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_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_PATCH) {
  79                 cgit_print_patch(cgit_query_sha1, item);
  80                 return;
  81         }
  82
  83         if (cgit_cmd == CMD_BLOB) {
  84                 cgit_print_blob(item, cgit_query_sha1, cgit_query_path);
  85                 return;
  86         }
  87
  88         show_search = (cgit_cmd == CMD_LOG);
  89         cgit_print_docstart(title, item);
  90         if (!cgit_cmd) {
  91                 cgit_print_pageheader("summary", show_search);
  92                 cgit_print_summary();
  93                 cgit_print_docend();
  94                 return;
  95         }
  96
  97         cgit_print_pageheader(cgit_query_page, show_search);
  98
  99         switch(cgit_cmd) {
 100         case CMD_LOG:
 101                 cgit_print_log(cgit_query_sha1, cgit_query_ofs,
 102                                cgit_max_commit_count, cgit_query_grep, cgit_query_search,
 103                                cgit_query_path, 1);
 104                 break;
 105         case CMD_TREE:
 106                 cgit_print_tree(cgit_query_sha1, cgit_query_path);
 107                 break;
 108         case CMD_COMMIT:
 109                 cgit_print_commit(cgit_query_sha1);
 110                 break;
 111         case CMD_REFS:
 112                 cgit_print_refs();
 113                 break;
 114         case CMD_TAG:
 115                 cgit_print_tag(cgit_query_sha1);
 116                 break;
 117         case CMD_DIFF:
 118                 cgit_print_diff(cgit_query_sha1, cgit_query_sha2, cgit_query_path);
 119                 break;
 120         default:
 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_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         const char *cgit_config_env = getenv("CGIT_CONFIG");
 239
 240         htmlfd = STDOUT_FILENO;
 241         item.st.st_mtime = time(NULL);
 242         cgit_repolist.length = 0;
 243         cgit_repolist.count = 0;
 244         cgit_repolist.repos = NULL;
 245
 246         cgit_read_config(cgit_config_env ? cgit_config_env : CGIT_CONFIG,
 247                          cgit_global_config_cb);
 248         cgit_repo = NULL;
 249         if (getenv("SCRIPT_NAME"))
 250                 cgit_script_name = xstrdup(getenv("SCRIPT_NAME"));
 251         if (getenv("QUERY_STRING"))
 252                 cgit_querystring = xstrdup(getenv("QUERY_STRING"));
 253         cgit_parse_args(argc, argv);
 254         cgit_parse_query(cgit_querystring, cgit_querystring_cb);
 255         if (!cgit_prepare_cache(&item))
 256                 return 0;
 257         if (cgit_nocache) {
 258                 cgit_fill_cache(&item, 0);
 259         } else {
 260                 cgit_check_cache(&item);
 261                 cgit_print_cache(&item);
 262         }
 263         return 0;
 264 }