 /* Replace name with getenv(name), return pointer to zero-terminating char
 470  */
 471 char *expand_macro(char *name, int maxlength)
 472 {
 473         char *value;
 474         int len;
 475
 476         len = 0;
 477         value = getenv(name);
 478         if (value) {
 479                 len = strlen(value);
 480                 if (len > maxlength)
 481                         len = maxlength;
 482                 strncpy(name, value, len);
 483         }
 484         return name + len;
 485 }
 486
 487 #define EXPBUFSIZE (1024 * 8)
 488
 489 /* Replace all tokens prefixed by '$' in the specified text with the
 490  * value of the named environment variable.
 491  * NB: the return value is a static buffer, i.e. it must be strdup'd
 492  * by the caller.
 493  */
 494 char *expand_macros(const char *txt)
 495 {
 496         static char result[EXPBUFSIZE];
 497         char *p, *start;
 498         int len;
 499
 500         p = result;
 501         start = NULL;
 502         while (p < result + EXPBUFSIZE - 1 && txt && *txt) {
 503                 *p = *txt;
 504                 if (start) {
 505                         if (!is_token_char(*txt)) {
 506                                 if (p - start > 0) {
 507                                         *p = '\0';
 508                                         len = result + EXPBUFSIZE - start - 1;
 509                                         p = expand_macro(start, len) - 1;
 510                                 }
 511                                 start = NULL;
 512                                 txt--;
 513                         }
 514                         p++;
 515                         txt++;
 516                         continue;
 517                 }
 518                 if (*txt == '$') {
 519                         start = p;
 520                         txt++;
 521                         continue;
 522                 }
 523                 p++;
 524                 txt++;
 525         }
 526         *p = '\0';
 527         if (start && p - start > 0) {
 528                 len = result + EXPBUFSIZE - start - 1;
 529                 p = expand_macro(start, len);
 530                 *p = '\0';
 531         }
 532         return result;
 533 }