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 const char cgit_doctype[] =
12"<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\"\n"
13" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">\n";
14
15static const char cgit_error[] =
16"<div class='error'>%s</div>";
17
18static const char cgit_lib_error[] =
19"<div class='error'>%s: %s</div>";
20
21int htmlfd = 0;
22
23char *cgit_root = "/usr/src/git";
24char *cgit_root_title = "Git repository browser";
25char *cgit_css = "/cgit.css";
26char *cgit_logo = "/git-logo.png";
27char *cgit_logo_link = "http://www.kernel.org/pub/software/scm/git/docs/";
28char *cgit_virtual_root = NULL;
29
30char *cgit_cache_root = "/var/cache/cgit";
31
32int cgit_cache_root_ttl = 5;
33int cgit_cache_repo_ttl = 5;
34int cgit_cache_dynamic_ttl = 5;
35int cgit_cache_static_ttl = -1;
36int cgit_cache_max_create_time = 5;
37
38char *cgit_repo_name = NULL;
39char *cgit_repo_desc = NULL;
40char *cgit_repo_owner = NULL;
41
42int cgit_query_has_symref = 0;
43int cgit_query_has_sha1 = 0;
44
45char *cgit_querystring = NULL;
46char *cgit_query_repo = NULL;
47char *cgit_query_page = NULL;
48char *cgit_query_head = NULL;
49char *cgit_query_sha1 = NULL;
50
51struct cacheitem cacheitem;
52
53int cgit_parse_query(char *txt, configfn fn)
54{
55 char *t, *value = NULL, c;
56
57 if (!txt)
58 return 0;
59
60 t = txt = xstrdup(txt);
61
62 while((c=*t) != '\0') {
63 if (c=='=') {
64 *t = '\0';
65 value = t+1;
66 } else if (c=='&') {
67 *t = '\0';
68 (*fn)(txt, value);
69 txt = t+1;
70 value = NULL;
71 }
72 t++;
73 }
74 if (t!=txt)
75 (*fn)(txt, value);
76 return 0;
77}
78
79void cgit_global_config_cb(const char *name, const char *value)
80{
81 if (!strcmp(name, "root"))
82 cgit_root = xstrdup(value);
83 else if (!strcmp(name, "root-title"))
84 cgit_root_title = xstrdup(value);
85 else if (!strcmp(name, "css"))
86 cgit_css = xstrdup(value);
87 else if (!strcmp(name, "logo"))
88 cgit_logo = xstrdup(value);
89 else if (!strcmp(name, "logo-link"))
90 cgit_logo_link = xstrdup(value);
91 else if (!strcmp(name, "virtual-root"))
92 cgit_virtual_root = xstrdup(value);
93}
94
95void cgit_repo_config_cb(const char *name, const char *value)
96{
97 if (!strcmp(name, "name"))
98 cgit_repo_name = xstrdup(value);
99 else if (!strcmp(name, "desc"))
100 cgit_repo_desc = xstrdup(value);
101 else if (!strcmp(name, "owner"))
102 cgit_repo_owner = xstrdup(value);
103}
104
105void cgit_querystring_cb(const char *name, const char *value)
106{
107 if (!strcmp(name,"r"))
108 cgit_query_repo = xstrdup(value);
109 else if (!strcmp(name, "p"))
110 cgit_query_page = xstrdup(value);
111 else if (!strcmp(name, "h")) {
112 cgit_query_head = xstrdup(value);
113 cgit_query_has_symref = 1;
114 } else if (!strcmp(name, "id")) {
115 cgit_query_sha1 = xstrdup(value);
116 cgit_query_has_sha1 = 1;
117 }
118}
119
120char *cgit_repourl(const char *reponame)
121{
122 if (cgit_virtual_root) {
123 return fmt("%s/%s/", cgit_virtual_root, reponame);
124 } else {
125 return fmt("?r=%s", reponame);
126 }
127}
128
129char *cgit_pageurl(const char *reponame, const char *pagename,
130 const char *query)
131{
132 if (cgit_virtual_root) {
133 return fmt("%s/%s/%s/?%s", cgit_virtual_root, reponame,
134 pagename, query);
135 } else {
136 return fmt("?r=%s&p=%s&%s", reponame, pagename, query);
137 }
138}
139
140static int cgit_print_branch_cb(const char *refname, const unsigned char *sha1,
141 int flags, void *cb_data)
142{
143 struct commit *commit;
144 char buf[256], *url;
145
146 commit = lookup_commit(sha1);
147 if (commit && !parse_commit(commit)){
148 html("<tr><td>");
149 url = cgit_pageurl(cgit_query_repo, "log",
150 fmt("h=%s", refname));
151 html_link_open(url, NULL, NULL);
152 strncpy(buf, refname, sizeof(buf));
153 html_txt(buf);
154 html_link_close();
155 html("</td><td>");
156 pretty_print_commit(CMIT_FMT_ONELINE, commit, ~0, buf,
157 sizeof(buf), 0, NULL, NULL, 0);
158 html_txt(buf);
159 html("</td></tr>\n");
160 } else {
161 html("<tr><td>");
162 html_txt(buf);
163 html("</td><td>");
164 htmlf("*** bad ref %s", sha1_to_hex(sha1));
165 html("</td></tr>\n");
166 }
167 return 0;
168}
169
170/* Sun, 06 Nov 1994 08:49:37 GMT */
171static char *http_date(time_t t)
172{
173 static char day[][4] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
174 static char month[][4] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
175 "Jul", "Aug", "Sep", "Oct", "Now", "Dec"};
176 struct tm *tm = gmtime(&t);
177 return fmt("%s, %02d %s %04d %02d:%02d:%02d GMT", day[tm->tm_wday],
178 tm->tm_mday, month[tm->tm_mon], 1900+tm->tm_year,
179 tm->tm_hour, tm->tm_min, tm->tm_sec);
180}
181
182static int ttl_seconds(int ttl)
183{
184 if (ttl<0)
185 return 60 * 60 * 24 * 365;
186 else
187 return ttl * 60;
188}
189
190static void cgit_print_docstart(char *title)
191{
192 html("Content-Type: text/html; charset=utf-8\n");
193 htmlf("Last-Modified: %s\n", http_date(cacheitem.st.st_mtime));
194 htmlf("Expires: %s\n", http_date(cacheitem.st.st_mtime +
195 ttl_seconds(cacheitem.ttl)));
196 html("\n");
197 html(cgit_doctype);
198 html("<html>\n");
199 html("<head>\n");
200 html("<title>");
201 html_txt(title);
202 html("</title>\n");
203 html("<link rel='stylesheet' type='text/css' href='");
204 html_attr(cgit_css);
205 html("'/>\n");
206 html("</head>\n");
207 html("<body>\n");
208}
209
210static void cgit_print_docend()
211{
212 html("</body>\n</html>\n");
213}
214
215static void cgit_print_pageheader(char *title)
216{
217 html("<div id='header'>");
218 htmlf("<a href='%s'>", cgit_logo_link);
219 htmlf("<img id='logo' src='%s'/>\n", cgit_logo);
220 htmlf("</a>");
221 html_txt(title);
222 html("</div>");
223}
224
225static void cgit_print_repolist()
226{
227 DIR *d;
228 struct dirent *de;
229 struct stat st;
230 char *name;
231
232 chdir(cgit_root);
233 cgit_print_docstart(cgit_root_title);
234 cgit_print_pageheader(cgit_root_title);
235
236 if (!(d = opendir("."))) {
237 htmlf(cgit_lib_error, "Unable to scan repository directory",
238 strerror(errno));
239 cgit_print_docend();
240 return;
241 }
242
243 html("<h2>Repositories</h2>\n");
244 html("<table class='list'>");
245 html("<tr><th>Name</th><th>Description</th><th>Owner</th></tr>\n");
246 while ((de = readdir(d)) != NULL) {
247 if (de->d_name[0] == '.')
248 continue;
249 if (stat(de->d_name, &st) < 0)
250 continue;
251 if (!S_ISDIR(st.st_mode))
252 continue;
253
254 cgit_repo_name = cgit_repo_desc = cgit_repo_owner = NULL;
255 name = fmt("%s/info/cgit", de->d_name);
256 if (cgit_read_config(name, cgit_repo_config_cb))
257 continue;
258
259 html("<tr><td>");
260 html_link_open(cgit_repourl(de->d_name), NULL, NULL);
261 html_txt(cgit_repo_name);
262 html_link_close();
263 html("</td><td>");
264 html_txt(cgit_repo_desc);
265 html("</td><td>");
266 html_txt(cgit_repo_owner);
267 html("</td></tr>\n");
268 }
269 closedir(d);
270 html("</table>");
271 cgit_print_docend();
272}
273
274static void cgit_print_branches()
275{
276 html("<table class='list'>");
277 html("<tr><th>Branch name</th><th>Head commit</th></tr>\n");
278 for_each_branch_ref(cgit_print_branch_cb, NULL);
279 html("</table>");
280}
281
282static int get_one_line(char *txt)
283{
284 char *t;
285
286 for(t=txt; *t != '\n' && t != '\0'; t++)
287 ;
288 *t = '\0';
289 return t-txt-1;
290}
291
292static void cgit_print_commit_shortlog(struct commit *commit)
293{
294 char *h, *t, *p;
295 char *tree = NULL, *author = NULL, *subject = NULL;
296 int len;
297 time_t sec;
298 struct tm *time;
299 char buf[32];
300
301 h = t = commit->buffer;
302
303 if (strncmp(h, "tree ", 5))
304 die("Bad commit format: %s",
305 sha1_to_hex(commit->object.sha1));
306
307 len = get_one_line(h);
308 tree = h+5;
309 h += len + 2;
310
311 while (!strncmp(h, "parent ", 7))
312 h += get_one_line(h) + 2;
313
314 if (!strncmp(h, "author ", 7)) {
315 author = h+7;
316 h += get_one_line(h) + 2;
317 t = author;
318 while(t!=h && *t!='<')
319 t++;
320 *t='\0';
321 p = t;
322 while(--t!=author && *t==' ')
323 *t='\0';
324 while(++p!=h && *p!='>')
325 ;
326 while(++p!=h && !isdigit(*p))
327 ;
328
329 t = p;
330 while(++p && isdigit(*p))
331 ;
332 *p = '\0';
333 sec = atoi(t);
334 time = gmtime(&sec);
335 }
336
337 while((len = get_one_line(h)) > 0)
338 h += len+2;
339
340 h++;
341 len = get_one_line(h);
342
343 subject = h;
344
345 html("<tr><td>");
346 strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", time);
347 html_txt(buf);
348 html("</td><td>");
349 char *qry = fmt("id=%s", sha1_to_hex(commit->object.sha1));
350 char *url = cgit_pageurl(cgit_query_repo, "view", qry);
351 html_link_open(url, NULL, NULL);
352 html_txt(subject);
353 html_link_close();
354 html("</td><td>");
355 html_txt(author);
356 html("</td></tr>\n");
357}
358
359static void cgit_print_log(const char *tip, int ofs, int cnt)
360{
361 struct rev_info rev;
362 struct commit *commit;
363 const char *argv[2] = {NULL, tip};
364 int n = 0;
365
366 init_revisions(&rev, NULL);
367 rev.abbrev = DEFAULT_ABBREV;
368 rev.commit_format = CMIT_FMT_DEFAULT;
369 rev.verbose_header = 1;
370 rev.show_root_diff = 0;
371 setup_revisions(2, argv, &rev, NULL);
372 prepare_revision_walk(&rev);
373
374 html("<h2>Log</h2>");
375 html("<table class='list'>");
376 html("<tr><th>Date</th><th>Message</th><th>Author</th></tr>\n");
377 while ((commit = get_revision(&rev)) != NULL && n++ < 100) {
378 cgit_print_commit_shortlog(commit);
379 free(commit->buffer);
380 commit->buffer = NULL;
381 free_commit_list(commit->parents);
382 commit->parents = NULL;
383 }
384 html("</table>\n");
385}
386
387static void cgit_print_repo_summary()
388{
389 html("<h2>");
390 html_txt("Repo summary page");
391 html("</h2>");
392 cgit_print_branches();
393}
394
395static void cgit_print_object(char *hex)
396{
397 unsigned char sha1[20];
398 //struct object *object;
399 char type[20];
400 unsigned char *buf;
401 unsigned long size;
402
403 if (get_sha1_hex(hex, sha1)){
404 htmlf(cgit_error, "Bad hex value");
405 return;
406 }
407
408 if (sha1_object_info(sha1, type, NULL)){
409 htmlf(cgit_error, "Bad object name");
410 return;
411 }
412
413 buf = read_sha1_file(sha1, type, &size);
414 if (!buf) {
415 htmlf(cgit_error, "Error reading object");
416 return;
417 }
418
419 buf[size] = '\0';
420 html("<h2>Object view</h2>");
421 htmlf("sha1=%s<br/>type=%s<br/>size=%i<br/>", hex, type, size);
422 html("<pre>");
423 html_txt(buf);
424 html("</pre>");
425}
426
427static void cgit_print_repo_page()
428{
429 if (chdir(fmt("%s/%s", cgit_root, cgit_query_repo)) ||
430 cgit_read_config("info/cgit", cgit_repo_config_cb)) {
431 char *title = fmt("%s - %s", cgit_root_title, "Bad request");
432 cgit_print_docstart(title);
433 cgit_print_pageheader(title);
434 htmlf(cgit_lib_error, "Unable to scan repository",
435 strerror(errno));
436 cgit_print_docend();
437 return;
438 }
439 setenv("GIT_DIR", fmt("%s/%s", cgit_root, cgit_query_repo), 1);
440 char *title = fmt("%s - %s", cgit_repo_name, cgit_repo_desc);
441 cgit_print_docstart(title);
442 cgit_print_pageheader(title);
443 if (!cgit_query_page)
444 cgit_print_repo_summary();
445 else if (!strcmp(cgit_query_page, "log")) {
446 cgit_print_log(cgit_query_head, 0, 100);
447 } else if (!strcmp(cgit_query_page, "view")) {
448 cgit_print_object(cgit_query_sha1);
449 }
450 cgit_print_docend();
451}
452
453static void cgit_fill_cache(struct cacheitem *item)
454{
455 htmlfd = item->fd;
456 item->st.st_mtime = time(NULL);
457 if (cgit_query_repo)
458 cgit_print_repo_page();
459 else
460 cgit_print_repolist();
461}
462
463static void cgit_refresh_cache(struct cacheitem *item)
464{
465 top:
466 if (!cache_lookup(item)) {
467 if (cache_lock(item)) {
468 cgit_fill_cache(item);
469 cache_unlock(item);
470 } else {
471 sched_yield();
472 goto top;
473 }
474 } else if (cache_expired(item)) {
475 if (cache_lock(item)) {
476 cgit_fill_cache(item);
477 cache_unlock(item);
478 }
479 }
480}
481
482static void cgit_print_cache(struct cacheitem *item)
483{
484 static char buf[4096];
485 ssize_t i;
486
487 int fd = open(item->name, O_RDONLY);
488 if (fd<0)
489 die("Unable to open cached file %s", item->name);
490
491 while((i=read(fd, buf, sizeof(buf))) > 0)
492 write(STDOUT_FILENO, buf, i);
493
494 close(fd);
495}
496
497int main(int argc, const char **argv)
498{
499 cgit_read_config("/etc/cgitrc", cgit_global_config_cb);
500 cgit_querystring = xstrdup(getenv("QUERY_STRING"));
501 cgit_parse_query(cgit_querystring, cgit_querystring_cb);
502 cgit_refresh_cache(&cacheitem);
503 cgit_print_cache(&cacheitem);
504 return 0;
505}