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