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_query_repo) {
17 item->name = xstrdup(fmt("%s/index.html", cgit_cache_root));
18 item->ttl = cgit_cache_root_ttl;
19 return 1;
20 }
21 cgit_repo = cgit_get_repoinfo(cgit_query_repo);
22 if (!cgit_repo) {
23 char *title = fmt("%s - %s", cgit_root_title, "Bad request");
24 cgit_print_docstart(title, item);
25 cgit_print_pageheader(title, 0);
26 cgit_print_error(fmt("Unknown repo: %s", cgit_query_repo));
27 cgit_print_docend();
28 return 0;
29 }
30
31 if (!cgit_query_page) {
32 item->name = xstrdup(fmt("%s/%s/index.html", cgit_cache_root,
33 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 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_query_page) {
72 if (cgit_repo->snapshots && !strcmp(cgit_query_page, "snapshot")) {
73 cgit_print_snapshot(item, cgit_query_sha1, "zip",
74 cgit_repo->url, cgit_query_name);
75 return;
76 }
77 if (!strcmp(cgit_query_page, "blob")) {
78 cgit_print_blob(item, cgit_query_sha1, cgit_query_path);
79 return;
80 }
81 }
82
83 if (cgit_query_page && !strcmp(cgit_query_page, "log"))
84 show_search = 1;
85
86 cgit_print_docstart(title, item);
87
88
89 if (!cgit_query_page) {
90 cgit_print_pageheader("summary", show_search);
91 cgit_print_summary();
92 cgit_print_docend();
93 return;
94 }
95
96 cgit_print_pageheader(cgit_query_page, show_search);
97
98 if (!strcmp(cgit_query_page, "log")) {
99 cgit_print_log(cgit_query_head, cgit_query_ofs,
100 cgit_max_commit_count, cgit_query_search,
101 cgit_query_path);
102 } else if (!strcmp(cgit_query_page, "tree")) {
103 cgit_print_tree(cgit_query_head, cgit_query_sha1, cgit_query_path);
104 } else if (!strcmp(cgit_query_page, "commit")) {
105 cgit_print_commit(cgit_query_head);
106 } else if (!strcmp(cgit_query_page, "view")) {
107 cgit_print_view(cgit_query_sha1, cgit_query_path);
108 } else if (!strcmp(cgit_query_page, "diff")) {
109 cgit_print_diff(cgit_query_head, cgit_query_sha1, cgit_query_sha2,
110 cgit_query_path);
111 } else {
112 cgit_print_error("Invalid request");
113 }
114 cgit_print_docend();
115}
116
117static void cgit_fill_cache(struct cacheitem *item, int use_cache)
118{
119 static char buf[PATH_MAX];
120 int stdout2;
121
122 getcwd(buf, sizeof(buf));
123 item->st.st_mtime = time(NULL);
124
125 if (use_cache) {
126 stdout2 = chk_positive(dup(STDOUT_FILENO),
127 "Preserving STDOUT");
128 chk_zero(close(STDOUT_FILENO), "Closing STDOUT");
129 chk_positive(dup2(item->fd, STDOUT_FILENO), "Dup2(cachefile)");
130 }
131
132 if (cgit_query_repo)
133 cgit_print_repo_page(item);
134 else
135 cgit_print_repolist(item);
136
137 if (use_cache) {
138 chk_zero(close(STDOUT_FILENO), "Close redirected STDOUT");
139 chk_positive(dup2(stdout2, STDOUT_FILENO),
140 "Restoring original STDOUT");
141 chk_zero(close(stdout2), "Closing temporary STDOUT");
142 }
143
144 chdir(buf);
145}
146
147static void cgit_check_cache(struct cacheitem *item)
148{
149 int i = 0;
150
151 top:
152 if (++i > cgit_max_lock_attempts) {
153 die("cgit_refresh_cache: unable to lock %s: %s",
154 item->name, strerror(errno));
155 }
156 if (!cache_exist(item)) {
157 if (!cache_lock(item)) {
158 sleep(1);
159 goto top;
160 }
161 if (!cache_exist(item)) {
162 cgit_fill_cache(item, 1);
163 cache_unlock(item);
164 } else {
165 cache_cancel_lock(item);
166 }
167 } else if (cache_expired(item) && cache_lock(item)) {
168 if (cache_expired(item)) {
169 cgit_fill_cache(item, 1);
170 cache_unlock(item);
171 } else {
172 cache_cancel_lock(item);
173 }
174 }
175}
176
177static void cgit_print_cache(struct cacheitem *item)
178{
179 static char buf[4096];
180 ssize_t i;
181
182 int fd = open(item->name, O_RDONLY);
183 if (fd<0)
184 die("Unable to open cached file %s", item->name);
185
186 while((i=read(fd, buf, sizeof(buf))) > 0)
187 write(STDOUT_FILENO, buf, i);
188
189 close(fd);
190}
191
192static void cgit_parse_args(int argc, const char **argv)
193{
194 int i;
195
196 for (i = 1; i < argc; i++) {
197 if (!strncmp(argv[i], "--cache=", 8)) {
198 cgit_cache_root = xstrdup(argv[i]+8);
199 }
200 if (!strcmp(argv[i], "--nocache")) {
201 cgit_nocache = 1;
202 }
203 if (!strncmp(argv[i], "--query=", 8)) {
204 cgit_querystring = xstrdup(argv[i]+8);
205 }
206 if (!strncmp(argv[i], "--repo=", 7)) {
207 cgit_query_repo = xstrdup(argv[i]+7);
208 }
209 if (!strncmp(argv[i], "--page=", 7)) {
210 cgit_query_page = xstrdup(argv[i]+7);
211 }
212 if (!strncmp(argv[i], "--head=", 7)) {
213 cgit_query_head = xstrdup(argv[i]+7);
214 cgit_query_has_symref = 1;
215 }
216 if (!strncmp(argv[i], "--sha1=", 7)) {
217 cgit_query_sha1 = xstrdup(argv[i]+7);
218 cgit_query_has_sha1 = 1;
219 }
220 if (!strncmp(argv[i], "--ofs=", 6)) {
221 cgit_query_ofs = atoi(argv[i]+6);
222 }
223 }
224}
225
226int main(int argc, const char **argv)
227{
228 struct cacheitem item;
229
230 htmlfd = STDOUT_FILENO;
231 item.st.st_mtime = time(NULL);
232 cgit_repolist.length = 0;
233 cgit_repolist.count = 0;
234 cgit_repolist.repos = NULL;
235
236 cgit_read_config(CGIT_CONFIG, cgit_global_config_cb);
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}