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 int cgit_prepare_cache(struct cacheitem *item)
15{
16 if (!cgit_repo && cgit_query_repo) {
17 char *title = fmt("%s - %s", cgit_root_title, "Bad request");
18 cgit_print_docstart(title, item);
19 cgit_print_pageheader(title, 0);
20 cgit_print_error(fmt("Unknown repo: %s", cgit_query_repo));
21 cgit_print_docend();
22 return 0;
23 }
24
25 if (!cgit_repo) {
26 item->name = xstrdup(fmt("%s/index.html", cgit_cache_root));
27 item->ttl = cgit_cache_root_ttl;
28 return 1;
29 }
30
31 if (!cgit_cmd) {
32 item->name = xstrdup(fmt("%s/%s/index.html", cgit_cache_root,
33 cache_safe_filename(cgit_repo->url)));
34 item->ttl = cgit_cache_repo_ttl;
35 } else {
36 item->name = xstrdup(fmt("%s/%s/%s/%s.html", cgit_cache_root,
37 cache_safe_filename(cgit_repo->url), cgit_query_page,
38 cache_safe_filename(cgit_querystring)));
39 if (cgit_query_has_symref)
40 item->ttl = cgit_cache_dynamic_ttl;
41 else if (cgit_query_has_sha1)
42 item->ttl = cgit_cache_static_ttl;
43 else
44 item->ttl = cgit_cache_repo_ttl;
45 }
46 return 1;
47}
48
49static void cgit_print_repo_page(struct cacheitem *item)
50{
51 char *title;
52 int show_search;
53
54 if (!cgit_query_head)
55 cgit_query_head = cgit_repo->defbranch;
56
57 if (chdir(cgit_repo->path)) {
58 title = fmt("%s - %s", cgit_root_title, "Bad request");
59 cgit_print_docstart(title, item);
60 cgit_print_pageheader(title, 0);
61 cgit_print_error(fmt("Unable to scan repository: %s",
62 strerror(errno)));
63 cgit_print_docend();
64 return;
65 }
66
67 title = fmt("%s - %s", cgit_repo->name, cgit_repo->desc);
68 show_search = 0;
69 setenv("GIT_DIR", cgit_repo->path, 1);
70
71 if ((cgit_cmd == CMD_SNAPSHOT) && cgit_repo->snapshots) {
72 cgit_print_snapshot(item, cgit_query_sha1, "zip",
73 cgit_repo->url, cgit_query_name);
74 return;
75 }
76
77 if (cgit_cmd == CMD_BLOB) {
78 cgit_print_blob(item, cgit_query_sha1, cgit_query_path);
79 return;
80 }
81
82 show_search = (cgit_cmd == CMD_LOG);
83 cgit_print_docstart(title, item);
84 if (!cgit_cmd) {
85 cgit_print_pageheader("summary", show_search);
86 cgit_print_summary();
87 cgit_print_docend();
88 return;
89 }
90
91 cgit_print_pageheader(cgit_query_page, show_search);
92
93 switch(cgit_cmd) {
94 case CMD_LOG:
95 cgit_print_log(cgit_query_head, cgit_query_ofs,
96 cgit_max_commit_count, cgit_query_search,
97 cgit_query_path, 1);
98 break;
99 case CMD_TREE:
100 cgit_print_tree(cgit_query_sha1, cgit_query_path);
101 break;
102 case CMD_COMMIT:
103 cgit_print_commit(cgit_query_sha1);
104 break;
105 case CMD_DIFF:
106 cgit_print_diff(cgit_query_head, cgit_query_sha1, cgit_query_sha2,
107 cgit_query_path);
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
228 htmlfd = STDOUT_FILENO;
229 item.st.st_mtime = time(NULL);
230 cgit_repolist.length = 0;
231 cgit_repolist.count = 0;
232 cgit_repolist.repos = NULL;
233
234 cgit_read_config(CGIT_CONFIG, cgit_global_config_cb);
235 cgit_repo = NULL;
236 if (getenv("SCRIPT_NAME"))
237 cgit_script_name = xstrdup(getenv("SCRIPT_NAME"));
238 if (getenv("QUERY_STRING"))
239 cgit_querystring = xstrdup(getenv("QUERY_STRING"));
240 cgit_parse_args(argc, argv);
241 cgit_parse_query(cgit_querystring, cgit_querystring_cb);
242 if (!cgit_prepare_cache(&item))
243 return 0;
244 if (cgit_nocache) {
245 cgit_fill_cache(&item, 0);
246 } else {
247 cgit_check_cache(&item);
248 cgit_print_cache(&item);
249 }
250 return 0;
251}