shared.c (view raw)
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#include <stdio.h>
11
12struct cgit_repolist cgit_repolist;
13struct cgit_context ctx;
14
15int chk_zero(int result, char *msg)
16{
17 if (result != 0)
18 die("%s: %s", msg, strerror(errno));
19 return result;
20}
21
22int chk_positive(int result, char *msg)
23{
24 if (result <= 0)
25 die("%s: %s", msg, strerror(errno));
26 return result;
27}
28
29int chk_non_negative(int result, char *msg)
30{
31 if (result < 0)
32 die("%s: %s", msg, strerror(errno));
33 return result;
34}
35
36char *cgit_default_repo_desc = "[no description]";
37struct cgit_repo *cgit_add_repo(const char *url)
38{
39 struct cgit_repo *ret;
40
41 if (++cgit_repolist.count > cgit_repolist.length) {
42 if (cgit_repolist.length == 0)
43 cgit_repolist.length = 8;
44 else
45 cgit_repolist.length *= 2;
46 cgit_repolist.repos = xrealloc(cgit_repolist.repos,
47 cgit_repolist.length *
48 sizeof(struct cgit_repo));
49 }
50
51 ret = &cgit_repolist.repos[cgit_repolist.count-1];
52 memset(ret, 0, sizeof(struct cgit_repo));
53 ret->url = trim_end(url, '/');
54 ret->name = ret->url;
55 ret->path = NULL;
56 ret->desc = cgit_default_repo_desc;
57 ret->owner = NULL;
58 ret->section = ctx.cfg.section;
59 ret->snapshots = ctx.cfg.snapshots;
60 ret->enable_commit_graph = ctx.cfg.enable_commit_graph;
61 ret->enable_log_filecount = ctx.cfg.enable_log_filecount;
62 ret->enable_log_linecount = ctx.cfg.enable_log_linecount;
63 ret->enable_remote_branches = ctx.cfg.enable_remote_branches;
64 ret->enable_subject_links = ctx.cfg.enable_subject_links;
65 ret->max_stats = ctx.cfg.max_stats;
66 ret->commit_sort = ctx.cfg.commit_sort;
67 ret->module_link = ctx.cfg.module_link;
68 ret->readme = ctx.cfg.readme;
69 ret->mtime = -1;
70 ret->about_filter = ctx.cfg.about_filter;
71 ret->commit_filter = ctx.cfg.commit_filter;
72 ret->source_filter = ctx.cfg.source_filter;
73 ret->clone_url = ctx.cfg.clone_url;
74 ret->submodules.strdup_strings = 1;
75 return ret;
76}
77
78struct cgit_repo *cgit_get_repoinfo(const char *url)
79{
80 int i;
81 struct cgit_repo *repo;
82
83 for (i = 0; i < cgit_repolist.count; i++) {
84 repo = &cgit_repolist.repos[i];
85 if (!strcmp(repo->url, url))
86 return repo;
87 }
88 return NULL;
89}
90
91void *cgit_free_commitinfo(struct commitinfo *info)
92{
93 free(info->author);
94 free(info->author_email);
95 free(info->committer);
96 free(info->committer_email);
97 free(info->subject);
98 free(info->msg);
99 free(info->msg_encoding);
100 free(info);
101 return NULL;
102}
103
104char *trim_end(const char *str, char c)
105{
106 int len;
107
108 if (str == NULL)
109 return NULL;
110 len = strlen(str);
111 while (len > 0 && str[len - 1] == c)
112 len--;
113 if (len == 0)
114 return NULL;
115 return xstrndup(str, len);
116}
117
118char *ensure_end(const char *str, char c)
119{
120 size_t len = strlen(str);
121 char *result;
122
123 if (len && str[len - 1] == c)
124 return xstrndup(str, len);
125
126 result = xmalloc(len + 2);
127 memcpy(result, str, len);
128 result[len] = '/';
129 result[len + 1] = '\0';
130 return result;
131}
132
133void strbuf_ensure_end(struct strbuf *sb, char c)
134{
135 if (!sb->len || sb->buf[sb->len - 1] != c)
136 strbuf_addch(sb, c);
137}
138
139char *strlpart(char *txt, int maxlen)
140{
141 char *result;
142
143 if (!txt)
144 return txt;
145
146 if (strlen(txt) <= maxlen)
147 return txt;
148 result = xmalloc(maxlen + 1);
149 memcpy(result, txt, maxlen - 3);
150 result[maxlen-1] = result[maxlen-2] = result[maxlen-3] = '.';
151 result[maxlen] = '\0';
152 return result;
153}
154
155char *strrpart(char *txt, int maxlen)
156{
157 char *result;
158
159 if (!txt)
160 return txt;
161
162 if (strlen(txt) <= maxlen)
163 return txt;
164 result = xmalloc(maxlen + 1);
165 memcpy(result + 3, txt + strlen(txt) - maxlen + 4, maxlen - 3);
166 result[0] = result[1] = result[2] = '.';
167 return result;
168}
169
170void cgit_add_ref(struct reflist *list, struct refinfo *ref)
171{
172 size_t size;
173
174 if (list->count >= list->alloc) {
175 list->alloc += (list->alloc ? list->alloc : 4);
176 size = list->alloc * sizeof(struct refinfo *);
177 list->refs = xrealloc(list->refs, size);
178 }
179 list->refs[list->count++] = ref;
180}
181
182static struct refinfo *cgit_mk_refinfo(const char *refname, const unsigned char *sha1)
183{
184 struct refinfo *ref;
185
186 ref = xmalloc(sizeof (struct refinfo));
187 ref->refname = xstrdup(refname);
188 ref->object = parse_object(sha1);
189 switch (ref->object->type) {
190 case OBJ_TAG:
191 ref->tag = cgit_parse_tag((struct tag *)ref->object);
192 break;
193 case OBJ_COMMIT:
194 ref->commit = cgit_parse_commit((struct commit *)ref->object);
195 break;
196 }
197 return ref;
198}
199
200static void cgit_free_taginfo(struct taginfo *tag)
201{
202 if (tag->tagger)
203 free(tag->tagger);
204 if (tag->tagger_email)
205 free(tag->tagger_email);
206 if (tag->msg)
207 free(tag->msg);
208 free(tag);
209}
210
211static void cgit_free_refinfo(struct refinfo *ref)
212{
213 if (ref->refname)
214 free((char *)ref->refname);
215 switch (ref->object->type) {
216 case OBJ_TAG:
217 cgit_free_taginfo(ref->tag);
218 break;
219 case OBJ_COMMIT:
220 cgit_free_commitinfo(ref->commit);
221 break;
222 }
223 free(ref);
224}
225
226void cgit_free_reflist_inner(struct reflist *list)
227{
228 int i;
229
230 for (i = 0; i < list->count; i++) {
231 cgit_free_refinfo(list->refs[i]);
232 }
233 free(list->refs);
234}
235
236int cgit_refs_cb(const char *refname, const unsigned char *sha1, int flags,
237 void *cb_data)
238{
239 struct reflist *list = (struct reflist *)cb_data;
240 struct refinfo *info = cgit_mk_refinfo(refname, sha1);
241
242 if (info)
243 cgit_add_ref(list, info);
244 return 0;
245}
246
247static void cgit_diff_tree_cb(struct diff_queue_struct *q,
248 struct diff_options *options, void *data)
249{
250 int i;
251
252 for (i = 0; i < q->nr; i++) {
253 if (q->queue[i]->status == 'U')
254 continue;
255 ((filepair_fn)data)(q->queue[i]);
256 }
257}
258
259static int load_mmfile(mmfile_t *file, const unsigned char *sha1)
260{
261 enum object_type type;
262
263 if (is_null_sha1(sha1)) {
264 file->ptr = (char *)"";
265 file->size = 0;
266 } else {
267 file->ptr = read_sha1_file(sha1, &type,
268 (unsigned long *)&file->size);
269 }
270 return 1;
271}
272
273/*
274 * Receive diff-buffers from xdiff and concatenate them as
275 * needed across multiple callbacks.
276 *
277 * This is basically a copy of xdiff-interface.c/xdiff_outf(),
278 * ripped from git and modified to use globals instead of
279 * a special callback-struct.
280 */
281char *diffbuf = NULL;
282int buflen = 0;
283
284static int filediff_cb(void *priv, mmbuffer_t *mb, int nbuf)
285{
286 int i;
287
288 for (i = 0; i < nbuf; i++) {
289 if (mb[i].ptr[mb[i].size-1] != '\n') {
290 /* Incomplete line */
291 diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
292 memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
293 buflen += mb[i].size;
294 continue;
295 }
296
297 /* we have a complete line */
298 if (!diffbuf) {
299 ((linediff_fn)priv)(mb[i].ptr, mb[i].size);
300 continue;
301 }
302 diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
303 memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
304 ((linediff_fn)priv)(diffbuf, buflen + mb[i].size);
305 free(diffbuf);
306 diffbuf = NULL;
307 buflen = 0;
308 }
309 if (diffbuf) {
310 ((linediff_fn)priv)(diffbuf, buflen);
311 free(diffbuf);
312 diffbuf = NULL;
313 buflen = 0;
314 }
315 return 0;
316}
317
318int cgit_diff_files(const unsigned char *old_sha1,
319 const unsigned char *new_sha1, unsigned long *old_size,
320 unsigned long *new_size, int *binary, int context,
321 int ignorews, linediff_fn fn)
322{
323 mmfile_t file1, file2;
324 xpparam_t diff_params;
325 xdemitconf_t emit_params;
326 xdemitcb_t emit_cb;
327
328 if (!load_mmfile(&file1, old_sha1) || !load_mmfile(&file2, new_sha1))
329 return 1;
330
331 *old_size = file1.size;
332 *new_size = file2.size;
333
334 if ((file1.ptr && buffer_is_binary(file1.ptr, file1.size)) ||
335 (file2.ptr && buffer_is_binary(file2.ptr, file2.size))) {
336 *binary = 1;
337 if (file1.size)
338 free(file1.ptr);
339 if (file2.size)
340 free(file2.ptr);
341 return 0;
342 }
343
344 memset(&diff_params, 0, sizeof(diff_params));
345 memset(&emit_params, 0, sizeof(emit_params));
346 memset(&emit_cb, 0, sizeof(emit_cb));
347 diff_params.flags = XDF_NEED_MINIMAL;
348 if (ignorews)
349 diff_params.flags |= XDF_IGNORE_WHITESPACE;
350 emit_params.ctxlen = context > 0 ? context : 3;
351 emit_params.flags = XDL_EMIT_FUNCNAMES;
352 emit_cb.outf = filediff_cb;
353 emit_cb.priv = fn;
354 xdl_diff(&file1, &file2, &diff_params, &emit_params, &emit_cb);
355 if (file1.size)
356 free(file1.ptr);
357 if (file2.size)
358 free(file2.ptr);
359 return 0;
360}
361
362void cgit_diff_tree(const unsigned char *old_sha1,
363 const unsigned char *new_sha1,
364 filepair_fn fn, const char *prefix, int ignorews)
365{
366 struct diff_options opt;
367 struct pathspec_item item;
368
369 diff_setup(&opt);
370 opt.output_format = DIFF_FORMAT_CALLBACK;
371 opt.detect_rename = 1;
372 opt.rename_limit = ctx.cfg.renamelimit;
373 DIFF_OPT_SET(&opt, RECURSIVE);
374 if (ignorews)
375 DIFF_XDL_SET(&opt, IGNORE_WHITESPACE);
376 opt.format_callback = cgit_diff_tree_cb;
377 opt.format_callback_data = fn;
378 if (prefix) {
379 item.match = prefix;
380 item.len = strlen(prefix);
381 opt.pathspec.nr = 1;
382 opt.pathspec.items = &item;
383 }
384 diff_setup_done(&opt);
385
386 if (old_sha1 && !is_null_sha1(old_sha1))
387 diff_tree_sha1(old_sha1, new_sha1, "", &opt);
388 else
389 diff_root_tree_sha1(new_sha1, "", &opt);
390 diffcore_std(&opt);
391 diff_flush(&opt);
392}
393
394void cgit_diff_commit(struct commit *commit, filepair_fn fn, const char *prefix)
395{
396 unsigned char *old_sha1 = NULL;
397
398 if (commit->parents)
399 old_sha1 = commit->parents->item->object.sha1;
400 cgit_diff_tree(old_sha1, commit->object.sha1, fn, prefix,
401 ctx.qry.ignorews);
402}
403
404int cgit_parse_snapshots_mask(const char *str)
405{
406 const struct cgit_snapshot_format *f;
407 static const char *delim = " \t,:/|;";
408 int tl, sl, rv = 0;
409
410 /* favor legacy setting */
411 if (atoi(str))
412 return 1;
413 for (;;) {
414 str += strspn(str, delim);
415 tl = strcspn(str, delim);
416 if (!tl)
417 break;
418 for (f = cgit_snapshot_formats; f->suffix; f++) {
419 sl = strlen(f->suffix);
420 if ((tl == sl && !strncmp(f->suffix, str, tl)) ||
421 (tl == sl - 1 && !strncmp(f->suffix + 1, str, tl - 1))) {
422 rv |= f->bit;
423 break;
424 }
425 }
426 str += tl;
427 }
428 return rv;
429}
430
431typedef struct {
432 char * name;
433 char * value;
434} cgit_env_var;
435
436void cgit_prepare_repo_env(struct cgit_repo * repo)
437{
438 cgit_env_var env_vars[] = {
439 { .name = "CGIT_REPO_URL", .value = repo->url },
440 { .name = "CGIT_REPO_NAME", .value = repo->name },
441 { .name = "CGIT_REPO_PATH", .value = repo->path },
442 { .name = "CGIT_REPO_OWNER", .value = repo->owner },
443 { .name = "CGIT_REPO_DEFBRANCH", .value = repo->defbranch },
444 { .name = "CGIT_REPO_SECTION", .value = repo->section },
445 { .name = "CGIT_REPO_CLONE_URL", .value = repo->clone_url }
446 };
447 int env_var_count = ARRAY_SIZE(env_vars);
448 cgit_env_var *p, *q;
449 static char *warn = "cgit warning: failed to set env: %s=%s\n";
450
451 p = env_vars;
452 q = p + env_var_count;
453 for (; p < q; p++)
454 if (p->value && setenv(p->name, p->value, 1))
455 fprintf(stderr, warn, p->name, p->value);
456}
457
458int cgit_open_filter(struct cgit_filter *filter)
459{
460
461 filter->old_stdout = chk_positive(dup(STDOUT_FILENO),
462 "Unable to duplicate STDOUT");
463 chk_zero(pipe(filter->pipe_fh), "Unable to create pipe to subprocess");
464 filter->pid = chk_non_negative(fork(), "Unable to create subprocess");
465 if (filter->pid == 0) {
466 close(filter->pipe_fh[1]);
467 chk_non_negative(dup2(filter->pipe_fh[0], STDIN_FILENO),
468 "Unable to use pipe as STDIN");
469 execvp(filter->cmd, filter->argv);
470 die("Unable to exec subprocess %s: %s (%d)", filter->cmd,
471 strerror(errno), errno);
472 }
473 close(filter->pipe_fh[0]);
474 chk_non_negative(dup2(filter->pipe_fh[1], STDOUT_FILENO),
475 "Unable to use pipe as STDOUT");
476 close(filter->pipe_fh[1]);
477 return 0;
478}
479
480int cgit_close_filter(struct cgit_filter *filter)
481{
482 chk_non_negative(dup2(filter->old_stdout, STDOUT_FILENO),
483 "Unable to restore STDOUT");
484 close(filter->old_stdout);
485 if (filter->pid < 0)
486 return 0;
487 waitpid(filter->pid, &filter->exitstatus, 0);
488 if (WIFEXITED(filter->exitstatus) && !WEXITSTATUS(filter->exitstatus))
489 return 0;
490 die("Subprocess %s exited abnormally", filter->cmd);
491}
492
493/* Read the content of the specified file into a newly allocated buffer,
494 * zeroterminate the buffer and return 0 on success, errno otherwise.
495 */
496int readfile(const char *path, char **buf, size_t *size)
497{
498 int fd, e;
499 struct stat st;
500
501 fd = open(path, O_RDONLY);
502 if (fd == -1)
503 return errno;
504 if (fstat(fd, &st)) {
505 e = errno;
506 close(fd);
507 return e;
508 }
509 if (!S_ISREG(st.st_mode)) {
510 close(fd);
511 return EISDIR;
512 }
513 *buf = xmalloc(st.st_size + 1);
514 *size = read_in_full(fd, *buf, st.st_size);
515 e = errno;
516 (*buf)[*size] = '\0';
517 close(fd);
518 return (*size == st.st_size ? 0 : e);
519}
520
521static int is_token_char(char c)
522{
523 return isalnum(c) || c == '_';
524}
525
526/* Replace name with getenv(name), return pointer to zero-terminating char
527 */
528static char *expand_macro(char *name, int maxlength)
529{
530 char *value;
531 int len;
532
533 len = 0;
534 value = getenv(name);
535 if (value) {
536 len = strlen(value);
537 if (len > maxlength)
538 len = maxlength;
539 strncpy(name, value, len);
540 }
541 return name + len;
542}
543
544#define EXPBUFSIZE (1024 * 8)
545
546/* Replace all tokens prefixed by '$' in the specified text with the
547 * value of the named environment variable.
548 * NB: the return value is a static buffer, i.e. it must be strdup'd
549 * by the caller.
550 */
551char *expand_macros(const char *txt)
552{
553 static char result[EXPBUFSIZE];
554 char *p, *start;
555 int len;
556
557 p = result;
558 start = NULL;
559 while (p < result + EXPBUFSIZE - 1 && txt && *txt) {
560 *p = *txt;
561 if (start) {
562 if (!is_token_char(*txt)) {
563 if (p - start > 0) {
564 *p = '\0';
565 len = result + EXPBUFSIZE - start - 1;
566 p = expand_macro(start, len) - 1;
567 }
568 start = NULL;
569 txt--;
570 }
571 p++;
572 txt++;
573 continue;
574 }
575 if (*txt == '$') {
576 start = p;
577 txt++;
578 continue;
579 }
580 p++;
581 txt++;
582 }
583 *p = '\0';
584 if (start && p - start > 0) {
585 len = result + EXPBUFSIZE - start - 1;
586 p = expand_macro(start, len);
587 *p = '\0';
588 }
589 return result;
590}