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#include "cache.h"
11#include "cmd.h"
12#include "configfile.h"
13#include "html.h"
14#include "ui-shared.h"
15
16const char *cgit_version = CGIT_VERSION;
17
18void config_cb(const char *name, const char *value)
19{
20 if (!strcmp(name, "root-title"))
21 ctx.cfg.root_title = xstrdup(value);
22 else if (!strcmp(name, "root-desc"))
23 ctx.cfg.root_desc = xstrdup(value);
24 else if (!strcmp(name, "css"))
25 ctx.cfg.css = xstrdup(value);
26 else if (!strcmp(name, "logo"))
27 ctx.cfg.logo = xstrdup(value);
28 else if (!strcmp(name, "index-header"))
29 ctx.cfg.index_header = xstrdup(value);
30 else if (!strcmp(name, "index-info"))
31 ctx.cfg.index_info = xstrdup(value);
32 else if (!strcmp(name, "logo-link"))
33 ctx.cfg.logo_link = xstrdup(value);
34 else if (!strcmp(name, "module-link"))
35 ctx.cfg.module_link = xstrdup(value);
36 else if (!strcmp(name, "virtual-root")) {
37 ctx.cfg.virtual_root = trim_end(value, '/');
38 if (!ctx.cfg.virtual_root && (!strcmp(value, "/")))
39 ctx.cfg.virtual_root = "";
40 } else if (!strcmp(name, "nocache"))
41 ctx.cfg.nocache = atoi(value);
42 else if (!strcmp(name, "snapshots"))
43 ctx.cfg.snapshots = cgit_parse_snapshots_mask(value);
44 else if (!strcmp(name, "enable-index-links"))
45 ctx.cfg.enable_index_links = atoi(value);
46 else if (!strcmp(name, "enable-log-filecount"))
47 ctx.cfg.enable_log_filecount = atoi(value);
48 else if (!strcmp(name, "enable-log-linecount"))
49 ctx.cfg.enable_log_linecount = atoi(value);
50 else if (!strcmp(name, "cache-root"))
51 ctx.cfg.cache_root = xstrdup(value);
52 else if (!strcmp(name, "cache-root-ttl"))
53 ctx.cfg.cache_root_ttl = atoi(value);
54 else if (!strcmp(name, "cache-repo-ttl"))
55 ctx.cfg.cache_repo_ttl = atoi(value);
56 else if (!strcmp(name, "cache-static-ttl"))
57 ctx.cfg.cache_static_ttl = atoi(value);
58 else if (!strcmp(name, "cache-dynamic-ttl"))
59 ctx.cfg.cache_dynamic_ttl = atoi(value);
60 else if (!strcmp(name, "max-message-length"))
61 ctx.cfg.max_msg_len = atoi(value);
62 else if (!strcmp(name, "max-repodesc-length"))
63 ctx.cfg.max_repodesc_len = atoi(value);
64 else if (!strcmp(name, "max-commit-count"))
65 ctx.cfg.max_commit_count = atoi(value);
66 else if (!strcmp(name, "summary-log"))
67 ctx.cfg.summary_log = atoi(value);
68 else if (!strcmp(name, "summary-branches"))
69 ctx.cfg.summary_branches = atoi(value);
70 else if (!strcmp(name, "summary-tags"))
71 ctx.cfg.summary_tags = atoi(value);
72 else if (!strcmp(name, "agefile"))
73 ctx.cfg.agefile = xstrdup(value);
74 else if (!strcmp(name, "renamelimit"))
75 ctx.cfg.renamelimit = atoi(value);
76 else if (!strcmp(name, "robots"))
77 ctx.cfg.robots = xstrdup(value);
78 else if (!strcmp(name, "clone-prefix"))
79 ctx.cfg.clone_prefix = xstrdup(value);
80 else if (!strcmp(name, "repo.group"))
81 ctx.cfg.repo_group = xstrdup(value);
82 else if (!strcmp(name, "repo.url"))
83 ctx.repo = cgit_add_repo(value);
84 else if (!strcmp(name, "repo.name"))
85 ctx.repo->name = xstrdup(value);
86 else if (ctx.repo && !strcmp(name, "repo.path"))
87 ctx.repo->path = trim_end(value, '/');
88 else if (ctx.repo && !strcmp(name, "repo.clone-url"))
89 ctx.repo->clone_url = xstrdup(value);
90 else if (ctx.repo && !strcmp(name, "repo.desc"))
91 ctx.repo->desc = xstrdup(value);
92 else if (ctx.repo && !strcmp(name, "repo.owner"))
93 ctx.repo->owner = xstrdup(value);
94 else if (ctx.repo && !strcmp(name, "repo.defbranch"))
95 ctx.repo->defbranch = xstrdup(value);
96 else if (ctx.repo && !strcmp(name, "repo.snapshots"))
97 ctx.repo->snapshots = ctx.cfg.snapshots & cgit_parse_snapshots_mask(value); /* XXX: &? */
98 else if (ctx.repo && !strcmp(name, "repo.enable-log-filecount"))
99 ctx.repo->enable_log_filecount = ctx.cfg.enable_log_filecount * atoi(value);
100 else if (ctx.repo && !strcmp(name, "repo.enable-log-linecount"))
101 ctx.repo->enable_log_linecount = ctx.cfg.enable_log_linecount * atoi(value);
102 else if (ctx.repo && !strcmp(name, "repo.module-link"))
103 ctx.repo->module_link= xstrdup(value);
104 else if (ctx.repo && !strcmp(name, "repo.readme") && value != NULL) {
105 if (*value == '/')
106 ctx.repo->readme = xstrdup(value);
107 else
108 ctx.repo->readme = xstrdup(fmt("%s/%s", ctx.repo->path, value));
109 } else if (!strcmp(name, "include"))
110 parse_configfile(value, config_cb);
111}
112
113static void querystring_cb(const char *name, const char *value)
114{
115 if (!strcmp(name,"r")) {
116 ctx.qry.repo = xstrdup(value);
117 ctx.repo = cgit_get_repoinfo(value);
118 } else if (!strcmp(name, "p")) {
119 ctx.qry.page = xstrdup(value);
120 } else if (!strcmp(name, "url")) {
121 cgit_parse_url(value);
122 } else if (!strcmp(name, "qt")) {
123 ctx.qry.grep = xstrdup(value);
124 } else if (!strcmp(name, "q")) {
125 ctx.qry.search = xstrdup(value);
126 } else if (!strcmp(name, "h")) {
127 ctx.qry.head = xstrdup(value);
128 ctx.qry.has_symref = 1;
129 } else if (!strcmp(name, "id")) {
130 ctx.qry.sha1 = xstrdup(value);
131 ctx.qry.has_sha1 = 1;
132 } else if (!strcmp(name, "id2")) {
133 ctx.qry.sha2 = xstrdup(value);
134 ctx.qry.has_sha1 = 1;
135 } else if (!strcmp(name, "ofs")) {
136 ctx.qry.ofs = atoi(value);
137 } else if (!strcmp(name, "path")) {
138 ctx.qry.path = trim_end(value, '/');
139 } else if (!strcmp(name, "name")) {
140 ctx.qry.name = xstrdup(value);
141 }
142}
143
144static void prepare_context(struct cgit_context *ctx)
145{
146 memset(ctx, 0, sizeof(ctx));
147 ctx->cfg.agefile = "info/web/last-modified";
148 ctx->cfg.cache_dynamic_ttl = 5;
149 ctx->cfg.cache_max_create_time = 5;
150 ctx->cfg.cache_repo_ttl = 5;
151 ctx->cfg.cache_root = CGIT_CACHE_ROOT;
152 ctx->cfg.cache_root_ttl = 5;
153 ctx->cfg.cache_static_ttl = -1;
154 ctx->cfg.css = "/cgit.css";
155 ctx->cfg.logo = "/git-logo.png";
156 ctx->cfg.max_commit_count = 50;
157 ctx->cfg.max_lock_attempts = 5;
158 ctx->cfg.max_msg_len = 60;
159 ctx->cfg.max_repodesc_len = 60;
160 ctx->cfg.module_link = "./?repo=%s&page=commit&id=%s";
161 ctx->cfg.renamelimit = -1;
162 ctx->cfg.robots = "index, nofollow";
163 ctx->cfg.root_title = "Git repository browser";
164 ctx->cfg.root_desc = "a fast webinterface for the git dscm";
165 ctx->cfg.script_name = CGIT_SCRIPT_NAME;
166 ctx->page.mimetype = "text/html";
167 ctx->page.charset = PAGE_ENCODING;
168 ctx->page.filename = NULL;
169}
170
171static int cgit_prepare_cache(struct cacheitem *item)
172{
173 if (!ctx.repo && ctx.qry.repo) {
174 ctx.page.title = fmt("%s - %s", ctx.cfg.root_title,
175 "Bad request");
176 cgit_print_http_headers(&ctx);
177 cgit_print_docstart(&ctx);
178 cgit_print_pageheader(&ctx);
179 cgit_print_error(fmt("Unknown repo: %s", ctx.qry.repo));
180 cgit_print_docend();
181 return 0;
182 }
183
184 if (!ctx.repo) {
185 item->name = xstrdup(fmt("%s/index.%s.html",
186 ctx.cfg.cache_root,
187 cache_safe_filename(ctx.qry.raw)));
188 item->ttl = ctx.cfg.cache_root_ttl;
189 return 1;
190 }
191
192 if (!ctx.qry.page) {
193 item->name = xstrdup(fmt("%s/%s/index.%s.html", ctx.cfg.cache_root,
194 cache_safe_filename(ctx.repo->url),
195 cache_safe_filename(ctx.qry.raw)));
196 item->ttl = ctx.cfg.cache_repo_ttl;
197 } else {
198 item->name = xstrdup(fmt("%s/%s/%s/%s.html", ctx.cfg.cache_root,
199 cache_safe_filename(ctx.repo->url),
200 ctx.qry.page,
201 cache_safe_filename(ctx.qry.raw)));
202 if (ctx.qry.has_symref)
203 item->ttl = ctx.cfg.cache_dynamic_ttl;
204 else if (ctx.qry.has_sha1)
205 item->ttl = ctx.cfg.cache_static_ttl;
206 else
207 item->ttl = ctx.cfg.cache_repo_ttl;
208 }
209 return 1;
210}
211
212struct refmatch {
213 char *req_ref;
214 char *first_ref;
215 int match;
216};
217
218int find_current_ref(const char *refname, const unsigned char *sha1,
219 int flags, void *cb_data)
220{
221 struct refmatch *info;
222
223 info = (struct refmatch *)cb_data;
224 if (!strcmp(refname, info->req_ref))
225 info->match = 1;
226 if (!info->first_ref)
227 info->first_ref = xstrdup(refname);
228 return info->match;
229}
230
231char *find_default_branch(struct cgit_repo *repo)
232{
233 struct refmatch info;
234
235 info.req_ref = repo->defbranch;
236 info.first_ref = NULL;
237 info.match = 0;
238 for_each_branch_ref(find_current_ref, &info);
239 if (info.match)
240 return info.req_ref;
241 else
242 return info.first_ref;
243}
244
245static int prepare_repo_cmd(struct cgit_context *ctx)
246{
247 char *tmp;
248 unsigned char sha1[20];
249 int nongit = 0;
250
251 setenv("GIT_DIR", ctx->repo->path, 1);
252 setup_git_directory_gently(&nongit);
253 if (nongit) {
254 ctx->page.title = fmt("%s - %s", ctx->cfg.root_title,
255 "config error");
256 tmp = fmt("Not a git repository: '%s'", ctx->repo->path);
257 ctx->repo = NULL;
258 cgit_print_http_headers(ctx);
259 cgit_print_docstart(ctx);
260 cgit_print_pageheader(ctx);
261 cgit_print_error(tmp);
262 cgit_print_docend();
263 return 1;
264 }
265 ctx->page.title = fmt("%s - %s", ctx->repo->name, ctx->repo->desc);
266
267 if (!ctx->qry.head) {
268 ctx->qry.head = xstrdup(find_default_branch(ctx->repo));
269 ctx->repo->defbranch = ctx->qry.head;
270 }
271
272 if (!ctx->qry.head) {
273 cgit_print_http_headers(ctx);
274 cgit_print_docstart(ctx);
275 cgit_print_pageheader(ctx);
276 cgit_print_error("Repository seems to be empty");
277 cgit_print_docend();
278 return 1;
279 }
280
281 if (get_sha1(ctx->qry.head, sha1)) {
282 tmp = xstrdup(ctx->qry.head);
283 ctx->qry.head = ctx->repo->defbranch;
284 cgit_print_http_headers(ctx);
285 cgit_print_docstart(ctx);
286 cgit_print_pageheader(ctx);
287 cgit_print_error(fmt("Invalid branch: %s", tmp));
288 cgit_print_docend();
289 return 1;
290 }
291 return 0;
292}
293
294static void process_request(struct cgit_context *ctx)
295{
296 struct cgit_cmd *cmd;
297
298 cmd = cgit_get_cmd(ctx);
299 if (!cmd) {
300 ctx->page.title = "cgit error";
301 ctx->repo = NULL;
302 cgit_print_http_headers(ctx);
303 cgit_print_docstart(ctx);
304 cgit_print_pageheader(ctx);
305 cgit_print_error("Invalid request");
306 cgit_print_docend();
307 return;
308 }
309
310 if (cmd->want_repo && !ctx->repo) {
311 cgit_print_http_headers(ctx);
312 cgit_print_docstart(ctx);
313 cgit_print_pageheader(ctx);
314 cgit_print_error(fmt("No repository selected"));
315 cgit_print_docend();
316 return;
317 }
318
319 if (ctx->repo && prepare_repo_cmd(ctx))
320 return;
321
322 if (cmd->want_layout) {
323 cgit_print_http_headers(ctx);
324 cgit_print_docstart(ctx);
325 cgit_print_pageheader(ctx);
326 }
327
328 cmd->fn(ctx);
329
330 if (cmd->want_layout)
331 cgit_print_docend();
332}
333
334static long ttl_seconds(long ttl)
335{
336 if (ttl<0)
337 return 60 * 60 * 24 * 365;
338 else
339 return ttl * 60;
340}
341
342static void cgit_fill_cache(struct cacheitem *item, int use_cache)
343{
344 int stdout2;
345
346 if (use_cache) {
347 stdout2 = chk_positive(dup(STDOUT_FILENO),
348 "Preserving STDOUT");
349 chk_zero(close(STDOUT_FILENO), "Closing STDOUT");
350 chk_positive(dup2(item->fd, STDOUT_FILENO), "Dup2(cachefile)");
351 }
352
353 ctx.page.modified = time(NULL);
354 ctx.page.expires = ctx.page.modified + ttl_seconds(item->ttl);
355 process_request(&ctx);
356
357 if (use_cache) {
358 chk_zero(close(STDOUT_FILENO), "Close redirected STDOUT");
359 chk_positive(dup2(stdout2, STDOUT_FILENO),
360 "Restoring original STDOUT");
361 chk_zero(close(stdout2), "Closing temporary STDOUT");
362 }
363}
364
365static void cgit_check_cache(struct cacheitem *item)
366{
367 int i = 0;
368
369 top:
370 if (++i > ctx.cfg.max_lock_attempts) {
371 die("cgit_refresh_cache: unable to lock %s: %s",
372 item->name, strerror(errno));
373 }
374 if (!cache_exist(item)) {
375 if (!cache_lock(item)) {
376 sleep(1);
377 goto top;
378 }
379 if (!cache_exist(item)) {
380 cgit_fill_cache(item, 1);
381 cache_unlock(item);
382 } else {
383 cache_cancel_lock(item);
384 }
385 } else if (cache_expired(item) && cache_lock(item)) {
386 if (cache_expired(item)) {
387 cgit_fill_cache(item, 1);
388 cache_unlock(item);
389 } else {
390 cache_cancel_lock(item);
391 }
392 }
393}
394
395static void cgit_print_cache(struct cacheitem *item)
396{
397 static char buf[4096];
398 ssize_t i;
399
400 int fd = open(item->name, O_RDONLY);
401 if (fd<0)
402 die("Unable to open cached file %s", item->name);
403
404 while((i=read(fd, buf, sizeof(buf))) > 0)
405 write(STDOUT_FILENO, buf, i);
406
407 close(fd);
408}
409
410static void cgit_parse_args(int argc, const char **argv)
411{
412 int i;
413
414 for (i = 1; i < argc; i++) {
415 if (!strncmp(argv[i], "--cache=", 8)) {
416 ctx.cfg.cache_root = xstrdup(argv[i]+8);
417 }
418 if (!strcmp(argv[i], "--nocache")) {
419 ctx.cfg.nocache = 1;
420 }
421 if (!strncmp(argv[i], "--query=", 8)) {
422 ctx.qry.raw = xstrdup(argv[i]+8);
423 }
424 if (!strncmp(argv[i], "--repo=", 7)) {
425 ctx.qry.repo = xstrdup(argv[i]+7);
426 }
427 if (!strncmp(argv[i], "--page=", 7)) {
428 ctx.qry.page = xstrdup(argv[i]+7);
429 }
430 if (!strncmp(argv[i], "--head=", 7)) {
431 ctx.qry.head = xstrdup(argv[i]+7);
432 ctx.qry.has_symref = 1;
433 }
434 if (!strncmp(argv[i], "--sha1=", 7)) {
435 ctx.qry.sha1 = xstrdup(argv[i]+7);
436 ctx.qry.has_sha1 = 1;
437 }
438 if (!strncmp(argv[i], "--ofs=", 6)) {
439 ctx.qry.ofs = atoi(argv[i]+6);
440 }
441 }
442}
443
444int main(int argc, const char **argv)
445{
446 struct cacheitem item;
447 const char *cgit_config_env = getenv("CGIT_CONFIG");
448
449 prepare_context(&ctx);
450 item.st.st_mtime = time(NULL);
451 cgit_repolist.length = 0;
452 cgit_repolist.count = 0;
453 cgit_repolist.repos = NULL;
454
455 parse_configfile(cgit_config_env ? cgit_config_env : CGIT_CONFIG,
456 config_cb);
457 ctx.repo = NULL;
458 if (getenv("SCRIPT_NAME"))
459 ctx.cfg.script_name = xstrdup(getenv("SCRIPT_NAME"));
460 if (getenv("QUERY_STRING"))
461 ctx.qry.raw = xstrdup(getenv("QUERY_STRING"));
462 cgit_parse_args(argc, argv);
463 http_parse_querystring(ctx.qry.raw, querystring_cb);
464 if (!cgit_prepare_cache(&item))
465 return 0;
466 if (ctx.cfg.nocache) {
467 cgit_fill_cache(&item, 0);
468 } else {
469 cgit_check_cache(&item);
470 cgit_print_cache(&item);
471 }
472 return 0;
473}