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
  14 static int cgit_prepare_cache(struct cacheitem *item)
  15 {
  16         if (!cgit_query_repo) {
  17                 item->name = xstrdup(fmt("%s/index.html", cgit_cache_root));
  18                 item->ttl = cgit_cache_root_ttl;
  19                 return 1;
  20         }
  21         cgit_repo = cgit_get_repoinfo(cgit_query_repo);
  22         if (!cgit_repo) {
  23                 char *title = fmt("%s - %s", cgit_root_title, "Bad request");
  24                 cgit_print_docstart(title, item);
  25                 cgit_print_pageheader(title, 0);
  26                 cgit_print_error(fmt("Unknown repo: %s", cgit_query_repo));
  27                 cgit_print_docend();
  28                 return 0;
  29         }
  30
  31         if (!cgit_query_page) {
  32                 item->name = xstrdup(fmt("%s/%s/index.html", cgit_cache_root,
  33                            cgit_repo->url));
  34                 item->ttl = cgit_cache_repo_ttl;
  35         } else {
  36                 item->name = xstrdup(fmt("%s/%s/%s/%s.html", cgit_cache_root,
  37                            cgit_repo->url, cgit_query_page,
  38                            cache_safe_filename(cgit_querystring)));
  39                 if (cgit_query_has_symref)
  40                         item->ttl = cgit_cache_dynamic_ttl;
  41                 else if (cgit_query_has_sha1)
  42                         item->ttl = cgit_cache_static_ttl;
  43                 else
  44                         item->ttl = cgit_cache_repo_ttl;
  45         }
  46         return 1;
  47 }
  48
  49 static void cgit_print_repo_page(struct cacheitem *item)
  50 {
  51         char *title;
  52         int show_search;
  53
  54         if (!cgit_query_head)
  55                 cgit_query_head = cgit_repo->defbranch;
  56
  57         if (chdir(cgit_repo->path)) {
  58                 title = fmt("%s - %s", cgit_root_title, "Bad request");
  59                 cgit_print_docstart(title, item);
  60                 cgit_print_pageheader(title, 0);
  61                 cgit_print_error(fmt("Unable to scan repository: %s",
  62                                      strerror(errno)));
  63                 cgit_print_docend();
  64                 return;
  65         }
  66
  67         title = fmt("%s - %s", cgit_repo->name, cgit_repo->desc);
  68         show_search = 0;
  69         setenv("GIT_DIR", cgit_repo->path, 1);
  70
  71         if (cgit_query_page) {
  72             if (cgit_repo->snapshots && !strcmp(cgit_query_page, "snapshot")) {
  73                 cgit_print_snapshot(item, cgit_query_sha1, "zip",
  74                                     cgit_repo->url, cgit_query_name);
  75                 return;
  76             }
  77             if (!strcmp(cgit_query_page, "blob")) {
  78                     cgit_print_blob(item, cgit_query_sha1, cgit_query_path);
  79                     return;
  80             }
  81         }
  82
  83         if (cgit_query_page && !strcmp(cgit_query_page, "log"))
  84                 show_search = 1;
  85
  86         cgit_print_docstart(title, item);
  87
  88
  89         if (!cgit_query_page) {
  90                 cgit_print_pageheader("summary", show_search);
  91                 cgit_print_summary();
  92                 cgit_print_docend();
  93                 return;
  94         }
  95
  96         cgit_print_pageheader(cgit_query_page, show_search);
  97
  98         if (!strcmp(cgit_query_page, "log")) {
  99                 cgit_print_log(cgit_query_head, cgit_query_ofs,
 100                                cgit_max_commit_count, cgit_query_search,
 101                                cgit_query_path);
 102         } else if (!strcmp(cgit_query_page, "tree")) {
 103                 cgit_print_tree(cgit_query_head, cgit_query_sha1, cgit_query_path);
 104         } else if (!strcmp(cgit_query_page, "commit")) {
 105                 cgit_print_commit(cgit_query_head);
 106         } else if (!strcmp(cgit_query_page, "view")) {
 107                 cgit_print_view(cgit_query_sha1, cgit_query_path);
 108         } else if (!strcmp(cgit_query_page, "diff")) {
 109                 cgit_print_diff(cgit_query_head, cgit_query_sha1, cgit_query_sha2,
 110                                 cgit_query_path);
 111         } else {
 112                 cgit_print_error("Invalid request");
 113         }
 114         cgit_print_docend();
 115 }
 116
 117 static void cgit_fill_cache(struct cacheitem *item, int use_cache)
 118 {
 119         static char buf[PATH_MAX];
 120         int stdout2;
 121
 122         getcwd(buf, sizeof(buf));
 123         item->st.st_mtime = time(NULL);
 124
 125         if (use_cache) {
 126                 stdout2 = chk_positive(dup(STDOUT_FILENO),
 127                                        "Preserving STDOUT");
 128                 chk_zero(close(STDOUT_FILENO), "Closing STDOUT");
 129                 chk_positive(dup2(item->fd, STDOUT_FILENO), "Dup2(cachefile)");
 130         }
 131
 132         if (cgit_query_repo)
 133                 cgit_print_repo_page(item);
 134         else
 135                 cgit_print_repolist(item);
 136
 137         if (use_cache) {
 138                 chk_zero(close(STDOUT_FILENO), "Close redirected STDOUT");
 139                 chk_positive(dup2(stdout2, STDOUT_FILENO),
 140                              "Restoring original STDOUT");
 141                 chk_zero(close(stdout2), "Closing temporary STDOUT");
 142         }
 143
 144         chdir(buf);
 145 }
 146
 147 static void cgit_check_cache(struct cacheitem *item)
 148 {
 149         int i = 0;
 150
 151  top:
 152         if (++i > cgit_max_lock_attempts) {
 153                 die("cgit_refresh_cache: unable to lock %s: %s",
 154                     item->name, strerror(errno));
 155         }
 156         if (!cache_exist(item)) {
 157                 if (!cache_lock(item)) {
 158                         sleep(1);
 159                         goto top;
 160                 }
 161                 if (!cache_exist(item)) {
 162                         cgit_fill_cache(item, 1);
 163                         cache_unlock(item);
 164                 } else {
 165                         cache_cancel_lock(item);
 166                 }
 167         } else if (cache_expired(item) && cache_lock(item)) {
 168                 if (cache_expired(item)) {
 169                         cgit_fill_cache(item, 1);
 170                         cache_unlock(item);
 171                 } else {
 172                         cache_cancel_lock(item);
 173                 }
 174         }
 175 }
 176
 177 static void cgit_print_cache(struct cacheitem *item)
 178 {
 179         static char buf[4096];
 180         ssize_t i;
 181
 182         int fd = open(item->name, O_RDONLY);
 183         if (fd<0)
 184                 die("Unable to open cached file %s", item->name);
 185
 186         while((i=read(fd, buf, sizeof(buf))) > 0)
 187                 write(STDOUT_FILENO, buf, i);
 188
 189         close(fd);
 190 }
 191
 192 static void cgit_parse_args(int argc, const char **argv)
 193 {
 194         int i;
 195
 196         for (i = 1; i < argc; i++) {
 197                 if (!strncmp(argv[i], "--cache=", 8)) {
 198                         cgit_cache_root = xstrdup(argv[i]+8);
 199                 }
 200                 if (!strcmp(argv[i], "--nocache")) {
 201                         cgit_nocache = 1;
 202                 }
 203                 if (!strncmp(argv[i], "--query=", 8)) {
 204                         cgit_querystring = xstrdup(argv[i]+8);
 205                 }
 206                 if (!strncmp(argv[i], "--repo=", 7)) {
 207                         cgit_query_repo = xstrdup(argv[i]+7);
 208                 }
 209                 if (!strncmp(argv[i], "--page=", 7)) {
 210                         cgit_query_page = xstrdup(argv[i]+7);
 211                 }
 212                 if (!strncmp(argv[i], "--head=", 7)) {
 213                         cgit_query_head = xstrdup(argv[i]+7);
 214                         cgit_query_has_symref = 1;
 215                 }
 216                 if (!strncmp(argv[i], "--sha1=", 7)) {
 217                         cgit_query_sha1 = xstrdup(argv[i]+7);
 218                         cgit_query_has_sha1 = 1;
 219                 }
 220                 if (!strncmp(argv[i], "--ofs=", 6)) {
 221                         cgit_query_ofs = atoi(argv[i]+6);
 222                 }
 223         }
 224 }
 225
 226 int main(int argc, const char **argv)
 227 {
 228         struct cacheitem item;
 229
 230         htmlfd = STDOUT_FILENO;
 231         item.st.st_mtime = time(NULL);
 232         cgit_repolist.length = 0;
 233         cgit_repolist.count = 0;
 234         cgit_repolist.repos = NULL;
 235
 236         cgit_read_config(CGIT_CONFIG, cgit_global_config_cb);
 237         if (getenv("SCRIPT_NAME"))
 238                 cgit_script_name = xstrdup(getenv("SCRIPT_NAME"));
 239         if (getenv("QUERY_STRING"))
 240                 cgit_querystring = xstrdup(getenv("QUERY_STRING"));
 241         cgit_parse_args(argc, argv);
 242         cgit_parse_query(cgit_querystring, cgit_querystring_cb);
 243         if (!cgit_prepare_cache(&item))
 244                 return 0;
 245         if (cgit_nocache) {
 246                 cgit_fill_cache(&item, 0);
 247         } else {
 248                 cgit_check_cache(&item);
 249                 cgit_print_cache(&item);
 250         }
 251         return 0;
 252 }