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.html", cgit_cache_root,
  30                            cache_safe_filename(cgit_repo->url)));
  31                 item->ttl = cgit_cache_repo_ttl;
  32         } else {
  33                 item->name = xstrdup(fmt("%s/%s/%s/%s.html", cgit_cache_root,
  34                            cache_safe_filename(cgit_repo->url), cgit_query_page,
  35                            cache_safe_filename(cgit_querystring)));
  36                 if (cgit_query_has_symref)
  37                         item->ttl = cgit_cache_dynamic_ttl;
  38                 else if (cgit_query_has_sha1)
  39                         item->ttl = cgit_cache_static_ttl;
  40                 else
  41                         item->ttl = cgit_cache_repo_ttl;
  42         }
  43         return 1;
  44 }
  45
  46 static void cgit_print_repo_page(struct cacheitem *item)
  47 {
  48         char *title;
  49         int show_search;
  50
  51         if (!cgit_query_head)
  52                 cgit_query_head = cgit_repo->defbranch;
  53
  54         if (chdir(cgit_repo->path)) {
  55                 title = fmt("%s - %s", cgit_root_title, "Bad request");
  56                 cgit_print_docstart(title, item);
  57                 cgit_print_pageheader(title, 0);
  58                 cgit_print_error(fmt("Unable to scan repository: %s",
  59                                      strerror(errno)));
  60                 cgit_print_docend();
  61                 return;
  62         }
  63
  64         title = fmt("%s - %s", cgit_repo->name, cgit_repo->desc);
  65         show_search = 0;
  66         setenv("GIT_DIR", cgit_repo->path, 1);
  67
  68         if ((cgit_cmd == CMD_SNAPSHOT) && cgit_repo->snapshots) {
  69                 cgit_print_snapshot(item, cgit_query_sha1, "zip",
  70                                     cgit_repo->url, cgit_query_name);
  71                 return;
  72         }
  73
  74         if (cgit_cmd == CMD_BLOB) {
  75                 cgit_print_blob(item, cgit_query_sha1, cgit_query_path);
  76                 return;
  77         }
  78
  79         show_search = (cgit_cmd == CMD_LOG);
  80         cgit_print_docstart(title, item);
  81         if (!cgit_cmd) {
  82                 cgit_print_pageheader("summary", show_search);
  83                 cgit_print_summary();
  84                 cgit_print_docend();
  85                 return;
  86         }
  87
  88         cgit_print_pageheader(cgit_query_page, show_search);
  89
  90         switch(cgit_cmd) {
  91         case CMD_LOG:
  92                 cgit_print_log(cgit_query_sha1, cgit_query_ofs,
  93                                cgit_max_commit_count, cgit_query_search,
  94                                cgit_query_path, 1);
  95                 break;
  96         case CMD_TREE:
  97                 cgit_print_tree(cgit_query_sha1, cgit_query_path);
  98                 break;
  99         case CMD_COMMIT:
 100                 cgit_print_commit(cgit_query_sha1);
 101                 break;
 102         case CMD_DIFF:
 103                 cgit_print_diff(cgit_query_sha1, cgit_query_sha2);
 104                 break;
 105         default:
 106                 cgit_print_error("Invalid request");
 107         }
 108         cgit_print_docend();
 109 }
 110
 111 static void cgit_fill_cache(struct cacheitem *item, int use_cache)
 112 {
 113         static char buf[PATH_MAX];
 114         int stdout2;
 115
 116         getcwd(buf, sizeof(buf));
 117         item->st.st_mtime = time(NULL);
 118
 119         if (use_cache) {
 120                 stdout2 = chk_positive(dup(STDOUT_FILENO),
 121                                        "Preserving STDOUT");
 122                 chk_zero(close(STDOUT_FILENO), "Closing STDOUT");
 123                 chk_positive(dup2(item->fd, STDOUT_FILENO), "Dup2(cachefile)");
 124         }
 125
 126         if (cgit_repo)
 127                 cgit_print_repo_page(item);
 128         else
 129                 cgit_print_repolist(item);
 130
 131         if (use_cache) {
 132                 chk_zero(close(STDOUT_FILENO), "Close redirected STDOUT");
 133                 chk_positive(dup2(stdout2, STDOUT_FILENO),
 134                              "Restoring original STDOUT");
 135                 chk_zero(close(stdout2), "Closing temporary STDOUT");
 136         }
 137
 138         chdir(buf);
 139 }
 140
 141 static void cgit_check_cache(struct cacheitem *item)
 142 {
 143         int i = 0;
 144
 145  top:
 146         if (++i > cgit_max_lock_attempts) {
 147                 die("cgit_refresh_cache: unable to lock %s: %s",
 148                     item->name, strerror(errno));
 149         }
 150         if (!cache_exist(item)) {
 151                 if (!cache_lock(item)) {
 152                         sleep(1);
 153                         goto top;
 154                 }
 155                 if (!cache_exist(item)) {
 156                         cgit_fill_cache(item, 1);
 157                         cache_unlock(item);
 158                 } else {
 159                         cache_cancel_lock(item);
 160                 }
 161         } else if (cache_expired(item) && cache_lock(item)) {
 162                 if (cache_expired(item)) {
 163                         cgit_fill_cache(item, 1);
 164                         cache_unlock(item);
 165                 } else {
 166                         cache_cancel_lock(item);
 167                 }
 168         }
 169 }
 170
 171 static void cgit_print_cache(struct cacheitem *item)
 172 {
 173         static char buf[4096];
 174         ssize_t i;
 175
 176         int fd = open(item->name, O_RDONLY);
 177         if (fd<0)
 178                 die("Unable to open cached file %s", item->name);
 179
 180         while((i=read(fd, buf, sizeof(buf))) > 0)
 181                 write(STDOUT_FILENO, buf, i);
 182
 183         close(fd);
 184 }
 185
 186 static void cgit_parse_args(int argc, const char **argv)
 187 {
 188         int i;
 189
 190         for (i = 1; i < argc; i++) {
 191                 if (!strncmp(argv[i], "--cache=", 8)) {
 192                         cgit_cache_root = xstrdup(argv[i]+8);
 193                 }
 194                 if (!strcmp(argv[i], "--nocache")) {
 195                         cgit_nocache = 1;
 196                 }
 197                 if (!strncmp(argv[i], "--query=", 8)) {
 198                         cgit_querystring = xstrdup(argv[i]+8);
 199                 }
 200                 if (!strncmp(argv[i], "--repo=", 7)) {
 201                         cgit_query_repo = xstrdup(argv[i]+7);
 202                 }
 203                 if (!strncmp(argv[i], "--page=", 7)) {
 204                         cgit_query_page = xstrdup(argv[i]+7);
 205                 }
 206                 if (!strncmp(argv[i], "--head=", 7)) {
 207                         cgit_query_head = xstrdup(argv[i]+7);
 208                         cgit_query_has_symref = 1;
 209                 }
 210                 if (!strncmp(argv[i], "--sha1=", 7)) {
 211                         cgit_query_sha1 = xstrdup(argv[i]+7);
 212                         cgit_query_has_sha1 = 1;
 213                 }
 214                 if (!strncmp(argv[i], "--ofs=", 6)) {
 215                         cgit_query_ofs = atoi(argv[i]+6);
 216                 }
 217         }
 218 }
 219
 220 int main(int argc, const char **argv)
 221 {
 222         struct cacheitem item;
 223
 224         htmlfd = STDOUT_FILENO;
 225         item.st.st_mtime = time(NULL);
 226         cgit_repolist.length = 0;
 227         cgit_repolist.count = 0;
 228         cgit_repolist.repos = NULL;
 229
 230         cgit_read_config(CGIT_CONFIG, cgit_global_config_cb);
 231         cgit_repo = NULL;
 232         if (getenv("SCRIPT_NAME"))
 233                 cgit_script_name = xstrdup(getenv("SCRIPT_NAME"));
 234         if (getenv("QUERY_STRING"))
 235                 cgit_querystring = xstrdup(getenv("QUERY_STRING"));
 236         cgit_parse_args(argc, argv);
 237         cgit_parse_query(cgit_querystring, cgit_querystring_cb);
 238         if (!cgit_prepare_cache(&item))
 239                 return 0;
 240         if (cgit_nocache) {
 241                 cgit_fill_cache(&item, 0);
 242         } else {
 243                 cgit_check_cache(&item);
 244                 cgit_print_cache(&item);
 245         }
 246         return 0;
 247 }