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