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
11const char cgit_version[] = CGIT_VERSION;
12
13
14static 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
28static 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
63static 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) {
83 if (cgit_repo->snapshots && !strcmp(cgit_query_page, "snapshot")) {
84 cgit_print_snapshot(item, cgit_query_sha1, "zip",
85 cgit_repo->url, cgit_query_name);
86 return;
87 }
88 if (!strcmp(cgit_query_page, "blob")) {
89 cgit_print_blob(item, cgit_query_sha1, cgit_query_path);
90 return;
91 }
92 }
93
94 if (cgit_query_page && !strcmp(cgit_query_page, "log"))
95 show_search = 1;
96
97 cgit_print_docstart(title, item);
98
99
100 if (!cgit_query_page) {
101 cgit_print_pageheader("summary", show_search);
102 cgit_print_summary();
103 cgit_print_docend();
104 return;
105 }
106
107 cgit_print_pageheader(cgit_query_page, show_search);
108
109 if (!strcmp(cgit_query_page, "log")) {
110 cgit_print_log(cgit_query_head, cgit_query_ofs,
111 cgit_max_commit_count, cgit_query_search);
112 } else if (!strcmp(cgit_query_page, "tree")) {
113 cgit_print_tree(cgit_query_sha1, cgit_query_path);
114 } else if (!strcmp(cgit_query_page, "commit")) {
115 cgit_print_commit(cgit_query_sha1);
116 } else if (!strcmp(cgit_query_page, "view")) {
117 cgit_print_view(cgit_query_sha1, cgit_query_path);
118 } else if (!strcmp(cgit_query_page, "diff")) {
119 cgit_print_diff(cgit_query_sha1, cgit_query_sha2, cgit_query_path);
120 } else {
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_query_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
239 htmlfd = STDOUT_FILENO;
240 item.st.st_mtime = time(NULL);
241 cgit_repolist.length = 0;
242 cgit_repolist.count = 0;
243 cgit_repolist.repos = NULL;
244
245 cgit_read_config("/etc/cgitrc", cgit_global_config_cb);
246 if (getenv("QUERY_STRING"))
247 cgit_querystring = xstrdup(getenv("QUERY_STRING"));
248 cgit_parse_args(argc, argv);
249 cgit_parse_query(cgit_querystring, cgit_querystring_cb);
250 if (!cgit_prepare_cache(&item))
251 return 0;
252 if (cgit_nocache) {
253 cgit_fill_cache(&item, 0);
254 } else {
255 cgit_check_cache(&item);
256 cgit_print_cache(&item);
257 }
258 return 0;
259}