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
13const char cgit_doctype[] =
14"<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\"\n"
15" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">\n";
16
17const char cgit_error[] =
18"<div class='error'>%s</div>";
19
20const char cgit_lib_error[] =
21"<div class='error'>%s: %s</div>";
22
23int htmlfd = 0;
24
25char *cgit_root = "/usr/src/git";
26char *cgit_root_title = "Git repository browser";
27char *cgit_css = "/cgit.css";
28char *cgit_logo = "/git-logo.png";
29char *cgit_logo_link = "http://www.kernel.org/pub/software/scm/git/docs/";
30char *cgit_virtual_root = NULL;
31
32char *cgit_cache_root = "/var/cache/cgit";
33
34int cgit_max_lock_attempts = 5;
35int cgit_cache_root_ttl = 5;
36int cgit_cache_repo_ttl = 5;
37int cgit_cache_dynamic_ttl = 5;
38int cgit_cache_static_ttl = -1;
39int cgit_cache_max_create_time = 5;
40
41char *cgit_repo_name = NULL;
42char *cgit_repo_desc = NULL;
43char *cgit_repo_owner = NULL;
44
45int cgit_query_has_symref = 0;
46int cgit_query_has_sha1 = 0;
47
48char *cgit_querystring = NULL;
49char *cgit_query_repo = NULL;
50char *cgit_query_page = NULL;
51char *cgit_query_head = NULL;
52char *cgit_query_sha1 = NULL;
53
54struct cacheitem cacheitem;
55
56int cgit_parse_query(char *txt, configfn fn)
57{
58 char *t, *value = NULL, c;
59
60 if (!txt)
61 return 0;
62
63 t = txt = xstrdup(txt);
64
65 while((c=*t) != '\0') {
66 if (c=='=') {
67 *t = '\0';
68 value = t+1;
69 } else if (c=='&') {
70 *t = '\0';
71 (*fn)(txt, value);
72 txt = t+1;
73 value = NULL;
74 }
75 t++;
76 }
77 if (t!=txt)
78 (*fn)(txt, value);
79 return 0;
80}
81
82void cgit_global_config_cb(const char *name, const char *value)
83{
84 if (!strcmp(name, "root"))
85 cgit_root = xstrdup(value);
86 else if (!strcmp(name, "root-title"))
87 cgit_root_title = xstrdup(value);
88 else if (!strcmp(name, "css"))
89 cgit_css = xstrdup(value);
90 else if (!strcmp(name, "logo"))
91 cgit_logo = xstrdup(value);
92 else if (!strcmp(name, "logo-link"))
93 cgit_logo_link = xstrdup(value);
94 else if (!strcmp(name, "virtual-root"))
95 cgit_virtual_root = xstrdup(value);
96}
97
98void cgit_repo_config_cb(const char *name, const char *value)
99{
100 if (!strcmp(name, "name"))
101 cgit_repo_name = xstrdup(value);
102 else if (!strcmp(name, "desc"))
103 cgit_repo_desc = xstrdup(value);
104 else if (!strcmp(name, "owner"))
105 cgit_repo_owner = xstrdup(value);
106}
107
108void cgit_querystring_cb(const char *name, const char *value)
109{
110 if (!strcmp(name,"r"))
111 cgit_query_repo = xstrdup(value);
112 else if (!strcmp(name, "p"))
113 cgit_query_page = xstrdup(value);
114 else if (!strcmp(name, "h")) {
115 cgit_query_head = xstrdup(value);
116 cgit_query_has_symref = 1;
117 } else if (!strcmp(name, "id")) {
118 cgit_query_sha1 = xstrdup(value);
119 cgit_query_has_sha1 = 1;
120 }
121}
122
123char *cgit_repourl(const char *reponame)
124{
125 if (cgit_virtual_root) {
126 return fmt("%s/%s/", cgit_virtual_root, reponame);
127 } else {
128 return fmt("?r=%s", reponame);
129 }
130}
131
132char *cgit_pageurl(const char *reponame, const char *pagename,
133 const char *query)
134{
135 if (cgit_virtual_root) {
136 return fmt("%s/%s/%s/?%s", cgit_virtual_root, reponame,
137 pagename, query);
138 } else {
139 return fmt("?r=%s&p=%s&%s", reponame, pagename, query);
140 }
141}
142
143static int cgit_print_branch_cb(const char *refname, const unsigned char *sha1,
144 int flags, void *cb_data)
145{
146 struct commit *commit;
147 char buf[256], *url;
148
149 commit = lookup_commit(sha1);
150 if (commit && !parse_commit(commit)){
151 html("<tr><td>");
152 url = cgit_pageurl(cgit_query_repo, "log",
153 fmt("h=%s", refname));
154 html_link_open(url, NULL, NULL);
155 strncpy(buf, refname, sizeof(buf));
156 html_txt(buf);
157 html_link_close();
158 html("</td><td>");
159 pretty_print_commit(CMIT_FMT_ONELINE, commit, ~0, buf,
160 sizeof(buf), 0, NULL, NULL, 0);
161 html_txt(buf);
162 html("</td></tr>\n");
163 } else {
164 html("<tr><td>");
165 html_txt(buf);
166 html("</td><td>");
167 htmlf("*** bad ref %s", sha1_to_hex(sha1));
168 html("</td></tr>\n");
169 }
170 return 0;
171}
172
173/* Sun, 06 Nov 1994 08:49:37 GMT */
174static char *http_date(time_t t)
175{
176 static char day[][4] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
177 static char month[][4] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
178 "Jul", "Aug", "Sep", "Oct", "Now", "Dec"};
179 struct tm *tm = gmtime(&t);
180 return fmt("%s, %02d %s %04d %02d:%02d:%02d GMT", day[tm->tm_wday],
181 tm->tm_mday, month[tm->tm_mon], 1900+tm->tm_year,
182 tm->tm_hour, tm->tm_min, tm->tm_sec);
183}
184
185static int ttl_seconds(int ttl)
186{
187 if (ttl<0)
188 return 60 * 60 * 24 * 365;
189 else
190 return ttl * 60;
191}
192
193static void cgit_print_docstart(char *title)
194{
195 html("Content-Type: text/html; charset=utf-8\n");
196 htmlf("Last-Modified: %s\n", http_date(cacheitem.st.st_mtime));
197 htmlf("Expires: %s\n", http_date(cacheitem.st.st_mtime +
198 ttl_seconds(cacheitem.ttl)));
199 html("\n");
200 html(cgit_doctype);
201 html("<html>\n");
202 html("<head>\n");
203 html("<title>");
204 html_txt(title);
205 html("</title>\n");
206 htmlf("<meta name='generator' content='cgit v%s'/>\n", cgit_version);
207 html("<link rel='stylesheet' type='text/css' href='");
208 html_attr(cgit_css);
209 html("'/>\n");
210 html("</head>\n");
211 html("<body>\n");
212}
213
214static void cgit_print_docend()
215{
216 html("</body>\n</html>\n");
217}
218
219static void cgit_print_pageheader(char *title)
220{
221 html("<div id='header'>");
222 htmlf("<a href='%s'>", cgit_logo_link);
223 htmlf("<img id='logo' src='%s'/>\n", cgit_logo);
224 htmlf("</a>");
225 html_txt(title);
226 html("</div>");
227}
228
229static void cgit_print_repolist()
230{
231 DIR *d;
232 struct dirent *de;
233 struct stat st;
234 char *name;
235
236 chdir(cgit_root);
237 cgit_print_docstart(cgit_root_title);
238 cgit_print_pageheader(cgit_root_title);
239
240 if (!(d = opendir("."))) {
241 htmlf(cgit_lib_error, "Unable to scan repository directory",
242 strerror(errno));
243 cgit_print_docend();
244 return;
245 }
246
247 html("<h2>Repositories</h2>\n");
248 html("<table class='list'>");
249 html("<tr><th>Name</th><th>Description</th><th>Owner</th></tr>\n");
250 while ((de = readdir(d)) != NULL) {
251 if (de->d_name[0] == '.')
252 continue;
253 if (stat(de->d_name, &st) < 0)
254 continue;
255 if (!S_ISDIR(st.st_mode))
256 continue;
257
258 cgit_repo_name = cgit_repo_desc = cgit_repo_owner = NULL;
259 name = fmt("%s/info/cgit", de->d_name);
260 if (cgit_read_config(name, cgit_repo_config_cb))
261 continue;
262
263 html("<tr><td>");
264 html_link_open(cgit_repourl(de->d_name), NULL, NULL);
265 html_txt(cgit_repo_name);
266 html_link_close();
267 html("</td><td>");
268 html_txt(cgit_repo_desc);
269 html("</td><td>");
270 html_txt(cgit_repo_owner);
271 html("</td></tr>\n");
272 }
273 closedir(d);
274 html("</table>");
275 cgit_print_docend();
276}
277
278static void cgit_print_branches()
279{
280 html("<table class='list'>");
281 html("<tr><th>Branch name</th><th>Head commit</th></tr>\n");
282 for_each_branch_ref(cgit_print_branch_cb, NULL);
283 html("</table>");
284}
285
286static int get_one_line(char *txt)
287{
288 char *t;
289
290 for(t=txt; *t != '\n' && t != '\0'; t++)
291 ;
292 *t = '\0';
293 return t-txt-1;
294}
295
296static void cgit_print_commit_shortlog(struct commit *commit)
297{
298 char *h, *t, *p;
299 char *tree = NULL, *author = NULL, *subject = NULL;
300 int len;
301 time_t sec;
302 struct tm *time;
303 char buf[32];
304
305 h = t = commit->buffer;
306
307 if (strncmp(h, "tree ", 5))
308 die("Bad commit format: %s",
309 sha1_to_hex(commit->object.sha1));
310
311 len = get_one_line(h);
312 tree = h+5;
313 h += len + 2;
314
315 while (!strncmp(h, "parent ", 7))
316 h += get_one_line(h) + 2;
317
318 if (!strncmp(h, "author ", 7)) {
319 author = h+7;
320 h += get_one_line(h) + 2;
321 t = author;
322 while(t!=h && *t!='<')
323 t++;
324 *t='\0';
325 p = t;
326 while(--t!=author && *t==' ')
327 *t='\0';
328 while(++p!=h && *p!='>')
329 ;
330 while(++p!=h && !isdigit(*p))
331 ;
332
333 t = p;
334 while(++p && isdigit(*p))
335 ;
336 *p = '\0';
337 sec = atoi(t);
338 time = gmtime(&sec);
339 }
340
341 while((len = get_one_line(h)) > 0)
342 h += len+2;
343
344 h++;
345 len = get_one_line(h);
346
347 subject = h;
348
349 html("<tr><td>");
350 strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", time);
351 html_txt(buf);
352 html("</td><td>");
353 char *qry = fmt("id=%s", sha1_to_hex(commit->object.sha1));
354 char *url = cgit_pageurl(cgit_query_repo, "view", qry);
355 html_link_open(url, NULL, NULL);
356 html_txt(subject);
357 html_link_close();
358 html("</td><td>");
359 html_txt(author);
360 html("</td></tr>\n");
361}
362
363static void cgit_print_log(const char *tip, int ofs, int cnt)
364{
365 struct rev_info rev;
366 struct commit *commit;
367 const char *argv[2] = {NULL, tip};
368 int n = 0;
369
370 init_revisions(&rev, NULL);
371 rev.abbrev = DEFAULT_ABBREV;
372 rev.commit_format = CMIT_FMT_DEFAULT;
373 rev.verbose_header = 1;
374 rev.show_root_diff = 0;
375 setup_revisions(2, argv, &rev, NULL);
376 prepare_revision_walk(&rev);
377
378 html("<h2>Log</h2>");
379 html("<table class='list'>");
380 html("<tr><th>Date</th><th>Message</th><th>Author</th></tr>\n");
381 while ((commit = get_revision(&rev)) != NULL && n++ < 100) {
382 cgit_print_commit_shortlog(commit);
383 free(commit->buffer);
384 commit->buffer = NULL;
385 free_commit_list(commit->parents);
386 commit->parents = NULL;
387 }
388 html("</table>\n");
389}
390
391static void cgit_print_repo_summary()
392{
393 html("<h2>");
394 html_txt("Repo summary page");
395 html("</h2>");
396 cgit_print_branches();
397}
398
399static void cgit_print_object(char *hex)
400{
401 unsigned char sha1[20];
402 //struct object *object;
403 char type[20];
404 unsigned char *buf;
405 unsigned long size;
406
407 if (get_sha1_hex(hex, sha1)){
408 htmlf(cgit_error, "Bad hex value");
409 return;
410 }
411
412 if (sha1_object_info(sha1, type, NULL)){
413 htmlf(cgit_error, "Bad object name");
414 return;
415 }
416
417 buf = read_sha1_file(sha1, type, &size);
418 if (!buf) {
419 htmlf(cgit_error, "Error reading object");
420 return;
421 }
422
423 buf[size] = '\0';
424 html("<h2>Object view</h2>");
425 htmlf("sha1=%s<br/>type=%s<br/>size=%i<br/>", hex, type, size);
426 html("<pre>");
427 html_txt(buf);
428 html("</pre>");
429}
430
431static void cgit_print_repo_page()
432{
433 if (chdir(fmt("%s/%s", cgit_root, cgit_query_repo)) ||
434 cgit_read_config("info/cgit", cgit_repo_config_cb)) {
435 char *title = fmt("%s - %s", cgit_root_title, "Bad request");
436 cgit_print_docstart(title);
437 cgit_print_pageheader(title);
438 htmlf(cgit_lib_error, "Unable to scan repository",
439 strerror(errno));
440 cgit_print_docend();
441 return;
442 }
443 setenv("GIT_DIR", fmt("%s/%s", cgit_root, cgit_query_repo), 1);
444 char *title = fmt("%s - %s", cgit_repo_name, cgit_repo_desc);
445 cgit_print_docstart(title);
446 cgit_print_pageheader(title);
447 if (!cgit_query_page)
448 cgit_print_repo_summary();
449 else if (!strcmp(cgit_query_page, "log")) {
450 cgit_print_log(cgit_query_head, 0, 100);
451 } else if (!strcmp(cgit_query_page, "view")) {
452 cgit_print_object(cgit_query_sha1);
453 }
454 cgit_print_docend();
455}
456
457static void cgit_fill_cache(struct cacheitem *item)
458{
459 htmlfd = item->fd;
460 item->st.st_mtime = time(NULL);
461 if (cgit_query_repo)
462 cgit_print_repo_page();
463 else
464 cgit_print_repolist();
465}
466
467static void cgit_refresh_cache(struct cacheitem *item)
468{
469 int i = 0;
470
471 cache_prepare(item);
472 top:
473 if (++i > cgit_max_lock_attempts) {
474 die("cgit_refresh_cache: unable to lock %s: %s",
475 item->name, strerror(errno));
476 }
477 if (!cache_exist(item)) {
478 if (!cache_lock(item)) {
479 sleep(1);
480 goto top;
481 }
482 if (!cache_exist(item))
483 cgit_fill_cache(item);
484 cache_unlock(item);
485 } else if (cache_expired(item) && cache_lock(item)) {
486 if (cache_expired(item))
487 cgit_fill_cache(item);
488 cache_unlock(item);
489 }
490}
491
492static void cgit_print_cache(struct cacheitem *item)
493{
494 static char buf[4096];
495 ssize_t i;
496
497 int fd = open(item->name, O_RDONLY);
498 if (fd<0)
499 die("Unable to open cached file %s", item->name);
500
501 while((i=read(fd, buf, sizeof(buf))) > 0)
502 write(STDOUT_FILENO, buf, i);
503
504 close(fd);
505}
506
507int main(int argc, const char **argv)
508{
509 cgit_read_config("/etc/cgitrc", cgit_global_config_cb);
510 cgit_querystring = xstrdup(getenv("QUERY_STRING"));
511 cgit_parse_query(cgit_querystring, cgit_querystring_cb);
512 cgit_refresh_cache(&cacheitem);
513 cgit_print_cache(&cacheitem);
514 return 0;
515}