gitweb.ps.run Git - ps-cgit/blob - 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_sha1,
  72                                     cgit_repobasename(cgit_repo->url),
  73                                     cgit_query_name);
  74                 return;
  75         }
  76
  77         if (cgit_cmd == CMD_BLOB) {
  78                 cgit_print_blob(item, cgit_query_sha1, cgit_query_path);
  79                 return;
  80         }
  81
  82         show_search = (cgit_cmd == CMD_LOG);
  83         cgit_print_docstart(title, item);
  84         if (!cgit_cmd) {
  85                 cgit_print_pageheader("summary", show_search);
  86                 cgit_print_summary();
  87                 cgit_print_docend();
  88                 return;
  89         }
  90
  91         cgit_print_pageheader(cgit_query_page, show_search);
  92
  93         switch(cgit_cmd) {
  94         case CMD_LOG:
  95                 cgit_print_log(cgit_query_sha1, cgit_query_ofs,
  96                                cgit_max_commit_count, cgit_query_search,
  97                                cgit_query_path, 1);
  98                 break;
  99         case CMD_TREE:
 100                 cgit_print_tree(cgit_query_sha1, cgit_query_path);
 101                 break;
 102         case CMD_COMMIT:
 103                 cgit_print_commit(cgit_query_sha1);
 104                 break;
 105         case CMD_DIFF:
 106                 cgit_print_diff(cgit_query_sha1, cgit_query_sha2);
 107                 break;
 108         default:
 109                 cgit_print_error("Invalid request");
 110         }
 111         cgit_print_docend();
 112 }
 113
 114 static void cgit_fill_cache(struct cacheitem *item, int use_cache)
 115 {
 116         static char buf[PATH_MAX];
 117         int stdout2;
 118
 119         getcwd(buf, sizeof(buf));
 120         item->st.st_mtime = time(NULL);
 121
 122         if (use_cache) {
 123                 stdout2 = chk_positive(dup(STDOUT_FILENO),
 124                                        "Preserving STDOUT");
 125                 chk_zero(close(STDOUT_FILENO), "Closing STDOUT");
 126                 chk_positive(dup2(item->fd, STDOUT_FILENO), "Dup2(cachefile)");
 127         }
 128
 129         if (cgit_repo)
 130                 cgit_print_repo_page(item);
 131         else
 132                 cgit_print_repolist(item);
 133
 134         if (use_cache) {
 135                 chk_zero(close(STDOUT_FILENO), "Close redirected STDOUT");
 136                 chk_positive(dup2(stdout2, STDOUT_FILENO),
 137                              "Restoring original STDOUT");
 138                 chk_zero(close(stdout2), "Closing temporary STDOUT");
 139         }
 140
 141         chdir(buf);
 142 }
 143
 144 static void cgit_check_cache(struct cacheitem *item)
 145 {
 146         int i = 0;
 147
 148  top:
 149         if (++i > cgit_max_lock_attempts) {
 150                 die("cgit_refresh_cache: unable to lock %s: %s",
 151                     item->name, strerror(errno));
 152         }
 153         if (!cache_exist(item)) {
 154                 if (!cache_lock(item)) {
 155                         sleep(1);
 156                         goto top;
 157                 }
 158                 if (!cache_exist(item)) {
 159                         cgit_fill_cache(item, 1);
 160                         cache_unlock(item);
 161                 } else {
 162                         cache_cancel_lock(item);
 163                 }
 164         } else if (cache_expired(item) && cache_lock(item)) {
 165                 if (cache_expired(item)) {
 166                         cgit_fill_cache(item, 1);
 167                         cache_unlock(item);
 168                 } else {
 169                         cache_cancel_lock(item);
 170                 }
 171         }
 172 }
 173
 174 static void cgit_print_cache(struct cacheitem *item)
 175 {
 176         static char buf[4096];
 177         ssize_t i;
 178
 179         int fd = open(item->name, O_RDONLY);
 180         if (fd<0)
 181                 die("Unable to open cached file %s", item->name);
 182
 183         while((i=read(fd, buf, sizeof(buf))) > 0)
 184                 write(STDOUT_FILENO, buf, i);
 185
 186         close(fd);
 187 }
 188
 189 static void cgit_parse_args(int argc, const char **argv)
 190 {
 191         int i;
 192
 193         for (i = 1; i < argc; i++) {
 194                 if (!strncmp(argv[i], "--cache=", 8)) {
 195                         cgit_cache_root = xstrdup(argv[i]+8);
 196                 }
 197                 if (!strcmp(argv[i], "--nocache")) {
 198                         cgit_nocache = 1;
 199                 }
 200                 if (!strncmp(argv[i], "--query=", 8)) {
 201                         cgit_querystring = xstrdup(argv[i]+8);
 202                 }
 203                 if (!strncmp(argv[i], "--repo=", 7)) {
 204                         cgit_query_repo = xstrdup(argv[i]+7);
 205                 }
 206                 if (!strncmp(argv[i], "--page=", 7)) {
 207                         cgit_query_page = xstrdup(argv[i]+7);
 208                 }
 209                 if (!strncmp(argv[i], "--head=", 7)) {
 210                         cgit_query_head = xstrdup(argv[i]+7);
 211                         cgit_query_has_symref = 1;
 212                 }
 213                 if (!strncmp(argv[i], "--sha1=", 7)) {
 214                         cgit_query_sha1 = xstrdup(argv[i]+7);
 215                         cgit_query_has_sha1 = 1;
 216                 }
 217                 if (!strncmp(argv[i], "--ofs=", 6)) {
 218                         cgit_query_ofs = atoi(argv[i]+6);
 219                 }
 220         }
 221 }
 222
 223 int main(int argc, const char **argv)
 224 {
 225         struct cacheitem item;
 226         const char *cgit_config_env = getenv("CGIT_CONFIG");
 227
 228         htmlfd = STDOUT_FILENO;
 229         item.st.st_mtime = time(NULL);
 230         cgit_repolist.length = 0;
 231         cgit_repolist.count = 0;
 232         cgit_repolist.repos = NULL;
 233
 234         cgit_read_config(cgit_config_env ? cgit_config_env : CGIT_CONFIG,
 235                          cgit_global_config_cb);
 236         cgit_repo = NULL;
 237         if (getenv("SCRIPT_NAME"))
 238                 cgit_script_name = xstrdup(getenv("SCRIPT_NAME"));
 239         if (getenv("QUERY_STRING"))
 240                 cgit_querystring = xstrdup(getenv("QUERY_STRING"));
 241         cgit_parse_args(argc, argv);
 242         cgit_parse_query(cgit_querystring, cgit_querystring_cb);
 243         if (!cgit_prepare_cache(&item))
 244                 return 0;
 245         if (cgit_nocache) {
 246                 cgit_fill_cache(&item, 0);
 247         } else {
 248                 cgit_check_cache(&item);
 249                 cgit_print_cache(&item);
 250         }
 251         return 0;
 252 }