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 int htmlfd = 0;
  14
  15 char *cgit_root         = "/usr/src/git";
  16 char *cgit_root_title   = "Git repository browser";
  17 char *cgit_css          = "/cgit.css";
  18 char *cgit_logo         = "/git-logo.png";
  19 char *cgit_logo_link    = "http://www.kernel.org/pub/software/scm/git/docs/";
  20 char *cgit_virtual_root = NULL;
  21
  22 char *cgit_cache_root   = "/var/cache/cgit";
  23
  24 int cgit_max_lock_attempts     =  5;
  25 int cgit_cache_root_ttl        =  5;
  26 int cgit_cache_repo_ttl        =  5;
  27 int cgit_cache_dynamic_ttl     =  5;
  28 int cgit_cache_static_ttl      = -1;
  29 int cgit_cache_max_create_time =  5;
  30
  31 char *cgit_repo_name    = NULL;
  32 char *cgit_repo_desc    = NULL;
  33 char *cgit_repo_owner   = NULL;
  34
  35 int cgit_query_has_symref = 0;
  36 int cgit_query_has_sha1   = 0;
  37
  38 char *cgit_querystring  = NULL;
  39 char *cgit_query_repo   = NULL;
  40 char *cgit_query_page   = NULL;
  41 char *cgit_query_head   = NULL;
  42 char *cgit_query_sha1   = NULL;
  43
  44 struct cacheitem cacheitem;
  45
  46 void cgit_global_config_cb(const char *name, const char *value)
  47 {
  48         if (!strcmp(name, "root"))
  49                 cgit_root = xstrdup(value);
  50         else if (!strcmp(name, "root-title"))
  51                 cgit_root_title = xstrdup(value);
  52         else if (!strcmp(name, "css"))
  53                 cgit_css = xstrdup(value);
  54         else if (!strcmp(name, "logo"))
  55                 cgit_logo = xstrdup(value);
  56         else if (!strcmp(name, "logo-link"))
  57                 cgit_logo_link = xstrdup(value);
  58         else if (!strcmp(name, "virtual-root"))
  59                 cgit_virtual_root = xstrdup(value);
  60 }
  61
  62 void cgit_repo_config_cb(const char *name, const char *value)
  63 {
  64         if (!strcmp(name, "name"))
  65                 cgit_repo_name = xstrdup(value);
  66         else if (!strcmp(name, "desc"))
  67                 cgit_repo_desc = xstrdup(value);
  68         else if (!strcmp(name, "owner"))
  69                 cgit_repo_owner = xstrdup(value);
  70 }
  71
  72 void cgit_querystring_cb(const char *name, const char *value)
  73 {
  74         if (!strcmp(name,"r"))
  75                 cgit_query_repo = xstrdup(value);
  76         else if (!strcmp(name, "p"))
  77                 cgit_query_page = xstrdup(value);
  78         else if (!strcmp(name, "h")) {
  79                 cgit_query_head = xstrdup(value);
  80                 cgit_query_has_symref = 1;
  81         } else if (!strcmp(name, "id")) {
  82                 cgit_query_sha1 = xstrdup(value);
  83                 cgit_query_has_sha1 = 1;
  84         }
  85 }
  86
  87 static void cgit_print_repo_page(struct cacheitem *item)
  88 {
  89         if (chdir(fmt("%s/%s", cgit_root, cgit_query_repo)) ||
  90             cgit_read_config("info/cgit", cgit_repo_config_cb)) {
  91                 char *title = fmt("%s - %s", cgit_root_title, "Bad request");
  92                 cgit_print_docstart(title, item);
  93                 cgit_print_pageheader(title);
  94                 cgit_print_error(fmt("Unable to scan repository: %s",
  95                                      strerror(errno)));
  96                 cgit_print_docend();
  97                 return;
  98         }
  99         setenv("GIT_DIR", fmt("%s/%s", cgit_root, cgit_query_repo), 1);
 100         char *title = fmt("%s - %s", cgit_repo_name, cgit_repo_desc);
 101         cgit_print_docstart(title, item);
 102         cgit_print_pageheader(title);
 103         if (!cgit_query_page)
 104                 cgit_print_summary();
 105         else if (!strcmp(cgit_query_page, "log")) {
 106                 cgit_print_log(cgit_query_head, 0, 100);
 107         } else if (!strcmp(cgit_query_page, "view")) {
 108                 cgit_print_view(cgit_query_sha1);
 109         }
 110         cgit_print_docend();
 111 }
 112
 113 static void cgit_fill_cache(struct cacheitem *item)
 114 {
 115         htmlfd = item->fd;
 116         item->st.st_mtime = time(NULL);
 117         if (cgit_query_repo)
 118                 cgit_print_repo_page(item);
 119         else
 120                 cgit_print_repolist(item);
 121 }
 122
 123 static void cgit_refresh_cache(struct cacheitem *item)
 124 {
 125         int i = 0;
 126
 127         cache_prepare(item);
 128  top:
 129         if (++i > cgit_max_lock_attempts) {
 130                 die("cgit_refresh_cache: unable to lock %s: %s",
 131                     item->name, strerror(errno));
 132         }
 133         if (!cache_exist(item)) {
 134                 if (!cache_lock(item)) {
 135                         sleep(1);
 136                         goto top;
 137                 }
 138                 if (!cache_exist(item))
 139                         cgit_fill_cache(item);
 140                 cache_unlock(item);
 141         } else if (cache_expired(item) && cache_lock(item)) {
 142                 if (cache_expired(item))
 143                         cgit_fill_cache(item);
 144                 cache_unlock(item);
 145         }
 146 }
 147
 148 static void cgit_print_cache(struct cacheitem *item)
 149 {
 150         static char buf[4096];
 151         ssize_t i;
 152
 153         int fd = open(item->name, O_RDONLY);
 154         if (fd<0)
 155                 die("Unable to open cached file %s", item->name);
 156
 157         while((i=read(fd, buf, sizeof(buf))) > 0)
 158                 write(STDOUT_FILENO, buf, i);
 159
 160         close(fd);
 161 }
 162
 163 int main(int argc, const char **argv)
 164 {
 165         cgit_read_config("/etc/cgitrc", cgit_global_config_cb);
 166         cgit_querystring = xstrdup(getenv("QUERY_STRING"));
 167         cgit_parse_query(cgit_querystring, cgit_querystring_cb);
 168         cgit_refresh_cache(&cacheitem);
 169         cgit_print_cache(&cacheitem);
 170         return 0;
 171 }