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[ps-cgit] / shared.c
1 /* shared.c: global vars + some callback functions
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
11 struct cgit_repolist cgit_repolist;
12 struct cgit_context ctx;
13
14 int chk_zero(int result, char *msg)
15 {
16         if (result != 0)
17                 die_errno("%s", msg);
18         return result;
19 }
20
21 int chk_positive(int result, char *msg)
22 {
23         if (result <= 0)
24                 die_errno("%s", msg);
25         return result;
26 }
27
28 int chk_non_negative(int result, char *msg)
29 {
30         if (result < 0)
31                 die_errno("%s", msg);
32         return result;
33 }
34
35 char *cgit_default_repo_desc = "[no description]";
36 struct cgit_repo *cgit_add_repo(const char *url)
37 {
38         struct cgit_repo *ret;
39
40         if (++cgit_repolist.count > cgit_repolist.length) {
41                 if (cgit_repolist.length == 0)
42                         cgit_repolist.length = 8;
43                 else
44                         cgit_repolist.length *= 2;
45                 cgit_repolist.repos = xrealloc(cgit_repolist.repos,
46                                                cgit_repolist.length *
47                                                sizeof(struct cgit_repo));
48         }
49
50         ret = &cgit_repolist.repos[cgit_repolist.count-1];
51         memset(ret, 0, sizeof(struct cgit_repo));
52         ret->url = trim_end(url, '/');
53         ret->name = ret->url;
54         ret->path = NULL;
55         ret->desc = cgit_default_repo_desc;
56         ret->extra_head_content = NULL;
57         ret->owner = NULL;
58         ret->homepage = NULL;
59         ret->section = ctx.cfg.section;
60         ret->snapshots = ctx.cfg.snapshots;
61         ret->enable_blame = ctx.cfg.enable_blame;
62         ret->enable_commit_graph = ctx.cfg.enable_commit_graph;
63         ret->enable_log_filecount = ctx.cfg.enable_log_filecount;
64         ret->enable_log_linecount = ctx.cfg.enable_log_linecount;
65         ret->enable_remote_branches = ctx.cfg.enable_remote_branches;
66         ret->enable_subject_links = ctx.cfg.enable_subject_links;
67         ret->enable_html_serving = ctx.cfg.enable_html_serving;
68         ret->max_stats = ctx.cfg.max_stats;
69         ret->branch_sort = ctx.cfg.branch_sort;
70         ret->commit_sort = ctx.cfg.commit_sort;
71         ret->module_link = ctx.cfg.module_link;
72         ret->readme = ctx.cfg.readme;
73         ret->mtime = -1;
74         ret->about_filter = ctx.cfg.about_filter;
75         ret->commit_filter = ctx.cfg.commit_filter;
76         ret->source_filter = ctx.cfg.source_filter;
77         ret->email_filter = ctx.cfg.email_filter;
78         ret->owner_filter = ctx.cfg.owner_filter;
79         ret->clone_url = ctx.cfg.clone_url;
80         ret->submodules.strdup_strings = 1;
81         ret->hide = ret->ignore = 0;
82         return ret;
83 }
84
85 struct cgit_repo *cgit_get_repoinfo(const char *url)
86 {
87         int i;
88         struct cgit_repo *repo;
89
90         for (i = 0; i < cgit_repolist.count; i++) {
91                 repo = &cgit_repolist.repos[i];
92                 if (repo->ignore)
93                         continue;
94                 if (!strcmp(repo->url, url))
95                         return repo;
96         }
97         return NULL;
98 }
99
100 void cgit_free_commitinfo(struct commitinfo *info)
101 {
102         free(info->author);
103         free(info->author_email);
104         free(info->committer);
105         free(info->committer_email);
106         free(info->subject);
107         free(info->msg);
108         free(info->msg_encoding);
109         free(info);
110 }
111
112 char *trim_end(const char *str, char c)
113 {
114         int len;
115
116         if (str == NULL)
117                 return NULL;
118         len = strlen(str);
119         while (len > 0 && str[len - 1] == c)
120                 len--;
121         if (len == 0)
122                 return NULL;
123         return xstrndup(str, len);
124 }
125
126 char *ensure_end(const char *str, char c)
127 {
128         size_t len = strlen(str);
129         char *result;
130
131         if (len && str[len - 1] == c)
132                 return xstrndup(str, len);
133
134         result = xmalloc(len + 2);
135         memcpy(result, str, len);
136         result[len] = '/';
137         result[len + 1] = '\0';
138         return result;
139 }
140
141 void strbuf_ensure_end(struct strbuf *sb, char c)
142 {
143         if (!sb->len || sb->buf[sb->len - 1] != c)
144                 strbuf_addch(sb, c);
145 }
146
147 void cgit_add_ref(struct reflist *list, struct refinfo *ref)
148 {
149         size_t size;
150
151         if (list->count >= list->alloc) {
152                 list->alloc += (list->alloc ? list->alloc : 4);
153                 size = list->alloc * sizeof(struct refinfo *);
154                 list->refs = xrealloc(list->refs, size);
155         }
156         list->refs[list->count++] = ref;
157 }
158
159 static struct refinfo *cgit_mk_refinfo(const char *refname, const struct object_id *oid)
160 {
161         struct refinfo *ref;
162
163         ref = xmalloc(sizeof (struct refinfo));
164         ref->refname = xstrdup(refname);
165         ref->object = parse_object(the_repository, oid);
166         switch (ref->object->type) {
167         case OBJ_TAG:
168                 ref->tag = cgit_parse_tag((struct tag *)ref->object);
169                 break;
170         case OBJ_COMMIT:
171                 ref->commit = cgit_parse_commit((struct commit *)ref->object);
172                 break;
173         }
174         return ref;
175 }
176
177 void cgit_free_taginfo(struct taginfo *tag)
178 {
179         if (tag->tagger)
180                 free(tag->tagger);
181         if (tag->tagger_email)
182                 free(tag->tagger_email);
183         if (tag->msg)
184                 free(tag->msg);
185         free(tag);
186 }
187
188 static void cgit_free_refinfo(struct refinfo *ref)
189 {
190         if (ref->refname)
191                 free((char *)ref->refname);
192         switch (ref->object->type) {
193         case OBJ_TAG:
194                 cgit_free_taginfo(ref->tag);
195                 break;
196         case OBJ_COMMIT:
197                 cgit_free_commitinfo(ref->commit);
198                 break;
199         }
200         free(ref);
201 }
202
203 void cgit_free_reflist_inner(struct reflist *list)
204 {
205         int i;
206
207         for (i = 0; i < list->count; i++) {
208                 cgit_free_refinfo(list->refs[i]);
209         }
210         free(list->refs);
211 }
212
213 int cgit_refs_cb(const char *refname, const struct object_id *oid, int flags,
214                   void *cb_data)
215 {
216         struct reflist *list = (struct reflist *)cb_data;
217         struct refinfo *info = cgit_mk_refinfo(refname, oid);
218
219         if (info)
220                 cgit_add_ref(list, info);
221         return 0;
222 }
223
224 void cgit_diff_tree_cb(struct diff_queue_struct *q,
225                        struct diff_options *options, void *data)
226 {
227         int i;
228
229         for (i = 0; i < q->nr; i++) {
230                 if (q->queue[i]->status == 'U')
231                         continue;
232                 ((filepair_fn)data)(q->queue[i]);
233         }
234 }
235
236 static int load_mmfile(mmfile_t *file, const struct object_id *oid)
237 {
238         enum object_type type;
239
240         if (is_null_oid(oid)) {
241                 file->ptr = (char *)"";
242                 file->size = 0;
243         } else {
244                 file->ptr = read_object_file(oid, &type,
245                                            (unsigned long *)&file->size);
246         }
247         return 1;
248 }
249
250 /*
251  * Receive diff-buffers from xdiff and concatenate them as
252  * needed across multiple callbacks.
253  *
254  * This is basically a copy of xdiff-interface.c/xdiff_outf(),
255  * ripped from git and modified to use globals instead of
256  * a special callback-struct.
257  */
258 static char *diffbuf = NULL;
259 static int buflen = 0;
260
261 static int filediff_cb(void *priv, mmbuffer_t *mb, int nbuf)
262 {
263         int i;
264
265         for (i = 0; i < nbuf; i++) {
266                 if (mb[i].ptr[mb[i].size-1] != '\n') {
267                         /* Incomplete line */
268                         diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
269                         memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
270                         buflen += mb[i].size;
271                         continue;
272                 }
273
274                 /* we have a complete line */
275                 if (!diffbuf) {
276                         ((linediff_fn)priv)(mb[i].ptr, mb[i].size);
277                         continue;
278                 }
279                 diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
280                 memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
281                 ((linediff_fn)priv)(diffbuf, buflen + mb[i].size);
282                 free(diffbuf);
283                 diffbuf = NULL;
284                 buflen = 0;
285         }
286         if (diffbuf) {
287                 ((linediff_fn)priv)(diffbuf, buflen);
288                 free(diffbuf);
289                 diffbuf = NULL;
290                 buflen = 0;
291         }
292         return 0;
293 }
294
295 int cgit_diff_files(const struct object_id *old_oid,
296                     const struct object_id *new_oid, unsigned long *old_size,
297                     unsigned long *new_size, int *binary, int context,
298                     int ignorews, linediff_fn fn)
299 {
300         mmfile_t file1, file2;
301         xpparam_t diff_params;
302         xdemitconf_t emit_params;
303         xdemitcb_t emit_cb;
304
305         if (!load_mmfile(&file1, old_oid) || !load_mmfile(&file2, new_oid))
306                 return 1;
307
308         *old_size = file1.size;
309         *new_size = file2.size;
310
311         if ((file1.ptr && buffer_is_binary(file1.ptr, file1.size)) ||
312             (file2.ptr && buffer_is_binary(file2.ptr, file2.size))) {
313                 *binary = 1;
314                 if (file1.size)
315                         free(file1.ptr);
316                 if (file2.size)
317                         free(file2.ptr);
318                 return 0;
319         }
320
321         memset(&diff_params, 0, sizeof(diff_params));
322         memset(&emit_params, 0, sizeof(emit_params));
323         memset(&emit_cb, 0, sizeof(emit_cb));
324         diff_params.flags = XDF_NEED_MINIMAL;
325         if (ignorews)
326                 diff_params.flags |= XDF_IGNORE_WHITESPACE;
327         emit_params.ctxlen = context > 0 ? context : 3;
328         emit_params.flags = XDL_EMIT_FUNCNAMES;
329         emit_cb.out_line = filediff_cb;
330         emit_cb.priv = fn;
331         xdl_diff(&file1, &file2, &diff_params, &emit_params, &emit_cb);
332         if (file1.size)
333                 free(file1.ptr);
334         if (file2.size)
335                 free(file2.ptr);
336         return 0;
337 }
338
339 void cgit_diff_tree(const struct object_id *old_oid,
340                     const struct object_id *new_oid,
341                     filepair_fn fn, const char *prefix, int ignorews)
342 {
343         struct diff_options opt;
344         struct pathspec_item *item;
345
346         diff_setup(&opt);
347         opt.output_format = DIFF_FORMAT_CALLBACK;
348         opt.detect_rename = 1;
349         opt.rename_limit = ctx.cfg.renamelimit;
350         opt.flags.recursive = 1;
351         if (ignorews)
352                 DIFF_XDL_SET(&opt, IGNORE_WHITESPACE);
353         opt.format_callback = cgit_diff_tree_cb;
354         opt.format_callback_data = fn;
355         if (prefix) {
356                 item = xcalloc(1, sizeof(*item));
357                 item->match = xstrdup(prefix);
358                 item->len = strlen(prefix);
359                 opt.pathspec.nr = 1;
360                 opt.pathspec.items = item;
361         }
362         diff_setup_done(&opt);
363
364         if (old_oid && !is_null_oid(old_oid))
365                 diff_tree_oid(old_oid, new_oid, "", &opt);
366         else
367                 diff_root_tree_oid(new_oid, "", &opt);
368         diffcore_std(&opt);
369         diff_flush(&opt);
370 }
371
372 void cgit_diff_commit(struct commit *commit, filepair_fn fn, const char *prefix)
373 {
374         const struct object_id *old_oid = NULL;
375
376         if (commit->parents)
377                 old_oid = &commit->parents->item->object.oid;
378         cgit_diff_tree(old_oid, &commit->object.oid, fn, prefix,
379                        ctx.qry.ignorews);
380 }
381
382 int cgit_parse_snapshots_mask(const char *str)
383 {
384         struct string_list tokens = STRING_LIST_INIT_DUP;
385         struct string_list_item *item;
386         const struct cgit_snapshot_format *f;
387         int rv = 0;
388
389         /* favor legacy setting */
390         if (atoi(str))
391                 return 1;
392
393         if (strcmp(str, "all") == 0)
394                 return INT_MAX;
395
396         string_list_split(&tokens, str, ' ', -1);
397         string_list_remove_empty_items(&tokens, 0);
398
399         for_each_string_list_item(item, &tokens) {
400                 for (f = cgit_snapshot_formats; f->suffix; f++) {
401                         if (!strcmp(item->string, f->suffix) ||
402                             !strcmp(item->string, f->suffix + 1)) {
403                                 rv |= cgit_snapshot_format_bit(f);
404                                 break;
405                         }
406                 }
407         }
408
409         string_list_clear(&tokens, 0);
410         return rv;
411 }
412
413 typedef struct {
414         char * name;
415         char * value;
416 } cgit_env_var;
417
418 void cgit_prepare_repo_env(struct cgit_repo * repo)
419 {
420         cgit_env_var env_vars[] = {
421                 { .name = "CGIT_REPO_URL", .value = repo->url },
422                 { .name = "CGIT_REPO_NAME", .value = repo->name },
423                 { .name = "CGIT_REPO_PATH", .value = repo->path },
424                 { .name = "CGIT_REPO_OWNER", .value = repo->owner },
425                 { .name = "CGIT_REPO_DEFBRANCH", .value = repo->defbranch },
426                 { .name = "CGIT_REPO_SECTION", .value = repo->section },
427                 { .name = "CGIT_REPO_CLONE_URL", .value = repo->clone_url }
428         };
429         int env_var_count = ARRAY_SIZE(env_vars);
430         cgit_env_var *p, *q;
431         static char *warn = "cgit warning: failed to set env: %s=%s\n";
432
433         p = env_vars;
434         q = p + env_var_count;
435         for (; p < q; p++)
436                 if (p->value && setenv(p->name, p->value, 1))
437                         fprintf(stderr, warn, p->name, p->value);
438 }
439
440 /* Read the content of the specified file into a newly allocated buffer,
441  * zeroterminate the buffer and return 0 on success, errno otherwise.
442  */
443 int readfile(const char *path, char **buf, size_t *size)
444 {
445         int fd, e;
446         struct stat st;
447
448         fd = open(path, O_RDONLY);
449         if (fd == -1)
450                 return errno;
451         if (fstat(fd, &st)) {
452                 e = errno;
453                 close(fd);
454                 return e;
455         }
456         if (!S_ISREG(st.st_mode)) {
457                 close(fd);
458                 return EISDIR;
459         }
460         *buf = xmalloc(st.st_size + 1);
461         *size = read_in_full(fd, *buf, st.st_size);
462         e = errno;
463         (*buf)[*size] = '\0';
464         close(fd);
465         return (*size == st.st_size ? 0 : e);
466 }
467
468 static int is_token_char(char c)
469 {
470         return isalnum(c) || c == '_';
471 }
472
473 /* Replace name with getenv(name), return pointer to zero-terminating char
474  */
475 static char *expand_macro(char *name, int maxlength)
476 {
477         char *value;
478         size_t len;
479
480         len = 0;
481         value = getenv(name);
482         if (value) {
483                 len = strlen(value) + 1;
484                 if (len > maxlength)
485                         len = maxlength;
486                 strlcpy(name, value, len);
487                 --len;
488         }
489         return name + len;
490 }
491
492 #define EXPBUFSIZE (1024 * 8)
493
494 /* Replace all tokens prefixed by '$' in the specified text with the
495  * value of the named environment variable.
496  * NB: the return value is a static buffer, i.e. it must be strdup'd
497  * by the caller.
498  */
499 char *expand_macros(const char *txt)
500 {
501         static char result[EXPBUFSIZE];
502         char *p, *start;
503         int len;
504
505         p = result;
506         start = NULL;
507         while (p < result + EXPBUFSIZE - 1 && txt && *txt) {
508                 *p = *txt;
509                 if (start) {
510                         if (!is_token_char(*txt)) {
511                                 if (p - start > 0) {
512                                         *p = '\0';
513                                         len = result + EXPBUFSIZE - start - 1;
514                                         p = expand_macro(start, len) - 1;
515                                 }
516                                 start = NULL;
517                                 txt--;
518                         }
519                         p++;
520                         txt++;
521                         continue;
522                 }
523                 if (*txt == '$') {
524                         start = p;
525                         txt++;
526                         continue;
527                 }
528                 p++;
529                 txt++;
530         }
531         *p = '\0';
532         if (start && p - start > 0) {
533                 len = result + EXPBUFSIZE - start - 1;
534                 p = expand_macro(start, len);
535                 *p = '\0';
536         }
537         return result;
538 }
539
540 char *get_mimetype_for_filename(const char *filename)
541 {
542         char *ext, *mimetype, *token, line[1024], *saveptr;
543         FILE *file;
544         struct string_list_item *mime;
545
546         if (!filename)
547                 return NULL;
548
549         ext = strrchr(filename, '.');
550         if (!ext)
551                 return NULL;
552         ++ext;
553         if (!ext[0])
554                 return NULL;
555         mime = string_list_lookup(&ctx.cfg.mimetypes, ext);
556         if (mime)
557                 return xstrdup(mime->util);
558
559         if (!ctx.cfg.mimetype_file)
560                 return NULL;
561         file = fopen(ctx.cfg.mimetype_file, "r");
562         if (!file)
563                 return NULL;
564         while (fgets(line, sizeof(line), file)) {
565                 if (!line[0] || line[0] == '#')
566                         continue;
567                 mimetype = strtok_r(line, " \t\r\n", &saveptr);
568                 while ((token = strtok_r(NULL, " \t\r\n", &saveptr))) {
569                         if (!strcasecmp(ext, token)) {
570                                 fclose(file);
571                                 return xstrdup(mimetype);
572                         }
573                 }
574         }
575         fclose(file);
576         return NULL;
577 }