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