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