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_prepare_cache(struct cacheitem *item)
  14 {
  15         if (!cgit_query_repo) {
  16                 item->name = xstrdup(fmt("%s/index.html", cgit_cache_root));
  17                 item->ttl = cgit_cache_root_ttl;
  18         } else if (!cgit_query_page) {
  19                 item->name = xstrdup(fmt("%s/%s/index.html", cgit_cache_root,
  20                            cgit_query_repo));
  21                 item->ttl = cgit_cache_repo_ttl;
  22         } else {
  23                 item->name = xstrdup(fmt("%s/%s/%s/%s.html", cgit_cache_root,
  24                            cgit_query_repo, cgit_query_page,
  25                            cache_safe_filename(cgit_querystring)));
  26                 if (cgit_query_has_symref)
  27                         item->ttl = cgit_cache_dynamic_ttl;
  28                 else if (cgit_query_has_sha1)
  29                         item->ttl = cgit_cache_static_ttl;
  30                 else
  31                         item->ttl = cgit_cache_repo_ttl;
  32         }
  33 }
  34
  35 static void cgit_print_repo_page(struct cacheitem *item)
  36 {
  37         if (chdir(fmt("%s/%s", cgit_root, cgit_query_repo)) ||
  38             cgit_read_config("info/cgit", cgit_repo_config_cb)) {
  39                 char *title = fmt("%s - %s", cgit_root_title, "Bad request");
  40                 cgit_print_docstart(title, item);
  41                 cgit_print_pageheader(title, 0);
  42                 cgit_print_error(fmt("Unable to scan repository: %s",
  43                                      strerror(errno)));
  44                 cgit_print_docend();
  45                 return;
  46         }
  47         setenv("GIT_DIR", fmt("%s/%s", cgit_root, cgit_query_repo), 1);
  48         char *title = fmt("%s - %s", cgit_repo_name, cgit_repo_desc);
  49         int show_search = 0;
  50         if (cgit_query_page && !strcmp(cgit_query_page, "log"))
  51                 show_search = 1;
  52         cgit_print_docstart(title, item);
  53         cgit_print_pageheader(title, show_search);
  54         if (!cgit_query_page) {
  55                 cgit_print_summary();
  56         } else if (!strcmp(cgit_query_page, "log")) {
  57                 cgit_print_log(cgit_query_head, cgit_query_ofs, 100, cgit_query_search);
  58         } else if (!strcmp(cgit_query_page, "tree")) {
  59                 cgit_print_tree(cgit_query_sha1);
  60         } else if (!strcmp(cgit_query_page, "commit")) {
  61                 cgit_print_commit(cgit_query_sha1);
  62         } else if (!strcmp(cgit_query_page, "view")) {
  63                 cgit_print_view(cgit_query_sha1);
  64         } else if (!strcmp(cgit_query_page, "diff")) {
  65                 cgit_print_diff(cgit_query_sha1, cgit_query_sha2);
  66         }
  67         cgit_print_docend();
  68 }
  69
  70 static void cgit_fill_cache(struct cacheitem *item)
  71 {
  72         static char buf[PATH_MAX];
  73
  74         getcwd(buf, sizeof(buf));
  75         htmlfd = item->fd;
  76         item->st.st_mtime = time(NULL);
  77         if (cgit_query_repo)
  78                 cgit_print_repo_page(item);
  79         else
  80                 cgit_print_repolist(item);
  81         chdir(buf);
  82 }
  83
  84 static void cgit_check_cache(struct cacheitem *item)
  85 {
  86         int i = 0;
  87
  88  top:
  89         if (++i > cgit_max_lock_attempts) {
  90                 die("cgit_refresh_cache: unable to lock %s: %s",
  91                     item->name, strerror(errno));
  92         }
  93         if (!cache_exist(item)) {
  94                 if (!cache_lock(item)) {
  95                         sleep(1);
  96                         goto top;
  97                 }
  98                 if (!cache_exist(item)) {
  99                         cgit_fill_cache(item);
 100                         cache_unlock(item);
 101                 } else {
 102                         cache_cancel_lock(item);
 103                 }
 104         } else if (cache_expired(item) && cache_lock(item)) {
 105                 if (cache_expired(item)) {
 106                         cgit_fill_cache(item);
 107                         cache_unlock(item);
 108                 } else {
 109                         cache_cancel_lock(item);
 110                 }
 111         }
 112 }
 113
 114 static void cgit_print_cache(struct cacheitem *item)
 115 {
 116         static char buf[4096];
 117         ssize_t i;
 118
 119         int fd = open(item->name, O_RDONLY);
 120         if (fd<0)
 121                 die("Unable to open cached file %s", item->name);
 122
 123         while((i=read(fd, buf, sizeof(buf))) > 0)
 124                 write(STDOUT_FILENO, buf, i);
 125
 126         close(fd);
 127 }
 128
 129 static void cgit_parse_args(int argc, const char **argv)
 130 {
 131         int i;
 132
 133         for (i = 1; i < argc; i++) {
 134                 if (!strncmp(argv[i], "--root=", 7)) {
 135                         cgit_root = xstrdup(argv[i]+7);
 136                 }
 137                 if (!strncmp(argv[i], "--cache=", 8)) {
 138                         cgit_cache_root = xstrdup(argv[i]+8);
 139                 }
 140                 if (!strcmp(argv[i], "--nocache")) {
 141                         cgit_nocache = 1;
 142                 }
 143                 if (!strncmp(argv[i], "--query=", 8)) {
 144                         cgit_querystring = xstrdup(argv[i]+8);
 145                 }
 146                 if (!strncmp(argv[i], "--repo=", 7)) {
 147                         cgit_query_repo = xstrdup(argv[i]+7);
 148                 }
 149                 if (!strncmp(argv[i], "--page=", 7)) {
 150                         cgit_query_page = xstrdup(argv[i]+7);
 151                 }
 152                 if (!strncmp(argv[i], "--head=", 7)) {
 153                         cgit_query_head = xstrdup(argv[i]+7);
 154                         cgit_query_has_symref = 1;
 155                 }
 156                 if (!strncmp(argv[i], "--sha1=", 7)) {
 157                         cgit_query_sha1 = xstrdup(argv[i]+7);
 158                         cgit_query_has_sha1 = 1;
 159                 }
 160                 if (!strncmp(argv[i], "--ofs=", 6)) {
 161                         cgit_query_ofs = atoi(argv[i]+6);
 162                 }
 163         }
 164 }
 165
 166 int main(int argc, const char **argv)
 167 {
 168         struct cacheitem item;
 169
 170         cgit_read_config("/etc/cgitrc", cgit_global_config_cb);
 171         if (getenv("QUERY_STRING"))
 172                 cgit_querystring = xstrdup(getenv("QUERY_STRING"));
 173         cgit_parse_args(argc, argv);
 174         cgit_parse_query(cgit_querystring, cgit_querystring_cb);
 175
 176         cgit_prepare_cache(&item);
 177         if (cgit_nocache) {
 178                 item.fd = STDOUT_FILENO;
 179                 cgit_fill_cache(&item);
 180         } else {
 181                 cgit_check_cache(&item);
 182                 cgit_print_cache(&item);
 183         }
 184         return 0;
 185 }