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