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