cgit.c (view raw)
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
11static int cgit_prepare_cache(struct cacheitem *item)
12{
13 if (!cgit_repo && cgit_query_repo) {
14 char *title = fmt("%s - %s", cgit_root_title, "Bad request");
15 cgit_print_docstart(title, item);
16 cgit_print_pageheader(title, 0);
17 cgit_print_error(fmt("Unknown repo: %s", cgit_query_repo));
18 cgit_print_docend();
19 return 0;
20 }
21
22 if (!cgit_repo) {
23 item->name = xstrdup(fmt("%s/index.html", cgit_cache_root));
24 item->ttl = cgit_cache_root_ttl;
25 return 1;
26 }
27
28 if (!cgit_cmd) {
29 item->name = xstrdup(fmt("%s/%s/index.%s.html", cgit_cache_root,
30 cache_safe_filename(cgit_repo->url),
31 cache_safe_filename(cgit_querystring)));
32 item->ttl = cgit_cache_repo_ttl;
33 } else {
34 item->name = xstrdup(fmt("%s/%s/%s/%s.html", cgit_cache_root,
35 cache_safe_filename(cgit_repo->url),
36 cgit_query_page,
37 cache_safe_filename(cgit_querystring)));
38 if (cgit_query_has_symref)
39 item->ttl = cgit_cache_dynamic_ttl;
40 else if (cgit_query_has_sha1)
41 item->ttl = cgit_cache_static_ttl;
42 else
43 item->ttl = cgit_cache_repo_ttl;
44 }
45 return 1;
46}
47
48struct refmatch {
49 char *req_ref;
50 char *first_ref;
51 int match;
52};
53
54int find_current_ref(const char *refname, const unsigned char *sha1,
55 int flags, void *cb_data)
56{
57 struct refmatch *info;
58
59 info = (struct refmatch *)cb_data;
60 if (!strcmp(refname, info->req_ref))
61 info->match = 1;
62 if (!info->first_ref)
63 info->first_ref = xstrdup(refname);
64 return info->match;
65}
66
67char *find_default_branch(struct repoinfo *repo)
68{
69 struct refmatch info;
70
71 info.req_ref = repo->defbranch;
72 info.first_ref = NULL;
73 info.match = 0;
74 for_each_branch_ref(find_current_ref, &info);
75 if (info.match)
76 return info.req_ref;
77 else
78 return info.first_ref;
79}
80
81static void cgit_print_repo_page(struct cacheitem *item)
82{
83 char *title, *tmp;
84 int show_search;
85 unsigned char sha1[20];
86
87 if (chdir(cgit_repo->path)) {
88 title = fmt("%s - %s", cgit_root_title, "Bad request");
89 cgit_print_docstart(title, item);
90 cgit_print_pageheader(title, 0);
91 cgit_print_error(fmt("Unable to scan repository: %s",
92 strerror(errno)));
93 cgit_print_docend();
94 return;
95 }
96
97 title = fmt("%s - %s", cgit_repo->name, cgit_repo->desc);
98 show_search = 0;
99 setenv("GIT_DIR", cgit_repo->path, 1);
100
101 if (!cgit_query_head) {
102 cgit_query_head = xstrdup(find_default_branch(cgit_repo));
103 cgit_repo->defbranch = cgit_query_head;
104 }
105
106 if (!cgit_query_head) {
107 cgit_print_docstart(title, item);
108 cgit_print_pageheader(title, 0);
109 cgit_print_error("Repository seems to be empty");
110 cgit_print_docend();
111 return;
112 }
113
114 if (get_sha1(cgit_query_head, sha1)) {
115 tmp = xstrdup(cgit_query_head);
116 cgit_query_head = cgit_repo->defbranch;
117 cgit_print_docstart(title, item);
118 cgit_print_pageheader(title, 0);
119 cgit_print_error(fmt("Invalid branch: %s", tmp));
120 cgit_print_docend();
121 return;
122 }
123
124 if ((cgit_cmd == CMD_SNAPSHOT) && cgit_repo->snapshots) {
125 cgit_print_snapshot(item, cgit_query_head, cgit_query_sha1,
126 cgit_repobasename(cgit_repo->url),
127 cgit_query_path,
128 cgit_repo->snapshots );
129 return;
130 }
131
132 if (cgit_cmd == CMD_PATCH) {
133 cgit_print_patch(cgit_query_sha1, item);
134 return;
135 }
136
137 if (cgit_cmd == CMD_BLOB) {
138 cgit_print_blob(item, cgit_query_sha1, cgit_query_path);
139 return;
140 }
141
142 show_search = (cgit_cmd == CMD_LOG);
143 cgit_print_docstart(title, item);
144 if (!cgit_cmd) {
145 cgit_print_pageheader("summary", show_search);
146 cgit_print_summary();
147 cgit_print_docend();
148 return;
149 }
150
151 cgit_print_pageheader(cgit_query_page, show_search);
152
153 switch(cgit_cmd) {
154 case CMD_LOG:
155 cgit_print_log(cgit_query_sha1, cgit_query_ofs,
156 cgit_max_commit_count, cgit_query_grep, cgit_query_search,
157 cgit_query_path, 1);
158 break;
159 case CMD_TREE:
160 cgit_print_tree(cgit_query_sha1, cgit_query_path);
161 break;
162 case CMD_COMMIT:
163 cgit_print_commit(cgit_query_sha1);
164 break;
165 case CMD_REFS:
166 cgit_print_refs();
167 break;
168 case CMD_TAG:
169 cgit_print_tag(cgit_query_sha1);
170 break;
171 case CMD_DIFF:
172 cgit_print_diff(cgit_query_sha1, cgit_query_sha2, cgit_query_path);
173 break;
174 default:
175 cgit_print_error("Invalid request");
176 }
177 cgit_print_docend();
178}
179
180static void cgit_fill_cache(struct cacheitem *item, int use_cache)
181{
182 static char buf[PATH_MAX];
183 int stdout2;
184
185 getcwd(buf, sizeof(buf));
186 item->st.st_mtime = time(NULL);
187
188 if (use_cache) {
189 stdout2 = chk_positive(dup(STDOUT_FILENO),
190 "Preserving STDOUT");
191 chk_zero(close(STDOUT_FILENO), "Closing STDOUT");
192 chk_positive(dup2(item->fd, STDOUT_FILENO), "Dup2(cachefile)");
193 }
194
195 if (cgit_repo)
196 cgit_print_repo_page(item);
197 else
198 cgit_print_repolist(item);
199
200 if (use_cache) {
201 chk_zero(close(STDOUT_FILENO), "Close redirected STDOUT");
202 chk_positive(dup2(stdout2, STDOUT_FILENO),
203 "Restoring original STDOUT");
204 chk_zero(close(stdout2), "Closing temporary STDOUT");
205 }
206
207 chdir(buf);
208}
209
210static void cgit_check_cache(struct cacheitem *item)
211{
212 int i = 0;
213
214 top:
215 if (++i > cgit_max_lock_attempts) {
216 die("cgit_refresh_cache: unable to lock %s: %s",
217 item->name, strerror(errno));
218 }
219 if (!cache_exist(item)) {
220 if (!cache_lock(item)) {
221 sleep(1);
222 goto top;
223 }
224 if (!cache_exist(item)) {
225 cgit_fill_cache(item, 1);
226 cache_unlock(item);
227 } else {
228 cache_cancel_lock(item);
229 }
230 } else if (cache_expired(item) && cache_lock(item)) {
231 if (cache_expired(item)) {
232 cgit_fill_cache(item, 1);
233 cache_unlock(item);
234 } else {
235 cache_cancel_lock(item);
236 }
237 }
238}
239
240static void cgit_print_cache(struct cacheitem *item)
241{
242 static char buf[4096];
243 ssize_t i;
244
245 int fd = open(item->name, O_RDONLY);
246 if (fd<0)
247 die("Unable to open cached file %s", item->name);
248
249 while((i=read(fd, buf, sizeof(buf))) > 0)
250 write(STDOUT_FILENO, buf, i);
251
252 close(fd);
253}
254
255static void cgit_parse_args(int argc, const char **argv)
256{
257 int i;
258
259 for (i = 1; i < argc; i++) {
260 if (!strncmp(argv[i], "--cache=", 8)) {
261 cgit_cache_root = xstrdup(argv[i]+8);
262 }
263 if (!strcmp(argv[i], "--nocache")) {
264 cgit_nocache = 1;
265 }
266 if (!strncmp(argv[i], "--query=", 8)) {
267 cgit_querystring = xstrdup(argv[i]+8);
268 }
269 if (!strncmp(argv[i], "--repo=", 7)) {
270 cgit_query_repo = xstrdup(argv[i]+7);
271 }
272 if (!strncmp(argv[i], "--page=", 7)) {
273 cgit_query_page = xstrdup(argv[i]+7);
274 }
275 if (!strncmp(argv[i], "--head=", 7)) {
276 cgit_query_head = xstrdup(argv[i]+7);
277 cgit_query_has_symref = 1;
278 }
279 if (!strncmp(argv[i], "--sha1=", 7)) {
280 cgit_query_sha1 = xstrdup(argv[i]+7);
281 cgit_query_has_sha1 = 1;
282 }
283 if (!strncmp(argv[i], "--ofs=", 6)) {
284 cgit_query_ofs = atoi(argv[i]+6);
285 }
286 }
287}
288
289int main(int argc, const char **argv)
290{
291 struct cacheitem item;
292 const char *cgit_config_env = getenv("CGIT_CONFIG");
293
294 htmlfd = STDOUT_FILENO;
295 item.st.st_mtime = time(NULL);
296 cgit_repolist.length = 0;
297 cgit_repolist.count = 0;
298 cgit_repolist.repos = NULL;
299
300 cgit_read_config(cgit_config_env ? cgit_config_env : CGIT_CONFIG,
301 cgit_global_config_cb);
302 cgit_repo = NULL;
303 if (getenv("SCRIPT_NAME"))
304 cgit_script_name = xstrdup(getenv("SCRIPT_NAME"));
305 if (getenv("QUERY_STRING"))
306 cgit_querystring = xstrdup(getenv("QUERY_STRING"));
307 cgit_parse_args(argc, argv);
308 cgit_parse_query(cgit_querystring, cgit_querystring_cb);
309 if (!cgit_prepare_cache(&item))
310 return 0;
311 if (cgit_nocache) {
312 cgit_fill_cache(&item, 0);
313 } else {
314 cgit_check_cache(&item);
315 cgit_print_cache(&item);
316 }
317 return 0;
318}