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 static void cgit_print_repo_page(struct cacheitem *item)
  14 {
  15         if (chdir(fmt("%s/%s", cgit_root, cgit_query_repo)) ||
  16             cgit_read_config("info/cgit", cgit_repo_config_cb)) {
  17                 char *title = fmt("%s - %s", cgit_root_title, "Bad request");
  18                 cgit_print_docstart(title, item);
  19                 cgit_print_pageheader(title);
  20                 cgit_print_error(fmt("Unable to scan repository: %s",
  21                                      strerror(errno)));
  22                 cgit_print_docend();
  23                 return;
  24         }
  25         setenv("GIT_DIR", fmt("%s/%s", cgit_root, cgit_query_repo), 1);
  26         char *title = fmt("%s - %s", cgit_repo_name, cgit_repo_desc);
  27         cgit_print_docstart(title, item);
  28         cgit_print_pageheader(title);
  29         if (!cgit_query_page) {
  30                 cgit_print_summary();
  31         } else if (!strcmp(cgit_query_page, "log")) {
  32                 cgit_print_log(cgit_query_head, cgit_query_ofs, 100);
  33         } else if (!strcmp(cgit_query_page, "tree")) {
  34                 cgit_print_tree(cgit_query_sha1);
  35         } else if (!strcmp(cgit_query_page, "view")) {
  36                 cgit_print_view(cgit_query_sha1);
  37         }
  38         cgit_print_docend();
  39 }
  40
  41 static void cgit_fill_cache(struct cacheitem *item)
  42 {
  43         htmlfd = item->fd;
  44         item->st.st_mtime = time(NULL);
  45         if (cgit_query_repo)
  46                 cgit_print_repo_page(item);
  47         else
  48                 cgit_print_repolist(item);
  49 }
  50
  51 static void cgit_check_cache(struct cacheitem *item)
  52 {
  53         int i = 0;
  54
  55         cache_prepare(item);
  56  top:
  57         if (++i > cgit_max_lock_attempts) {
  58                 die("cgit_refresh_cache: unable to lock %s: %s",
  59                     item->name, strerror(errno));
  60         }
  61         if (!cache_exist(item)) {
  62                 if (!cache_lock(item)) {
  63                         sleep(1);
  64                         goto top;
  65                 }
  66                 if (!cache_exist(item)) {
  67                         cgit_fill_cache(item);
  68                         cache_unlock(item);
  69                 } else {
  70                         cache_cancel_lock(item);
  71                 }
  72         } else if (cache_expired(item) && cache_lock(item)) {
  73                 if (cache_expired(item)) {
  74                         cgit_fill_cache(item);
  75                         cache_unlock(item);
  76                 } else {
  77                         cache_cancel_lock(item);
  78                 }
  79         }
  80 }
  81
  82 static void cgit_print_cache(struct cacheitem *item)
  83 {
  84         static char buf[4096];
  85         ssize_t i;
  86
  87         int fd = open(item->name, O_RDONLY);
  88         if (fd<0)
  89                 die("Unable to open cached file %s", item->name);
  90
  91         while((i=read(fd, buf, sizeof(buf))) > 0)
  92                 write(STDOUT_FILENO, buf, i);
  93
  94         close(fd);
  95 }
  96
  97 int main(int argc, const char **argv)
  98 {
  99         struct cacheitem item;
 100
 101         cgit_read_config("/etc/cgitrc", cgit_global_config_cb);
 102         cgit_querystring = xstrdup(getenv("QUERY_STRING"));
 103         cgit_parse_query(cgit_querystring, cgit_querystring_cb);
 104
 105         cgit_check_cache(&item);
 106         cgit_print_cache(&item);
 107         return 0;
 108 }