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 struct repoinfo *cgit_get_repoinfo(char *url)
  15 {
  16         int i;
  17         struct repoinfo *repo;
  18
  19         for (i=0; i<cgit_repolist.count; i++) {
  20                 repo = &cgit_repolist.repos[i];
  21                 if (!strcmp(repo->url, url))
  22                         return repo;
  23         }
  24         return NULL;
  25 }
  26
  27
  28 static int cgit_prepare_cache(struct cacheitem *item)
  29 {
  30         if (!cgit_query_repo) {
  31                 item->name = xstrdup(fmt("%s/index.html", cgit_cache_root));
  32                 item->ttl = cgit_cache_root_ttl;
  33                 return 1;
  34         }
  35         cgit_repo = cgit_get_repoinfo(cgit_query_repo);
  36         if (!cgit_repo) {
  37                 char *title = fmt("%s - %s", cgit_root_title, "Bad request");
  38                 cgit_print_docstart(title, item);
  39                 cgit_print_pageheader(title, 0);
  40                 cgit_print_error(fmt("Unknown repo: %s", cgit_query_repo));
  41                 cgit_print_docend();
  42                 return 0;
  43         }
  44
  45         if (!cgit_query_page) {
  46                 item->name = xstrdup(fmt("%s/%s/index.html", cgit_cache_root,
  47                            cgit_repo->url));
  48                 item->ttl = cgit_cache_repo_ttl;
  49         } else {
  50                 item->name = xstrdup(fmt("%s/%s/%s/%s.html", cgit_cache_root,
  51                            cgit_repo->url, cgit_query_page,
  52                            cache_safe_filename(cgit_querystring)));
  53                 if (cgit_query_has_symref)
  54                         item->ttl = cgit_cache_dynamic_ttl;
  55                 else if (cgit_query_has_sha1)
  56                         item->ttl = cgit_cache_static_ttl;
  57                 else
  58                         item->ttl = cgit_cache_repo_ttl;
  59         }
  60         return 1;
  61 }
  62
  63 static void cgit_print_repo_page(struct cacheitem *item)
  64 {
  65         char *title;
  66         int show_search;
  67
  68         if (!cgit_query_head)
  69                 cgit_query_head = cgit_repo->defbranch;
  70
  71         if (chdir(cgit_repo->path)) {
  72                 title = fmt("%s - %s", cgit_root_title, "Bad request");
  73                 cgit_print_docstart(title, item);
  74                 cgit_print_pageheader(title, 0);
  75                 cgit_print_error(fmt("Unable to scan repository: %s",
  76                                      strerror(errno)));
  77                 cgit_print_docend();
  78                 return;
  79         }
  80
  81         title = fmt("%s - %s", cgit_repo->name, cgit_repo->desc);
  82         show_search = 0;
  83         setenv("GIT_DIR", cgit_repo->path, 1);
  84
  85         if (cgit_query_page) {
  86             if (cgit_repo->snapshots && !strcmp(cgit_query_page, "snapshot")) {
  87                 cgit_print_snapshot(item, cgit_query_sha1, "zip",
  88                                     cgit_repo->url, cgit_query_name);
  89                 return;
  90             }
  91             if (!strcmp(cgit_query_page, "blob")) {
  92                     cgit_print_blob(item, cgit_query_sha1, cgit_query_path);
  93                     return;
  94             }
  95         }
  96
  97         if (cgit_query_page && !strcmp(cgit_query_page, "log"))
  98                 show_search = 1;
  99
 100         cgit_print_docstart(title, item);
 101
 102
 103         if (!cgit_query_page) {
 104                 cgit_print_pageheader("summary", show_search);
 105                 cgit_print_summary();
 106                 cgit_print_docend();
 107                 return;
 108         }
 109
 110         cgit_print_pageheader(cgit_query_page, show_search);
 111
 112         if (!strcmp(cgit_query_page, "log")) {
 113                 cgit_print_log(cgit_query_head, cgit_query_ofs,
 114                                cgit_max_commit_count, cgit_query_search,
 115                                cgit_query_path);
 116         } else if (!strcmp(cgit_query_page, "tree")) {
 117                 cgit_print_tree(cgit_query_head, cgit_query_sha1, cgit_query_path);
 118         } else if (!strcmp(cgit_query_page, "commit")) {
 119                 cgit_print_commit(cgit_query_head);
 120         } else if (!strcmp(cgit_query_page, "view")) {
 121                 cgit_print_view(cgit_query_sha1, cgit_query_path);
 122         } else if (!strcmp(cgit_query_page, "diff")) {
 123                 cgit_print_diff(cgit_query_head, cgit_query_sha1, cgit_query_sha2,
 124                                 cgit_query_path);
 125         } else {
 126                 cgit_print_error("Invalid request");
 127         }
 128         cgit_print_docend();
 129 }
 130
 131 static void cgit_fill_cache(struct cacheitem *item, int use_cache)
 132 {
 133         static char buf[PATH_MAX];
 134         int stdout2;
 135
 136         getcwd(buf, sizeof(buf));
 137         item->st.st_mtime = time(NULL);
 138
 139         if (use_cache) {
 140                 stdout2 = chk_positive(dup(STDOUT_FILENO),
 141                                        "Preserving STDOUT");
 142                 chk_zero(close(STDOUT_FILENO), "Closing STDOUT");
 143                 chk_positive(dup2(item->fd, STDOUT_FILENO), "Dup2(cachefile)");
 144         }
 145
 146         if (cgit_query_repo)
 147                 cgit_print_repo_page(item);
 148         else
 149                 cgit_print_repolist(item);
 150
 151         if (use_cache) {
 152                 chk_zero(close(STDOUT_FILENO), "Close redirected STDOUT");
 153                 chk_positive(dup2(stdout2, STDOUT_FILENO),
 154                              "Restoring original STDOUT");
 155                 chk_zero(close(stdout2), "Closing temporary STDOUT");
 156         }
 157
 158         chdir(buf);
 159 }
 160
 161 static void cgit_check_cache(struct cacheitem *item)
 162 {
 163         int i = 0;
 164
 165  top:
 166         if (++i > cgit_max_lock_attempts) {
 167                 die("cgit_refresh_cache: unable to lock %s: %s",
 168                     item->name, strerror(errno));
 169         }
 170         if (!cache_exist(item)) {
 171                 if (!cache_lock(item)) {
 172                         sleep(1);
 173                         goto top;
 174                 }
 175                 if (!cache_exist(item)) {
 176                         cgit_fill_cache(item, 1);
 177                         cache_unlock(item);
 178                 } else {
 179                         cache_cancel_lock(item);
 180                 }
 181         } else if (cache_expired(item) && cache_lock(item)) {
 182                 if (cache_expired(item)) {
 183                         cgit_fill_cache(item, 1);
 184                         cache_unlock(item);
 185                 } else {
 186                         cache_cancel_lock(item);
 187                 }
 188         }
 189 }
 190
 191 static void cgit_print_cache(struct cacheitem *item)
 192 {
 193         static char buf[4096];
 194         ssize_t i;
 195
 196         int fd = open(item->name, O_RDONLY);
 197         if (fd<0)
 198                 die("Unable to open cached file %s", item->name);
 199
 200         while((i=read(fd, buf, sizeof(buf))) > 0)
 201                 write(STDOUT_FILENO, buf, i);
 202
 203         close(fd);
 204 }
 205
 206 static void cgit_parse_args(int argc, const char **argv)
 207 {
 208         int i;
 209
 210         for (i = 1; i < argc; i++) {
 211                 if (!strncmp(argv[i], "--cache=", 8)) {
 212                         cgit_cache_root = xstrdup(argv[i]+8);
 213                 }
 214                 if (!strcmp(argv[i], "--nocache")) {
 215                         cgit_nocache = 1;
 216                 }
 217                 if (!strncmp(argv[i], "--query=", 8)) {
 218                         cgit_querystring = xstrdup(argv[i]+8);
 219                 }
 220                 if (!strncmp(argv[i], "--repo=", 7)) {
 221                         cgit_query_repo = xstrdup(argv[i]+7);
 222                 }
 223                 if (!strncmp(argv[i], "--page=", 7)) {
 224                         cgit_query_page = xstrdup(argv[i]+7);
 225                 }
 226                 if (!strncmp(argv[i], "--head=", 7)) {
 227                         cgit_query_head = xstrdup(argv[i]+7);
 228                         cgit_query_has_symref = 1;
 229                 }
 230                 if (!strncmp(argv[i], "--sha1=", 7)) {
 231                         cgit_query_sha1 = xstrdup(argv[i]+7);
 232                         cgit_query_has_sha1 = 1;
 233                 }
 234                 if (!strncmp(argv[i], "--ofs=", 6)) {
 235                         cgit_query_ofs = atoi(argv[i]+6);
 236                 }
 237         }
 238 }
 239
 240 int main(int argc, const char **argv)
 241 {
 242         struct cacheitem item;
 243
 244         htmlfd = STDOUT_FILENO;
 245         item.st.st_mtime = time(NULL);
 246         cgit_repolist.length = 0;
 247         cgit_repolist.count = 0;
 248         cgit_repolist.repos = NULL;
 249
 250         cgit_read_config(CGIT_CONFIG, cgit_global_config_cb);
 251         if (getenv("SCRIPT_NAME"))
 252                 cgit_script_name = xstrdup(getenv("SCRIPT_NAME"));
 253         if (getenv("QUERY_STRING"))
 254                 cgit_querystring = xstrdup(getenv("QUERY_STRING"));
 255         cgit_parse_args(argc, argv);
 256         cgit_parse_query(cgit_querystring, cgit_querystring_cb);
 257         if (!cgit_prepare_cache(&item))
 258                 return 0;
 259         if (cgit_nocache) {
 260                 cgit_fill_cache(&item, 0);
 261         } else {
 262                 cgit_check_cache(&item);
 263                 cgit_print_cache(&item);
 264         }
 265         return 0;
 266 }