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1 /* shared.c: global vars + some callback functions
2  *
3  * Copyright (C) 2006 Lars Hjemli
4  *
5  * Licensed under GNU General Public License v2
6  *   (see COPYING for full license text)
7  */
8
9 #include "cgit.h"
10
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("%s: %s", msg, strerror(errno));
18         return result;
19 }
20
21 int chk_positive(int result, char *msg)
22 {
23         if (result <= 0)
24                 die("%s: %s", msg, strerror(errno));
25         return result;
26 }
27
28 int chk_non_negative(int result, char *msg)
29 {
30         if (result < 0)
31                 die("%s: %s",msg, strerror(errno));
32         return result;
33 }
34
35 struct cgit_repo *cgit_add_repo(const char *url)
36 {
37         struct cgit_repo *ret;
38
39         if (++cgit_repolist.count > cgit_repolist.length) {
40                 if (cgit_repolist.length == 0)
41                         cgit_repolist.length = 8;
42                 else
43                         cgit_repolist.length *= 2;
44                 cgit_repolist.repos = xrealloc(cgit_repolist.repos,
45                                                cgit_repolist.length *
46                                                sizeof(struct cgit_repo));
47         }
48
49         ret = &cgit_repolist.repos[cgit_repolist.count-1];
50         memset(ret, 0, sizeof(struct cgit_repo));
51         ret->url = trim_end(url, '/');
52         ret->name = ret->url;
53         ret->path = NULL;
54         ret->desc = "[no description]";
55         ret->owner = NULL;
56         ret->section = ctx.cfg.section;
57         ret->defbranch = "master";
58         ret->snapshots = ctx.cfg.snapshots;
59         ret->enable_log_filecount = ctx.cfg.enable_log_filecount;
60         ret->enable_log_linecount = ctx.cfg.enable_log_linecount;
61         ret->enable_remote_branches = ctx.cfg.enable_remote_branches;
62         ret->enable_subject_links = ctx.cfg.enable_subject_links;
63         ret->max_stats = ctx.cfg.max_stats;
64         ret->module_link = ctx.cfg.module_link;
65         ret->readme = ctx.cfg.readme;
66         ret->mtime = -1;
67         ret->about_filter = ctx.cfg.about_filter;
68         ret->commit_filter = ctx.cfg.commit_filter;
69         ret->source_filter = ctx.cfg.source_filter;
70         return ret;
71 }
72
73 struct cgit_repo *cgit_get_repoinfo(const char *url)
74 {
75         int i;
76         struct cgit_repo *repo;
77
78         for (i=0; i<cgit_repolist.count; i++) {
79                 repo = &cgit_repolist.repos[i];
80                 if (!strcmp(repo->url, url))
81                         return repo;
82         }
83         return NULL;
84 }
85
86 void *cgit_free_commitinfo(struct commitinfo *info)
87 {
88         free(info->author);
89         free(info->author_email);
90         free(info->committer);
91         free(info->committer_email);
92         free(info->subject);
93         free(info->msg);
94         free(info->msg_encoding);
95         free(info);
96         return NULL;
97 }
98
99 char *trim_end(const char *str, char c)
100 {
101         int len;
102         char *s, *t;
103
104         if (str == NULL)
105                 return NULL;
106         t = (char *)str;
107         len = strlen(t);
108         while(len > 0 && t[len - 1] == c)
109                 len--;
110
111         if (len == 0)
112                 return NULL;
113
114         c = t[len];
115         t[len] = '\0';
116         s = xstrdup(t);
117         t[len] = c;
118         return s;
119 }
120
121 char *strlpart(char *txt, int maxlen)
122 {
123         char *result;
124
125         if (!txt)
126                 return txt;
127
128         if (strlen(txt) <= maxlen)
129                 return txt;
130         result = xmalloc(maxlen + 1);
131         memcpy(result, txt, maxlen - 3);
132         result[maxlen-1] = result[maxlen-2] = result[maxlen-3] = '.';
133         result[maxlen] = '\0';
134         return result;
135 }
136
137 char *strrpart(char *txt, int maxlen)
138 {
139         char *result;
140
141         if (!txt)
142                 return txt;
143
144         if (strlen(txt) <= maxlen)
145                 return txt;
146         result = xmalloc(maxlen + 1);
147         memcpy(result + 3, txt + strlen(txt) - maxlen + 4, maxlen - 3);
148         result[0] = result[1] = result[2] = '.';
149         return result;
150 }
151
152 void cgit_add_ref(struct reflist *list, struct refinfo *ref)
153 {
154         size_t size;
155
156         if (list->count >= list->alloc) {
157                 list->alloc += (list->alloc ? list->alloc : 4);
158                 size = list->alloc * sizeof(struct refinfo *);
159                 list->refs = xrealloc(list->refs, size);
160         }
161         list->refs[list->count++] = ref;
162 }
163
164 struct refinfo *cgit_mk_refinfo(const char *refname, const unsigned char *sha1)
165 {
166         struct refinfo *ref;
167
168         ref = xmalloc(sizeof (struct refinfo));
169         ref->refname = xstrdup(refname);
170         ref->object = parse_object(sha1);
171         switch (ref->object->type) {
172         case OBJ_TAG:
173                 ref->tag = cgit_parse_tag((struct tag *)ref->object);
174                 break;
175         case OBJ_COMMIT:
176                 ref->commit = cgit_parse_commit((struct commit *)ref->object);
177                 break;
178         }
179         return ref;
180 }
181
182 int cgit_refs_cb(const char *refname, const unsigned char *sha1, int flags,
183                   void *cb_data)
184 {
185         struct reflist *list = (struct reflist *)cb_data;
186         struct refinfo *info = cgit_mk_refinfo(refname, sha1);
187
188         if (info)
189                 cgit_add_ref(list, info);
190         return 0;
191 }
192
193 void cgit_diff_tree_cb(struct diff_queue_struct *q,
194                        struct diff_options *options, void *data)
195 {
196         int i;
197
198         for (i = 0; i < q->nr; i++) {
199                 if (q->queue[i]->status == 'U')
200                         continue;
201                 ((filepair_fn)data)(q->queue[i]);
202         }
203 }
204
205 static int load_mmfile(mmfile_t *file, const unsigned char *sha1)
206 {
207         enum object_type type;
208
209         if (is_null_sha1(sha1)) {
210                 file->ptr = (char *)"";
211                 file->size = 0;
212         } else {
213                 file->ptr = read_sha1_file(sha1, &type, 
214                                            (unsigned long *)&file->size);
215         }
216         return 1;
217 }
218
219 /*
220  * Receive diff-buffers from xdiff and concatenate them as
221  * needed across multiple callbacks.
222  *
223  * This is basically a copy of xdiff-interface.c/xdiff_outf(),
224  * ripped from git and modified to use globals instead of
225  * a special callback-struct.
226  */
227 char *diffbuf = NULL;
228 int buflen = 0;
229
230 int filediff_cb(void *priv, mmbuffer_t *mb, int nbuf)
231 {
232         int i;
233
234         for (i = 0; i < nbuf; i++) {
235                 if (mb[i].ptr[mb[i].size-1] != '\n') {
236                         /* Incomplete line */
237                         diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
238                         memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
239                         buflen += mb[i].size;
240                         continue;
241                 }
242
243                 /* we have a complete line */
244                 if (!diffbuf) {
245                         ((linediff_fn)priv)(mb[i].ptr, mb[i].size);
246                         continue;
247                 }
248                 diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
249                 memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
250                 ((linediff_fn)priv)(diffbuf, buflen + mb[i].size);
251                 free(diffbuf);
252                 diffbuf = NULL;
253                 buflen = 0;
254         }
255         if (diffbuf) {
256                 ((linediff_fn)priv)(diffbuf, buflen);
257                 free(diffbuf);
258                 diffbuf = NULL;
259                 buflen = 0;
260         }
261         return 0;
262 }
263
264 int cgit_diff_files(const unsigned char *old_sha1,
265                     const unsigned char *new_sha1, unsigned long *old_size,
266                     unsigned long *new_size, int *binary, int context,
267                     int ignorews, linediff_fn fn)
268 {
269         mmfile_t file1, file2;
270         xpparam_t diff_params;
271         xdemitconf_t emit_params;
272         xdemitcb_t emit_cb;
273
274         if (!load_mmfile(&file1, old_sha1) || !load_mmfile(&file2, new_sha1))
275                 return 1;
276
277         *old_size = file1.size;
278         *new_size = file2.size;
279
280         if ((file1.ptr && buffer_is_binary(file1.ptr, file1.size)) ||
281             (file2.ptr && buffer_is_binary(file2.ptr, file2.size))) {
282                 *binary = 1;
283                 if (file1.size)
284                         free(file1.ptr);
285                 if (file2.size)
286                         free(file2.ptr);
287                 return 0;
288         }
289
290         memset(&diff_params, 0, sizeof(diff_params));
291         memset(&emit_params, 0, sizeof(emit_params));
292         memset(&emit_cb, 0, sizeof(emit_cb));
293         diff_params.flags = XDF_NEED_MINIMAL;
294         if (ignorews)
295                 diff_params.flags |= XDF_IGNORE_WHITESPACE;
296         emit_params.ctxlen = context > 0 ? context : 3;
297         emit_params.flags = XDL_EMIT_FUNCNAMES;
298         emit_cb.outf = filediff_cb;
299         emit_cb.priv = fn;
300         xdl_diff(&file1, &file2, &diff_params, &emit_params, &emit_cb);
301         if (file1.size)
302                 free(file1.ptr);
303         if (file2.size)
304                 free(file2.ptr);
305         return 0;
306 }
307
308 void cgit_diff_tree(const unsigned char *old_sha1,
309                     const unsigned char *new_sha1,
310                     filepair_fn fn, const char *prefix, int ignorews)
311 {
312         struct diff_options opt;
313         int ret;
314         int prefixlen;
315
316         diff_setup(&opt);
317         opt.output_format = DIFF_FORMAT_CALLBACK;
318         opt.detect_rename = 1;
319         opt.rename_limit = ctx.cfg.renamelimit;
320         DIFF_OPT_SET(&opt, RECURSIVE);
321         if (ignorews)
322                 DIFF_XDL_SET(&opt, IGNORE_WHITESPACE);
323         opt.format_callback = cgit_diff_tree_cb;
324         opt.format_callback_data = fn;
325         if (prefix) {
326                 opt.nr_paths = 1;
327                 opt.paths = &prefix;
328                 prefixlen = strlen(prefix);
329                 opt.pathlens = &prefixlen;
330         }
331         diff_setup_done(&opt);
332
333         if (old_sha1 && !is_null_sha1(old_sha1))
334                 ret = diff_tree_sha1(old_sha1, new_sha1, "", &opt);
335         else
336                 ret = diff_root_tree_sha1(new_sha1, "", &opt);
337         diffcore_std(&opt);
338         diff_flush(&opt);
339 }
340
341 void cgit_diff_commit(struct commit *commit, filepair_fn fn, const char *prefix)
342 {
343         unsigned char *old_sha1 = NULL;
344
345         if (commit->parents)
346                 old_sha1 = commit->parents->item->object.sha1;
347         cgit_diff_tree(old_sha1, commit->object.sha1, fn, prefix,
348                        ctx.qry.ignorews);
349 }
350
351 int cgit_parse_snapshots_mask(const char *str)
352 {
353         const struct cgit_snapshot_format *f;
354         static const char *delim = " \t,:/|;";
355         int tl, sl, rv = 0;
356
357         /* favor legacy setting */
358         if(atoi(str))
359                 return 1;
360         for(;;) {
361                 str += strspn(str,delim);
362                 tl = strcspn(str,delim);
363                 if (!tl)
364                         break;
365                 for (f = cgit_snapshot_formats; f->suffix; f++) {
366                         sl = strlen(f->suffix);
367                         if((tl == sl && !strncmp(f->suffix, str, tl)) ||
368                            (tl == sl-1 && !strncmp(f->suffix+1, str, tl-1))) {
369                                 rv |= f->bit;
370                                 break;
371                         }
372                 }
373                 str += tl;
374         }
375         return rv;
376 }
377
378 int cgit_open_filter(struct cgit_filter *filter)
379 {
380
381         filter->old_stdout = chk_positive(dup(STDOUT_FILENO),
382                 "Unable to duplicate STDOUT");
383         chk_zero(pipe(filter->pipe_fh), "Unable to create pipe to subprocess");
384         filter->pid = chk_non_negative(fork(), "Unable to create subprocess");
385         if (filter->pid == 0) {
386                 close(filter->pipe_fh[1]);
387                 chk_non_negative(dup2(filter->pipe_fh[0], STDIN_FILENO),
388                         "Unable to use pipe as STDIN");
389                 execvp(filter->cmd, filter->argv);
390                 die("Unable to exec subprocess %s: %s (%d)", filter->cmd,
391                         strerror(errno), errno);
392         }
393         close(filter->pipe_fh[0]);
394         chk_non_negative(dup2(filter->pipe_fh[1], STDOUT_FILENO),
395                 "Unable to use pipe as STDOUT");
396         close(filter->pipe_fh[1]);
397         return 0;
398 }
399
400 int cgit_close_filter(struct cgit_filter *filter)
401 {
402         chk_non_negative(dup2(filter->old_stdout, STDOUT_FILENO),
403                 "Unable to restore STDOUT");
404         close(filter->old_stdout);
405         if (filter->pid < 0)
406                 return 0;
407         waitpid(filter->pid, &filter->exitstatus, 0);
408         if (WIFEXITED(filter->exitstatus) && !WEXITSTATUS(filter->exitstatus))
409                 return 0;
410         die("Subprocess %s exited abnormally", filter->cmd);
411 }
412
413 /* Read the content of the specified file into a newly allocated buffer,
414  * zeroterminate the buffer and return 0 on success, errno otherwise.
415  */
416 int readfile(const char *path, char **buf, size_t *size)
417 {
418         int fd, e;
419         struct stat st;
420
421         fd = open(path, O_RDONLY);
422         if (fd == -1)
423                 return errno;
424         if (fstat(fd, &st)) {
425                 e = errno;
426                 close(fd);
427                 return e;
428         }
429         if (!S_ISREG(st.st_mode)) {
430                 close(fd);
431                 return EISDIR;
432         }
433         *buf = xmalloc(st.st_size + 1);
434         *size = read_in_full(fd, *buf, st.st_size);
435         e = errno;
436         (*buf)[*size] = '\0';
437         close(fd);
438         return (*size == st.st_size ? 0 : e);
439 }
440
441 int is_token_char(char c)
442 {
443         return isalnum(c) || c == '_';
444 }
445
446 /* Replace name with getenv(name), return pointer to zero-terminating char
447  */
448 char *expand_macro(char *name, int maxlength)
449 {
450         char *value;
451         int len;
452
453         len = 0;
454         value = getenv(name);
455         if (value) {
456                 len = strlen(value);
457                 if (len > maxlength)
458                         len = maxlength;
459                 strncpy(name, value, len);
460         }
461         return name + len;
462 }
463
464 #define EXPBUFSIZE (1024 * 8)
465
466 /* Replace all tokens prefixed by '$' in the specified text with the
467  * value of the named environment variable.
468  * NB: the return value is a static buffer, i.e. it must be strdup'd
469  * by the caller.
470  */
471 char *expand_macros(const char *txt)
472 {
473         static char result[EXPBUFSIZE];
474         char *p, *start;
475         int len;
476
477         p = result;
478         start = NULL;
479         while (p < result + EXPBUFSIZE - 1 && txt && *txt) {
480                 *p = *txt;
481                 if (start) {
482                         if (!is_token_char(*txt)) {
483                                 if (p - start > 0) {
484                                         *p = '\0';
485                                         len = result + EXPBUFSIZE - start - 1;
486                                         p = expand_macro(start, len) - 1;
487                                 }
488                                 start = NULL;
489                                 txt--;
490                         }
491                         p++;
492                         txt++;
493                         continue;
494                 }
495                 if (*txt == '$') {
496                         start = p;
497                         txt++;
498                         continue;
499                 }
500                 p++;
501                 txt++;
502         }
503         *p = '\0';
504         if (start && p - start > 0) {
505                 len = result + EXPBUFSIZE - start - 1;
506                 p = expand_macro(start, len);
507                 *p = '\0';
508         }
509         return result;
510 }