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 (!cgit_query_head)
69 cgit_query_head = cgit_repo->defbranch;
70
71 if (chdir(cgit_repo->path)) {
72 title = fmt("%s - %s", cgit_root_title, "Bad request");
73 cgit_print_docstart(title, item);
74 cgit_print_pageheader(title, 0);
75 cgit_print_error(fmt("Unable to scan repository: %s",
76 strerror(errno)));
77 cgit_print_docend();
78 return;
79 }
80
81 title = fmt("%s - %s", cgit_repo->name, cgit_repo->desc);
82 show_search = 0;
83 setenv("GIT_DIR", cgit_repo->path, 1);
84
85 if (cgit_query_page) {
86 if (cgit_repo->snapshots && !strcmp(cgit_query_page, "snapshot")) {
87 cgit_print_snapshot(item, cgit_query_sha1, "zip",
88 cgit_repo->url, cgit_query_name);
89 return;
90 }
91 if (!strcmp(cgit_query_page, "blob")) {
92 cgit_print_blob(item, cgit_query_sha1, cgit_query_path);
93 return;
94 }
95 }
96
97 if (cgit_query_page && !strcmp(cgit_query_page, "log"))
98 show_search = 1;
99
100 cgit_print_docstart(title, item);
101
102
103 if (!cgit_query_page) {
104 cgit_print_pageheader("summary", show_search);
105 cgit_print_summary();
106 cgit_print_docend();
107 return;
108 }
109
110 cgit_print_pageheader(cgit_query_page, show_search);
111
112 if (!strcmp(cgit_query_page, "log")) {
113 cgit_print_log(cgit_query_head, cgit_query_ofs,
114 cgit_max_commit_count, cgit_query_search,
115 cgit_query_path);
116 } else if (!strcmp(cgit_query_page, "tree")) {
117 cgit_print_tree(cgit_query_head, cgit_query_sha1, cgit_query_path);
118 } else if (!strcmp(cgit_query_page, "commit")) {
119 cgit_print_commit(cgit_query_sha1);
120 } else if (!strcmp(cgit_query_page, "view")) {
121 cgit_print_view(cgit_query_sha1, cgit_query_path);
122 } else if (!strcmp(cgit_query_page, "diff")) {
123 cgit_print_diff(cgit_query_sha1, cgit_query_sha2, cgit_query_path);
124 } else {
125 cgit_print_error("Invalid request");
126 }
127 cgit_print_docend();
128}
129
130static void cgit_fill_cache(struct cacheitem *item, int use_cache)
131{
132 static char buf[PATH_MAX];
133 int stdout2;
134
135 getcwd(buf, sizeof(buf));
136 item->st.st_mtime = time(NULL);
137
138 if (use_cache) {
139 stdout2 = chk_positive(dup(STDOUT_FILENO),
140 "Preserving STDOUT");
141 chk_zero(close(STDOUT_FILENO), "Closing STDOUT");
142 chk_positive(dup2(item->fd, STDOUT_FILENO), "Dup2(cachefile)");
143 }
144
145 if (cgit_query_repo)
146 cgit_print_repo_page(item);
147 else
148 cgit_print_repolist(item);
149
150 if (use_cache) {
151 chk_zero(close(STDOUT_FILENO), "Close redirected STDOUT");
152 chk_positive(dup2(stdout2, STDOUT_FILENO),
153 "Restoring original STDOUT");
154 chk_zero(close(stdout2), "Closing temporary STDOUT");
155 }
156
157 chdir(buf);
158}
159
160static void cgit_check_cache(struct cacheitem *item)
161{
162 int i = 0;
163
164 top:
165 if (++i > cgit_max_lock_attempts) {
166 die("cgit_refresh_cache: unable to lock %s: %s",
167 item->name, strerror(errno));
168 }
169 if (!cache_exist(item)) {
170 if (!cache_lock(item)) {
171 sleep(1);
172 goto top;
173 }
174 if (!cache_exist(item)) {
175 cgit_fill_cache(item, 1);
176 cache_unlock(item);
177 } else {
178 cache_cancel_lock(item);
179 }
180 } else if (cache_expired(item) && cache_lock(item)) {
181 if (cache_expired(item)) {
182 cgit_fill_cache(item, 1);
183 cache_unlock(item);
184 } else {
185 cache_cancel_lock(item);
186 }
187 }
188}
189
190static void cgit_print_cache(struct cacheitem *item)
191{
192 static char buf[4096];
193 ssize_t i;
194
195 int fd = open(item->name, O_RDONLY);
196 if (fd<0)
197 die("Unable to open cached file %s", item->name);
198
199 while((i=read(fd, buf, sizeof(buf))) > 0)
200 write(STDOUT_FILENO, buf, i);
201
202 close(fd);
203}
204
205static void cgit_parse_args(int argc, const char **argv)
206{
207 int i;
208
209 for (i = 1; i < argc; i++) {
210 if (!strncmp(argv[i], "--cache=", 8)) {
211 cgit_cache_root = xstrdup(argv[i]+8);
212 }
213 if (!strcmp(argv[i], "--nocache")) {
214 cgit_nocache = 1;
215 }
216 if (!strncmp(argv[i], "--query=", 8)) {
217 cgit_querystring = xstrdup(argv[i]+8);
218 }
219 if (!strncmp(argv[i], "--repo=", 7)) {
220 cgit_query_repo = xstrdup(argv[i]+7);
221 }
222 if (!strncmp(argv[i], "--page=", 7)) {
223 cgit_query_page = xstrdup(argv[i]+7);
224 }
225 if (!strncmp(argv[i], "--head=", 7)) {
226 cgit_query_head = xstrdup(argv[i]+7);
227 cgit_query_has_symref = 1;
228 }
229 if (!strncmp(argv[i], "--sha1=", 7)) {
230 cgit_query_sha1 = xstrdup(argv[i]+7);
231 cgit_query_has_sha1 = 1;
232 }
233 if (!strncmp(argv[i], "--ofs=", 6)) {
234 cgit_query_ofs = atoi(argv[i]+6);
235 }
236 }
237}
238
239int main(int argc, const char **argv)
240{
241 struct cacheitem item;
242
243 htmlfd = STDOUT_FILENO;
244 item.st.st_mtime = time(NULL);
245 cgit_repolist.length = 0;
246 cgit_repolist.count = 0;
247 cgit_repolist.repos = NULL;
248
249 cgit_read_config(CGIT_CONFIG, cgit_global_config_cb);
250 if (getenv("SCRIPT_NAME"))
251 cgit_script_name = xstrdup(getenv("SCRIPT_NAME"));
252 if (getenv("QUERY_STRING"))
253 cgit_querystring = xstrdup(getenv("QUERY_STRING"));
254 cgit_parse_args(argc, argv);
255 cgit_parse_query(cgit_querystring, cgit_querystring_cb);
256 if (!cgit_prepare_cache(&item))
257 return 0;
258 if (cgit_nocache) {
259 cgit_fill_cache(&item, 0);
260 } else {
261 cgit_check_cache(&item);
262 cgit_print_cache(&item);
263 }
264 return 0;
265}