]> gitweb.ps.run Git - ps-cgit/blob - cgit.c
js: add dynamic age update
[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                 string_list_append(&ctx.cfg.css, xstrdup(value));
146         else if (!strcmp(name, "js"))
147                 string_list_append(&ctx.cfg.js, xstrdup(value));
148         else if (!strcmp(name, "favicon"))
149                 ctx.cfg.favicon = xstrdup(value);
150         else if (!strcmp(name, "footer"))
151                 ctx.cfg.footer = xstrdup(value);
152         else if (!strcmp(name, "head-include"))
153                 ctx.cfg.head_include = xstrdup(value);
154         else if (!strcmp(name, "header"))
155                 ctx.cfg.header = xstrdup(value);
156         else if (!strcmp(name, "logo"))
157                 ctx.cfg.logo = xstrdup(value);
158         else if (!strcmp(name, "logo-link"))
159                 ctx.cfg.logo_link = xstrdup(value);
160         else if (!strcmp(name, "module-link"))
161                 ctx.cfg.module_link = xstrdup(value);
162         else if (!strcmp(name, "strict-export"))
163                 ctx.cfg.strict_export = xstrdup(value);
164         else if (!strcmp(name, "virtual-root"))
165                 ctx.cfg.virtual_root = ensure_end(value, '/');
166         else if (!strcmp(name, "noplainemail"))
167                 ctx.cfg.noplainemail = atoi(value);
168         else if (!strcmp(name, "noheader"))
169                 ctx.cfg.noheader = atoi(value);
170         else if (!strcmp(name, "snapshots"))
171                 ctx.cfg.snapshots = cgit_parse_snapshots_mask(value);
172         else if (!strcmp(name, "enable-filter-overrides"))
173                 ctx.cfg.enable_filter_overrides = atoi(value);
174         else if (!strcmp(name, "enable-follow-links"))
175                 ctx.cfg.enable_follow_links = atoi(value);
176         else if (!strcmp(name, "enable-http-clone"))
177                 ctx.cfg.enable_http_clone = atoi(value);
178         else if (!strcmp(name, "enable-index-links"))
179                 ctx.cfg.enable_index_links = atoi(value);
180         else if (!strcmp(name, "enable-index-owner"))
181                 ctx.cfg.enable_index_owner = atoi(value);
182         else if (!strcmp(name, "enable-blame"))
183                 ctx.cfg.enable_blame = atoi(value);
184         else if (!strcmp(name, "enable-commit-graph"))
185                 ctx.cfg.enable_commit_graph = atoi(value);
186         else if (!strcmp(name, "enable-log-filecount"))
187                 ctx.cfg.enable_log_filecount = atoi(value);
188         else if (!strcmp(name, "enable-log-linecount"))
189                 ctx.cfg.enable_log_linecount = atoi(value);
190         else if (!strcmp(name, "enable-remote-branches"))
191                 ctx.cfg.enable_remote_branches = atoi(value);
192         else if (!strcmp(name, "enable-subject-links"))
193                 ctx.cfg.enable_subject_links = atoi(value);
194         else if (!strcmp(name, "enable-html-serving"))
195                 ctx.cfg.enable_html_serving = atoi(value);
196         else if (!strcmp(name, "enable-tree-linenumbers"))
197                 ctx.cfg.enable_tree_linenumbers = atoi(value);
198         else if (!strcmp(name, "enable-git-config"))
199                 ctx.cfg.enable_git_config = atoi(value);
200         else if (!strcmp(name, "max-stats"))
201                 ctx.cfg.max_stats = cgit_find_stats_period(value, NULL);
202         else if (!strcmp(name, "cache-size"))
203                 ctx.cfg.cache_size = atoi(value);
204         else if (!strcmp(name, "cache-root"))
205                 ctx.cfg.cache_root = xstrdup(expand_macros(value));
206         else if (!strcmp(name, "cache-root-ttl"))
207                 ctx.cfg.cache_root_ttl = atoi(value);
208         else if (!strcmp(name, "cache-repo-ttl"))
209                 ctx.cfg.cache_repo_ttl = atoi(value);
210         else if (!strcmp(name, "cache-scanrc-ttl"))
211                 ctx.cfg.cache_scanrc_ttl = atoi(value);
212         else if (!strcmp(name, "cache-static-ttl"))
213                 ctx.cfg.cache_static_ttl = atoi(value);
214         else if (!strcmp(name, "cache-dynamic-ttl"))
215                 ctx.cfg.cache_dynamic_ttl = atoi(value);
216         else if (!strcmp(name, "cache-about-ttl"))
217                 ctx.cfg.cache_about_ttl = atoi(value);
218         else if (!strcmp(name, "cache-snapshot-ttl"))
219                 ctx.cfg.cache_snapshot_ttl = atoi(value);
220         else if (!strcmp(name, "case-sensitive-sort"))
221                 ctx.cfg.case_sensitive_sort = atoi(value);
222         else if (!strcmp(name, "about-filter"))
223                 ctx.cfg.about_filter = cgit_new_filter(value, ABOUT);
224         else if (!strcmp(name, "commit-filter"))
225                 ctx.cfg.commit_filter = cgit_new_filter(value, COMMIT);
226         else if (!strcmp(name, "email-filter"))
227                 ctx.cfg.email_filter = cgit_new_filter(value, EMAIL);
228         else if (!strcmp(name, "owner-filter"))
229                 ctx.cfg.owner_filter = cgit_new_filter(value, OWNER);
230         else if (!strcmp(name, "auth-filter"))
231                 ctx.cfg.auth_filter = cgit_new_filter(value, AUTH);
232         else if (!strcmp(name, "embedded"))
233                 ctx.cfg.embedded = atoi(value);
234         else if (!strcmp(name, "max-atom-items"))
235                 ctx.cfg.max_atom_items = atoi(value);
236         else if (!strcmp(name, "max-message-length"))
237                 ctx.cfg.max_msg_len = atoi(value);
238         else if (!strcmp(name, "max-repodesc-length"))
239                 ctx.cfg.max_repodesc_len = atoi(value);
240         else if (!strcmp(name, "max-blob-size"))
241                 ctx.cfg.max_blob_size = atoi(value);
242         else if (!strcmp(name, "max-repo-count")) {
243                 ctx.cfg.max_repo_count = atoi(value);
244                 if (ctx.cfg.max_repo_count <= 0)
245                         ctx.cfg.max_repo_count = INT_MAX;
246         } else if (!strcmp(name, "max-commit-count"))
247                 ctx.cfg.max_commit_count = atoi(value);
248         else if (!strcmp(name, "project-list"))
249                 ctx.cfg.project_list = xstrdup(expand_macros(value));
250         else if (!strcmp(name, "scan-path"))
251                 if (ctx.cfg.cache_size)
252                         process_cached_repolist(expand_macros(value));
253                 else if (ctx.cfg.project_list)
254                         scan_projects(expand_macros(value),
255                                       ctx.cfg.project_list, repo_config);
256                 else
257                         scan_tree(expand_macros(value), repo_config);
258         else if (!strcmp(name, "scan-hidden-path"))
259                 ctx.cfg.scan_hidden_path = atoi(value);
260         else if (!strcmp(name, "section-from-path"))
261                 ctx.cfg.section_from_path = atoi(value);
262         else if (!strcmp(name, "repository-sort"))
263                 ctx.cfg.repository_sort = xstrdup(value);
264         else if (!strcmp(name, "section-sort"))
265                 ctx.cfg.section_sort = atoi(value);
266         else if (!strcmp(name, "source-filter"))
267                 ctx.cfg.source_filter = cgit_new_filter(value, SOURCE);
268         else if (!strcmp(name, "summary-log"))
269                 ctx.cfg.summary_log = atoi(value);
270         else if (!strcmp(name, "summary-branches"))
271                 ctx.cfg.summary_branches = atoi(value);
272         else if (!strcmp(name, "summary-tags"))
273                 ctx.cfg.summary_tags = atoi(value);
274         else if (!strcmp(name, "side-by-side-diffs"))
275                 ctx.cfg.difftype = atoi(value) ? DIFF_SSDIFF : DIFF_UNIFIED;
276         else if (!strcmp(name, "agefile"))
277                 ctx.cfg.agefile = xstrdup(value);
278         else if (!strcmp(name, "mimetype-file"))
279                 ctx.cfg.mimetype_file = xstrdup(value);
280         else if (!strcmp(name, "renamelimit"))
281                 ctx.cfg.renamelimit = atoi(value);
282         else if (!strcmp(name, "remove-suffix"))
283                 ctx.cfg.remove_suffix = atoi(value);
284         else if (!strcmp(name, "robots"))
285                 ctx.cfg.robots = xstrdup(value);
286         else if (!strcmp(name, "clone-prefix"))
287                 ctx.cfg.clone_prefix = xstrdup(value);
288         else if (!strcmp(name, "clone-url"))
289                 ctx.cfg.clone_url = xstrdup(value);
290         else if (!strcmp(name, "local-time"))
291                 ctx.cfg.local_time = atoi(value);
292         else if (!strcmp(name, "commit-sort")) {
293                 if (!strcmp(value, "date"))
294                         ctx.cfg.commit_sort = 1;
295                 if (!strcmp(value, "topo"))
296                         ctx.cfg.commit_sort = 2;
297         } else if (!strcmp(name, "branch-sort")) {
298                 if (!strcmp(value, "age"))
299                         ctx.cfg.branch_sort = 1;
300                 if (!strcmp(value, "name"))
301                         ctx.cfg.branch_sort = 0;
302         } else if (skip_prefix(name, "mimetype.", &arg))
303                 add_mimetype(arg, value);
304         else if (!strcmp(name, "include"))
305                 parse_configfile(expand_macros(value), config_cb);
306 }
307
308 static void querystring_cb(const char *name, const char *value)
309 {
310         if (!value)
311                 value = "";
312
313         if (!strcmp(name,"r")) {
314                 ctx.qry.repo = xstrdup(value);
315                 ctx.repo = cgit_get_repoinfo(value);
316         } else if (!strcmp(name, "p")) {
317                 ctx.qry.page = xstrdup(value);
318         } else if (!strcmp(name, "url")) {
319                 if (*value == '/')
320                         value++;
321                 ctx.qry.url = xstrdup(value);
322                 cgit_parse_url(value);
323         } else if (!strcmp(name, "qt")) {
324                 ctx.qry.grep = xstrdup(value);
325         } else if (!strcmp(name, "q")) {
326                 ctx.qry.search = xstrdup(value);
327         } else if (!strcmp(name, "h")) {
328                 ctx.qry.head = xstrdup(value);
329                 ctx.qry.has_symref = 1;
330         } else if (!strcmp(name, "id")) {
331                 ctx.qry.oid = xstrdup(value);
332                 ctx.qry.has_oid = 1;
333         } else if (!strcmp(name, "id2")) {
334                 ctx.qry.oid2 = xstrdup(value);
335                 ctx.qry.has_oid = 1;
336         } else if (!strcmp(name, "ofs")) {
337                 ctx.qry.ofs = atoi(value);
338         } else if (!strcmp(name, "path")) {
339                 ctx.qry.path = trim_end(value, '/');
340         } else if (!strcmp(name, "name")) {
341                 ctx.qry.name = xstrdup(value);
342         } else if (!strcmp(name, "s")) {
343                 ctx.qry.sort = xstrdup(value);
344         } else if (!strcmp(name, "showmsg")) {
345                 ctx.qry.showmsg = atoi(value);
346         } else if (!strcmp(name, "period")) {
347                 ctx.qry.period = xstrdup(value);
348         } else if (!strcmp(name, "dt")) {
349                 ctx.qry.difftype = atoi(value);
350                 ctx.qry.has_difftype = 1;
351         } else if (!strcmp(name, "ss")) {
352                 /* No longer generated, but there may be links out there. */
353                 ctx.qry.difftype = atoi(value) ? DIFF_SSDIFF : DIFF_UNIFIED;
354                 ctx.qry.has_difftype = 1;
355         } else if (!strcmp(name, "all")) {
356                 ctx.qry.show_all = atoi(value);
357         } else if (!strcmp(name, "context")) {
358                 ctx.qry.context = atoi(value);
359         } else if (!strcmp(name, "ignorews")) {
360                 ctx.qry.ignorews = atoi(value);
361         } else if (!strcmp(name, "follow")) {
362                 ctx.qry.follow = atoi(value);
363         }
364 }
365
366 static void prepare_context(void)
367 {
368         memset(&ctx, 0, sizeof(ctx));
369         ctx.cfg.agefile = "info/web/last-modified";
370         ctx.cfg.cache_size = 0;
371         ctx.cfg.cache_max_create_time = 5;
372         ctx.cfg.cache_root = CGIT_CACHE_ROOT;
373         ctx.cfg.cache_about_ttl = 15;
374         ctx.cfg.cache_snapshot_ttl = 5;
375         ctx.cfg.cache_repo_ttl = 5;
376         ctx.cfg.cache_root_ttl = 5;
377         ctx.cfg.cache_scanrc_ttl = 15;
378         ctx.cfg.cache_dynamic_ttl = 5;
379         ctx.cfg.cache_static_ttl = -1;
380         ctx.cfg.case_sensitive_sort = 1;
381         ctx.cfg.branch_sort = 0;
382         ctx.cfg.commit_sort = 0;
383         ctx.cfg.logo = "/cgit.png";
384         ctx.cfg.favicon = "/favicon.ico";
385         ctx.cfg.local_time = 0;
386         ctx.cfg.enable_http_clone = 1;
387         ctx.cfg.enable_index_owner = 1;
388         ctx.cfg.enable_tree_linenumbers = 1;
389         ctx.cfg.enable_git_config = 0;
390         ctx.cfg.max_repo_count = 50;
391         ctx.cfg.max_commit_count = 50;
392         ctx.cfg.max_lock_attempts = 5;
393         ctx.cfg.max_msg_len = 80;
394         ctx.cfg.max_repodesc_len = 80;
395         ctx.cfg.max_blob_size = 0;
396         ctx.cfg.max_stats = 0;
397         ctx.cfg.project_list = NULL;
398         ctx.cfg.renamelimit = -1;
399         ctx.cfg.remove_suffix = 0;
400         ctx.cfg.robots = "index, nofollow";
401         ctx.cfg.root_title = "Git repository browser";
402         ctx.cfg.root_desc = "a fast webinterface for the git dscm";
403         ctx.cfg.scan_hidden_path = 0;
404         ctx.cfg.script_name = CGIT_SCRIPT_NAME;
405         ctx.cfg.section = "";
406         ctx.cfg.repository_sort = "name";
407         ctx.cfg.section_sort = 1;
408         ctx.cfg.summary_branches = 10;
409         ctx.cfg.summary_log = 10;
410         ctx.cfg.summary_tags = 10;
411         ctx.cfg.max_atom_items = 10;
412         ctx.cfg.difftype = DIFF_UNIFIED;
413         ctx.env.cgit_config = getenv("CGIT_CONFIG");
414         ctx.env.http_host = getenv("HTTP_HOST");
415         ctx.env.https = getenv("HTTPS");
416         ctx.env.no_http = getenv("NO_HTTP");
417         ctx.env.path_info = getenv("PATH_INFO");
418         ctx.env.query_string = getenv("QUERY_STRING");
419         ctx.env.request_method = getenv("REQUEST_METHOD");
420         ctx.env.script_name = getenv("SCRIPT_NAME");
421         ctx.env.server_name = getenv("SERVER_NAME");
422         ctx.env.server_port = getenv("SERVER_PORT");
423         ctx.env.http_cookie = getenv("HTTP_COOKIE");
424         ctx.env.http_referer = getenv("HTTP_REFERER");
425         ctx.env.content_length = getenv("CONTENT_LENGTH") ? strtoul(getenv("CONTENT_LENGTH"), NULL, 10) : 0;
426         ctx.env.authenticated = 0;
427         ctx.page.mimetype = "text/html";
428         ctx.page.charset = PAGE_ENCODING;
429         ctx.page.filename = NULL;
430         ctx.page.size = 0;
431         ctx.page.modified = time(NULL);
432         ctx.page.expires = ctx.page.modified;
433         ctx.page.etag = NULL;
434         string_list_init_dup(&ctx.cfg.mimetypes);
435         if (ctx.env.script_name)
436                 ctx.cfg.script_name = xstrdup(ctx.env.script_name);
437         if (ctx.env.query_string)
438                 ctx.qry.raw = xstrdup(ctx.env.query_string);
439         if (!ctx.env.cgit_config)
440                 ctx.env.cgit_config = CGIT_CONFIG;
441 }
442
443 struct refmatch {
444         char *req_ref;
445         char *first_ref;
446         int match;
447 };
448
449 static int find_current_ref(const char *refname, const struct object_id *oid,
450                             int flags, void *cb_data)
451 {
452         struct refmatch *info;
453
454         info = (struct refmatch *)cb_data;
455         if (!strcmp(refname, info->req_ref))
456                 info->match = 1;
457         if (!info->first_ref)
458                 info->first_ref = xstrdup(refname);
459         return info->match;
460 }
461
462 static void free_refmatch_inner(struct refmatch *info)
463 {
464         if (info->first_ref)
465                 free(info->first_ref);
466 }
467
468 static char *find_default_branch(struct cgit_repo *repo)
469 {
470         struct refmatch info;
471         char *ref;
472
473         info.req_ref = repo->defbranch;
474         info.first_ref = NULL;
475         info.match = 0;
476         for_each_branch_ref(find_current_ref, &info);
477         if (info.match)
478                 ref = info.req_ref;
479         else
480                 ref = info.first_ref;
481         if (ref)
482                 ref = xstrdup(ref);
483         free_refmatch_inner(&info);
484
485         return ref;
486 }
487
488 static char *guess_defbranch(void)
489 {
490         const char *ref, *refname;
491         struct object_id oid;
492
493         ref = resolve_ref_unsafe("HEAD", 0, &oid, NULL);
494         if (!ref || !skip_prefix(ref, "refs/heads/", &refname))
495                 return "master";
496         return xstrdup(refname);
497 }
498
499 /* The caller must free filename and ref after calling this. */
500 static inline void parse_readme(const char *readme, char **filename, char **ref, struct cgit_repo *repo)
501 {
502         const char *colon;
503
504         *filename = NULL;
505         *ref = NULL;
506
507         if (!readme || !readme[0])
508                 return;
509
510         /* Check if the readme is tracked in the git repo. */
511         colon = strchr(readme, ':');
512         if (colon && strlen(colon) > 1) {
513                 /* If it starts with a colon, we want to use head given
514                  * from query or the default branch */
515                 if (colon == readme && ctx.qry.head)
516                         *ref = xstrdup(ctx.qry.head);
517                 else if (colon == readme && repo->defbranch)
518                         *ref = xstrdup(repo->defbranch);
519                 else
520                         *ref = xstrndup(readme, colon - readme);
521                 readme = colon + 1;
522         }
523
524         /* Prepend repo path to relative readme path unless tracked. */
525         if (!(*ref) && readme[0] != '/')
526                 *filename = fmtalloc("%s/%s", repo->path, readme);
527         else
528                 *filename = xstrdup(readme);
529 }
530 static void choose_readme(struct cgit_repo *repo)
531 {
532         int found;
533         char *filename, *ref;
534         struct string_list_item *entry;
535
536         if (!repo->readme.nr)
537                 return;
538
539         found = 0;
540         for_each_string_list_item(entry, &repo->readme) {
541                 parse_readme(entry->string, &filename, &ref, repo);
542                 if (!filename) {
543                         free(filename);
544                         free(ref);
545                         continue;
546                 }
547                 if (ref) {
548                         if (cgit_ref_path_exists(filename, ref, 1)) {
549                                 found = 1;
550                                 break;
551                         }
552                 }
553                 else if (!access(filename, R_OK)) {
554                         found = 1;
555                         break;
556                 }
557                 free(filename);
558                 free(ref);
559         }
560         repo->readme.strdup_strings = 1;
561         string_list_clear(&repo->readme, 0);
562         repo->readme.strdup_strings = 0;
563         if (found)
564                 string_list_append(&repo->readme, filename)->util = ref;
565 }
566
567 static void print_no_repo_clone_urls(const char *url)
568 {
569         html("<tr><td><a rel='vcs-git' href='");
570         html_url_path(url);
571         html("' title='");
572         html_attr(ctx.repo->name);
573         html(" Git repository'>");
574         html_txt(url);
575         html("</a></td></tr>\n");
576 }
577
578 static void prepare_repo_env(int *nongit)
579 {
580         /* The path to the git repository. */
581         setenv("GIT_DIR", ctx.repo->path, 1);
582
583         /* Setup the git directory and initialize the notes system. Both of these
584          * load local configuration from the git repository, so we do them both while
585          * the HOME variables are unset. */
586         setup_git_directory_gently(nongit);
587         load_display_notes(NULL);
588 }
589
590 static int prepare_repo_cmd(int nongit)
591 {
592         struct object_id oid;
593         int rc;
594
595         if (nongit) {
596                 const char *name = ctx.repo->name;
597                 rc = errno;
598                 ctx.page.title = fmtalloc("%s - %s", ctx.cfg.root_title,
599                                                 "config error");
600                 ctx.repo = NULL;
601                 cgit_print_http_headers();
602                 cgit_print_docstart();
603                 cgit_print_pageheader();
604                 cgit_print_error("Failed to open %s: %s", name,
605                                  rc ? strerror(rc) : "Not a valid git repository");
606                 cgit_print_docend();
607                 return 1;
608         }
609         ctx.page.title = fmtalloc("%s - %s", ctx.repo->name, ctx.repo->desc);
610
611         if (!ctx.repo->defbranch)
612                 ctx.repo->defbranch = guess_defbranch();
613
614         if (!ctx.qry.head) {
615                 ctx.qry.nohead = 1;
616                 ctx.qry.head = find_default_branch(ctx.repo);
617         }
618
619         if (!ctx.qry.head) {
620                 cgit_print_http_headers();
621                 cgit_print_docstart();
622                 cgit_print_pageheader();
623                 cgit_print_error("Repository seems to be empty");
624                 if (!strcmp(ctx.qry.page, "summary")) {
625                         html("<table class='list'><tr class='nohover'><td>&nbsp;</td></tr><tr class='nohover'><th class='left'>Clone</th></tr>\n");
626                         cgit_prepare_repo_env(ctx.repo);
627                         cgit_add_clone_urls(print_no_repo_clone_urls);
628                         html("</table>\n");
629                 }
630                 cgit_print_docend();
631                 return 1;
632         }
633
634         if (get_oid(ctx.qry.head, &oid)) {
635                 char *old_head = ctx.qry.head;
636                 ctx.qry.head = xstrdup(ctx.repo->defbranch);
637                 cgit_print_error_page(404, "Not found",
638                                 "Invalid branch: %s", old_head);
639                 free(old_head);
640                 return 1;
641         }
642         string_list_sort(&ctx.repo->submodules);
643         cgit_prepare_repo_env(ctx.repo);
644         choose_readme(ctx.repo);
645         return 0;
646 }
647
648 static inline void open_auth_filter(const char *function)
649 {
650         cgit_open_filter(ctx.cfg.auth_filter, function,
651                 ctx.env.http_cookie ? ctx.env.http_cookie : "",
652                 ctx.env.request_method ? ctx.env.request_method : "",
653                 ctx.env.query_string ? ctx.env.query_string : "",
654                 ctx.env.http_referer ? ctx.env.http_referer : "",
655                 ctx.env.path_info ? ctx.env.path_info : "",
656                 ctx.env.http_host ? ctx.env.http_host : "",
657                 ctx.env.https ? ctx.env.https : "",
658                 ctx.qry.repo ? ctx.qry.repo : "",
659                 ctx.qry.page ? ctx.qry.page : "",
660                 cgit_currentfullurl(),
661                 cgit_loginurl());
662 }
663
664 /* We intentionally keep this rather small, instead of looping and
665  * feeding it to the filter a couple bytes at a time. This way, the
666  * filter itself does not need to handle any denial of service or
667  * buffer bloat issues. If this winds up being too small, people
668  * will complain on the mailing list, and we'll increase it as needed. */
669 #define MAX_AUTHENTICATION_POST_BYTES 4096
670 /* The filter is expected to spit out "Status: " and all headers. */
671 static inline void authenticate_post(void)
672 {
673         char buffer[MAX_AUTHENTICATION_POST_BYTES];
674         ssize_t len;
675
676         open_auth_filter("authenticate-post");
677         len = ctx.env.content_length;
678         if (len > MAX_AUTHENTICATION_POST_BYTES)
679                 len = MAX_AUTHENTICATION_POST_BYTES;
680         if ((len = read(STDIN_FILENO, buffer, len)) < 0)
681                 die_errno("Could not read POST from stdin");
682         if (write(STDOUT_FILENO, buffer, len) < 0)
683                 die_errno("Could not write POST to stdout");
684         cgit_close_filter(ctx.cfg.auth_filter);
685         exit(0);
686 }
687
688 static inline void authenticate_cookie(void)
689 {
690         /* If we don't have an auth_filter, consider all cookies valid, and thus return early. */
691         if (!ctx.cfg.auth_filter) {
692                 ctx.env.authenticated = 1;
693                 return;
694         }
695
696         /* If we're having something POST'd to /login, we're authenticating POST,
697          * instead of the cookie, so call authenticate_post and bail out early.
698          * This pattern here should match /?p=login with POST. */
699         if (ctx.env.request_method && ctx.qry.page && !ctx.repo && \
700             !strcmp(ctx.env.request_method, "POST") && !strcmp(ctx.qry.page, "login")) {
701                 authenticate_post();
702                 return;
703         }
704
705         /* If we've made it this far, we're authenticating the cookie for real, so do that. */
706         open_auth_filter("authenticate-cookie");
707         ctx.env.authenticated = cgit_close_filter(ctx.cfg.auth_filter);
708 }
709
710 static void process_request(void)
711 {
712         struct cgit_cmd *cmd;
713         int nongit = 0;
714
715         /* If we're not yet authenticated, no matter what page we're on,
716          * display the authentication body from the auth_filter. This should
717          * never be cached. */
718         if (!ctx.env.authenticated) {
719                 ctx.page.title = "Authentication Required";
720                 cgit_print_http_headers();
721                 cgit_print_docstart();
722                 cgit_print_pageheader();
723                 open_auth_filter("body");
724                 cgit_close_filter(ctx.cfg.auth_filter);
725                 cgit_print_docend();
726                 return;
727         }
728
729         if (ctx.repo)
730                 prepare_repo_env(&nongit);
731
732         cmd = cgit_get_cmd();
733         if (!cmd) {
734                 ctx.page.title = "cgit error";
735                 cgit_print_error_page(404, "Not found", "Invalid request");
736                 return;
737         }
738
739         if (!ctx.cfg.enable_http_clone && cmd->is_clone) {
740                 ctx.page.title = "cgit error";
741                 cgit_print_error_page(404, "Not found", "Invalid request");
742                 return;
743         }
744
745         if (cmd->want_repo && !ctx.repo) {
746                 cgit_print_error_page(400, "Bad request",
747                                 "No repository selected");
748                 return;
749         }
750
751         /* If cmd->want_vpath is set, assume ctx.qry.path contains a "virtual"
752          * in-project path limit to be made available at ctx.qry.vpath.
753          * Otherwise, no path limit is in effect (ctx.qry.vpath = NULL).
754          */
755         ctx.qry.vpath = cmd->want_vpath ? ctx.qry.path : NULL;
756
757         if (ctx.repo && prepare_repo_cmd(nongit))
758                 return;
759
760         cmd->fn();
761 }
762
763 static int cmp_repos(const void *a, const void *b)
764 {
765         const struct cgit_repo *ra = a, *rb = b;
766         return strcmp(ra->url, rb->url);
767 }
768
769 static char *build_snapshot_setting(int bitmap)
770 {
771         const struct cgit_snapshot_format *f;
772         struct strbuf result = STRBUF_INIT;
773
774         for (f = cgit_snapshot_formats; f->suffix; f++) {
775                 if (cgit_snapshot_format_bit(f) & bitmap) {
776                         if (result.len)
777                                 strbuf_addch(&result, ' ');
778                         strbuf_addstr(&result, f->suffix);
779                 }
780         }
781         return strbuf_detach(&result, NULL);
782 }
783
784 static char *get_first_line(char *txt)
785 {
786         char *t = xstrdup(txt);
787         char *p = strchr(t, '\n');
788         if (p)
789                 *p = '\0';
790         return t;
791 }
792
793 static void print_repo(FILE *f, struct cgit_repo *repo)
794 {
795         struct string_list_item *item;
796         fprintf(f, "repo.url=%s\n", repo->url);
797         fprintf(f, "repo.name=%s\n", repo->name);
798         fprintf(f, "repo.path=%s\n", repo->path);
799         if (repo->owner)
800                 fprintf(f, "repo.owner=%s\n", repo->owner);
801         if (repo->desc) {
802                 char *tmp = get_first_line(repo->desc);
803                 fprintf(f, "repo.desc=%s\n", tmp);
804                 free(tmp);
805         }
806         for_each_string_list_item(item, &repo->readme) {
807                 if (item->util)
808                         fprintf(f, "repo.readme=%s:%s\n", (char *)item->util, item->string);
809                 else
810                         fprintf(f, "repo.readme=%s\n", item->string);
811         }
812         if (repo->defbranch)
813                 fprintf(f, "repo.defbranch=%s\n", repo->defbranch);
814         if (repo->extra_head_content)
815                 fprintf(f, "repo.extra-head-content=%s\n", repo->extra_head_content);
816         if (repo->module_link)
817                 fprintf(f, "repo.module-link=%s\n", repo->module_link);
818         if (repo->section)
819                 fprintf(f, "repo.section=%s\n", repo->section);
820         if (repo->homepage)
821                 fprintf(f, "repo.homepage=%s\n", repo->homepage);
822         if (repo->clone_url)
823                 fprintf(f, "repo.clone-url=%s\n", repo->clone_url);
824         fprintf(f, "repo.enable-blame=%d\n",
825                 repo->enable_blame);
826         fprintf(f, "repo.enable-commit-graph=%d\n",
827                 repo->enable_commit_graph);
828         fprintf(f, "repo.enable-log-filecount=%d\n",
829                 repo->enable_log_filecount);
830         fprintf(f, "repo.enable-log-linecount=%d\n",
831                 repo->enable_log_linecount);
832         if (repo->about_filter && repo->about_filter != ctx.cfg.about_filter)
833                 cgit_fprintf_filter(repo->about_filter, f, "repo.about-filter=");
834         if (repo->commit_filter && repo->commit_filter != ctx.cfg.commit_filter)
835                 cgit_fprintf_filter(repo->commit_filter, f, "repo.commit-filter=");
836         if (repo->source_filter && repo->source_filter != ctx.cfg.source_filter)
837                 cgit_fprintf_filter(repo->source_filter, f, "repo.source-filter=");
838         if (repo->email_filter && repo->email_filter != ctx.cfg.email_filter)
839                 cgit_fprintf_filter(repo->email_filter, f, "repo.email-filter=");
840         if (repo->owner_filter && repo->owner_filter != ctx.cfg.owner_filter)
841                 cgit_fprintf_filter(repo->owner_filter, f, "repo.owner-filter=");
842         if (repo->snapshots != ctx.cfg.snapshots) {
843                 char *tmp = build_snapshot_setting(repo->snapshots);
844                 fprintf(f, "repo.snapshots=%s\n", tmp ? tmp : "");
845                 free(tmp);
846         }
847         if (repo->snapshot_prefix)
848                 fprintf(f, "repo.snapshot-prefix=%s\n", repo->snapshot_prefix);
849         if (repo->max_stats != ctx.cfg.max_stats)
850                 fprintf(f, "repo.max-stats=%s\n",
851                         cgit_find_stats_periodname(repo->max_stats));
852         if (repo->logo)
853                 fprintf(f, "repo.logo=%s\n", repo->logo);
854         if (repo->logo_link)
855                 fprintf(f, "repo.logo-link=%s\n", repo->logo_link);
856         fprintf(f, "repo.enable-remote-branches=%d\n", repo->enable_remote_branches);
857         fprintf(f, "repo.enable-subject-links=%d\n", repo->enable_subject_links);
858         fprintf(f, "repo.enable-html-serving=%d\n", repo->enable_html_serving);
859         if (repo->branch_sort == 1)
860                 fprintf(f, "repo.branch-sort=age\n");
861         if (repo->commit_sort) {
862                 if (repo->commit_sort == 1)
863                         fprintf(f, "repo.commit-sort=date\n");
864                 else if (repo->commit_sort == 2)
865                         fprintf(f, "repo.commit-sort=topo\n");
866         }
867         fprintf(f, "repo.hide=%d\n", repo->hide);
868         fprintf(f, "repo.ignore=%d\n", repo->ignore);
869         fprintf(f, "\n");
870 }
871
872 static void print_repolist(FILE *f, struct cgit_repolist *list, int start)
873 {
874         int i;
875
876         for (i = start; i < list->count; i++)
877                 print_repo(f, &list->repos[i]);
878 }
879
880 /* Scan 'path' for git repositories, save the resulting repolist in 'cached_rc'
881  * and return 0 on success.
882  */
883 static int generate_cached_repolist(const char *path, const char *cached_rc)
884 {
885         struct strbuf locked_rc = STRBUF_INIT;
886         int result = 0;
887         int idx;
888         FILE *f;
889
890         strbuf_addf(&locked_rc, "%s.lock", cached_rc);
891         f = fopen(locked_rc.buf, "wx");
892         if (!f) {
893                 /* Inform about the error unless the lockfile already existed,
894                  * since that only means we've got concurrent requests.
895                  */
896                 result = errno;
897                 if (result != EEXIST)
898                         fprintf(stderr, "[cgit] Error opening %s: %s (%d)\n",
899                                 locked_rc.buf, strerror(result), result);
900                 goto out;
901         }
902         idx = cgit_repolist.count;
903         if (ctx.cfg.project_list)
904                 scan_projects(path, ctx.cfg.project_list, repo_config);
905         else
906                 scan_tree(path, repo_config);
907         print_repolist(f, &cgit_repolist, idx);
908         if (rename(locked_rc.buf, cached_rc))
909                 fprintf(stderr, "[cgit] Error renaming %s to %s: %s (%d)\n",
910                         locked_rc.buf, cached_rc, strerror(errno), errno);
911         fclose(f);
912 out:
913         strbuf_release(&locked_rc);
914         return result;
915 }
916
917 static void process_cached_repolist(const char *path)
918 {
919         struct stat st;
920         struct strbuf cached_rc = STRBUF_INIT;
921         time_t age;
922         unsigned long hash;
923
924         hash = hash_str(path);
925         if (ctx.cfg.project_list)
926                 hash += hash_str(ctx.cfg.project_list);
927         strbuf_addf(&cached_rc, "%s/rc-%8lx", ctx.cfg.cache_root, hash);
928
929         if (stat(cached_rc.buf, &st)) {
930                 /* Nothing is cached, we need to scan without forking. And
931                  * if we fail to generate a cached repolist, we need to
932                  * invoke scan_tree manually.
933                  */
934                 if (generate_cached_repolist(path, cached_rc.buf)) {
935                         if (ctx.cfg.project_list)
936                                 scan_projects(path, ctx.cfg.project_list,
937                                               repo_config);
938                         else
939                                 scan_tree(path, repo_config);
940                 }
941                 goto out;
942         }
943
944         parse_configfile(cached_rc.buf, config_cb);
945
946         /* If the cached configfile hasn't expired, lets exit now */
947         age = time(NULL) - st.st_mtime;
948         if (age <= (ctx.cfg.cache_scanrc_ttl * 60))
949                 goto out;
950
951         /* The cached repolist has been parsed, but it was old. So lets
952          * rescan the specified path and generate a new cached repolist
953          * in a child-process to avoid latency for the current request.
954          */
955         if (fork())
956                 goto out;
957
958         exit(generate_cached_repolist(path, cached_rc.buf));
959 out:
960         strbuf_release(&cached_rc);
961 }
962
963 static void cgit_parse_args(int argc, const char **argv)
964 {
965         int i;
966         const char *arg;
967         int scan = 0;
968
969         for (i = 1; i < argc; i++) {
970                 if (!strcmp(argv[i], "--version")) {
971                         printf("CGit %s | https://git.zx2c4.com/cgit/\n\nCompiled in features:\n", CGIT_VERSION);
972 #ifdef NO_LUA
973                         printf("[-] ");
974 #else
975                         printf("[+] ");
976 #endif
977                         printf("Lua scripting\n");
978 #ifndef HAVE_LINUX_SENDFILE
979                         printf("[-] ");
980 #else
981                         printf("[+] ");
982 #endif
983                         printf("Linux sendfile() usage\n");
984
985                         exit(0);
986                 }
987                 if (skip_prefix(argv[i], "--cache=", &arg)) {
988                         ctx.cfg.cache_root = xstrdup(arg);
989                 } else if (!strcmp(argv[i], "--nohttp")) {
990                         ctx.env.no_http = "1";
991                 } else if (skip_prefix(argv[i], "--query=", &arg)) {
992                         ctx.qry.raw = xstrdup(arg);
993                 } else if (skip_prefix(argv[i], "--repo=", &arg)) {
994                         ctx.qry.repo = xstrdup(arg);
995                 } else if (skip_prefix(argv[i], "--page=", &arg)) {
996                         ctx.qry.page = xstrdup(arg);
997                 } else if (skip_prefix(argv[i], "--head=", &arg)) {
998                         ctx.qry.head = xstrdup(arg);
999                         ctx.qry.has_symref = 1;
1000                 } else if (skip_prefix(argv[i], "--oid=", &arg)) {
1001                         ctx.qry.oid = xstrdup(arg);
1002                         ctx.qry.has_oid = 1;
1003                 } else if (skip_prefix(argv[i], "--ofs=", &arg)) {
1004                         ctx.qry.ofs = atoi(arg);
1005                 } else if (skip_prefix(argv[i], "--scan-tree=", &arg) ||
1006                            skip_prefix(argv[i], "--scan-path=", &arg)) {
1007                         /*
1008                          * HACK: The global snapshot bit mask defines the set
1009                          * of allowed snapshot formats, but the config file
1010                          * hasn't been parsed yet so the mask is currently 0.
1011                          * By setting all bits high before scanning we make
1012                          * sure that any in-repo cgitrc snapshot setting is
1013                          * respected by scan_tree().
1014                          *
1015                          * NOTE: We assume that there aren't more than 8
1016                          * different snapshot formats supported by cgit...
1017                          */
1018                         ctx.cfg.snapshots = 0xFF;
1019                         scan++;
1020                         scan_tree(arg, repo_config);
1021                 }
1022         }
1023         if (scan) {
1024                 qsort(cgit_repolist.repos, cgit_repolist.count,
1025                         sizeof(struct cgit_repo), cmp_repos);
1026                 print_repolist(stdout, &cgit_repolist, 0);
1027                 exit(0);
1028         }
1029 }
1030
1031 static int calc_ttl(void)
1032 {
1033         if (!ctx.repo)
1034                 return ctx.cfg.cache_root_ttl;
1035
1036         if (!ctx.qry.page)
1037                 return ctx.cfg.cache_repo_ttl;
1038
1039         if (!strcmp(ctx.qry.page, "about"))
1040                 return ctx.cfg.cache_about_ttl;
1041
1042         if (!strcmp(ctx.qry.page, "snapshot"))
1043                 return ctx.cfg.cache_snapshot_ttl;
1044
1045         if (ctx.qry.has_oid)
1046                 return ctx.cfg.cache_static_ttl;
1047
1048         if (ctx.qry.has_symref)
1049                 return ctx.cfg.cache_dynamic_ttl;
1050
1051         return ctx.cfg.cache_repo_ttl;
1052 }
1053
1054 int cmd_main(int argc, const char **argv)
1055 {
1056         const char *path;
1057         int err, ttl;
1058
1059         cgit_init_filters();
1060         atexit(cgit_cleanup_filters);
1061
1062         prepare_context();
1063         cgit_repolist.length = 0;
1064         cgit_repolist.count = 0;
1065         cgit_repolist.repos = NULL;
1066
1067         cgit_parse_args(argc, argv);
1068         parse_configfile(expand_macros(ctx.env.cgit_config), config_cb);
1069         ctx.repo = NULL;
1070         http_parse_querystring(ctx.qry.raw, querystring_cb);
1071
1072         /* If virtual-root isn't specified in cgitrc, lets pretend
1073          * that virtual-root equals SCRIPT_NAME, minus any possibly
1074          * trailing slashes.
1075          */
1076         if (!ctx.cfg.virtual_root && ctx.cfg.script_name)
1077                 ctx.cfg.virtual_root = ensure_end(ctx.cfg.script_name, '/');
1078
1079         /* If no url parameter is specified on the querystring, lets
1080          * use PATH_INFO as url. This allows cgit to work with virtual
1081          * urls without the need for rewriterules in the webserver (as
1082          * long as PATH_INFO is included in the cache lookup key).
1083          */
1084         path = ctx.env.path_info;
1085         if (!ctx.qry.url && path) {
1086                 if (path[0] == '/')
1087                         path++;
1088                 ctx.qry.url = xstrdup(path);
1089                 if (ctx.qry.raw) {
1090                         char *newqry = fmtalloc("%s?%s", path, ctx.qry.raw);
1091                         free(ctx.qry.raw);
1092                         ctx.qry.raw = newqry;
1093                 } else
1094                         ctx.qry.raw = xstrdup(ctx.qry.url);
1095                 cgit_parse_url(ctx.qry.url);
1096         }
1097
1098         /* Before we go any further, we set ctx.env.authenticated by checking to see
1099          * if the supplied cookie is valid. All cookies are valid if there is no
1100          * auth_filter. If there is an auth_filter, the filter decides. */
1101         authenticate_cookie();
1102
1103         ttl = calc_ttl();
1104         if (ttl < 0)
1105                 ctx.page.expires += 10 * 365 * 24 * 60 * 60; /* 10 years */
1106         else
1107                 ctx.page.expires += ttl * 60;
1108         if (!ctx.env.authenticated || (ctx.env.request_method && !strcmp(ctx.env.request_method, "HEAD")))
1109                 ctx.cfg.cache_size = 0;
1110         err = cache_process(ctx.cfg.cache_size, ctx.cfg.cache_root,
1111                             ctx.qry.raw, ttl, process_request);
1112         cgit_cleanup_filters();
1113         if (err)
1114                 cgit_print_error("Error processing page: %s (%d)",
1115                                  strerror(err), err);
1116         return err;
1117 }