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 #include "cache.h"
  11 #include "cmd.h"
  12 #include "configfile.h"
  13 #include "html.h"
  14 #include "ui-shared.h"
  15
  16 const char *cgit_version = CGIT_VERSION;
  17
  18 void config_cb(const char *name, const char *value)
  19 {
  20         if (!strcmp(name, "root-title"))
  21                 ctx.cfg.root_title = xstrdup(value);
  22         else if (!strcmp(name, "css"))
  23                 ctx.cfg.css = xstrdup(value);
  24         else if (!strcmp(name, "logo"))
  25                 ctx.cfg.logo = xstrdup(value);
  26         else if (!strcmp(name, "index-header"))
  27                 ctx.cfg.index_header = xstrdup(value);
  28         else if (!strcmp(name, "index-info"))
  29                 ctx.cfg.index_info = xstrdup(value);
  30         else if (!strcmp(name, "logo-link"))
  31                 ctx.cfg.logo_link = xstrdup(value);
  32         else if (!strcmp(name, "module-link"))
  33                 ctx.cfg.module_link = xstrdup(value);
  34         else if (!strcmp(name, "virtual-root")) {
  35                 ctx.cfg.virtual_root = trim_end(value, '/');
  36                 if (!ctx.cfg.virtual_root && (!strcmp(value, "/")))
  37                         ctx.cfg.virtual_root = "";
  38         } else if (!strcmp(name, "nocache"))
  39                 ctx.cfg.nocache = atoi(value);
  40         else if (!strcmp(name, "snapshots"))
  41                 ctx.cfg.snapshots = cgit_parse_snapshots_mask(value);
  42         else if (!strcmp(name, "enable-index-links"))
  43                 ctx.cfg.enable_index_links = atoi(value);
  44         else if (!strcmp(name, "enable-log-filecount"))
  45                 ctx.cfg.enable_log_filecount = atoi(value);
  46         else if (!strcmp(name, "enable-log-linecount"))
  47                 ctx.cfg.enable_log_linecount = atoi(value);
  48         else if (!strcmp(name, "cache-root"))
  49                 ctx.cfg.cache_root = xstrdup(value);
  50         else if (!strcmp(name, "cache-root-ttl"))
  51                 ctx.cfg.cache_root_ttl = atoi(value);
  52         else if (!strcmp(name, "cache-repo-ttl"))
  53                 ctx.cfg.cache_repo_ttl = atoi(value);
  54         else if (!strcmp(name, "cache-static-ttl"))
  55                 ctx.cfg.cache_static_ttl = atoi(value);
  56         else if (!strcmp(name, "cache-dynamic-ttl"))
  57                 ctx.cfg.cache_dynamic_ttl = atoi(value);
  58         else if (!strcmp(name, "max-message-length"))
  59                 ctx.cfg.max_msg_len = atoi(value);
  60         else if (!strcmp(name, "max-repodesc-length"))
  61                 ctx.cfg.max_repodesc_len = atoi(value);
  62         else if (!strcmp(name, "max-commit-count"))
  63                 ctx.cfg.max_commit_count = atoi(value);
  64         else if (!strcmp(name, "summary-log"))
  65                 ctx.cfg.summary_log = atoi(value);
  66         else if (!strcmp(name, "summary-branches"))
  67                 ctx.cfg.summary_branches = atoi(value);
  68         else if (!strcmp(name, "summary-tags"))
  69                 ctx.cfg.summary_tags = atoi(value);
  70         else if (!strcmp(name, "agefile"))
  71                 ctx.cfg.agefile = xstrdup(value);
  72         else if (!strcmp(name, "renamelimit"))
  73                 ctx.cfg.renamelimit = atoi(value);
  74         else if (!strcmp(name, "robots"))
  75                 ctx.cfg.robots = xstrdup(value);
  76         else if (!strcmp(name, "clone-prefix"))
  77                 ctx.cfg.clone_prefix = xstrdup(value);
  78         else if (!strcmp(name, "repo.group"))
  79                 ctx.cfg.repo_group = xstrdup(value);
  80         else if (!strcmp(name, "repo.url"))
  81                 ctx.repo = cgit_add_repo(value);
  82         else if (!strcmp(name, "repo.name"))
  83                 ctx.repo->name = xstrdup(value);
  84         else if (ctx.repo && !strcmp(name, "repo.path"))
  85                 ctx.repo->path = trim_end(value, '/');
  86         else if (ctx.repo && !strcmp(name, "repo.clone-url"))
  87                 ctx.repo->clone_url = xstrdup(value);
  88         else if (ctx.repo && !strcmp(name, "repo.desc"))
  89                 ctx.repo->desc = xstrdup(value);
  90         else if (ctx.repo && !strcmp(name, "repo.owner"))
  91                 ctx.repo->owner = xstrdup(value);
  92         else if (ctx.repo && !strcmp(name, "repo.defbranch"))
  93                 ctx.repo->defbranch = xstrdup(value);
  94         else if (ctx.repo && !strcmp(name, "repo.snapshots"))
  95                 ctx.repo->snapshots = ctx.cfg.snapshots & cgit_parse_snapshots_mask(value); /* XXX: &? */
  96         else if (ctx.repo && !strcmp(name, "repo.enable-log-filecount"))
  97                 ctx.repo->enable_log_filecount = ctx.cfg.enable_log_filecount * atoi(value);
  98         else if (ctx.repo && !strcmp(name, "repo.enable-log-linecount"))
  99                 ctx.repo->enable_log_linecount = ctx.cfg.enable_log_linecount * atoi(value);
 100         else if (ctx.repo && !strcmp(name, "repo.module-link"))
 101                 ctx.repo->module_link= xstrdup(value);
 102         else if (ctx.repo && !strcmp(name, "repo.readme") && value != NULL) {
 103                 if (*value == '/')
 104                         ctx.repo->readme = xstrdup(value);
 105                 else
 106                         ctx.repo->readme = xstrdup(fmt("%s/%s", ctx.repo->path, value));
 107         } else if (!strcmp(name, "include"))
 108                 parse_configfile(value, config_cb);
 109 }
 110
 111 static void querystring_cb(const char *name, const char *value)
 112 {
 113         if (!strcmp(name,"r")) {
 114                 ctx.qry.repo = xstrdup(value);
 115                 ctx.repo = cgit_get_repoinfo(value);
 116         } else if (!strcmp(name, "p")) {
 117                 ctx.qry.page = xstrdup(value);
 118         } else if (!strcmp(name, "url")) {
 119                 cgit_parse_url(value);
 120         } else if (!strcmp(name, "qt")) {
 121                 ctx.qry.grep = xstrdup(value);
 122         } else if (!strcmp(name, "q")) {
 123                 ctx.qry.search = xstrdup(value);
 124         } else if (!strcmp(name, "h")) {
 125                 ctx.qry.head = xstrdup(value);
 126                 ctx.qry.has_symref = 1;
 127         } else if (!strcmp(name, "id")) {
 128                 ctx.qry.sha1 = xstrdup(value);
 129                 ctx.qry.has_sha1 = 1;
 130         } else if (!strcmp(name, "id2")) {
 131                 ctx.qry.sha2 = xstrdup(value);
 132                 ctx.qry.has_sha1 = 1;
 133         } else if (!strcmp(name, "ofs")) {
 134                 ctx.qry.ofs = atoi(value);
 135         } else if (!strcmp(name, "path")) {
 136                 ctx.qry.path = trim_end(value, '/');
 137         } else if (!strcmp(name, "name")) {
 138                 ctx.qry.name = xstrdup(value);
 139         }
 140 }
 141
 142 static void prepare_context(struct cgit_context *ctx)
 143 {
 144         memset(ctx, 0, sizeof(ctx));
 145         ctx->cfg.agefile = "info/web/last-modified";
 146         ctx->cfg.cache_dynamic_ttl = 5;
 147         ctx->cfg.cache_max_create_time = 5;
 148         ctx->cfg.cache_repo_ttl = 5;
 149         ctx->cfg.cache_root = CGIT_CACHE_ROOT;
 150         ctx->cfg.cache_root_ttl = 5;
 151         ctx->cfg.cache_static_ttl = -1;
 152         ctx->cfg.css = "/cgit.css";
 153         ctx->cfg.logo = "/git-logo.png";
 154         ctx->cfg.max_commit_count = 50;
 155         ctx->cfg.max_lock_attempts = 5;
 156         ctx->cfg.max_msg_len = 60;
 157         ctx->cfg.max_repodesc_len = 60;
 158         ctx->cfg.module_link = "./?repo=%s&page=commit&id=%s";
 159         ctx->cfg.renamelimit = -1;
 160         ctx->cfg.robots = "index, nofollow";
 161         ctx->cfg.root_title = "Git repository browser";
 162         ctx->cfg.script_name = CGIT_SCRIPT_NAME;
 163         ctx->page.mimetype = "text/html";
 164         ctx->page.charset = PAGE_ENCODING;
 165         ctx->page.filename = NULL;
 166 }
 167
 168 static int cgit_prepare_cache(struct cacheitem *item)
 169 {
 170         if (!ctx.repo && ctx.qry.repo) {
 171                 ctx.page.title = fmt("%s - %s", ctx.cfg.root_title,
 172                                       "Bad request");
 173                 cgit_print_http_headers(&ctx);
 174                 cgit_print_docstart(&ctx);
 175                 cgit_print_pageheader(&ctx);
 176                 cgit_print_error(fmt("Unknown repo: %s", ctx.qry.repo));
 177                 cgit_print_docend();
 178                 return 0;
 179         }
 180
 181         if (!ctx.repo) {
 182                 item->name = xstrdup(fmt("%s/index.%s.html",
 183                                          ctx.cfg.cache_root,
 184                                          cache_safe_filename(ctx.qry.raw)));
 185                 item->ttl = ctx.cfg.cache_root_ttl;
 186                 return 1;
 187         }
 188
 189         if (!ctx.qry.page) {
 190                 item->name = xstrdup(fmt("%s/%s/index.%s.html", ctx.cfg.cache_root,
 191                                          cache_safe_filename(ctx.repo->url),
 192                                          cache_safe_filename(ctx.qry.raw)));
 193                 item->ttl = ctx.cfg.cache_repo_ttl;
 194         } else {
 195                 item->name = xstrdup(fmt("%s/%s/%s/%s.html", ctx.cfg.cache_root,
 196                                          cache_safe_filename(ctx.repo->url),
 197                                          ctx.qry.page,
 198                                          cache_safe_filename(ctx.qry.raw)));
 199                 if (ctx.qry.has_symref)
 200                         item->ttl = ctx.cfg.cache_dynamic_ttl;
 201                 else if (ctx.qry.has_sha1)
 202                         item->ttl = ctx.cfg.cache_static_ttl;
 203                 else
 204                         item->ttl = ctx.cfg.cache_repo_ttl;
 205         }
 206         return 1;
 207 }
 208
 209 struct refmatch {
 210         char *req_ref;
 211         char *first_ref;
 212         int match;
 213 };
 214
 215 int find_current_ref(const char *refname, const unsigned char *sha1,
 216                      int flags, void *cb_data)
 217 {
 218         struct refmatch *info;
 219
 220         info = (struct refmatch *)cb_data;
 221         if (!strcmp(refname, info->req_ref))
 222                 info->match = 1;
 223         if (!info->first_ref)
 224                 info->first_ref = xstrdup(refname);
 225         return info->match;
 226 }
 227
 228 char *find_default_branch(struct cgit_repo *repo)
 229 {
 230         struct refmatch info;
 231
 232         info.req_ref = repo->defbranch;
 233         info.first_ref = NULL;
 234         info.match = 0;
 235         for_each_branch_ref(find_current_ref, &info);
 236         if (info.match)
 237                 return info.req_ref;
 238         else
 239                 return info.first_ref;
 240 }
 241
 242 static int prepare_repo_cmd(struct cgit_context *ctx)
 243 {
 244         char *tmp;
 245         unsigned char sha1[20];
 246         int nongit = 0;
 247
 248         setenv("GIT_DIR", ctx->repo->path, 1);
 249         setup_git_directory_gently(&nongit);
 250         if (nongit) {
 251                 ctx->page.title = fmt("%s - %s", ctx->cfg.root_title,
 252                                       "config error");
 253                 tmp = fmt("Not a git repository: '%s'", ctx->repo->path);
 254                 ctx->repo = NULL;
 255                 cgit_print_http_headers(ctx);
 256                 cgit_print_docstart(ctx);
 257                 cgit_print_pageheader(ctx);
 258                 cgit_print_error(tmp);
 259                 cgit_print_docend();
 260                 return 1;
 261         }
 262         ctx->page.title = fmt("%s - %s", ctx->repo->name, ctx->repo->desc);
 263
 264         if (!ctx->qry.head) {
 265                 ctx->qry.head = xstrdup(find_default_branch(ctx->repo));
 266                 ctx->repo->defbranch = ctx->qry.head;
 267         }
 268
 269         if (!ctx->qry.head) {
 270                 cgit_print_http_headers(ctx);
 271                 cgit_print_docstart(ctx);
 272                 cgit_print_pageheader(ctx);
 273                 cgit_print_error("Repository seems to be empty");
 274                 cgit_print_docend();
 275                 return 1;
 276         }
 277
 278         if (get_sha1(ctx->qry.head, sha1)) {
 279                 tmp = xstrdup(ctx->qry.head);
 280                 ctx->qry.head = ctx->repo->defbranch;
 281                 cgit_print_http_headers(ctx);
 282                 cgit_print_docstart(ctx);
 283                 cgit_print_pageheader(ctx);
 284                 cgit_print_error(fmt("Invalid branch: %s", tmp));
 285                 cgit_print_docend();
 286                 return 1;
 287         }
 288         return 0;
 289 }
 290
 291 static void process_request(struct cgit_context *ctx)
 292 {
 293         struct cgit_cmd *cmd;
 294
 295         cmd = cgit_get_cmd(ctx);
 296         if (!cmd) {
 297                 ctx->page.title = "cgit error";
 298                 ctx->repo = NULL;
 299                 cgit_print_http_headers(ctx);
 300                 cgit_print_docstart(ctx);
 301                 cgit_print_pageheader(ctx);
 302                 cgit_print_error("Invalid request");
 303                 cgit_print_docend();
 304                 return;
 305         }
 306
 307         if (cmd->want_repo && prepare_repo_cmd(ctx))
 308                 return;
 309
 310         if (cmd->want_layout) {
 311                 cgit_print_http_headers(ctx);
 312                 cgit_print_docstart(ctx);
 313                 cgit_print_pageheader(ctx);
 314         }
 315
 316         cmd->fn(ctx);
 317
 318         if (cmd->want_layout)
 319                 cgit_print_docend();
 320 }
 321
 322 static long ttl_seconds(long ttl)
 323 {
 324         if (ttl<0)
 325                 return 60 * 60 * 24 * 365;
 326         else
 327                 return ttl * 60;
 328 }
 329
 330 static void cgit_fill_cache(struct cacheitem *item, int use_cache)
 331 {
 332         int stdout2;
 333
 334         if (use_cache) {
 335                 stdout2 = chk_positive(dup(STDOUT_FILENO),
 336                                        "Preserving STDOUT");
 337                 chk_zero(close(STDOUT_FILENO), "Closing STDOUT");
 338                 chk_positive(dup2(item->fd, STDOUT_FILENO), "Dup2(cachefile)");
 339         }
 340
 341         ctx.page.modified = time(NULL);
 342         ctx.page.expires = ctx.page.modified + ttl_seconds(item->ttl);
 343         process_request(&ctx);
 344
 345         if (use_cache) {
 346                 chk_zero(close(STDOUT_FILENO), "Close redirected STDOUT");
 347                 chk_positive(dup2(stdout2, STDOUT_FILENO),
 348                              "Restoring original STDOUT");
 349                 chk_zero(close(stdout2), "Closing temporary STDOUT");
 350         }
 351 }
 352
 353 static void cgit_check_cache(struct cacheitem *item)
 354 {
 355         int i = 0;
 356
 357  top:
 358         if (++i > ctx.cfg.max_lock_attempts) {
 359                 die("cgit_refresh_cache: unable to lock %s: %s",
 360                     item->name, strerror(errno));
 361         }
 362         if (!cache_exist(item)) {
 363                 if (!cache_lock(item)) {
 364                         sleep(1);
 365                         goto top;
 366                 }
 367                 if (!cache_exist(item)) {
 368                         cgit_fill_cache(item, 1);
 369                         cache_unlock(item);
 370                 } else {
 371                         cache_cancel_lock(item);
 372                 }
 373         } else if (cache_expired(item) && cache_lock(item)) {
 374                 if (cache_expired(item)) {
 375                         cgit_fill_cache(item, 1);
 376                         cache_unlock(item);
 377                 } else {
 378                         cache_cancel_lock(item);
 379                 }
 380         }
 381 }
 382
 383 static void cgit_print_cache(struct cacheitem *item)
 384 {
 385         static char buf[4096];
 386         ssize_t i;
 387
 388         int fd = open(item->name, O_RDONLY);
 389         if (fd<0)
 390                 die("Unable to open cached file %s", item->name);
 391
 392         while((i=read(fd, buf, sizeof(buf))) > 0)
 393                 write(STDOUT_FILENO, buf, i);
 394
 395         close(fd);
 396 }
 397
 398 static void cgit_parse_args(int argc, const char **argv)
 399 {
 400         int i;
 401
 402         for (i = 1; i < argc; i++) {
 403                 if (!strncmp(argv[i], "--cache=", 8)) {
 404                         ctx.cfg.cache_root = xstrdup(argv[i]+8);
 405                 }
 406                 if (!strcmp(argv[i], "--nocache")) {
 407                         ctx.cfg.nocache = 1;
 408                 }
 409                 if (!strncmp(argv[i], "--query=", 8)) {
 410                         ctx.qry.raw = xstrdup(argv[i]+8);
 411                 }
 412                 if (!strncmp(argv[i], "--repo=", 7)) {
 413                         ctx.qry.repo = xstrdup(argv[i]+7);
 414                 }
 415                 if (!strncmp(argv[i], "--page=", 7)) {
 416                         ctx.qry.page = xstrdup(argv[i]+7);
 417                 }
 418                 if (!strncmp(argv[i], "--head=", 7)) {
 419                         ctx.qry.head = xstrdup(argv[i]+7);
 420                         ctx.qry.has_symref = 1;
 421                 }
 422                 if (!strncmp(argv[i], "--sha1=", 7)) {
 423                         ctx.qry.sha1 = xstrdup(argv[i]+7);
 424                         ctx.qry.has_sha1 = 1;
 425                 }
 426                 if (!strncmp(argv[i], "--ofs=", 6)) {
 427                         ctx.qry.ofs = atoi(argv[i]+6);
 428                 }
 429         }
 430 }
 431
 432 int main(int argc, const char **argv)
 433 {
 434         struct cacheitem item;
 435         const char *cgit_config_env = getenv("CGIT_CONFIG");
 436
 437         prepare_context(&ctx);
 438         item.st.st_mtime = time(NULL);
 439         cgit_repolist.length = 0;
 440         cgit_repolist.count = 0;
 441         cgit_repolist.repos = NULL;
 442
 443         parse_configfile(cgit_config_env ? cgit_config_env : CGIT_CONFIG,
 444                          config_cb);
 445         ctx.repo = NULL;
 446         if (getenv("SCRIPT_NAME"))
 447                 ctx.cfg.script_name = xstrdup(getenv("SCRIPT_NAME"));
 448         if (getenv("QUERY_STRING"))
 449                 ctx.qry.raw = xstrdup(getenv("QUERY_STRING"));
 450         cgit_parse_args(argc, argv);
 451         http_parse_querystring(ctx.qry.raw, querystring_cb);
 452         if (!cgit_prepare_cache(&item))
 453                 return 0;
 454         if (ctx.cfg.nocache) {
 455                 cgit_fill_cache(&item, 0);
 456         } else {
 457                 cgit_check_cache(&item);
 458                 cgit_print_cache(&item);
 459         }
 460         return 0;
 461 }