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_sha1,
72 cgit_repobasename(cgit_repo->url),
73 cgit_query_name,
74 cgit_repo->snapshots );
75 return;
76 }
77
78 if (cgit_cmd == CMD_BLOB) {
79 cgit_print_blob(item, cgit_query_sha1, cgit_query_path);
80 return;
81 }
82
83 show_search = (cgit_cmd == CMD_LOG);
84 cgit_print_docstart(title, item);
85 if (!cgit_cmd) {
86 cgit_print_pageheader("summary", show_search);
87 cgit_print_summary();
88 cgit_print_docend();
89 return;
90 }
91
92 cgit_print_pageheader(cgit_query_page, show_search);
93
94 switch(cgit_cmd) {
95 case CMD_LOG:
96 cgit_print_log(cgit_query_sha1, cgit_query_ofs,
97 cgit_max_commit_count, cgit_query_search,
98 cgit_query_path, 1);
99 break;
100 case CMD_TREE:
101 cgit_print_tree(cgit_query_sha1, cgit_query_path);
102 break;
103 case CMD_COMMIT:
104 cgit_print_commit(cgit_query_sha1);
105 break;
106 case CMD_DIFF:
107 cgit_print_diff(cgit_query_sha1, cgit_query_sha2);
108 break;
109 default:
110 cgit_print_error("Invalid request");
111 }
112 cgit_print_docend();
113}
114
115static void cgit_fill_cache(struct cacheitem *item, int use_cache)
116{
117 static char buf[PATH_MAX];
118 int stdout2;
119
120 getcwd(buf, sizeof(buf));
121 item->st.st_mtime = time(NULL);
122
123 if (use_cache) {
124 stdout2 = chk_positive(dup(STDOUT_FILENO),
125 "Preserving STDOUT");
126 chk_zero(close(STDOUT_FILENO), "Closing STDOUT");
127 chk_positive(dup2(item->fd, STDOUT_FILENO), "Dup2(cachefile)");
128 }
129
130 if (cgit_repo)
131 cgit_print_repo_page(item);
132 else
133 cgit_print_repolist(item);
134
135 if (use_cache) {
136 chk_zero(close(STDOUT_FILENO), "Close redirected STDOUT");
137 chk_positive(dup2(stdout2, STDOUT_FILENO),
138 "Restoring original STDOUT");
139 chk_zero(close(stdout2), "Closing temporary STDOUT");
140 }
141
142 chdir(buf);
143}
144
145static void cgit_check_cache(struct cacheitem *item)
146{
147 int i = 0;
148
149 top:
150 if (++i > cgit_max_lock_attempts) {
151 die("cgit_refresh_cache: unable to lock %s: %s",
152 item->name, strerror(errno));
153 }
154 if (!cache_exist(item)) {
155 if (!cache_lock(item)) {
156 sleep(1);
157 goto top;
158 }
159 if (!cache_exist(item)) {
160 cgit_fill_cache(item, 1);
161 cache_unlock(item);
162 } else {
163 cache_cancel_lock(item);
164 }
165 } else if (cache_expired(item) && cache_lock(item)) {
166 if (cache_expired(item)) {
167 cgit_fill_cache(item, 1);
168 cache_unlock(item);
169 } else {
170 cache_cancel_lock(item);
171 }
172 }
173}
174
175static void cgit_print_cache(struct cacheitem *item)
176{
177 static char buf[4096];
178 ssize_t i;
179
180 int fd = open(item->name, O_RDONLY);
181 if (fd<0)
182 die("Unable to open cached file %s", item->name);
183
184 while((i=read(fd, buf, sizeof(buf))) > 0)
185 write(STDOUT_FILENO, buf, i);
186
187 close(fd);
188}
189
190static void cgit_parse_args(int argc, const char **argv)
191{
192 int i;
193
194 for (i = 1; i < argc; i++) {
195 if (!strncmp(argv[i], "--cache=", 8)) {
196 cgit_cache_root = xstrdup(argv[i]+8);
197 }
198 if (!strcmp(argv[i], "--nocache")) {
199 cgit_nocache = 1;
200 }
201 if (!strncmp(argv[i], "--query=", 8)) {
202 cgit_querystring = xstrdup(argv[i]+8);
203 }
204 if (!strncmp(argv[i], "--repo=", 7)) {
205 cgit_query_repo = xstrdup(argv[i]+7);
206 }
207 if (!strncmp(argv[i], "--page=", 7)) {
208 cgit_query_page = xstrdup(argv[i]+7);
209 }
210 if (!strncmp(argv[i], "--head=", 7)) {
211 cgit_query_head = xstrdup(argv[i]+7);
212 cgit_query_has_symref = 1;
213 }
214 if (!strncmp(argv[i], "--sha1=", 7)) {
215 cgit_query_sha1 = xstrdup(argv[i]+7);
216 cgit_query_has_sha1 = 1;
217 }
218 if (!strncmp(argv[i], "--ofs=", 6)) {
219 cgit_query_ofs = atoi(argv[i]+6);
220 }
221 }
222}
223
224int main(int argc, const char **argv)
225{
226 struct cacheitem item;
227 const char *cgit_config_env = getenv("CGIT_CONFIG");
228
229 htmlfd = STDOUT_FILENO;
230 item.st.st_mtime = time(NULL);
231 cgit_repolist.length = 0;
232 cgit_repolist.count = 0;
233 cgit_repolist.repos = NULL;
234
235 cgit_read_config(cgit_config_env ? cgit_config_env : CGIT_CONFIG,
236 cgit_global_config_cb);
237 cgit_repo = NULL;
238 if (getenv("SCRIPT_NAME"))
239 cgit_script_name = xstrdup(getenv("SCRIPT_NAME"));
240 if (getenv("QUERY_STRING"))
241 cgit_querystring = xstrdup(getenv("QUERY_STRING"));
242 cgit_parse_args(argc, argv);
243 cgit_parse_query(cgit_querystring, cgit_querystring_cb);
244 if (!cgit_prepare_cache(&item))
245 return 0;
246 if (cgit_nocache) {
247 cgit_fill_cache(&item, 0);
248 } else {
249 cgit_check_cache(&item);
250 cgit_print_cache(&item);
251 }
252 return 0;
253}