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.html", cgit_cache_root,
30 cache_safe_filename(cgit_repo->url)));
31 item->ttl = cgit_cache_repo_ttl;
32 } else {
33 item->name = xstrdup(fmt("%s/%s/%s/%s.html", cgit_cache_root,
34 cache_safe_filename(cgit_repo->url), cgit_query_page,
35 cache_safe_filename(cgit_querystring)));
36 if (cgit_query_has_symref)
37 item->ttl = cgit_cache_dynamic_ttl;
38 else if (cgit_query_has_sha1)
39 item->ttl = cgit_cache_static_ttl;
40 else
41 item->ttl = cgit_cache_repo_ttl;
42 }
43 return 1;
44}
45
46static void cgit_print_repo_page(struct cacheitem *item)
47{
48 char *title;
49 int show_search;
50
51 if (!cgit_query_head)
52 cgit_query_head = cgit_repo->defbranch;
53
54 if (chdir(cgit_repo->path)) {
55 title = fmt("%s - %s", cgit_root_title, "Bad request");
56 cgit_print_docstart(title, item);
57 cgit_print_pageheader(title, 0);
58 cgit_print_error(fmt("Unable to scan repository: %s",
59 strerror(errno)));
60 cgit_print_docend();
61 return;
62 }
63
64 title = fmt("%s - %s", cgit_repo->name, cgit_repo->desc);
65 show_search = 0;
66 setenv("GIT_DIR", cgit_repo->path, 1);
67
68 if ((cgit_cmd == CMD_SNAPSHOT) && cgit_repo->snapshots) {
69 cgit_print_snapshot(item, cgit_query_sha1, "zip",
70 cgit_repo->url, cgit_query_name);
71 return;
72 }
73
74 if (cgit_cmd == CMD_BLOB) {
75 cgit_print_blob(item, cgit_query_sha1, cgit_query_path);
76 return;
77 }
78
79 show_search = (cgit_cmd == CMD_LOG);
80 cgit_print_docstart(title, item);
81 if (!cgit_cmd) {
82 cgit_print_pageheader("summary", show_search);
83 cgit_print_summary();
84 cgit_print_docend();
85 return;
86 }
87
88 cgit_print_pageheader(cgit_query_page, show_search);
89
90 switch(cgit_cmd) {
91 case CMD_LOG:
92 cgit_print_log(cgit_query_sha1, cgit_query_ofs,
93 cgit_max_commit_count, cgit_query_search,
94 cgit_query_path, 1);
95 break;
96 case CMD_TREE:
97 cgit_print_tree(cgit_query_sha1, cgit_query_path);
98 break;
99 case CMD_COMMIT:
100 cgit_print_commit(cgit_query_sha1);
101 break;
102 case CMD_DIFF:
103 cgit_print_diff(cgit_query_sha1, cgit_query_sha2);
104 break;
105 default:
106 cgit_print_error("Invalid request");
107 }
108 cgit_print_docend();
109}
110
111static void cgit_fill_cache(struct cacheitem *item, int use_cache)
112{
113 static char buf[PATH_MAX];
114 int stdout2;
115
116 getcwd(buf, sizeof(buf));
117 item->st.st_mtime = time(NULL);
118
119 if (use_cache) {
120 stdout2 = chk_positive(dup(STDOUT_FILENO),
121 "Preserving STDOUT");
122 chk_zero(close(STDOUT_FILENO), "Closing STDOUT");
123 chk_positive(dup2(item->fd, STDOUT_FILENO), "Dup2(cachefile)");
124 }
125
126 if (cgit_repo)
127 cgit_print_repo_page(item);
128 else
129 cgit_print_repolist(item);
130
131 if (use_cache) {
132 chk_zero(close(STDOUT_FILENO), "Close redirected STDOUT");
133 chk_positive(dup2(stdout2, STDOUT_FILENO),
134 "Restoring original STDOUT");
135 chk_zero(close(stdout2), "Closing temporary STDOUT");
136 }
137
138 chdir(buf);
139}
140
141static void cgit_check_cache(struct cacheitem *item)
142{
143 int i = 0;
144
145 top:
146 if (++i > cgit_max_lock_attempts) {
147 die("cgit_refresh_cache: unable to lock %s: %s",
148 item->name, strerror(errno));
149 }
150 if (!cache_exist(item)) {
151 if (!cache_lock(item)) {
152 sleep(1);
153 goto top;
154 }
155 if (!cache_exist(item)) {
156 cgit_fill_cache(item, 1);
157 cache_unlock(item);
158 } else {
159 cache_cancel_lock(item);
160 }
161 } else if (cache_expired(item) && cache_lock(item)) {
162 if (cache_expired(item)) {
163 cgit_fill_cache(item, 1);
164 cache_unlock(item);
165 } else {
166 cache_cancel_lock(item);
167 }
168 }
169}
170
171static void cgit_print_cache(struct cacheitem *item)
172{
173 static char buf[4096];
174 ssize_t i;
175
176 int fd = open(item->name, O_RDONLY);
177 if (fd<0)
178 die("Unable to open cached file %s", item->name);
179
180 while((i=read(fd, buf, sizeof(buf))) > 0)
181 write(STDOUT_FILENO, buf, i);
182
183 close(fd);
184}
185
186static void cgit_parse_args(int argc, const char **argv)
187{
188 int i;
189
190 for (i = 1; i < argc; i++) {
191 if (!strncmp(argv[i], "--cache=", 8)) {
192 cgit_cache_root = xstrdup(argv[i]+8);
193 }
194 if (!strcmp(argv[i], "--nocache")) {
195 cgit_nocache = 1;
196 }
197 if (!strncmp(argv[i], "--query=", 8)) {
198 cgit_querystring = xstrdup(argv[i]+8);
199 }
200 if (!strncmp(argv[i], "--repo=", 7)) {
201 cgit_query_repo = xstrdup(argv[i]+7);
202 }
203 if (!strncmp(argv[i], "--page=", 7)) {
204 cgit_query_page = xstrdup(argv[i]+7);
205 }
206 if (!strncmp(argv[i], "--head=", 7)) {
207 cgit_query_head = xstrdup(argv[i]+7);
208 cgit_query_has_symref = 1;
209 }
210 if (!strncmp(argv[i], "--sha1=", 7)) {
211 cgit_query_sha1 = xstrdup(argv[i]+7);
212 cgit_query_has_sha1 = 1;
213 }
214 if (!strncmp(argv[i], "--ofs=", 6)) {
215 cgit_query_ofs = atoi(argv[i]+6);
216 }
217 }
218}
219
220int main(int argc, const char **argv)
221{
222 struct cacheitem item;
223
224 htmlfd = STDOUT_FILENO;
225 item.st.st_mtime = time(NULL);
226 cgit_repolist.length = 0;
227 cgit_repolist.count = 0;
228 cgit_repolist.repos = NULL;
229
230 cgit_read_config(CGIT_CONFIG, cgit_global_config_cb);
231 cgit_repo = NULL;
232 if (getenv("SCRIPT_NAME"))
233 cgit_script_name = xstrdup(getenv("SCRIPT_NAME"));
234 if (getenv("QUERY_STRING"))
235 cgit_querystring = xstrdup(getenv("QUERY_STRING"));
236 cgit_parse_args(argc, argv);
237 cgit_parse_query(cgit_querystring, cgit_querystring_cb);
238 if (!cgit_prepare_cache(&item))
239 return 0;
240 if (cgit_nocache) {
241 cgit_fill_cache(&item, 0);
242 } else {
243 cgit_check_cache(&item);
244 cgit_print_cache(&item);
245 }
246 return 0;
247}