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_repo->snapshots && cgit_query_page &&
  83             !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
  89         if (cgit_query_page && !strcmp(cgit_query_page, "log"))
  90                 show_search = 1;
  91
  92         cgit_print_docstart(title, item);
  93
  94
  95         if (!cgit_query_page) {
  96                 cgit_print_pageheader("summary", show_search);
  97                 cgit_print_summary();
  98                 cgit_print_docend();
  99                 return;
 100         }
 101
 102         cgit_print_pageheader(cgit_query_page, show_search);
 103
 104         if (!strcmp(cgit_query_page, "log")) {
 105                 cgit_print_log(cgit_query_head, cgit_query_ofs, 100,
 106                                cgit_query_search);
 107         } else if (!strcmp(cgit_query_page, "tree")) {
 108                 cgit_print_tree(cgit_query_sha1, cgit_query_path);
 109         } else if (!strcmp(cgit_query_page, "commit")) {
 110                 cgit_print_commit(cgit_query_sha1);
 111         } else if (!strcmp(cgit_query_page, "view")) {
 112                 cgit_print_view(cgit_query_sha1);
 113         } else if (!strcmp(cgit_query_page, "diff")) {
 114                 cgit_print_diff(cgit_query_sha1, cgit_query_sha2);
 115         } else {
 116                 cgit_print_error("Invalid request");
 117         }
 118         cgit_print_docend();
 119 }
 120
 121 static void cgit_fill_cache(struct cacheitem *item, int use_cache)
 122 {
 123         static char buf[PATH_MAX];
 124         int stdout2;
 125
 126         getcwd(buf, sizeof(buf));
 127         item->st.st_mtime = time(NULL);
 128
 129         if (use_cache) {
 130                 stdout2 = chk_positive(dup(STDOUT_FILENO),
 131                                        "Preserving STDOUT");
 132                 chk_zero(close(STDOUT_FILENO), "Closing STDOUT");
 133                 chk_positive(dup2(item->fd, STDOUT_FILENO), "Dup2(cachefile)");
 134         }
 135
 136         if (cgit_query_repo)
 137                 cgit_print_repo_page(item);
 138         else
 139                 cgit_print_repolist(item);
 140
 141         if (use_cache) {
 142                 chk_zero(close(STDOUT_FILENO), "Close redirected STDOUT");
 143                 chk_positive(dup2(stdout2, STDOUT_FILENO),
 144                              "Restoring original STDOUT");
 145                 chk_zero(close(stdout2), "Closing temporary STDOUT");
 146         }
 147
 148         chdir(buf);
 149 }
 150
 151 static void cgit_check_cache(struct cacheitem *item)
 152 {
 153         int i = 0;
 154
 155  top:
 156         if (++i > cgit_max_lock_attempts) {
 157                 die("cgit_refresh_cache: unable to lock %s: %s",
 158                     item->name, strerror(errno));
 159         }
 160         if (!cache_exist(item)) {
 161                 if (!cache_lock(item)) {
 162                         sleep(1);
 163                         goto top;
 164                 }
 165                 if (!cache_exist(item)) {
 166                         cgit_fill_cache(item, 1);
 167                         cache_unlock(item);
 168                 } else {
 169                         cache_cancel_lock(item);
 170                 }
 171         } else if (cache_expired(item) && cache_lock(item)) {
 172                 if (cache_expired(item)) {
 173                         cgit_fill_cache(item, 1);
 174                         cache_unlock(item);
 175                 } else {
 176                         cache_cancel_lock(item);
 177                 }
 178         }
 179 }
 180
 181 static void cgit_print_cache(struct cacheitem *item)
 182 {
 183         static char buf[4096];
 184         ssize_t i;
 185
 186         int fd = open(item->name, O_RDONLY);
 187         if (fd<0)
 188                 die("Unable to open cached file %s", item->name);
 189
 190         while((i=read(fd, buf, sizeof(buf))) > 0)
 191                 write(STDOUT_FILENO, buf, i);
 192
 193         close(fd);
 194 }
 195
 196 static void cgit_parse_args(int argc, const char **argv)
 197 {
 198         int i;
 199
 200         for (i = 1; i < argc; i++) {
 201                 if (!strncmp(argv[i], "--cache=", 8)) {
 202                         cgit_cache_root = xstrdup(argv[i]+8);
 203                 }
 204                 if (!strcmp(argv[i], "--nocache")) {
 205                         cgit_nocache = 1;
 206                 }
 207                 if (!strncmp(argv[i], "--query=", 8)) {
 208                         cgit_querystring = xstrdup(argv[i]+8);
 209                 }
 210                 if (!strncmp(argv[i], "--repo=", 7)) {
 211                         cgit_query_repo = xstrdup(argv[i]+7);
 212                 }
 213                 if (!strncmp(argv[i], "--page=", 7)) {
 214                         cgit_query_page = xstrdup(argv[i]+7);
 215                 }
 216                 if (!strncmp(argv[i], "--head=", 7)) {
 217                         cgit_query_head = xstrdup(argv[i]+7);
 218                         cgit_query_has_symref = 1;
 219                 }
 220                 if (!strncmp(argv[i], "--sha1=", 7)) {
 221                         cgit_query_sha1 = xstrdup(argv[i]+7);
 222                         cgit_query_has_sha1 = 1;
 223                 }
 224                 if (!strncmp(argv[i], "--ofs=", 6)) {
 225                         cgit_query_ofs = atoi(argv[i]+6);
 226                 }
 227         }
 228 }
 229
 230 int main(int argc, const char **argv)
 231 {
 232         struct cacheitem item;
 233
 234         htmlfd = STDOUT_FILENO;
 235         item.st.st_mtime = time(NULL);
 236         cgit_repolist.length = 0;
 237         cgit_repolist.count = 0;
 238         cgit_repolist.repos = NULL;
 239
 240         cgit_read_config("/etc/cgitrc", cgit_global_config_cb);
 241         if (getenv("QUERY_STRING"))
 242                 cgit_querystring = xstrdup(getenv("QUERY_STRING"));
 243         cgit_parse_args(argc, argv);
 244         cgit_parse_query(cgit_querystring, cgit_querystring_cb);
 245         if (!cgit_prepare_cache(&item))
 246                 return 0;
 247         if (cgit_nocache) {
 248                 cgit_fill_cache(&item, 0);
 249         } else {
 250                 cgit_check_cache(&item);
 251                 cgit_print_cache(&item);
 252         }
 253         return 0;
 254 }