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_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_TAG:
107 cgit_print_tag(cgit_query_sha1);
108 break;
109 case CMD_DIFF:
110 cgit_print_diff(cgit_query_sha1, cgit_query_sha2);
111 break;
112 default:
113 cgit_print_error("Invalid request");
114 }
115 cgit_print_docend();
116}
117
118static void cgit_fill_cache(struct cacheitem *item, int use_cache)
119{
120 static char buf[PATH_MAX];
121 int stdout2;
122
123 getcwd(buf, sizeof(buf));
124 item->st.st_mtime = time(NULL);
125
126 if (use_cache) {
127 stdout2 = chk_positive(dup(STDOUT_FILENO),
128 "Preserving STDOUT");
129 chk_zero(close(STDOUT_FILENO), "Closing STDOUT");
130 chk_positive(dup2(item->fd, STDOUT_FILENO), "Dup2(cachefile)");
131 }
132
133 if (cgit_repo)
134 cgit_print_repo_page(item);
135 else
136 cgit_print_repolist(item);
137
138 if (use_cache) {
139 chk_zero(close(STDOUT_FILENO), "Close redirected STDOUT");
140 chk_positive(dup2(stdout2, STDOUT_FILENO),
141 "Restoring original STDOUT");
142 chk_zero(close(stdout2), "Closing temporary STDOUT");
143 }
144
145 chdir(buf);
146}
147
148static void cgit_check_cache(struct cacheitem *item)
149{
150 int i = 0;
151
152 top:
153 if (++i > cgit_max_lock_attempts) {
154 die("cgit_refresh_cache: unable to lock %s: %s",
155 item->name, strerror(errno));
156 }
157 if (!cache_exist(item)) {
158 if (!cache_lock(item)) {
159 sleep(1);
160 goto top;
161 }
162 if (!cache_exist(item)) {
163 cgit_fill_cache(item, 1);
164 cache_unlock(item);
165 } else {
166 cache_cancel_lock(item);
167 }
168 } else if (cache_expired(item) && cache_lock(item)) {
169 if (cache_expired(item)) {
170 cgit_fill_cache(item, 1);
171 cache_unlock(item);
172 } else {
173 cache_cancel_lock(item);
174 }
175 }
176}
177
178static void cgit_print_cache(struct cacheitem *item)
179{
180 static char buf[4096];
181 ssize_t i;
182
183 int fd = open(item->name, O_RDONLY);
184 if (fd<0)
185 die("Unable to open cached file %s", item->name);
186
187 while((i=read(fd, buf, sizeof(buf))) > 0)
188 write(STDOUT_FILENO, buf, i);
189
190 close(fd);
191}
192
193static void cgit_parse_args(int argc, const char **argv)
194{
195 int i;
196
197 for (i = 1; i < argc; i++) {
198 if (!strncmp(argv[i], "--cache=", 8)) {
199 cgit_cache_root = xstrdup(argv[i]+8);
200 }
201 if (!strcmp(argv[i], "--nocache")) {
202 cgit_nocache = 1;
203 }
204 if (!strncmp(argv[i], "--query=", 8)) {
205 cgit_querystring = xstrdup(argv[i]+8);
206 }
207 if (!strncmp(argv[i], "--repo=", 7)) {
208 cgit_query_repo = xstrdup(argv[i]+7);
209 }
210 if (!strncmp(argv[i], "--page=", 7)) {
211 cgit_query_page = xstrdup(argv[i]+7);
212 }
213 if (!strncmp(argv[i], "--head=", 7)) {
214 cgit_query_head = xstrdup(argv[i]+7);
215 cgit_query_has_symref = 1;
216 }
217 if (!strncmp(argv[i], "--sha1=", 7)) {
218 cgit_query_sha1 = xstrdup(argv[i]+7);
219 cgit_query_has_sha1 = 1;
220 }
221 if (!strncmp(argv[i], "--ofs=", 6)) {
222 cgit_query_ofs = atoi(argv[i]+6);
223 }
224 }
225}
226
227int main(int argc, const char **argv)
228{
229 struct cacheitem item;
230 const char *cgit_config_env = getenv("CGIT_CONFIG");
231
232 htmlfd = STDOUT_FILENO;
233 item.st.st_mtime = time(NULL);
234 cgit_repolist.length = 0;
235 cgit_repolist.count = 0;
236 cgit_repolist.repos = NULL;
237
238 cgit_read_config(cgit_config_env ? cgit_config_env : CGIT_CONFIG,
239 cgit_global_config_cb);
240 cgit_repo = NULL;
241 if (getenv("SCRIPT_NAME"))
242 cgit_script_name = xstrdup(getenv("SCRIPT_NAME"));
243 if (getenv("QUERY_STRING"))
244 cgit_querystring = xstrdup(getenv("QUERY_STRING"));
245 cgit_parse_args(argc, argv);
246 cgit_parse_query(cgit_querystring, cgit_querystring_cb);
247 if (!cgit_prepare_cache(&item))
248 return 0;
249 if (cgit_nocache) {
250 cgit_fill_cache(&item, 0);
251 } else {
252 cgit_check_cache(&item);
253 cgit_print_cache(&item);
254 }
255 return 0;
256}