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