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
  14 static struct repoinfo *cgit_get_repoinfo(char *url)
  15 {
  16         int i;
  17         struct repoinfo *repo;
  18
  19         for (i=0; i<cgit_repolist.count; i++) {
  20                 repo = &cgit_repolist.repos[i];
  21                 if (!strcmp(repo->url, url))
  22                         return repo;
  23         }
  24         return NULL;
  25 }
  26
  27
  28 static int cgit_prepare_cache(struct cacheitem *item)
  29 {
  30         if (!cgit_query_repo) {
  31                 item->name = xstrdup(fmt("%s/index.html", cgit_cache_root));
  32                 item->ttl = cgit_cache_root_ttl;
  33                 return 1;
  34         }
  35         cgit_repo = cgit_get_repoinfo(cgit_query_repo);
  36         if (!cgit_repo) {
  37                 char *title = fmt("%s - %s", cgit_root_title, "Bad request");
  38                 cgit_print_docstart(title, item);
  39                 cgit_print_pageheader(title, 0);
  40                 cgit_print_error(fmt("Unknown repo: %s", cgit_query_repo));
  41                 cgit_print_docend();
  42                 return 0;
  43         }
  44
  45         if (!cgit_query_page) {
  46                 item->name = xstrdup(fmt("%s/%s/index.html", cgit_cache_root,
  47                            cgit_repo->url));
  48                 item->ttl = cgit_cache_repo_ttl;
  49         } else {
  50                 item->name = xstrdup(fmt("%s/%s/%s/%s.html", cgit_cache_root,
  51                            cgit_repo->url, cgit_query_page,
  52                            cache_safe_filename(cgit_querystring)));
  53                 if (cgit_query_has_symref)
  54                         item->ttl = cgit_cache_dynamic_ttl;
  55                 else if (cgit_query_has_sha1)
  56                         item->ttl = cgit_cache_static_ttl;
  57                 else
  58                         item->ttl = cgit_cache_repo_ttl;
  59         }
  60         return 1;
  61 }
  62
  63 static void cgit_print_repo_page(struct cacheitem *item)
  64 {
  65         char *title;
  66         int show_search;
  67
  68         if (chdir(cgit_repo->path)) {
  69                 title = fmt("%s - %s", cgit_root_title, "Bad request");
  70                 cgit_print_docstart(title, item);
  71                 cgit_print_pageheader(title, 0);
  72                 cgit_print_error(fmt("Unable to scan repository: %s",
  73                                      strerror(errno)));
  74                 cgit_print_docend();
  75                 return;
  76         }
  77
  78         title = fmt("%s - %s", cgit_repo->name, cgit_repo->desc);
  79         show_search = 0;
  80         setenv("GIT_DIR", cgit_repo->path, 1);
  81
  82         if (cgit_query_page) {
  83             if (cgit_repo->snapshots && !strcmp(cgit_query_page, "snapshot")) {
  84                 cgit_print_snapshot(item, cgit_query_sha1, "zip",
  85                                     cgit_repo->url, cgit_query_name);
  86                 return;
  87             }
  88             if (!strcmp(cgit_query_page, "blob")) {
  89                     cgit_print_blob(item, cgit_query_sha1, cgit_query_path);
  90                     return;
  91             }
  92         }
  93
  94         if (cgit_query_page && !strcmp(cgit_query_page, "log"))
  95                 show_search = 1;
  96
  97         cgit_print_docstart(title, item);
  98
  99
 100         if (!cgit_query_page) {
 101                 cgit_print_pageheader("summary", show_search);
 102                 cgit_print_summary();
 103                 cgit_print_docend();
 104                 return;
 105         }
 106
 107         cgit_print_pageheader(cgit_query_page, show_search);
 108
 109         if (!strcmp(cgit_query_page, "log")) {
 110                 cgit_print_log(cgit_query_head, cgit_query_ofs, 100,
 111                                cgit_query_search);
 112         } else if (!strcmp(cgit_query_page, "tree")) {
 113                 cgit_print_tree(cgit_query_sha1, cgit_query_path);
 114         } else if (!strcmp(cgit_query_page, "commit")) {
 115                 cgit_print_commit(cgit_query_sha1);
 116         } else if (!strcmp(cgit_query_page, "view")) {
 117                 cgit_print_view(cgit_query_sha1, cgit_query_path);
 118         } else if (!strcmp(cgit_query_page, "diff")) {
 119                 cgit_print_diff(cgit_query_sha1, cgit_query_sha2);
 120         } else {
 121                 cgit_print_error("Invalid request");
 122         }
 123         cgit_print_docend();
 124 }
 125
 126 static void cgit_fill_cache(struct cacheitem *item, int use_cache)
 127 {
 128         static char buf[PATH_MAX];
 129         int stdout2;
 130
 131         getcwd(buf, sizeof(buf));
 132         item->st.st_mtime = time(NULL);
 133
 134         if (use_cache) {
 135                 stdout2 = chk_positive(dup(STDOUT_FILENO),
 136                                        "Preserving STDOUT");
 137                 chk_zero(close(STDOUT_FILENO), "Closing STDOUT");
 138                 chk_positive(dup2(item->fd, STDOUT_FILENO), "Dup2(cachefile)");
 139         }
 140
 141         if (cgit_query_repo)
 142                 cgit_print_repo_page(item);
 143         else
 144                 cgit_print_repolist(item);
 145
 146         if (use_cache) {
 147                 chk_zero(close(STDOUT_FILENO), "Close redirected STDOUT");
 148                 chk_positive(dup2(stdout2, STDOUT_FILENO),
 149                              "Restoring original STDOUT");
 150                 chk_zero(close(stdout2), "Closing temporary STDOUT");
 151         }
 152
 153         chdir(buf);
 154 }
 155
 156 static void cgit_check_cache(struct cacheitem *item)
 157 {
 158         int i = 0;
 159
 160  top:
 161         if (++i > cgit_max_lock_attempts) {
 162                 die("cgit_refresh_cache: unable to lock %s: %s",
 163                     item->name, strerror(errno));
 164         }
 165         if (!cache_exist(item)) {
 166                 if (!cache_lock(item)) {
 167                         sleep(1);
 168                         goto top;
 169                 }
 170                 if (!cache_exist(item)) {
 171                         cgit_fill_cache(item, 1);
 172                         cache_unlock(item);
 173                 } else {
 174                         cache_cancel_lock(item);
 175                 }
 176         } else if (cache_expired(item) && cache_lock(item)) {
 177                 if (cache_expired(item)) {
 178                         cgit_fill_cache(item, 1);
 179                         cache_unlock(item);
 180                 } else {
 181                         cache_cancel_lock(item);
 182                 }
 183         }
 184 }
 185
 186 static void cgit_print_cache(struct cacheitem *item)
 187 {
 188         static char buf[4096];
 189         ssize_t i;
 190
 191         int fd = open(item->name, O_RDONLY);
 192         if (fd<0)
 193                 die("Unable to open cached file %s", item->name);
 194
 195         while((i=read(fd, buf, sizeof(buf))) > 0)
 196                 write(STDOUT_FILENO, buf, i);
 197
 198         close(fd);
 199 }
 200
 201 static void cgit_parse_args(int argc, const char **argv)
 202 {
 203         int i;
 204
 205         for (i = 1; i < argc; i++) {
 206                 if (!strncmp(argv[i], "--cache=", 8)) {
 207                         cgit_cache_root = xstrdup(argv[i]+8);
 208                 }
 209                 if (!strcmp(argv[i], "--nocache")) {
 210                         cgit_nocache = 1;
 211                 }
 212                 if (!strncmp(argv[i], "--query=", 8)) {
 213                         cgit_querystring = xstrdup(argv[i]+8);
 214                 }
 215                 if (!strncmp(argv[i], "--repo=", 7)) {
 216                         cgit_query_repo = xstrdup(argv[i]+7);
 217                 }
 218                 if (!strncmp(argv[i], "--page=", 7)) {
 219                         cgit_query_page = xstrdup(argv[i]+7);
 220                 }
 221                 if (!strncmp(argv[i], "--head=", 7)) {
 222                         cgit_query_head = xstrdup(argv[i]+7);
 223                         cgit_query_has_symref = 1;
 224                 }
 225                 if (!strncmp(argv[i], "--sha1=", 7)) {
 226                         cgit_query_sha1 = xstrdup(argv[i]+7);
 227                         cgit_query_has_sha1 = 1;
 228                 }
 229                 if (!strncmp(argv[i], "--ofs=", 6)) {
 230                         cgit_query_ofs = atoi(argv[i]+6);
 231                 }
 232         }
 233 }
 234
 235 int main(int argc, const char **argv)
 236 {
 237         struct cacheitem item;
 238
 239         htmlfd = STDOUT_FILENO;
 240         item.st.st_mtime = time(NULL);
 241         cgit_repolist.length = 0;
 242         cgit_repolist.count = 0;
 243         cgit_repolist.repos = NULL;
 244
 245         cgit_read_config("/etc/cgitrc", cgit_global_config_cb);
 246         if (getenv("QUERY_STRING"))
 247                 cgit_querystring = xstrdup(getenv("QUERY_STRING"));
 248         cgit_parse_args(argc, argv);
 249         cgit_parse_query(cgit_querystring, cgit_querystring_cb);
 250         if (!cgit_prepare_cache(&item))
 251                 return 0;
 252         if (cgit_nocache) {
 253                 cgit_fill_cache(&item, 0);
 254         } else {
 255                 cgit_check_cache(&item);
 256                 cgit_print_cache(&item);
 257         }
 258         return 0;
 259 }