cgit.c

   1 /* cgit.c: cgi for the git scm
   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 const char cgit_version[] = CGIT_VERSION;
  12
  13 const char cgit_doctype[] =
  14 "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\"\n"
  15 "  \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">\n";
  16
  17 const char cgit_error[] =
  18 "<div class='error'>%s</div>";
  19
  20 const char cgit_lib_error[] =
  21 "<div class='error'>%s: %s</div>";
  22
  23 int htmlfd = 0;
  24
  25 char *cgit_root         = "/usr/src/git";
  26 char *cgit_root_title   = "Git repository browser";
  27 char *cgit_css          = "/cgit.css";
  28 char *cgit_logo         = "/git-logo.png";
  29 char *cgit_logo_link    = "http://www.kernel.org/pub/software/scm/git/docs/";
  30 char *cgit_virtual_root = NULL;
  31
  32 char *cgit_cache_root   = "/var/cache/cgit";
  33
  34 int cgit_cache_root_ttl        =  5;
  35 int cgit_cache_repo_ttl        =  5;
  36 int cgit_cache_dynamic_ttl     =  5;
  37 int cgit_cache_static_ttl      = -1;
  38 int cgit_cache_max_create_time =  5;
  39
  40 char *cgit_repo_name    = NULL;
  41 char *cgit_repo_desc    = NULL;
  42 char *cgit_repo_owner   = NULL;
  43
  44 int cgit_query_has_symref = 0;
  45 int cgit_query_has_sha1   = 0;
  46
  47 char *cgit_querystring  = NULL;
  48 char *cgit_query_repo   = NULL;
  49 char *cgit_query_page   = NULL;
  50 char *cgit_query_head   = NULL;
  51 char *cgit_query_sha1   = NULL;
  52
  53 struct cacheitem cacheitem;
  54
  55 int cgit_parse_query(char *txt, configfn fn)
  56 {
  57         char *t, *value = NULL, c;
  58
  59         if (!txt)
  60                 return 0;
  61
  62         t = txt = xstrdup(txt);
  63
  64         while((c=*t) != '\0') {
  65                 if (c=='=') {
  66                         *t = '\0';
  67                         value = t+1;
  68                 } else if (c=='&') {
  69                         *t = '\0';
  70                         (*fn)(txt, value);
  71                         txt = t+1;
  72                         value = NULL;
  73                 }
  74                 t++;
  75         }
  76         if (t!=txt)
  77                 (*fn)(txt, value);
  78         return 0;
  79 }
  80
  81 void cgit_global_config_cb(const char *name, const char *value)
  82 {
  83         if (!strcmp(name, "root"))
  84                 cgit_root = xstrdup(value);
  85         else if (!strcmp(name, "root-title"))
  86                 cgit_root_title = xstrdup(value);
  87         else if (!strcmp(name, "css"))
  88                 cgit_css = xstrdup(value);
  89         else if (!strcmp(name, "logo"))
  90                 cgit_logo = xstrdup(value);
  91         else if (!strcmp(name, "logo-link"))
  92                 cgit_logo_link = xstrdup(value);
  93         else if (!strcmp(name, "virtual-root"))
  94                 cgit_virtual_root = xstrdup(value);
  95 }
  96
  97 void cgit_repo_config_cb(const char *name, const char *value)
  98 {
  99         if (!strcmp(name, "name"))
 100                 cgit_repo_name = xstrdup(value);
 101         else if (!strcmp(name, "desc"))
 102                 cgit_repo_desc = xstrdup(value);
 103         else if (!strcmp(name, "owner"))
 104                 cgit_repo_owner = xstrdup(value);
 105 }
 106
 107 void cgit_querystring_cb(const char *name, const char *value)
 108 {
 109         if (!strcmp(name,"r"))
 110                 cgit_query_repo = xstrdup(value);
 111         else if (!strcmp(name, "p"))
 112                 cgit_query_page = xstrdup(value);
 113         else if (!strcmp(name, "h")) {
 114                 cgit_query_head = xstrdup(value);
 115                 cgit_query_has_symref = 1;
 116         } else if (!strcmp(name, "id")) {
 117                 cgit_query_sha1 = xstrdup(value);
 118                 cgit_query_has_sha1 = 1;
 119         }
 120 }
 121
 122 char *cgit_repourl(const char *reponame)
 123 {
 124         if (cgit_virtual_root) {
 125                 return fmt("%s/%s/", cgit_virtual_root, reponame);
 126         } else {
 127                 return fmt("?r=%s", reponame);
 128         }
 129 }
 130
 131 char *cgit_pageurl(const char *reponame, const char *pagename,
 132                    const char *query)
 133 {
 134         if (cgit_virtual_root) {
 135                 return fmt("%s/%s/%s/?%s", cgit_virtual_root, reponame,
 136                            pagename, query);
 137         } else {
 138                 return fmt("?r=%s&p=%s&%s", reponame, pagename, query);
 139         }
 140 }
 141
 142 static int cgit_print_branch_cb(const char *refname, const unsigned char *sha1,
 143                                 int flags, void *cb_data)
 144 {
 145         struct commit *commit;
 146         char buf[256], *url;
 147
 148         commit = lookup_commit(sha1);
 149         if (commit && !parse_commit(commit)){
 150                 html("<tr><td>");
 151                 url = cgit_pageurl(cgit_query_repo, "log",
 152                                    fmt("h=%s", refname));
 153                 html_link_open(url, NULL, NULL);
 154                 strncpy(buf, refname, sizeof(buf));
 155                 html_txt(buf);
 156                 html_link_close();
 157                 html("</td><td>");
 158                 pretty_print_commit(CMIT_FMT_ONELINE, commit, ~0, buf,
 159                                     sizeof(buf), 0, NULL, NULL, 0);
 160                 html_txt(buf);
 161                 html("</td></tr>\n");
 162         } else {
 163                 html("<tr><td>");
 164                 html_txt(buf);
 165                 html("</td><td>");
 166                 htmlf("*** bad ref %s", sha1_to_hex(sha1));
 167                 html("</td></tr>\n");
 168         }
 169         return 0;
 170 }
 171
 172 /* Sun, 06 Nov 1994 08:49:37 GMT */
 173 static char *http_date(time_t t)
 174 {
 175         static char day[][4] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
 176         static char month[][4] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
 177                                   "Jul", "Aug", "Sep", "Oct", "Now", "Dec"};
 178         struct tm *tm = gmtime(&t);
 179         return fmt("%s, %02d %s %04d %02d:%02d:%02d GMT", day[tm->tm_wday],
 180                    tm->tm_mday, month[tm->tm_mon], 1900+tm->tm_year,
 181                    tm->tm_hour, tm->tm_min, tm->tm_sec);
 182 }
 183
 184 static int ttl_seconds(int ttl)
 185 {
 186         if (ttl<0)
 187                 return 60 * 60 * 24 * 365;
 188         else
 189                 return ttl * 60;
 190 }
 191
 192 static void cgit_print_docstart(char *title)
 193 {
 194         html("Content-Type: text/html; charset=utf-8\n");
 195         htmlf("Last-Modified: %s\n", http_date(cacheitem.st.st_mtime));
 196         htmlf("Expires: %s\n", http_date(cacheitem.st.st_mtime +
 197                                          ttl_seconds(cacheitem.ttl)));
 198         html("\n");
 199         html(cgit_doctype);
 200         html("<html>\n");
 201         html("<head>\n");
 202         html("<title>");
 203         html_txt(title);
 204         html("</title>\n");
 205         htmlf("<meta name='generator' content='cgit v%s'/>\n", cgit_version);
 206         html("<link rel='stylesheet' type='text/css' href='");
 207         html_attr(cgit_css);
 208         html("'/>\n");
 209         html("</head>\n");
 210         html("<body>\n");
 211 }
 212
 213 static void cgit_print_docend()
 214 {
 215         html("</body>\n</html>\n");
 216 }
 217
 218 static void cgit_print_pageheader(char *title)
 219 {
 220         html("<div id='header'>");
 221         htmlf("<a href='%s'>", cgit_logo_link);
 222         htmlf("<img id='logo' src='%s'/>\n", cgit_logo);
 223         htmlf("</a>");
 224         html_txt(title);
 225         html("</div>");
 226 }
 227
 228 static void cgit_print_repolist()
 229 {
 230         DIR *d;
 231         struct dirent *de;
 232         struct stat st;
 233         char *name;
 234
 235         chdir(cgit_root);
 236         cgit_print_docstart(cgit_root_title);
 237         cgit_print_pageheader(cgit_root_title);
 238
 239         if (!(d = opendir("."))) {
 240                 htmlf(cgit_lib_error, "Unable to scan repository directory",
 241                       strerror(errno));
 242                 cgit_print_docend();
 243                 return;
 244         }
 245
 246         html("<h2>Repositories</h2>\n");
 247         html("<table class='list'>");
 248         html("<tr><th>Name</th><th>Description</th><th>Owner</th></tr>\n");
 249         while ((de = readdir(d)) != NULL) {
 250                 if (de->d_name[0] == '.')
 251                         continue;
 252                 if (stat(de->d_name, &st) < 0)
 253                         continue;
 254                 if (!S_ISDIR(st.st_mode))
 255                         continue;
 256
 257                 cgit_repo_name = cgit_repo_desc = cgit_repo_owner = NULL;
 258                 name = fmt("%s/info/cgit", de->d_name);
 259                 if (cgit_read_config(name, cgit_repo_config_cb))
 260                         continue;
 261
 262                 html("<tr><td>");
 263                 html_link_open(cgit_repourl(de->d_name), NULL, NULL);
 264                 html_txt(cgit_repo_name);
 265                 html_link_close();
 266                 html("</td><td>");
 267                 html_txt(cgit_repo_desc);
 268                 html("</td><td>");
 269                 html_txt(cgit_repo_owner);
 270                 html("</td></tr>\n");
 271         }
 272         closedir(d);
 273         html("</table>");
 274         cgit_print_docend();
 275 }
 276
 277 static void cgit_print_branches()
 278 {
 279         html("<table class='list'>");
 280         html("<tr><th>Branch name</th><th>Head commit</th></tr>\n");
 281         for_each_branch_ref(cgit_print_branch_cb, NULL);
 282         html("</table>");
 283 }
 284
 285 static int get_one_line(char *txt)
 286 {
 287         char *t;
 288
 289         for(t=txt; *t != '\n' && t != '\0'; t++)
 290                 ;
 291         *t = '\0';
 292         return t-txt-1;
 293 }
 294
 295 static void cgit_print_commit_shortlog(struct commit *commit)
 296 {
 297         char *h, *t, *p;
 298         char *tree = NULL, *author = NULL, *subject = NULL;
 299         int len;
 300         time_t sec;
 301         struct tm *time;
 302         char buf[32];
 303
 304         h = t = commit->buffer;
 305
 306         if (strncmp(h, "tree ", 5))
 307                 die("Bad commit format: %s",
 308                     sha1_to_hex(commit->object.sha1));
 309
 310         len = get_one_line(h);
 311         tree = h+5;
 312         h += len + 2;
 313
 314         while (!strncmp(h, "parent ", 7))
 315                 h += get_one_line(h) + 2;
 316
 317         if (!strncmp(h, "author ", 7)) {
 318                 author = h+7;
 319                 h += get_one_line(h) + 2;
 320                 t = author;
 321                 while(t!=h && *t!='<')
 322                         t++;
 323                 *t='\0';
 324                 p = t;
 325                 while(--t!=author && *t==' ')
 326                         *t='\0';
 327                 while(++p!=h && *p!='>')
 328                         ;
 329                 while(++p!=h && !isdigit(*p))
 330                         ;
 331
 332                 t = p;
 333                 while(++p && isdigit(*p))
 334                         ;
 335                 *p = '\0';
 336                 sec = atoi(t);
 337                 time = gmtime(&sec);
 338         }
 339
 340         while((len = get_one_line(h)) > 0)
 341                 h += len+2;
 342
 343         h++;
 344         len = get_one_line(h);
 345
 346         subject = h;
 347
 348         html("<tr><td>");
 349         strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", time);
 350         html_txt(buf);
 351         html("</td><td>");
 352         char *qry = fmt("id=%s", sha1_to_hex(commit->object.sha1));
 353         char *url = cgit_pageurl(cgit_query_repo, "view", qry);
 354         html_link_open(url, NULL, NULL);
 355         html_txt(subject);
 356         html_link_close();
 357         html("</td><td>");
 358         html_txt(author);
 359         html("</td></tr>\n");
 360 }
 361
 362 static void cgit_print_log(const char *tip, int ofs, int cnt)
 363 {
 364         struct rev_info rev;
 365         struct commit *commit;
 366         const char *argv[2] = {NULL, tip};
 367         int n = 0;
 368
 369         init_revisions(&rev, NULL);
 370         rev.abbrev = DEFAULT_ABBREV;
 371         rev.commit_format = CMIT_FMT_DEFAULT;
 372         rev.verbose_header = 1;
 373         rev.show_root_diff = 0;
 374         setup_revisions(2, argv, &rev, NULL);
 375         prepare_revision_walk(&rev);
 376
 377         html("<h2>Log</h2>");
 378         html("<table class='list'>");
 379         html("<tr><th>Date</th><th>Message</th><th>Author</th></tr>\n");
 380         while ((commit = get_revision(&rev)) != NULL && n++ < 100) {
 381                 cgit_print_commit_shortlog(commit);
 382                 free(commit->buffer);
 383                 commit->buffer = NULL;
 384                 free_commit_list(commit->parents);
 385                 commit->parents = NULL;
 386         }
 387         html("</table>\n");
 388 }
 389
 390 static void cgit_print_repo_summary()
 391 {
 392         html("<h2>");
 393         html_txt("Repo summary page");
 394         html("</h2>");
 395         cgit_print_branches();
 396 }
 397
 398 static void cgit_print_object(char *hex)
 399 {
 400         unsigned char sha1[20];
 401         //struct object *object;
 402         char type[20];
 403         unsigned char *buf;
 404         unsigned long size;
 405
 406         if (get_sha1_hex(hex, sha1)){
 407                 htmlf(cgit_error, "Bad hex value");
 408                 return;
 409         }
 410
 411         if (sha1_object_info(sha1, type, NULL)){
 412                 htmlf(cgit_error, "Bad object name");
 413                 return;
 414         }
 415
 416         buf = read_sha1_file(sha1, type, &size);
 417         if (!buf) {
 418                 htmlf(cgit_error, "Error reading object");
 419                 return;
 420         }
 421
 422         buf[size] = '\0';
 423         html("<h2>Object view</h2>");
 424         htmlf("sha1=%s<br/>type=%s<br/>size=%i<br/>", hex, type, size);
 425         html("<pre>");
 426         html_txt(buf);
 427         html("</pre>");
 428 }
 429
 430 static void cgit_print_repo_page()
 431 {
 432         if (chdir(fmt("%s/%s", cgit_root, cgit_query_repo)) ||
 433             cgit_read_config("info/cgit", cgit_repo_config_cb)) {
 434                 char *title = fmt("%s - %s", cgit_root_title, "Bad request");
 435                 cgit_print_docstart(title);
 436                 cgit_print_pageheader(title);
 437                 htmlf(cgit_lib_error, "Unable to scan repository",
 438                       strerror(errno));
 439                 cgit_print_docend();
 440                 return;
 441         }
 442         setenv("GIT_DIR", fmt("%s/%s", cgit_root, cgit_query_repo), 1);
 443         char *title = fmt("%s - %s", cgit_repo_name, cgit_repo_desc);
 444         cgit_print_docstart(title);
 445         cgit_print_pageheader(title);
 446         if (!cgit_query_page)
 447                 cgit_print_repo_summary();
 448         else if (!strcmp(cgit_query_page, "log")) {
 449                 cgit_print_log(cgit_query_head, 0, 100);
 450         } else if (!strcmp(cgit_query_page, "view")) {
 451                 cgit_print_object(cgit_query_sha1);
 452         }
 453         cgit_print_docend();
 454 }
 455
 456 static void cgit_fill_cache(struct cacheitem *item)
 457 {
 458         htmlfd = item->fd;
 459         item->st.st_mtime = time(NULL);
 460         if (cgit_query_repo)
 461                 cgit_print_repo_page();
 462         else
 463                 cgit_print_repolist();
 464 }
 465
 466 static void cgit_refresh_cache(struct cacheitem *item)
 467 {
 468         cache_prepare(item);
 469  top:
 470         if (!cache_exist(item)) {
 471                 if (!cache_lock(item)) {
 472                         sched_yield();
 473                         goto top;
 474                 }
 475                 if (!cache_exist(item))
 476                         cgit_fill_cache(item);
 477                 cache_unlock(item);
 478         } else if (cache_expired(item) && cache_lock(item)) {
 479                 if (cache_expired(item))
 480                         cgit_fill_cache(item);
 481                 cache_unlock(item);
 482         }
 483 }
 484
 485 static void cgit_print_cache(struct cacheitem *item)
 486 {
 487         static char buf[4096];
 488         ssize_t i;
 489
 490         int fd = open(item->name, O_RDONLY);
 491         if (fd<0)
 492                 die("Unable to open cached file %s", item->name);
 493
 494         while((i=read(fd, buf, sizeof(buf))) > 0)
 495                 write(STDOUT_FILENO, buf, i);
 496
 497         close(fd);
 498 }
 499
 500 int main(int argc, const char **argv)
 501 {
 502         cgit_read_config("/etc/cgitrc", cgit_global_config_cb);
 503         cgit_querystring = xstrdup(getenv("QUERY_STRING"));
 504         cgit_parse_query(cgit_querystring, cgit_querystring_cb);
 505         cgit_refresh_cache(&cacheitem);
 506         cgit_print_cache(&cacheitem);
 507         return 0;
 508 }