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 static void cgit_print_repo_page(struct cacheitem *item)
  49 {
  50         char *title;
  51         int show_search;
  52
  53         if (!cgit_query_head)
  54                 cgit_query_head = cgit_repo->defbranch;
  55
  56         if (chdir(cgit_repo->path)) {
  57                 title = fmt("%s - %s", cgit_root_title, "Bad request");
  58                 cgit_print_docstart(title, item);
  59                 cgit_print_pageheader(title, 0);
  60                 cgit_print_error(fmt("Unable to scan repository: %s",
  61                                      strerror(errno)));
  62                 cgit_print_docend();
  63                 return;
  64         }
  65
  66         title = fmt("%s - %s", cgit_repo->name, cgit_repo->desc);
  67         show_search = 0;
  68         setenv("GIT_DIR", cgit_repo->path, 1);
  69
  70         if ((cgit_cmd == CMD_SNAPSHOT) && cgit_repo->snapshots) {
  71                 cgit_print_snapshot(item, cgit_query_head, cgit_query_sha1,
  72                                     cgit_repobasename(cgit_repo->url),
  73                                     cgit_query_path,
  74                                     cgit_repo->snapshots );
  75                 return;
  76         }
  77
  78         if (cgit_cmd == CMD_BLOB) {
  79                 cgit_print_blob(item, cgit_query_sha1, cgit_query_path);
  80                 return;
  81         }
  82
  83         show_search = (cgit_cmd == CMD_LOG);
  84         cgit_print_docstart(title, item);
  85         if (!cgit_cmd) {
  86                 cgit_print_pageheader("summary", show_search);
  87                 cgit_print_summary();
  88                 cgit_print_docend();
  89                 return;
  90         }
  91
  92         cgit_print_pageheader(cgit_query_page, show_search);
  93
  94         switch(cgit_cmd) {
  95         case CMD_LOG:
  96                 cgit_print_log(cgit_query_sha1, cgit_query_ofs,
  97                                cgit_max_commit_count, cgit_query_search,
  98                                cgit_query_path, 1);
  99                 break;
 100         case CMD_TREE:
 101                 cgit_print_tree(cgit_query_sha1, cgit_query_path);
 102                 break;
 103         case CMD_COMMIT:
 104                 cgit_print_commit(cgit_query_sha1);
 105                 break;
 106         case CMD_TAG:
 107                 cgit_print_tag(cgit_query_sha1);
 108                 break;
 109         case CMD_DIFF:
 110                 cgit_print_diff(cgit_query_sha1, cgit_query_sha2, cgit_query_path);
 111                 break;
 112         default:
 113                 cgit_print_error("Invalid request");
 114         }
 115         cgit_print_docend();
 116 }
 117
 118 static void cgit_fill_cache(struct cacheitem *item, int use_cache)
 119 {
 120         static char buf[PATH_MAX];
 121         int stdout2;
 122
 123         getcwd(buf, sizeof(buf));
 124         item->st.st_mtime = time(NULL);
 125
 126         if (use_cache) {
 127                 stdout2 = chk_positive(dup(STDOUT_FILENO),
 128                                        "Preserving STDOUT");
 129                 chk_zero(close(STDOUT_FILENO), "Closing STDOUT");
 130                 chk_positive(dup2(item->fd, STDOUT_FILENO), "Dup2(cachefile)");
 131         }
 132
 133         if (cgit_repo)
 134                 cgit_print_repo_page(item);
 135         else
 136                 cgit_print_repolist(item);
 137
 138         if (use_cache) {
 139                 chk_zero(close(STDOUT_FILENO), "Close redirected STDOUT");
 140                 chk_positive(dup2(stdout2, STDOUT_FILENO),
 141                              "Restoring original STDOUT");
 142                 chk_zero(close(stdout2), "Closing temporary STDOUT");
 143         }
 144
 145         chdir(buf);
 146 }
 147
 148 static void cgit_check_cache(struct cacheitem *item)
 149 {
 150         int i = 0;
 151
 152  top:
 153         if (++i > cgit_max_lock_attempts) {
 154                 die("cgit_refresh_cache: unable to lock %s: %s",
 155                     item->name, strerror(errno));
 156         }
 157         if (!cache_exist(item)) {
 158                 if (!cache_lock(item)) {
 159                         sleep(1);
 160                         goto top;
 161                 }
 162                 if (!cache_exist(item)) {
 163                         cgit_fill_cache(item, 1);
 164                         cache_unlock(item);
 165                 } else {
 166                         cache_cancel_lock(item);
 167                 }
 168         } else if (cache_expired(item) && cache_lock(item)) {
 169                 if (cache_expired(item)) {
 170                         cgit_fill_cache(item, 1);
 171                         cache_unlock(item);
 172                 } else {
 173                         cache_cancel_lock(item);
 174                 }
 175         }
 176 }
 177
 178 static void cgit_print_cache(struct cacheitem *item)
 179 {
 180         static char buf[4096];
 181         ssize_t i;
 182
 183         int fd = open(item->name, O_RDONLY);
 184         if (fd<0)
 185                 die("Unable to open cached file %s", item->name);
 186
 187         while((i=read(fd, buf, sizeof(buf))) > 0)
 188                 write(STDOUT_FILENO, buf, i);
 189
 190         close(fd);
 191 }
 192
 193 static void cgit_parse_args(int argc, const char **argv)
 194 {
 195         int i;
 196
 197         for (i = 1; i < argc; i++) {
 198                 if (!strncmp(argv[i], "--cache=", 8)) {
 199                         cgit_cache_root = xstrdup(argv[i]+8);
 200                 }
 201                 if (!strcmp(argv[i], "--nocache")) {
 202                         cgit_nocache = 1;
 203                 }
 204                 if (!strncmp(argv[i], "--query=", 8)) {
 205                         cgit_querystring = xstrdup(argv[i]+8);
 206                 }
 207                 if (!strncmp(argv[i], "--repo=", 7)) {
 208                         cgit_query_repo = xstrdup(argv[i]+7);
 209                 }
 210                 if (!strncmp(argv[i], "--page=", 7)) {
 211                         cgit_query_page = xstrdup(argv[i]+7);
 212                 }
 213                 if (!strncmp(argv[i], "--head=", 7)) {
 214                         cgit_query_head = xstrdup(argv[i]+7);
 215                         cgit_query_has_symref = 1;
 216                 }
 217                 if (!strncmp(argv[i], "--sha1=", 7)) {
 218                         cgit_query_sha1 = xstrdup(argv[i]+7);
 219                         cgit_query_has_sha1 = 1;
 220                 }
 221                 if (!strncmp(argv[i], "--ofs=", 6)) {
 222                         cgit_query_ofs = atoi(argv[i]+6);
 223                 }
 224         }
 225 }
 226
 227 int main(int argc, const char **argv)
 228 {
 229         struct cacheitem item;
 230         const char *cgit_config_env = getenv("CGIT_CONFIG");
 231
 232         htmlfd = STDOUT_FILENO;
 233         item.st.st_mtime = time(NULL);
 234         cgit_repolist.length = 0;
 235         cgit_repolist.count = 0;
 236         cgit_repolist.repos = NULL;
 237
 238         cgit_read_config(cgit_config_env ? cgit_config_env : CGIT_CONFIG,
 239                          cgit_global_config_cb);
 240         cgit_repo = NULL;
 241         if (getenv("SCRIPT_NAME"))
 242                 cgit_script_name = xstrdup(getenv("SCRIPT_NAME"));
 243         if (getenv("QUERY_STRING"))
 244                 cgit_querystring = xstrdup(getenv("QUERY_STRING"));
 245         cgit_parse_args(argc, argv);
 246         cgit_parse_query(cgit_querystring, cgit_querystring_cb);
 247         if (!cgit_prepare_cache(&item))
 248                 return 0;
 249         if (cgit_nocache) {
 250                 cgit_fill_cache(&item, 0);
 251         } else {
 252                 cgit_check_cache(&item);
 253                 cgit_print_cache(&item);
 254         }
 255         return 0;
 256 }