]> gitweb.ps.run Git - ps-cgit/blob - cgit.c
global: use release_commit_memory()
[ps-cgit] / cgit.c
1 /* cgit.c: cgi for the git scm
2  *
3  * Copyright (C) 2006-2014 cgit Development Team <cgit@lists.zx2c4.com>
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 #include "ui-stats.h"
16 #include "ui-blob.h"
17 #include "ui-summary.h"
18 #include "scan-tree.h"
19
20 const char *cgit_version = CGIT_VERSION;
21
22 __attribute__((constructor))
23 static void constructor_environment()
24 {
25         /* Do not look in /etc/ for gitconfig and gitattributes. */
26         setenv("GIT_CONFIG_NOSYSTEM", "1", 1);
27         setenv("GIT_ATTR_NOSYSTEM", "1", 1);
28         unsetenv("HOME");
29         unsetenv("XDG_CONFIG_HOME");
30 }
31
32 static void add_mimetype(const char *name, const char *value)
33 {
34         struct string_list_item *item;
35
36         item = string_list_insert(&ctx.cfg.mimetypes, name);
37         item->util = xstrdup(value);
38 }
39
40 static void process_cached_repolist(const char *path);
41
42 static void repo_config(struct cgit_repo *repo, const char *name, const char *value)
43 {
44         const char *path;
45         struct string_list_item *item;
46
47         if (!strcmp(name, "name"))
48                 repo->name = xstrdup(value);
49         else if (!strcmp(name, "clone-url"))
50                 repo->clone_url = xstrdup(value);
51         else if (!strcmp(name, "desc"))
52                 repo->desc = xstrdup(value);
53         else if (!strcmp(name, "owner"))
54                 repo->owner = xstrdup(value);
55         else if (!strcmp(name, "homepage"))
56                 repo->homepage = xstrdup(value);
57         else if (!strcmp(name, "defbranch"))
58                 repo->defbranch = xstrdup(value);
59         else if (!strcmp(name, "extra-head-content"))
60                 repo->extra_head_content = xstrdup(value);
61         else if (!strcmp(name, "snapshots"))
62                 repo->snapshots = ctx.cfg.snapshots & cgit_parse_snapshots_mask(value);
63         else if (!strcmp(name, "enable-blame"))
64                 repo->enable_blame = atoi(value);
65         else if (!strcmp(name, "enable-commit-graph"))
66                 repo->enable_commit_graph = atoi(value);
67         else if (!strcmp(name, "enable-log-filecount"))
68                 repo->enable_log_filecount = atoi(value);
69         else if (!strcmp(name, "enable-log-linecount"))
70                 repo->enable_log_linecount = atoi(value);
71         else if (!strcmp(name, "enable-remote-branches"))
72                 repo->enable_remote_branches = atoi(value);
73         else if (!strcmp(name, "enable-subject-links"))
74                 repo->enable_subject_links = atoi(value);
75         else if (!strcmp(name, "enable-html-serving"))
76                 repo->enable_html_serving = atoi(value);
77         else if (!strcmp(name, "branch-sort")) {
78                 if (!strcmp(value, "age"))
79                         repo->branch_sort = 1;
80                 if (!strcmp(value, "name"))
81                         repo->branch_sort = 0;
82         } else if (!strcmp(name, "commit-sort")) {
83                 if (!strcmp(value, "date"))
84                         repo->commit_sort = 1;
85                 if (!strcmp(value, "topo"))
86                         repo->commit_sort = 2;
87         } else if (!strcmp(name, "max-stats"))
88                 repo->max_stats = cgit_find_stats_period(value, NULL);
89         else if (!strcmp(name, "module-link"))
90                 repo->module_link= xstrdup(value);
91         else if (skip_prefix(name, "module-link.", &path)) {
92                 item = string_list_append(&repo->submodules, xstrdup(path));
93                 item->util = xstrdup(value);
94         } else if (!strcmp(name, "section"))
95                 repo->section = xstrdup(value);
96         else if (!strcmp(name, "snapshot-prefix"))
97                 repo->snapshot_prefix = xstrdup(value);
98         else if (!strcmp(name, "readme") && value != NULL) {
99                 if (repo->readme.items == ctx.cfg.readme.items)
100                         memset(&repo->readme, 0, sizeof(repo->readme));
101                 string_list_append(&repo->readme, xstrdup(value));
102         } else if (!strcmp(name, "logo") && value != NULL)
103                 repo->logo = xstrdup(value);
104         else if (!strcmp(name, "logo-link") && value != NULL)
105                 repo->logo_link = xstrdup(value);
106         else if (!strcmp(name, "hide"))
107                 repo->hide = atoi(value);
108         else if (!strcmp(name, "ignore"))
109                 repo->ignore = atoi(value);
110         else if (ctx.cfg.enable_filter_overrides) {
111                 if (!strcmp(name, "about-filter"))
112                         repo->about_filter = cgit_new_filter(value, ABOUT);
113                 else if (!strcmp(name, "commit-filter"))
114                         repo->commit_filter = cgit_new_filter(value, COMMIT);
115                 else if (!strcmp(name, "source-filter"))
116                         repo->source_filter = cgit_new_filter(value, SOURCE);
117                 else if (!strcmp(name, "email-filter"))
118                         repo->email_filter = cgit_new_filter(value, EMAIL);
119                 else if (!strcmp(name, "owner-filter"))
120                         repo->owner_filter = cgit_new_filter(value, OWNER);
121         }
122 }
123
124 static void config_cb(const char *name, const char *value)
125 {
126         const char *arg;
127
128         if (!strcmp(name, "section"))
129                 ctx.cfg.section = xstrdup(value);
130         else if (!strcmp(name, "repo.url"))
131                 ctx.repo = cgit_add_repo(value);
132         else if (ctx.repo && !strcmp(name, "repo.path"))
133                 ctx.repo->path = trim_end(value, '/');
134         else if (ctx.repo && skip_prefix(name, "repo.", &arg))
135                 repo_config(ctx.repo, arg, value);
136         else if (!strcmp(name, "readme"))
137                 string_list_append(&ctx.cfg.readme, xstrdup(value));
138         else if (!strcmp(name, "root-title"))
139                 ctx.cfg.root_title = xstrdup(value);
140         else if (!strcmp(name, "root-desc"))
141                 ctx.cfg.root_desc = xstrdup(value);
142         else if (!strcmp(name, "root-readme"))
143                 ctx.cfg.root_readme = xstrdup(value);
144         else if (!strcmp(name, "css"))
145                 ctx.cfg.css = xstrdup(value);
146         else if (!strcmp(name, "favicon"))
147                 ctx.cfg.favicon = xstrdup(value);
148         else if (!strcmp(name, "footer"))
149                 ctx.cfg.footer = xstrdup(value);
150         else if (!strcmp(name, "head-include"))
151                 ctx.cfg.head_include = xstrdup(value);
152         else if (!strcmp(name, "header"))
153                 ctx.cfg.header = xstrdup(value);
154         else if (!strcmp(name, "logo"))
155                 ctx.cfg.logo = xstrdup(value);
156         else if (!strcmp(name, "logo-link"))
157                 ctx.cfg.logo_link = xstrdup(value);
158         else if (!strcmp(name, "module-link"))
159                 ctx.cfg.module_link = xstrdup(value);
160         else if (!strcmp(name, "strict-export"))
161                 ctx.cfg.strict_export = xstrdup(value);
162         else if (!strcmp(name, "virtual-root"))
163                 ctx.cfg.virtual_root = ensure_end(value, '/');
164         else if (!strcmp(name, "noplainemail"))
165                 ctx.cfg.noplainemail = atoi(value);
166         else if (!strcmp(name, "noheader"))
167                 ctx.cfg.noheader = atoi(value);
168         else if (!strcmp(name, "snapshots"))
169                 ctx.cfg.snapshots = cgit_parse_snapshots_mask(value);
170         else if (!strcmp(name, "enable-filter-overrides"))
171                 ctx.cfg.enable_filter_overrides = atoi(value);
172         else if (!strcmp(name, "enable-follow-links"))
173                 ctx.cfg.enable_follow_links = atoi(value);
174         else if (!strcmp(name, "enable-http-clone"))
175                 ctx.cfg.enable_http_clone = atoi(value);
176         else if (!strcmp(name, "enable-index-links"))
177                 ctx.cfg.enable_index_links = atoi(value);
178         else if (!strcmp(name, "enable-index-owner"))
179                 ctx.cfg.enable_index_owner = atoi(value);
180         else if (!strcmp(name, "enable-blame"))
181                 ctx.cfg.enable_blame = atoi(value);
182         else if (!strcmp(name, "enable-commit-graph"))
183                 ctx.cfg.enable_commit_graph = atoi(value);
184         else if (!strcmp(name, "enable-log-filecount"))
185                 ctx.cfg.enable_log_filecount = atoi(value);
186         else if (!strcmp(name, "enable-log-linecount"))
187                 ctx.cfg.enable_log_linecount = atoi(value);
188         else if (!strcmp(name, "enable-remote-branches"))
189                 ctx.cfg.enable_remote_branches = atoi(value);
190         else if (!strcmp(name, "enable-subject-links"))
191                 ctx.cfg.enable_subject_links = atoi(value);
192         else if (!strcmp(name, "enable-html-serving"))
193                 ctx.cfg.enable_html_serving = atoi(value);
194         else if (!strcmp(name, "enable-tree-linenumbers"))
195                 ctx.cfg.enable_tree_linenumbers = atoi(value);
196         else if (!strcmp(name, "enable-git-config"))
197                 ctx.cfg.enable_git_config = atoi(value);
198         else if (!strcmp(name, "max-stats"))
199                 ctx.cfg.max_stats = cgit_find_stats_period(value, NULL);
200         else if (!strcmp(name, "cache-size"))
201                 ctx.cfg.cache_size = atoi(value);
202         else if (!strcmp(name, "cache-root"))
203                 ctx.cfg.cache_root = xstrdup(expand_macros(value));
204         else if (!strcmp(name, "cache-root-ttl"))
205                 ctx.cfg.cache_root_ttl = atoi(value);
206         else if (!strcmp(name, "cache-repo-ttl"))
207                 ctx.cfg.cache_repo_ttl = atoi(value);
208         else if (!strcmp(name, "cache-scanrc-ttl"))
209                 ctx.cfg.cache_scanrc_ttl = atoi(value);
210         else if (!strcmp(name, "cache-static-ttl"))
211                 ctx.cfg.cache_static_ttl = atoi(value);
212         else if (!strcmp(name, "cache-dynamic-ttl"))
213                 ctx.cfg.cache_dynamic_ttl = atoi(value);
214         else if (!strcmp(name, "cache-about-ttl"))
215                 ctx.cfg.cache_about_ttl = atoi(value);
216         else if (!strcmp(name, "cache-snapshot-ttl"))
217                 ctx.cfg.cache_snapshot_ttl = atoi(value);
218         else if (!strcmp(name, "case-sensitive-sort"))
219                 ctx.cfg.case_sensitive_sort = atoi(value);
220         else if (!strcmp(name, "about-filter"))
221                 ctx.cfg.about_filter = cgit_new_filter(value, ABOUT);
222         else if (!strcmp(name, "commit-filter"))
223                 ctx.cfg.commit_filter = cgit_new_filter(value, COMMIT);
224         else if (!strcmp(name, "email-filter"))
225                 ctx.cfg.email_filter = cgit_new_filter(value, EMAIL);
226         else if (!strcmp(name, "owner-filter"))
227                 ctx.cfg.owner_filter = cgit_new_filter(value, OWNER);
228         else if (!strcmp(name, "auth-filter"))
229                 ctx.cfg.auth_filter = cgit_new_filter(value, AUTH);
230         else if (!strcmp(name, "embedded"))
231                 ctx.cfg.embedded = atoi(value);
232         else if (!strcmp(name, "max-atom-items"))
233                 ctx.cfg.max_atom_items = atoi(value);
234         else if (!strcmp(name, "max-message-length"))
235                 ctx.cfg.max_msg_len = atoi(value);
236         else if (!strcmp(name, "max-repodesc-length"))
237                 ctx.cfg.max_repodesc_len = atoi(value);
238         else if (!strcmp(name, "max-blob-size"))
239                 ctx.cfg.max_blob_size = atoi(value);
240         else if (!strcmp(name, "max-repo-count"))
241                 ctx.cfg.max_repo_count = atoi(value);
242         else if (!strcmp(name, "max-commit-count"))
243                 ctx.cfg.max_commit_count = atoi(value);
244         else if (!strcmp(name, "project-list"))
245                 ctx.cfg.project_list = xstrdup(expand_macros(value));
246         else if (!strcmp(name, "scan-path"))
247                 if (ctx.cfg.cache_size)
248                         process_cached_repolist(expand_macros(value));
249                 else if (ctx.cfg.project_list)
250                         scan_projects(expand_macros(value),
251                                       ctx.cfg.project_list, repo_config);
252                 else
253                         scan_tree(expand_macros(value), repo_config);
254         else if (!strcmp(name, "scan-hidden-path"))
255                 ctx.cfg.scan_hidden_path = atoi(value);
256         else if (!strcmp(name, "section-from-path"))
257                 ctx.cfg.section_from_path = atoi(value);
258         else if (!strcmp(name, "repository-sort"))
259                 ctx.cfg.repository_sort = xstrdup(value);
260         else if (!strcmp(name, "section-sort"))
261                 ctx.cfg.section_sort = atoi(value);
262         else if (!strcmp(name, "source-filter"))
263                 ctx.cfg.source_filter = cgit_new_filter(value, SOURCE);
264         else if (!strcmp(name, "summary-log"))
265                 ctx.cfg.summary_log = atoi(value);
266         else if (!strcmp(name, "summary-branches"))
267                 ctx.cfg.summary_branches = atoi(value);
268         else if (!strcmp(name, "summary-tags"))
269                 ctx.cfg.summary_tags = atoi(value);
270         else if (!strcmp(name, "side-by-side-diffs"))
271                 ctx.cfg.difftype = atoi(value) ? DIFF_SSDIFF : DIFF_UNIFIED;
272         else if (!strcmp(name, "agefile"))
273                 ctx.cfg.agefile = xstrdup(value);
274         else if (!strcmp(name, "mimetype-file"))
275                 ctx.cfg.mimetype_file = xstrdup(value);
276         else if (!strcmp(name, "renamelimit"))
277                 ctx.cfg.renamelimit = atoi(value);
278         else if (!strcmp(name, "remove-suffix"))
279                 ctx.cfg.remove_suffix = atoi(value);
280         else if (!strcmp(name, "robots"))
281                 ctx.cfg.robots = xstrdup(value);
282         else if (!strcmp(name, "clone-prefix"))
283                 ctx.cfg.clone_prefix = xstrdup(value);
284         else if (!strcmp(name, "clone-url"))
285                 ctx.cfg.clone_url = xstrdup(value);
286         else if (!strcmp(name, "local-time"))
287                 ctx.cfg.local_time = atoi(value);
288         else if (!strcmp(name, "commit-sort")) {
289                 if (!strcmp(value, "date"))
290                         ctx.cfg.commit_sort = 1;
291                 if (!strcmp(value, "topo"))
292                         ctx.cfg.commit_sort = 2;
293         } else if (!strcmp(name, "branch-sort")) {
294                 if (!strcmp(value, "age"))
295                         ctx.cfg.branch_sort = 1;
296                 if (!strcmp(value, "name"))
297                         ctx.cfg.branch_sort = 0;
298         } else if (skip_prefix(name, "mimetype.", &arg))
299                 add_mimetype(arg, value);
300         else if (!strcmp(name, "include"))
301                 parse_configfile(expand_macros(value), config_cb);
302 }
303
304 static void querystring_cb(const char *name, const char *value)
305 {
306         if (!value)
307                 value = "";
308
309         if (!strcmp(name,"r")) {
310                 ctx.qry.repo = xstrdup(value);
311                 ctx.repo = cgit_get_repoinfo(value);
312         } else if (!strcmp(name, "p")) {
313                 ctx.qry.page = xstrdup(value);
314         } else if (!strcmp(name, "url")) {
315                 if (*value == '/')
316                         value++;
317                 ctx.qry.url = xstrdup(value);
318                 cgit_parse_url(value);
319         } else if (!strcmp(name, "qt")) {
320                 ctx.qry.grep = xstrdup(value);
321         } else if (!strcmp(name, "q")) {
322                 ctx.qry.search = xstrdup(value);
323         } else if (!strcmp(name, "h")) {
324                 ctx.qry.head = xstrdup(value);
325                 ctx.qry.has_symref = 1;
326         } else if (!strcmp(name, "id")) {
327                 ctx.qry.oid = xstrdup(value);
328                 ctx.qry.has_oid = 1;
329         } else if (!strcmp(name, "id2")) {
330                 ctx.qry.oid2 = xstrdup(value);
331                 ctx.qry.has_oid = 1;
332         } else if (!strcmp(name, "ofs")) {
333                 ctx.qry.ofs = atoi(value);
334         } else if (!strcmp(name, "path")) {
335                 ctx.qry.path = trim_end(value, '/');
336         } else if (!strcmp(name, "name")) {
337                 ctx.qry.name = xstrdup(value);
338         } else if (!strcmp(name, "s")) {
339                 ctx.qry.sort = xstrdup(value);
340         } else if (!strcmp(name, "showmsg")) {
341                 ctx.qry.showmsg = atoi(value);
342         } else if (!strcmp(name, "period")) {
343                 ctx.qry.period = xstrdup(value);
344         } else if (!strcmp(name, "dt")) {
345                 ctx.qry.difftype = atoi(value);
346                 ctx.qry.has_difftype = 1;
347         } else if (!strcmp(name, "ss")) {
348                 /* No longer generated, but there may be links out there. */
349                 ctx.qry.difftype = atoi(value) ? DIFF_SSDIFF : DIFF_UNIFIED;
350                 ctx.qry.has_difftype = 1;
351         } else if (!strcmp(name, "all")) {
352                 ctx.qry.show_all = atoi(value);
353         } else if (!strcmp(name, "context")) {
354                 ctx.qry.context = atoi(value);
355         } else if (!strcmp(name, "ignorews")) {
356                 ctx.qry.ignorews = atoi(value);
357         } else if (!strcmp(name, "follow")) {
358                 ctx.qry.follow = atoi(value);
359         }
360 }
361
362 static void prepare_context(void)
363 {
364         memset(&ctx, 0, sizeof(ctx));
365         ctx.cfg.agefile = "info/web/last-modified";
366         ctx.cfg.cache_size = 0;
367         ctx.cfg.cache_max_create_time = 5;
368         ctx.cfg.cache_root = CGIT_CACHE_ROOT;
369         ctx.cfg.cache_about_ttl = 15;
370         ctx.cfg.cache_snapshot_ttl = 5;
371         ctx.cfg.cache_repo_ttl = 5;
372         ctx.cfg.cache_root_ttl = 5;
373         ctx.cfg.cache_scanrc_ttl = 15;
374         ctx.cfg.cache_dynamic_ttl = 5;
375         ctx.cfg.cache_static_ttl = -1;
376         ctx.cfg.case_sensitive_sort = 1;
377         ctx.cfg.branch_sort = 0;
378         ctx.cfg.commit_sort = 0;
379         ctx.cfg.css = "/cgit.css";
380         ctx.cfg.logo = "/cgit.png";
381         ctx.cfg.favicon = "/favicon.ico";
382         ctx.cfg.local_time = 0;
383         ctx.cfg.enable_http_clone = 1;
384         ctx.cfg.enable_index_owner = 1;
385         ctx.cfg.enable_tree_linenumbers = 1;
386         ctx.cfg.enable_git_config = 0;
387         ctx.cfg.max_repo_count = 50;
388         ctx.cfg.max_commit_count = 50;
389         ctx.cfg.max_lock_attempts = 5;
390         ctx.cfg.max_msg_len = 80;
391         ctx.cfg.max_repodesc_len = 80;
392         ctx.cfg.max_blob_size = 0;
393         ctx.cfg.max_stats = 0;
394         ctx.cfg.project_list = NULL;
395         ctx.cfg.renamelimit = -1;
396         ctx.cfg.remove_suffix = 0;
397         ctx.cfg.robots = "index, nofollow";
398         ctx.cfg.root_title = "Git repository browser";
399         ctx.cfg.root_desc = "a fast webinterface for the git dscm";
400         ctx.cfg.scan_hidden_path = 0;
401         ctx.cfg.script_name = CGIT_SCRIPT_NAME;
402         ctx.cfg.section = "";
403         ctx.cfg.repository_sort = "name";
404         ctx.cfg.section_sort = 1;
405         ctx.cfg.summary_branches = 10;
406         ctx.cfg.summary_log = 10;
407         ctx.cfg.summary_tags = 10;
408         ctx.cfg.max_atom_items = 10;
409         ctx.cfg.difftype = DIFF_UNIFIED;
410         ctx.env.cgit_config = getenv("CGIT_CONFIG");
411         ctx.env.http_host = getenv("HTTP_HOST");
412         ctx.env.https = getenv("HTTPS");
413         ctx.env.no_http = getenv("NO_HTTP");
414         ctx.env.path_info = getenv("PATH_INFO");
415         ctx.env.query_string = getenv("QUERY_STRING");
416         ctx.env.request_method = getenv("REQUEST_METHOD");
417         ctx.env.script_name = getenv("SCRIPT_NAME");
418         ctx.env.server_name = getenv("SERVER_NAME");
419         ctx.env.server_port = getenv("SERVER_PORT");
420         ctx.env.http_cookie = getenv("HTTP_COOKIE");
421         ctx.env.http_referer = getenv("HTTP_REFERER");
422         ctx.env.content_length = getenv("CONTENT_LENGTH") ? strtoul(getenv("CONTENT_LENGTH"), NULL, 10) : 0;
423         ctx.env.authenticated = 0;
424         ctx.page.mimetype = "text/html";
425         ctx.page.charset = PAGE_ENCODING;
426         ctx.page.filename = NULL;
427         ctx.page.size = 0;
428         ctx.page.modified = time(NULL);
429         ctx.page.expires = ctx.page.modified;
430         ctx.page.etag = NULL;
431         string_list_init_dup(&ctx.cfg.mimetypes);
432         if (ctx.env.script_name)
433                 ctx.cfg.script_name = xstrdup(ctx.env.script_name);
434         if (ctx.env.query_string)
435                 ctx.qry.raw = xstrdup(ctx.env.query_string);
436         if (!ctx.env.cgit_config)
437                 ctx.env.cgit_config = CGIT_CONFIG;
438 }
439
440 struct refmatch {
441         char *req_ref;
442         char *first_ref;
443         int match;
444 };
445
446 static int find_current_ref(const char *refname, const struct object_id *oid,
447                             int flags, void *cb_data)
448 {
449         struct refmatch *info;
450
451         info = (struct refmatch *)cb_data;
452         if (!strcmp(refname, info->req_ref))
453                 info->match = 1;
454         if (!info->first_ref)
455                 info->first_ref = xstrdup(refname);
456         return info->match;
457 }
458
459 static void free_refmatch_inner(struct refmatch *info)
460 {
461         if (info->first_ref)
462                 free(info->first_ref);
463 }
464
465 static char *find_default_branch(struct cgit_repo *repo)
466 {
467         struct refmatch info;
468         char *ref;
469
470         info.req_ref = repo->defbranch;
471         info.first_ref = NULL;
472         info.match = 0;
473         for_each_branch_ref(find_current_ref, &info);
474         if (info.match)
475                 ref = info.req_ref;
476         else
477                 ref = info.first_ref;
478         if (ref)
479                 ref = xstrdup(ref);
480         free_refmatch_inner(&info);
481
482         return ref;
483 }
484
485 static char *guess_defbranch(void)
486 {
487         const char *ref, *refname;
488         struct object_id oid;
489
490         ref = resolve_ref_unsafe("HEAD", 0, &oid, NULL);
491         if (!ref || !skip_prefix(ref, "refs/heads/", &refname))
492                 return "master";
493         return xstrdup(refname);
494 }
495
496 /* The caller must free filename and ref after calling this. */
497 static inline void parse_readme(const char *readme, char **filename, char **ref, struct cgit_repo *repo)
498 {
499         const char *colon;
500
501         *filename = NULL;
502         *ref = NULL;
503
504         if (!readme || !readme[0])
505                 return;
506
507         /* Check if the readme is tracked in the git repo. */
508         colon = strchr(readme, ':');
509         if (colon && strlen(colon) > 1) {
510                 /* If it starts with a colon, we want to use head given
511                  * from query or the default branch */
512                 if (colon == readme && ctx.qry.head)
513                         *ref = xstrdup(ctx.qry.head);
514                 else if (colon == readme && repo->defbranch)
515                         *ref = xstrdup(repo->defbranch);
516                 else
517                         *ref = xstrndup(readme, colon - readme);
518                 readme = colon + 1;
519         }
520
521         /* Prepend repo path to relative readme path unless tracked. */
522         if (!(*ref) && readme[0] != '/')
523                 *filename = fmtalloc("%s/%s", repo->path, readme);
524         else
525                 *filename = xstrdup(readme);
526 }
527 static void choose_readme(struct cgit_repo *repo)
528 {
529         int found;
530         char *filename, *ref;
531         struct string_list_item *entry;
532
533         if (!repo->readme.nr)
534                 return;
535
536         found = 0;
537         for_each_string_list_item(entry, &repo->readme) {
538                 parse_readme(entry->string, &filename, &ref, repo);
539                 if (!filename) {
540                         free(filename);
541                         free(ref);
542                         continue;
543                 }
544                 if (ref) {
545                         if (cgit_ref_path_exists(filename, ref, 1)) {
546                                 found = 1;
547                                 break;
548                         }
549                 }
550                 else if (!access(filename, R_OK)) {
551                         found = 1;
552                         break;
553                 }
554                 free(filename);
555                 free(ref);
556         }
557         repo->readme.strdup_strings = 1;
558         string_list_clear(&repo->readme, 0);
559         repo->readme.strdup_strings = 0;
560         if (found)
561                 string_list_append(&repo->readme, filename)->util = ref;
562 }
563
564 static void print_no_repo_clone_urls(const char *url)
565 {
566         html("<tr><td><a rel='vcs-git' href='");
567         html_url_path(url);
568         html("' title='");
569         html_attr(ctx.repo->name);
570         html(" Git repository'>");
571         html_txt(url);
572         html("</a></td></tr>\n");
573 }
574
575 static void prepare_repo_env(int *nongit)
576 {
577         /* The path to the git repository. */
578         setenv("GIT_DIR", ctx.repo->path, 1);
579
580         /* Setup the git directory and initialize the notes system. Both of these
581          * load local configuration from the git repository, so we do them both while
582          * the HOME variables are unset. */
583         setup_git_directory_gently(nongit);
584         load_display_notes(NULL);
585 }
586
587 static int prepare_repo_cmd(int nongit)
588 {
589         struct object_id oid;
590         int rc;
591
592         if (nongit) {
593                 const char *name = ctx.repo->name;
594                 rc = errno;
595                 ctx.page.title = fmtalloc("%s - %s", ctx.cfg.root_title,
596                                                 "config error");
597                 ctx.repo = NULL;
598                 cgit_print_http_headers();
599                 cgit_print_docstart();
600                 cgit_print_pageheader();
601                 cgit_print_error("Failed to open %s: %s", name,
602                                  rc ? strerror(rc) : "Not a valid git repository");
603                 cgit_print_docend();
604                 return 1;
605         }
606         ctx.page.title = fmtalloc("%s - %s", ctx.repo->name, ctx.repo->desc);
607
608         if (!ctx.repo->defbranch)
609                 ctx.repo->defbranch = guess_defbranch();
610
611         if (!ctx.qry.head) {
612                 ctx.qry.nohead = 1;
613                 ctx.qry.head = find_default_branch(ctx.repo);
614         }
615
616         if (!ctx.qry.head) {
617                 cgit_print_http_headers();
618                 cgit_print_docstart();
619                 cgit_print_pageheader();
620                 cgit_print_error("Repository seems to be empty");
621                 if (!strcmp(ctx.qry.page, "summary")) {
622                         html("<table class='list'><tr class='nohover'><td>&nbsp;</td></tr><tr class='nohover'><th class='left'>Clone</th></tr>\n");
623                         cgit_prepare_repo_env(ctx.repo);
624                         cgit_add_clone_urls(print_no_repo_clone_urls);
625                         html("</table>\n");
626                 }
627                 cgit_print_docend();
628                 return 1;
629         }
630
631         if (get_oid(ctx.qry.head, &oid)) {
632                 char *old_head = ctx.qry.head;
633                 ctx.qry.head = xstrdup(ctx.repo->defbranch);
634                 cgit_print_error_page(404, "Not found",
635                                 "Invalid branch: %s", old_head);
636                 free(old_head);
637                 return 1;
638         }
639         string_list_sort(&ctx.repo->submodules);
640         cgit_prepare_repo_env(ctx.repo);
641         choose_readme(ctx.repo);
642         return 0;
643 }
644
645 static inline void open_auth_filter(const char *function)
646 {
647         cgit_open_filter(ctx.cfg.auth_filter, function,
648                 ctx.env.http_cookie ? ctx.env.http_cookie : "",
649                 ctx.env.request_method ? ctx.env.request_method : "",
650                 ctx.env.query_string ? ctx.env.query_string : "",
651                 ctx.env.http_referer ? ctx.env.http_referer : "",
652                 ctx.env.path_info ? ctx.env.path_info : "",
653                 ctx.env.http_host ? ctx.env.http_host : "",
654                 ctx.env.https ? ctx.env.https : "",
655                 ctx.qry.repo ? ctx.qry.repo : "",
656                 ctx.qry.page ? ctx.qry.page : "",
657                 cgit_currentfullurl(),
658                 cgit_loginurl());
659 }
660
661 /* We intentionally keep this rather small, instead of looping and
662  * feeding it to the filter a couple bytes at a time. This way, the
663  * filter itself does not need to handle any denial of service or
664  * buffer bloat issues. If this winds up being too small, people
665  * will complain on the mailing list, and we'll increase it as needed. */
666 #define MAX_AUTHENTICATION_POST_BYTES 4096
667 /* The filter is expected to spit out "Status: " and all headers. */
668 static inline void authenticate_post(void)
669 {
670         char buffer[MAX_AUTHENTICATION_POST_BYTES];
671         ssize_t len;
672
673         open_auth_filter("authenticate-post");
674         len = ctx.env.content_length;
675         if (len > MAX_AUTHENTICATION_POST_BYTES)
676                 len = MAX_AUTHENTICATION_POST_BYTES;
677         if ((len = read(STDIN_FILENO, buffer, len)) < 0)
678                 die_errno("Could not read POST from stdin");
679         if (write(STDOUT_FILENO, buffer, len) < 0)
680                 die_errno("Could not write POST to stdout");
681         cgit_close_filter(ctx.cfg.auth_filter);
682         exit(0);
683 }
684
685 static inline void authenticate_cookie(void)
686 {
687         /* If we don't have an auth_filter, consider all cookies valid, and thus return early. */
688         if (!ctx.cfg.auth_filter) {
689                 ctx.env.authenticated = 1;
690                 return;
691         }
692
693         /* If we're having something POST'd to /login, we're authenticating POST,
694          * instead of the cookie, so call authenticate_post and bail out early.
695          * This pattern here should match /?p=login with POST. */
696         if (ctx.env.request_method && ctx.qry.page && !ctx.repo && \
697             !strcmp(ctx.env.request_method, "POST") && !strcmp(ctx.qry.page, "login")) {
698                 authenticate_post();
699                 return;
700         }
701
702         /* If we've made it this far, we're authenticating the cookie for real, so do that. */
703         open_auth_filter("authenticate-cookie");
704         ctx.env.authenticated = cgit_close_filter(ctx.cfg.auth_filter);
705 }
706
707 static void process_request(void)
708 {
709         struct cgit_cmd *cmd;
710         int nongit = 0;
711
712         /* If we're not yet authenticated, no matter what page we're on,
713          * display the authentication body from the auth_filter. This should
714          * never be cached. */
715         if (!ctx.env.authenticated) {
716                 ctx.page.title = "Authentication Required";
717                 cgit_print_http_headers();
718                 cgit_print_docstart();
719                 cgit_print_pageheader();
720                 open_auth_filter("body");
721                 cgit_close_filter(ctx.cfg.auth_filter);
722                 cgit_print_docend();
723                 return;
724         }
725
726         if (ctx.repo)
727                 prepare_repo_env(&nongit);
728
729         cmd = cgit_get_cmd();
730         if (!cmd) {
731                 ctx.page.title = "cgit error";
732                 cgit_print_error_page(404, "Not found", "Invalid request");
733                 return;
734         }
735
736         if (!ctx.cfg.enable_http_clone && cmd->is_clone) {
737                 ctx.page.title = "cgit error";
738                 cgit_print_error_page(404, "Not found", "Invalid request");
739                 return;
740         }
741
742         if (cmd->want_repo && !ctx.repo) {
743                 cgit_print_error_page(400, "Bad request",
744                                 "No repository selected");
745                 return;
746         }
747
748         /* If cmd->want_vpath is set, assume ctx.qry.path contains a "virtual"
749          * in-project path limit to be made available at ctx.qry.vpath.
750          * Otherwise, no path limit is in effect (ctx.qry.vpath = NULL).
751          */
752         ctx.qry.vpath = cmd->want_vpath ? ctx.qry.path : NULL;
753
754         if (ctx.repo && prepare_repo_cmd(nongit))
755                 return;
756
757         cmd->fn();
758 }
759
760 static int cmp_repos(const void *a, const void *b)
761 {
762         const struct cgit_repo *ra = a, *rb = b;
763         return strcmp(ra->url, rb->url);
764 }
765
766 static char *build_snapshot_setting(int bitmap)
767 {
768         const struct cgit_snapshot_format *f;
769         struct strbuf result = STRBUF_INIT;
770
771         for (f = cgit_snapshot_formats; f->suffix; f++) {
772                 if (cgit_snapshot_format_bit(f) & bitmap) {
773                         if (result.len)
774                                 strbuf_addch(&result, ' ');
775                         strbuf_addstr(&result, f->suffix);
776                 }
777         }
778         return strbuf_detach(&result, NULL);
779 }
780
781 static char *get_first_line(char *txt)
782 {
783         char *t = xstrdup(txt);
784         char *p = strchr(t, '\n');
785         if (p)
786                 *p = '\0';
787         return t;
788 }
789
790 static void print_repo(FILE *f, struct cgit_repo *repo)
791 {
792         struct string_list_item *item;
793         fprintf(f, "repo.url=%s\n", repo->url);
794         fprintf(f, "repo.name=%s\n", repo->name);
795         fprintf(f, "repo.path=%s\n", repo->path);
796         if (repo->owner)
797                 fprintf(f, "repo.owner=%s\n", repo->owner);
798         if (repo->desc) {
799                 char *tmp = get_first_line(repo->desc);
800                 fprintf(f, "repo.desc=%s\n", tmp);
801                 free(tmp);
802         }
803         for_each_string_list_item(item, &repo->readme) {
804                 if (item->util)
805                         fprintf(f, "repo.readme=%s:%s\n", (char *)item->util, item->string);
806                 else
807                         fprintf(f, "repo.readme=%s\n", item->string);
808         }
809         if (repo->defbranch)
810                 fprintf(f, "repo.defbranch=%s\n", repo->defbranch);
811         if (repo->extra_head_content)
812                 fprintf(f, "repo.extra-head-content=%s\n", repo->extra_head_content);
813         if (repo->module_link)
814                 fprintf(f, "repo.module-link=%s\n", repo->module_link);
815         if (repo->section)
816                 fprintf(f, "repo.section=%s\n", repo->section);
817         if (repo->homepage)
818                 fprintf(f, "repo.homepage=%s\n", repo->homepage);
819         if (repo->clone_url)
820                 fprintf(f, "repo.clone-url=%s\n", repo->clone_url);
821         fprintf(f, "repo.enable-blame=%d\n",
822                 repo->enable_blame);
823         fprintf(f, "repo.enable-commit-graph=%d\n",
824                 repo->enable_commit_graph);
825         fprintf(f, "repo.enable-log-filecount=%d\n",
826                 repo->enable_log_filecount);
827         fprintf(f, "repo.enable-log-linecount=%d\n",
828                 repo->enable_log_linecount);
829         if (repo->about_filter && repo->about_filter != ctx.cfg.about_filter)
830                 cgit_fprintf_filter(repo->about_filter, f, "repo.about-filter=");
831         if (repo->commit_filter && repo->commit_filter != ctx.cfg.commit_filter)
832                 cgit_fprintf_filter(repo->commit_filter, f, "repo.commit-filter=");
833         if (repo->source_filter && repo->source_filter != ctx.cfg.source_filter)
834                 cgit_fprintf_filter(repo->source_filter, f, "repo.source-filter=");
835         if (repo->email_filter && repo->email_filter != ctx.cfg.email_filter)
836                 cgit_fprintf_filter(repo->email_filter, f, "repo.email-filter=");
837         if (repo->owner_filter && repo->owner_filter != ctx.cfg.owner_filter)
838                 cgit_fprintf_filter(repo->owner_filter, f, "repo.owner-filter=");
839         if (repo->snapshots != ctx.cfg.snapshots) {
840                 char *tmp = build_snapshot_setting(repo->snapshots);
841                 fprintf(f, "repo.snapshots=%s\n", tmp ? tmp : "");
842                 free(tmp);
843         }
844         if (repo->snapshot_prefix)
845                 fprintf(f, "repo.snapshot-prefix=%s\n", repo->snapshot_prefix);
846         if (repo->max_stats != ctx.cfg.max_stats)
847                 fprintf(f, "repo.max-stats=%s\n",
848                         cgit_find_stats_periodname(repo->max_stats));
849         if (repo->logo)
850                 fprintf(f, "repo.logo=%s\n", repo->logo);
851         if (repo->logo_link)
852                 fprintf(f, "repo.logo-link=%s\n", repo->logo_link);
853         fprintf(f, "repo.enable-remote-branches=%d\n", repo->enable_remote_branches);
854         fprintf(f, "repo.enable-subject-links=%d\n", repo->enable_subject_links);
855         fprintf(f, "repo.enable-html-serving=%d\n", repo->enable_html_serving);
856         if (repo->branch_sort == 1)
857                 fprintf(f, "repo.branch-sort=age\n");
858         if (repo->commit_sort) {
859                 if (repo->commit_sort == 1)
860                         fprintf(f, "repo.commit-sort=date\n");
861                 else if (repo->commit_sort == 2)
862                         fprintf(f, "repo.commit-sort=topo\n");
863         }
864         fprintf(f, "repo.hide=%d\n", repo->hide);
865         fprintf(f, "repo.ignore=%d\n", repo->ignore);
866         fprintf(f, "\n");
867 }
868
869 static void print_repolist(FILE *f, struct cgit_repolist *list, int start)
870 {
871         int i;
872
873         for (i = start; i < list->count; i++)
874                 print_repo(f, &list->repos[i]);
875 }
876
877 /* Scan 'path' for git repositories, save the resulting repolist in 'cached_rc'
878  * and return 0 on success.
879  */
880 static int generate_cached_repolist(const char *path, const char *cached_rc)
881 {
882         struct strbuf locked_rc = STRBUF_INIT;
883         int result = 0;
884         int idx;
885         FILE *f;
886
887         strbuf_addf(&locked_rc, "%s.lock", cached_rc);
888         f = fopen(locked_rc.buf, "wx");
889         if (!f) {
890                 /* Inform about the error unless the lockfile already existed,
891                  * since that only means we've got concurrent requests.
892                  */
893                 result = errno;
894                 if (result != EEXIST)
895                         fprintf(stderr, "[cgit] Error opening %s: %s (%d)\n",
896                                 locked_rc.buf, strerror(result), result);
897                 goto out;
898         }
899         idx = cgit_repolist.count;
900         if (ctx.cfg.project_list)
901                 scan_projects(path, ctx.cfg.project_list, repo_config);
902         else
903                 scan_tree(path, repo_config);
904         print_repolist(f, &cgit_repolist, idx);
905         if (rename(locked_rc.buf, cached_rc))
906                 fprintf(stderr, "[cgit] Error renaming %s to %s: %s (%d)\n",
907                         locked_rc.buf, cached_rc, strerror(errno), errno);
908         fclose(f);
909 out:
910         strbuf_release(&locked_rc);
911         return result;
912 }
913
914 static void process_cached_repolist(const char *path)
915 {
916         struct stat st;
917         struct strbuf cached_rc = STRBUF_INIT;
918         time_t age;
919         unsigned long hash;
920
921         hash = hash_str(path);
922         if (ctx.cfg.project_list)
923                 hash += hash_str(ctx.cfg.project_list);
924         strbuf_addf(&cached_rc, "%s/rc-%8lx", ctx.cfg.cache_root, hash);
925
926         if (stat(cached_rc.buf, &st)) {
927                 /* Nothing is cached, we need to scan without forking. And
928                  * if we fail to generate a cached repolist, we need to
929                  * invoke scan_tree manually.
930                  */
931                 if (generate_cached_repolist(path, cached_rc.buf)) {
932                         if (ctx.cfg.project_list)
933                                 scan_projects(path, ctx.cfg.project_list,
934                                               repo_config);
935                         else
936                                 scan_tree(path, repo_config);
937                 }
938                 goto out;
939         }
940
941         parse_configfile(cached_rc.buf, config_cb);
942
943         /* If the cached configfile hasn't expired, lets exit now */
944         age = time(NULL) - st.st_mtime;
945         if (age <= (ctx.cfg.cache_scanrc_ttl * 60))
946                 goto out;
947
948         /* The cached repolist has been parsed, but it was old. So lets
949          * rescan the specified path and generate a new cached repolist
950          * in a child-process to avoid latency for the current request.
951          */
952         if (fork())
953                 goto out;
954
955         exit(generate_cached_repolist(path, cached_rc.buf));
956 out:
957         strbuf_release(&cached_rc);
958 }
959
960 static void cgit_parse_args(int argc, const char **argv)
961 {
962         int i;
963         const char *arg;
964         int scan = 0;
965
966         for (i = 1; i < argc; i++) {
967                 if (!strcmp(argv[i], "--version")) {
968                         printf("CGit %s | https://git.zx2c4.com/cgit/\n\nCompiled in features:\n", CGIT_VERSION);
969 #ifdef NO_LUA
970                         printf("[-] ");
971 #else
972                         printf("[+] ");
973 #endif
974                         printf("Lua scripting\n");
975 #ifndef HAVE_LINUX_SENDFILE
976                         printf("[-] ");
977 #else
978                         printf("[+] ");
979 #endif
980                         printf("Linux sendfile() usage\n");
981
982                         exit(0);
983                 }
984                 if (skip_prefix(argv[i], "--cache=", &arg)) {
985                         ctx.cfg.cache_root = xstrdup(arg);
986                 } else if (!strcmp(argv[i], "--nohttp")) {
987                         ctx.env.no_http = "1";
988                 } else if (skip_prefix(argv[i], "--query=", &arg)) {
989                         ctx.qry.raw = xstrdup(arg);
990                 } else if (skip_prefix(argv[i], "--repo=", &arg)) {
991                         ctx.qry.repo = xstrdup(arg);
992                 } else if (skip_prefix(argv[i], "--page=", &arg)) {
993                         ctx.qry.page = xstrdup(arg);
994                 } else if (skip_prefix(argv[i], "--head=", &arg)) {
995                         ctx.qry.head = xstrdup(arg);
996                         ctx.qry.has_symref = 1;
997                 } else if (skip_prefix(argv[i], "--oid=", &arg)) {
998                         ctx.qry.oid = xstrdup(arg);
999                         ctx.qry.has_oid = 1;
1000                 } else if (skip_prefix(argv[i], "--ofs=", &arg)) {
1001                         ctx.qry.ofs = atoi(arg);
1002                 } else if (skip_prefix(argv[i], "--scan-tree=", &arg) ||
1003                            skip_prefix(argv[i], "--scan-path=", &arg)) {
1004                         /*
1005                          * HACK: The global snapshot bit mask defines the set
1006                          * of allowed snapshot formats, but the config file
1007                          * hasn't been parsed yet so the mask is currently 0.
1008                          * By setting all bits high before scanning we make
1009                          * sure that any in-repo cgitrc snapshot setting is
1010                          * respected by scan_tree().
1011                          *
1012                          * NOTE: We assume that there aren't more than 8
1013                          * different snapshot formats supported by cgit...
1014                          */
1015                         ctx.cfg.snapshots = 0xFF;
1016                         scan++;
1017                         scan_tree(arg, repo_config);
1018                 }
1019         }
1020         if (scan) {
1021                 qsort(cgit_repolist.repos, cgit_repolist.count,
1022                         sizeof(struct cgit_repo), cmp_repos);
1023                 print_repolist(stdout, &cgit_repolist, 0);
1024                 exit(0);
1025         }
1026 }
1027
1028 static int calc_ttl(void)
1029 {
1030         if (!ctx.repo)
1031                 return ctx.cfg.cache_root_ttl;
1032
1033         if (!ctx.qry.page)
1034                 return ctx.cfg.cache_repo_ttl;
1035
1036         if (!strcmp(ctx.qry.page, "about"))
1037                 return ctx.cfg.cache_about_ttl;
1038
1039         if (!strcmp(ctx.qry.page, "snapshot"))
1040                 return ctx.cfg.cache_snapshot_ttl;
1041
1042         if (ctx.qry.has_oid)
1043                 return ctx.cfg.cache_static_ttl;
1044
1045         if (ctx.qry.has_symref)
1046                 return ctx.cfg.cache_dynamic_ttl;
1047
1048         return ctx.cfg.cache_repo_ttl;
1049 }
1050
1051 int cmd_main(int argc, const char **argv)
1052 {
1053         const char *path;
1054         int err, ttl;
1055
1056         cgit_init_filters();
1057         atexit(cgit_cleanup_filters);
1058
1059         prepare_context();
1060         cgit_repolist.length = 0;
1061         cgit_repolist.count = 0;
1062         cgit_repolist.repos = NULL;
1063
1064         cgit_parse_args(argc, argv);
1065         parse_configfile(expand_macros(ctx.env.cgit_config), config_cb);
1066         ctx.repo = NULL;
1067         http_parse_querystring(ctx.qry.raw, querystring_cb);
1068
1069         /* If virtual-root isn't specified in cgitrc, lets pretend
1070          * that virtual-root equals SCRIPT_NAME, minus any possibly
1071          * trailing slashes.
1072          */
1073         if (!ctx.cfg.virtual_root && ctx.cfg.script_name)
1074                 ctx.cfg.virtual_root = ensure_end(ctx.cfg.script_name, '/');
1075
1076         /* If no url parameter is specified on the querystring, lets
1077          * use PATH_INFO as url. This allows cgit to work with virtual
1078          * urls without the need for rewriterules in the webserver (as
1079          * long as PATH_INFO is included in the cache lookup key).
1080          */
1081         path = ctx.env.path_info;
1082         if (!ctx.qry.url && path) {
1083                 if (path[0] == '/')
1084                         path++;
1085                 ctx.qry.url = xstrdup(path);
1086                 if (ctx.qry.raw) {
1087                         char *newqry = fmtalloc("%s?%s", path, ctx.qry.raw);
1088                         free(ctx.qry.raw);
1089                         ctx.qry.raw = newqry;
1090                 } else
1091                         ctx.qry.raw = xstrdup(ctx.qry.url);
1092                 cgit_parse_url(ctx.qry.url);
1093         }
1094
1095         /* Before we go any further, we set ctx.env.authenticated by checking to see
1096          * if the supplied cookie is valid. All cookies are valid if there is no
1097          * auth_filter. If there is an auth_filter, the filter decides. */
1098         authenticate_cookie();
1099
1100         ttl = calc_ttl();
1101         if (ttl < 0)
1102                 ctx.page.expires += 10 * 365 * 24 * 60 * 60; /* 10 years */
1103         else
1104                 ctx.page.expires += ttl * 60;
1105         if (!ctx.env.authenticated || (ctx.env.request_method && !strcmp(ctx.env.request_method, "HEAD")))
1106                 ctx.cfg.cache_size = 0;
1107         err = cache_process(ctx.cfg.cache_size, ctx.cfg.cache_root,
1108                             ctx.qry.raw, ttl, process_request);
1109         cgit_cleanup_filters();
1110         if (err)
1111                 cgit_print_error("Error processing page: %s (%d)",
1112                                  strerror(err), err);
1113         return err;
1114 }