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, 0);
  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         int show_search = 0;
  28         if (cgit_query_page && !strcmp(cgit_query_page, "log"))
  29                 show_search = 1;
  30         cgit_print_docstart(title, item);
  31         cgit_print_pageheader(title, show_search);
  32         if (!cgit_query_page) {
  33                 cgit_print_summary();
  34         } else if (!strcmp(cgit_query_page, "log")) {
  35                 cgit_print_log(cgit_query_head, cgit_query_ofs, 100, cgit_query_search);
  36         } else if (!strcmp(cgit_query_page, "tree")) {
  37                 cgit_print_tree(cgit_query_sha1);
  38         } else if (!strcmp(cgit_query_page, "commit")) {
  39                 cgit_print_commit(cgit_query_sha1);
  40         } else if (!strcmp(cgit_query_page, "view")) {
  41                 cgit_print_view(cgit_query_sha1);
  42         } else if (!strcmp(cgit_query_page, "diff")) {
  43                 cgit_print_diff(cgit_query_sha1, cgit_query_sha2);
  44         }
  45         cgit_print_docend();
  46 }
  47
  48 static void cgit_fill_cache(struct cacheitem *item)
  49 {
  50         static char buf[PATH_MAX];
  51
  52         getcwd(buf, sizeof(buf));
  53         htmlfd = item->fd;
  54         item->st.st_mtime = time(NULL);
  55         if (cgit_query_repo)
  56                 cgit_print_repo_page(item);
  57         else
  58                 cgit_print_repolist(item);
  59         chdir(buf);
  60 }
  61
  62 static void cgit_check_cache(struct cacheitem *item)
  63 {
  64         int i = 0;
  65
  66         cache_prepare(item);
  67  top:
  68         if (++i > cgit_max_lock_attempts) {
  69                 die("cgit_refresh_cache: unable to lock %s: %s",
  70                     item->name, strerror(errno));
  71         }
  72         if (!cache_exist(item)) {
  73                 if (!cache_lock(item)) {
  74                         sleep(1);
  75                         goto top;
  76                 }
  77                 if (!cache_exist(item)) {
  78                         cgit_fill_cache(item);
  79                         cache_unlock(item);
  80                 } else {
  81                         cache_cancel_lock(item);
  82                 }
  83         } else if (cache_expired(item) && cache_lock(item)) {
  84                 if (cache_expired(item)) {
  85                         cgit_fill_cache(item);
  86                         cache_unlock(item);
  87                 } else {
  88                         cache_cancel_lock(item);
  89                 }
  90         }
  91 }
  92
  93 static void cgit_print_cache(struct cacheitem *item)
  94 {
  95         static char buf[4096];
  96         ssize_t i;
  97
  98         int fd = open(item->name, O_RDONLY);
  99         if (fd<0)
 100                 die("Unable to open cached file %s", item->name);
 101
 102         while((i=read(fd, buf, sizeof(buf))) > 0)
 103                 write(STDOUT_FILENO, buf, i);
 104
 105         close(fd);
 106 }
 107
 108 static void cgit_parse_args(int argc, const char **argv)
 109 {
 110         int i;
 111
 112         for (i = 1; i < argc; i++) {
 113                 if (!strncmp(argv[i], "--root=", 7)) {
 114                         cgit_root = xstrdup(argv[i]+7);
 115                 }
 116                 if (!strncmp(argv[i], "--cache=", 8)) {
 117                         cgit_cache_root = xstrdup(argv[i]+8);
 118                 }
 119                 if (!strcmp(argv[i], "--nocache")) {
 120                         cgit_nocache = 1;
 121                 }
 122                 if (!strncmp(argv[i], "--query=", 8)) {
 123                         cgit_querystring = xstrdup(argv[i]+8);
 124                 }
 125                 if (!strncmp(argv[i], "--repo=", 7)) {
 126                         cgit_query_repo = xstrdup(argv[i]+7);
 127                 }
 128                 if (!strncmp(argv[i], "--page=", 7)) {
 129                         cgit_query_page = xstrdup(argv[i]+7);
 130                 }
 131                 if (!strncmp(argv[i], "--head=", 7)) {
 132                         cgit_query_head = xstrdup(argv[i]+7);
 133                         cgit_query_has_symref = 1;
 134                 }
 135                 if (!strncmp(argv[i], "--sha1=", 7)) {
 136                         cgit_query_sha1 = xstrdup(argv[i]+7);
 137                         cgit_query_has_sha1 = 1;
 138                 }
 139                 if (!strncmp(argv[i], "--ofs=", 6)) {
 140                         cgit_query_ofs = atoi(argv[i]+6);
 141                 }
 142         }
 143 }
 144
 145 int main(int argc, const char **argv)
 146 {
 147         struct cacheitem item;
 148
 149         cgit_read_config("/etc/cgitrc", cgit_global_config_cb);
 150         if (getenv("QUERY_STRING"))
 151                 cgit_querystring = xstrdup(getenv("QUERY_STRING"));
 152         cgit_parse_args(argc, argv);
 153         cgit_parse_query(cgit_querystring, cgit_querystring_cb);
 154
 155         if (cgit_nocache) {
 156                 item.fd = STDOUT_FILENO;
 157                 cgit_fill_cache(&item);
 158         } else {
 159                 cgit_check_cache(&item);
 160                 cgit_print_cache(&item);
 161         }
 162         return 0;
 163 }