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 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_sha1, 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_sha1, cgit_query_sha2);
107 break;
108 default:
109 cgit_print_error("Invalid request");
110 }
111 cgit_print_docend();
112}
113
114static void cgit_fill_cache(struct cacheitem *item, int use_cache)
115{
116 static char buf[PATH_MAX];
117 int stdout2;
118
119 getcwd(buf, sizeof(buf));
120 item->st.st_mtime = time(NULL);
121
122 if (use_cache) {
123 stdout2 = chk_positive(dup(STDOUT_FILENO),
124 "Preserving STDOUT");
125 chk_zero(close(STDOUT_FILENO), "Closing STDOUT");
126 chk_positive(dup2(item->fd, STDOUT_FILENO), "Dup2(cachefile)");
127 }
128
129 if (cgit_repo)
130 cgit_print_repo_page(item);
131 else
132 cgit_print_repolist(item);
133
134 if (use_cache) {
135 chk_zero(close(STDOUT_FILENO), "Close redirected STDOUT");
136 chk_positive(dup2(stdout2, STDOUT_FILENO),
137 "Restoring original STDOUT");
138 chk_zero(close(stdout2), "Closing temporary STDOUT");
139 }
140
141 chdir(buf);
142}
143
144static void cgit_check_cache(struct cacheitem *item)
145{
146 int i = 0;
147
148 top:
149 if (++i > cgit_max_lock_attempts) {
150 die("cgit_refresh_cache: unable to lock %s: %s",
151 item->name, strerror(errno));
152 }
153 if (!cache_exist(item)) {
154 if (!cache_lock(item)) {
155 sleep(1);
156 goto top;
157 }
158 if (!cache_exist(item)) {
159 cgit_fill_cache(item, 1);
160 cache_unlock(item);
161 } else {
162 cache_cancel_lock(item);
163 }
164 } else if (cache_expired(item) && cache_lock(item)) {
165 if (cache_expired(item)) {
166 cgit_fill_cache(item, 1);
167 cache_unlock(item);
168 } else {
169 cache_cancel_lock(item);
170 }
171 }
172}
173
174static void cgit_print_cache(struct cacheitem *item)
175{
176 static char buf[4096];
177 ssize_t i;
178
179 int fd = open(item->name, O_RDONLY);
180 if (fd<0)
181 die("Unable to open cached file %s", item->name);
182
183 while((i=read(fd, buf, sizeof(buf))) > 0)
184 write(STDOUT_FILENO, buf, i);
185
186 close(fd);
187}
188
189static void cgit_parse_args(int argc, const char **argv)
190{
191 int i;
192
193 for (i = 1; i < argc; i++) {
194 if (!strncmp(argv[i], "--cache=", 8)) {
195 cgit_cache_root = xstrdup(argv[i]+8);
196 }
197 if (!strcmp(argv[i], "--nocache")) {
198 cgit_nocache = 1;
199 }
200 if (!strncmp(argv[i], "--query=", 8)) {
201 cgit_querystring = xstrdup(argv[i]+8);
202 }
203 if (!strncmp(argv[i], "--repo=", 7)) {
204 cgit_query_repo = xstrdup(argv[i]+7);
205 }
206 if (!strncmp(argv[i], "--page=", 7)) {
207 cgit_query_page = xstrdup(argv[i]+7);
208 }
209 if (!strncmp(argv[i], "--head=", 7)) {
210 cgit_query_head = xstrdup(argv[i]+7);
211 cgit_query_has_symref = 1;
212 }
213 if (!strncmp(argv[i], "--sha1=", 7)) {
214 cgit_query_sha1 = xstrdup(argv[i]+7);
215 cgit_query_has_sha1 = 1;
216 }
217 if (!strncmp(argv[i], "--ofs=", 6)) {
218 cgit_query_ofs = atoi(argv[i]+6);
219 }
220 }
221}
222
223int main(int argc, const char **argv)
224{
225 struct cacheitem item;
226 const char *cgit_config_env = getenv("CGIT_CONFIG");
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_env ? cgit_config_env : CGIT_CONFIG,
235 cgit_global_config_cb);
236 cgit_repo = NULL;
237 if (getenv("SCRIPT_NAME"))
238 cgit_script_name = xstrdup(getenv("SCRIPT_NAME"));
239 if (getenv("QUERY_STRING"))
240 cgit_querystring = xstrdup(getenv("QUERY_STRING"));
241 cgit_parse_args(argc, argv);
242 cgit_parse_query(cgit_querystring, cgit_querystring_cb);
243 if (!cgit_prepare_cache(&item))
244 return 0;
245 if (cgit_nocache) {
246 cgit_fill_cache(&item, 0);
247 } else {
248 cgit_check_cache(&item);
249 cgit_print_cache(&item);
250 }
251 return 0;
252}