]> gitweb.ps.run Git - ps-cgit/blob - cgit.c
Improve initialization of git directory
[ps-cgit] / cgit.c
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
11 static int cgit_prepare_cache(struct cacheitem *item)
12 {
13         if (!ctx.repo && ctx.qry.repo) {
14                 char *title = fmt("%s - %s", ctx.cfg.root_title, "Bad request");
15                 cgit_print_docstart(title, item);
16                 cgit_print_pageheader(title, 0);
17                 cgit_print_error(fmt("Unknown repo: %s", ctx.qry.repo));
18                 cgit_print_docend();
19                 return 0;
20         }
21
22         if (!ctx.repo) {
23                 item->name = xstrdup(fmt("%s/index.html", ctx.cfg.cache_root));
24                 item->ttl = ctx.cfg.cache_root_ttl;
25                 return 1;
26         }
27
28         if (!cgit_cmd) {
29                 item->name = xstrdup(fmt("%s/%s/index.%s.html", ctx.cfg.cache_root,
30                                          cache_safe_filename(ctx.repo->url),
31                                          cache_safe_filename(ctx.qry.raw)));
32                 item->ttl = ctx.cfg.cache_repo_ttl;
33         } else {
34                 item->name = xstrdup(fmt("%s/%s/%s/%s.html", ctx.cfg.cache_root,
35                                          cache_safe_filename(ctx.repo->url),
36                                          ctx.qry.page,
37                                          cache_safe_filename(ctx.qry.raw)));
38                 if (ctx.qry.has_symref)
39                         item->ttl = ctx.cfg.cache_dynamic_ttl;
40                 else if (ctx.qry.has_sha1)
41                         item->ttl = ctx.cfg.cache_static_ttl;
42                 else
43                         item->ttl = ctx.cfg.cache_repo_ttl;
44         }
45         return 1;
46 }
47
48 struct refmatch {
49         char *req_ref;
50         char *first_ref;
51         int match;
52 };
53
54 int find_current_ref(const char *refname, const unsigned char *sha1,
55                      int flags, void *cb_data)
56 {
57         struct refmatch *info;
58
59         info = (struct refmatch *)cb_data;
60         if (!strcmp(refname, info->req_ref))
61                 info->match = 1;
62         if (!info->first_ref)
63                 info->first_ref = xstrdup(refname);
64         return info->match;
65 }
66
67 char *find_default_branch(struct cgit_repo *repo)
68 {
69         struct refmatch info;
70
71         info.req_ref = repo->defbranch;
72         info.first_ref = NULL;
73         info.match = 0;
74         for_each_branch_ref(find_current_ref, &info);
75         if (info.match)
76                 return info.req_ref;
77         else
78                 return info.first_ref;
79 }
80
81 static void cgit_print_repo_page(struct cacheitem *item)
82 {
83         char *title, *tmp;
84         int show_search;
85         unsigned char sha1[20];
86         int nongit = 0;
87
88         setenv("GIT_DIR", ctx.repo->path, 1);
89         setup_git_directory_gently(&nongit);
90         if (nongit) {
91                 title = fmt("%s - %s", ctx.cfg.root_title, "config error");
92                 tmp = fmt("Not a git repository: '%s'", ctx.repo->path);
93                 ctx.repo = NULL;
94                 cgit_print_docstart(title, item);
95                 cgit_print_pageheader(title, 0);
96                 cgit_print_error(tmp);
97                 cgit_print_docend();
98                 return;
99         }
100
101         title = fmt("%s - %s", ctx.repo->name, ctx.repo->desc);
102         show_search = 0;
103
104         if (!ctx.qry.head) {
105                 ctx.qry.head = xstrdup(find_default_branch(ctx.repo));
106                 ctx.repo->defbranch = ctx.qry.head;
107         }
108
109         if (!ctx.qry.head) {
110                 cgit_print_docstart(title, item);
111                 cgit_print_pageheader(title, 0);
112                 cgit_print_error("Repository seems to be empty");
113                 cgit_print_docend();
114                 return;
115         }
116
117         if (get_sha1(ctx.qry.head, sha1)) {
118                 tmp = xstrdup(ctx.qry.head);
119                 ctx.qry.head = ctx.repo->defbranch;
120                 cgit_print_docstart(title, item);
121                 cgit_print_pageheader(title, 0);
122                 cgit_print_error(fmt("Invalid branch: %s", tmp));
123                 cgit_print_docend();
124                 return;
125         }
126
127         if ((cgit_cmd == CMD_SNAPSHOT) && ctx.repo->snapshots) {
128                 cgit_print_snapshot(item, ctx.qry.head, ctx.qry.sha1,
129                                     cgit_repobasename(ctx.repo->url),
130                                     ctx.qry.path,
131                                     ctx.repo->snapshots );
132                 return;
133         }
134
135         if (cgit_cmd == CMD_PATCH) {
136                 cgit_print_patch(ctx.qry.sha1, item);
137                 return;
138         }
139
140         if (cgit_cmd == CMD_BLOB) {
141                 cgit_print_blob(item, ctx.qry.sha1, ctx.qry.path);
142                 return;
143         }
144
145         show_search = (cgit_cmd == CMD_LOG);
146         cgit_print_docstart(title, item);
147         if (!cgit_cmd) {
148                 cgit_print_pageheader("summary", show_search);
149                 cgit_print_summary();
150                 cgit_print_docend();
151                 return;
152         }
153
154         cgit_print_pageheader(ctx.qry.page, show_search);
155
156         switch(cgit_cmd) {
157         case CMD_LOG:
158                 cgit_print_log(ctx.qry.sha1, ctx.qry.ofs,
159                                ctx.cfg.max_commit_count, ctx.qry.grep, ctx.qry.search,
160                                ctx.qry.path, 1);
161                 break;
162         case CMD_TREE:
163                 cgit_print_tree(ctx.qry.sha1, ctx.qry.path);
164                 break;
165         case CMD_COMMIT:
166                 cgit_print_commit(ctx.qry.sha1);
167                 break;
168         case CMD_REFS:
169                 cgit_print_refs();
170                 break;
171         case CMD_TAG:
172                 cgit_print_tag(ctx.qry.sha1);
173                 break;
174         case CMD_DIFF:
175                 cgit_print_diff(ctx.qry.sha1, ctx.qry.sha2, ctx.qry.path);
176                 break;
177         default:
178                 cgit_print_error("Invalid request");
179         }
180         cgit_print_docend();
181 }
182
183 static void cgit_fill_cache(struct cacheitem *item, int use_cache)
184 {
185         int stdout2;
186
187         item->st.st_mtime = time(NULL);
188
189         if (use_cache) {
190                 stdout2 = chk_positive(dup(STDOUT_FILENO),
191                                        "Preserving STDOUT");
192                 chk_zero(close(STDOUT_FILENO), "Closing STDOUT");
193                 chk_positive(dup2(item->fd, STDOUT_FILENO), "Dup2(cachefile)");
194         }
195
196         if (ctx.repo)
197                 cgit_print_repo_page(item);
198         else
199                 cgit_print_repolist(item);
200
201         if (use_cache) {
202                 chk_zero(close(STDOUT_FILENO), "Close redirected STDOUT");
203                 chk_positive(dup2(stdout2, STDOUT_FILENO),
204                              "Restoring original STDOUT");
205                 chk_zero(close(stdout2), "Closing temporary STDOUT");
206         }
207 }
208
209 static void cgit_check_cache(struct cacheitem *item)
210 {
211         int i = 0;
212
213  top:
214         if (++i > ctx.cfg.max_lock_attempts) {
215                 die("cgit_refresh_cache: unable to lock %s: %s",
216                     item->name, strerror(errno));
217         }
218         if (!cache_exist(item)) {
219                 if (!cache_lock(item)) {
220                         sleep(1);
221                         goto top;
222                 }
223                 if (!cache_exist(item)) {
224                         cgit_fill_cache(item, 1);
225                         cache_unlock(item);
226                 } else {
227                         cache_cancel_lock(item);
228                 }
229         } else if (cache_expired(item) && cache_lock(item)) {
230                 if (cache_expired(item)) {
231                         cgit_fill_cache(item, 1);
232                         cache_unlock(item);
233                 } else {
234                         cache_cancel_lock(item);
235                 }
236         }
237 }
238
239 static void cgit_print_cache(struct cacheitem *item)
240 {
241         static char buf[4096];
242         ssize_t i;
243
244         int fd = open(item->name, O_RDONLY);
245         if (fd<0)
246                 die("Unable to open cached file %s", item->name);
247
248         while((i=read(fd, buf, sizeof(buf))) > 0)
249                 write(STDOUT_FILENO, buf, i);
250
251         close(fd);
252 }
253
254 static void cgit_parse_args(int argc, const char **argv)
255 {
256         int i;
257
258         for (i = 1; i < argc; i++) {
259                 if (!strncmp(argv[i], "--cache=", 8)) {
260                         ctx.cfg.cache_root = xstrdup(argv[i]+8);
261                 }
262                 if (!strcmp(argv[i], "--nocache")) {
263                         ctx.cfg.nocache = 1;
264                 }
265                 if (!strncmp(argv[i], "--query=", 8)) {
266                         ctx.qry.raw = xstrdup(argv[i]+8);
267                 }
268                 if (!strncmp(argv[i], "--repo=", 7)) {
269                         ctx.qry.repo = xstrdup(argv[i]+7);
270                 }
271                 if (!strncmp(argv[i], "--page=", 7)) {
272                         ctx.qry.page = xstrdup(argv[i]+7);
273                 }
274                 if (!strncmp(argv[i], "--head=", 7)) {
275                         ctx.qry.head = xstrdup(argv[i]+7);
276                         ctx.qry.has_symref = 1;
277                 }
278                 if (!strncmp(argv[i], "--sha1=", 7)) {
279                         ctx.qry.sha1 = xstrdup(argv[i]+7);
280                         ctx.qry.has_sha1 = 1;
281                 }
282                 if (!strncmp(argv[i], "--ofs=", 6)) {
283                         ctx.qry.ofs = atoi(argv[i]+6);
284                 }
285         }
286 }
287
288 int main(int argc, const char **argv)
289 {
290         struct cacheitem item;
291         const char *cgit_config_env = getenv("CGIT_CONFIG");
292
293         cgit_prepare_context(&ctx);
294         htmlfd = STDOUT_FILENO;
295         item.st.st_mtime = time(NULL);
296         cgit_repolist.length = 0;
297         cgit_repolist.count = 0;
298         cgit_repolist.repos = NULL;
299
300         cgit_read_config(cgit_config_env ? cgit_config_env : CGIT_CONFIG,
301                          cgit_global_config_cb);
302         if (getenv("SCRIPT_NAME"))
303                 ctx.cfg.script_name = xstrdup(getenv("SCRIPT_NAME"));
304         if (getenv("QUERY_STRING"))
305                 ctx.qry.raw = xstrdup(getenv("QUERY_STRING"));
306         cgit_parse_args(argc, argv);
307         cgit_parse_query(ctx.qry.raw, cgit_querystring_cb);
308         if (!cgit_prepare_cache(&item))
309                 return 0;
310         if (ctx.cfg.nocache) {
311                 cgit_fill_cache(&item, 0);
312         } else {
313                 cgit_check_cache(&item);
314                 cgit_print_cache(&item);
315         }
316         return 0;
317 }