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