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