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 static int cgit_prepare_cache(struct cacheitem *item)
  12 {
  13         if (!cgit_repo && cgit_query_repo) {
  14                 char *title = fmt("%s - %s", cgit_root_title, "Bad request");
  15                 cgit_print_docstart(title, item);
  16                 cgit_print_pageheader(title, 0);
  17                 cgit_print_error(fmt("Unknown repo: %s", cgit_query_repo));
  18                 cgit_print_docend();
  19                 return 0;
  20         }
  21
  22         if (!cgit_repo) {
  23                 item->name = xstrdup(fmt("%s/index.html", cgit_cache_root));
  24                 item->ttl = cgit_cache_root_ttl;
  25                 return 1;
  26         }
  27
  28         if (!cgit_cmd) {
  29                 item->name = xstrdup(fmt("%s/%s/index.%s.html", cgit_cache_root,
  30                                          cache_safe_filename(cgit_repo->url),
  31                                          cache_safe_filename(cgit_querystring)));
  32                 item->ttl = cgit_cache_repo_ttl;
  33         } else {
  34                 item->name = xstrdup(fmt("%s/%s/%s/%s.html", cgit_cache_root,
  35                                          cache_safe_filename(cgit_repo->url),
  36                                          cgit_query_page,
  37                                          cache_safe_filename(cgit_querystring)));
  38                 if (cgit_query_has_symref)
  39                         item->ttl = cgit_cache_dynamic_ttl;
  40                 else if (cgit_query_has_sha1)
  41                         item->ttl = cgit_cache_static_ttl;
  42                 else
  43                         item->ttl = cgit_cache_repo_ttl;
  44         }
  45         return 1;
  46 }
  47
  48 struct refmatch {
  49         char *req_ref;
  50         char *first_ref;
  51         int match;
  52 };
  53
  54 int find_current_ref(const char *refname, const unsigned char *sha1,
  55                      int flags, void *cb_data)
  56 {
  57         struct refmatch *info;
  58
  59         info = (struct refmatch *)cb_data;
  60         if (!strcmp(refname, info->req_ref))
  61                 info->match = 1;
  62         if (!info->first_ref)
  63                 info->first_ref = xstrdup(refname);
  64         return info->match;
  65 }
  66
  67 char *find_default_branch(struct repoinfo *repo)
  68 {
  69         struct refmatch info;
  70
  71         info.req_ref = repo->defbranch;
  72         info.first_ref = NULL;
  73         info.match = 0;
  74         for_each_branch_ref(find_current_ref, &info);
  75         if (info.match)
  76                 return info.req_ref;
  77         else
  78                 return info.first_ref;
  79 }
  80
  81 static void cgit_print_repo_page(struct cacheitem *item)
  82 {
  83         char *title, *tmp;
  84         int show_search;
  85         unsigned char sha1[20];
  86
  87         if (chdir(cgit_repo->path)) {
  88                 title = fmt("%s - %s", cgit_root_title, "Bad request");
  89                 cgit_print_docstart(title, item);
  90                 cgit_print_pageheader(title, 0);
  91                 cgit_print_error(fmt("Unable to scan repository: %s",
  92                                      strerror(errno)));
  93                 cgit_print_docend();
  94                 return;
  95         }
  96
  97         title = fmt("%s - %s", cgit_repo->name, cgit_repo->desc);
  98         show_search = 0;
  99         setenv("GIT_DIR", cgit_repo->path, 1);
 100
 101         if (!cgit_query_head) {
 102                 cgit_query_head = xstrdup(find_default_branch(cgit_repo));
 103                 cgit_repo->defbranch = cgit_query_head;
 104         }
 105
 106         if (!cgit_query_head) {
 107                 cgit_print_docstart(title, item);
 108                 cgit_print_pageheader(title, 0);
 109                 cgit_print_error("Repository seems to be empty");
 110                 cgit_print_docend();
 111                 return;
 112         }
 113
 114         if (get_sha1(cgit_query_head, sha1)) {
 115                 tmp = xstrdup(cgit_query_head);
 116                 cgit_query_head = cgit_repo->defbranch;
 117                 cgit_print_docstart(title, item);
 118                 cgit_print_pageheader(title, 0);
 119                 cgit_print_error(fmt("Invalid branch: %s", tmp));
 120                 cgit_print_docend();
 121                 return;
 122         }
 123
 124         if ((cgit_cmd == CMD_SNAPSHOT) && cgit_repo->snapshots) {
 125                 cgit_print_snapshot(item, cgit_query_head, cgit_query_sha1,
 126                                     cgit_repobasename(cgit_repo->url),
 127                                     cgit_query_path,
 128                                     cgit_repo->snapshots );
 129                 return;
 130         }
 131
 132         if (cgit_cmd == CMD_PATCH) {
 133                 cgit_print_patch(cgit_query_sha1, item);
 134                 return;
 135         }
 136
 137         if (cgit_cmd == CMD_BLOB) {
 138                 cgit_print_blob(item, cgit_query_sha1, cgit_query_path);
 139                 return;
 140         }
 141
 142         show_search = (cgit_cmd == CMD_LOG);
 143         cgit_print_docstart(title, item);
 144         if (!cgit_cmd) {
 145                 cgit_print_pageheader("summary", show_search);
 146                 cgit_print_summary();
 147                 cgit_print_docend();
 148                 return;
 149         }
 150
 151         cgit_print_pageheader(cgit_query_page, show_search);
 152
 153         switch(cgit_cmd) {
 154         case CMD_LOG:
 155                 cgit_print_log(cgit_query_sha1, cgit_query_ofs,
 156                                cgit_max_commit_count, cgit_query_grep, cgit_query_search,
 157                                cgit_query_path, 1);
 158                 break;
 159         case CMD_TREE:
 160                 cgit_print_tree(cgit_query_sha1, cgit_query_path);
 161                 break;
 162         case CMD_COMMIT:
 163                 cgit_print_commit(cgit_query_sha1);
 164                 break;
 165         case CMD_REFS:
 166                 cgit_print_refs();
 167                 break;
 168         case CMD_TAG:
 169                 cgit_print_tag(cgit_query_sha1);
 170                 break;
 171         case CMD_DIFF:
 172                 cgit_print_diff(cgit_query_sha1, cgit_query_sha2, cgit_query_path);
 173                 break;
 174         default:
 175                 cgit_print_error("Invalid request");
 176         }
 177         cgit_print_docend();
 178 }
 179
 180 static void cgit_fill_cache(struct cacheitem *item, int use_cache)
 181 {
 182         static char buf[PATH_MAX];
 183         int stdout2;
 184
 185         getcwd(buf, sizeof(buf));
 186         item->st.st_mtime = time(NULL);
 187
 188         if (use_cache) {
 189                 stdout2 = chk_positive(dup(STDOUT_FILENO),
 190                                        "Preserving STDOUT");
 191                 chk_zero(close(STDOUT_FILENO), "Closing STDOUT");
 192                 chk_positive(dup2(item->fd, STDOUT_FILENO), "Dup2(cachefile)");
 193         }
 194
 195         if (cgit_repo)
 196                 cgit_print_repo_page(item);
 197         else
 198                 cgit_print_repolist(item);
 199
 200         if (use_cache) {
 201                 chk_zero(close(STDOUT_FILENO), "Close redirected STDOUT");
 202                 chk_positive(dup2(stdout2, STDOUT_FILENO),
 203                              "Restoring original STDOUT");
 204                 chk_zero(close(stdout2), "Closing temporary STDOUT");
 205         }
 206
 207         chdir(buf);
 208 }
 209
 210 static void cgit_check_cache(struct cacheitem *item)
 211 {
 212         int i = 0;
 213
 214  top:
 215         if (++i > cgit_max_lock_attempts) {
 216                 die("cgit_refresh_cache: unable to lock %s: %s",
 217                     item->name, strerror(errno));
 218         }
 219         if (!cache_exist(item)) {
 220                 if (!cache_lock(item)) {
 221                         sleep(1);
 222                         goto top;
 223                 }
 224                 if (!cache_exist(item)) {
 225                         cgit_fill_cache(item, 1);
 226                         cache_unlock(item);
 227                 } else {
 228                         cache_cancel_lock(item);
 229                 }
 230         } else if (cache_expired(item) && cache_lock(item)) {
 231                 if (cache_expired(item)) {
 232                         cgit_fill_cache(item, 1);
 233                         cache_unlock(item);
 234                 } else {
 235                         cache_cancel_lock(item);
 236                 }
 237         }
 238 }
 239
 240 static void cgit_print_cache(struct cacheitem *item)
 241 {
 242         static char buf[4096];
 243         ssize_t i;
 244
 245         int fd = open(item->name, O_RDONLY);
 246         if (fd<0)
 247                 die("Unable to open cached file %s", item->name);
 248
 249         while((i=read(fd, buf, sizeof(buf))) > 0)
 250                 write(STDOUT_FILENO, buf, i);
 251
 252         close(fd);
 253 }
 254
 255 static void cgit_parse_args(int argc, const char **argv)
 256 {
 257         int i;
 258
 259         for (i = 1; i < argc; i++) {
 260                 if (!strncmp(argv[i], "--cache=", 8)) {
 261                         cgit_cache_root = xstrdup(argv[i]+8);
 262                 }
 263                 if (!strcmp(argv[i], "--nocache")) {
 264                         cgit_nocache = 1;
 265                 }
 266                 if (!strncmp(argv[i], "--query=", 8)) {
 267                         cgit_querystring = xstrdup(argv[i]+8);
 268                 }
 269                 if (!strncmp(argv[i], "--repo=", 7)) {
 270                         cgit_query_repo = xstrdup(argv[i]+7);
 271                 }
 272                 if (!strncmp(argv[i], "--page=", 7)) {
 273                         cgit_query_page = xstrdup(argv[i]+7);
 274                 }
 275                 if (!strncmp(argv[i], "--head=", 7)) {
 276                         cgit_query_head = xstrdup(argv[i]+7);
 277                         cgit_query_has_symref = 1;
 278                 }
 279                 if (!strncmp(argv[i], "--sha1=", 7)) {
 280                         cgit_query_sha1 = xstrdup(argv[i]+7);
 281                         cgit_query_has_sha1 = 1;
 282                 }
 283                 if (!strncmp(argv[i], "--ofs=", 6)) {
 284                         cgit_query_ofs = atoi(argv[i]+6);
 285                 }
 286         }
 287 }
 288
 289 int main(int argc, const char **argv)
 290 {
 291         struct cacheitem item;
 292         const char *cgit_config_env = getenv("CGIT_CONFIG");
 293
 294         htmlfd = STDOUT_FILENO;
 295         item.st.st_mtime = time(NULL);
 296         cgit_repolist.length = 0;
 297         cgit_repolist.count = 0;
 298         cgit_repolist.repos = NULL;
 299
 300         cgit_read_config(cgit_config_env ? cgit_config_env : CGIT_CONFIG,
 301                          cgit_global_config_cb);
 302         cgit_repo = NULL;
 303         if (getenv("SCRIPT_NAME"))
 304                 cgit_script_name = xstrdup(getenv("SCRIPT_NAME"));
 305         if (getenv("QUERY_STRING"))
 306                 cgit_querystring = xstrdup(getenv("QUERY_STRING"));
 307         cgit_parse_args(argc, argv);
 308         cgit_parse_query(cgit_querystring, cgit_querystring_cb);
 309         if (!cgit_prepare_cache(&item))
 310                 return 0;
 311         if (cgit_nocache) {
 312                 cgit_fill_cache(&item, 0);
 313         } else {
 314                 cgit_check_cache(&item);
 315                 cgit_print_cache(&item);
 316         }
 317         return 0;
 318 }