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rebase -p: fix quoting when calling `git merge`
[git/debian.git] / ident.c
blob327abe557f5a66546665664511d3e71b7f0929e7
1 /*
2 * ident.c
3 *
4 * create git identifier lines of the form "name <email> date"
5 *
6 * Copyright (C) 2005 Linus Torvalds
7 */
8 #include "cache.h"
9 #include "config.h"
10
11 static struct strbuf git_default_name = STRBUF_INIT;
12 static struct strbuf git_default_email = STRBUF_INIT;
13 static struct strbuf git_default_date = STRBUF_INIT;
14 static int default_email_is_bogus;
15 static int default_name_is_bogus;
16
17 static int ident_use_config_only;
18
19 #define IDENT_NAME_GIVEN 01
20 #define IDENT_MAIL_GIVEN 02
21 #define IDENT_ALL_GIVEN (IDENT_NAME_GIVEN|IDENT_MAIL_GIVEN)
22 static int committer_ident_explicitly_given;
23 static int author_ident_explicitly_given;
24 static int ident_config_given;
25
26 #ifdef NO_GECOS_IN_PWENT
27 #define get_gecos(ignored) "&"
28 #else
29 #define get_gecos(struct_passwd) ((struct_passwd)->pw_gecos)
30 #endif
31
32 static struct passwd *xgetpwuid_self(int *is_bogus)
33 {
34 struct passwd *pw;
35
36 errno = 0;
37 pw = getpwuid(getuid());
38 if (!pw) {
39 static struct passwd fallback;
40 fallback.pw_name = "unknown";
41 #ifndef NO_GECOS_IN_PWENT
42 fallback.pw_gecos = "Unknown";
43 #endif
44 pw = &fallback;
45 if (is_bogus)
46 *is_bogus = 1;
47 }
48 return pw;
49 }
50
51 static void copy_gecos(const struct passwd *w, struct strbuf *name)
52 {
53 char *src;
54
55 /* Traditionally GECOS field had office phone numbers etc, separated
56 * with commas. Also & stands for capitalized form of the login name.
57 */
58
59 for (src = get_gecos(w); *src && *src != ','; src++) {
60 int ch = *src;
61 if (ch != '&')
62 strbuf_addch(name, ch);
63 else {
64 /* Sorry, Mr. McDonald... */
65 strbuf_addch(name, toupper(*w->pw_name));
66 strbuf_addstr(name, w->pw_name + 1);
67 }
68 }
69 }
70
71 static int add_mailname_host(struct strbuf *buf)
72 {
73 FILE *mailname;
74 struct strbuf mailnamebuf = STRBUF_INIT;
75
76 mailname = fopen_or_warn("/etc/mailname", "r");
77 if (!mailname)
78 return -1;
79
80 if (strbuf_getline(&mailnamebuf, mailname) == EOF) {
81 if (ferror(mailname))
82 warning_errno("cannot read /etc/mailname");
83 strbuf_release(&mailnamebuf);
84 fclose(mailname);
85 return -1;
86 }
87 /* success! */
88 strbuf_addbuf(buf, &mailnamebuf);
89 strbuf_release(&mailnamebuf);
90 fclose(mailname);
91 return 0;
92 }
93
94 static int canonical_name(const char *host, struct strbuf *out)
95 {
96 int status = -1;
97
98 #ifndef NO_IPV6
99 struct addrinfo hints, *ai;
100 memset (&hints, '\0', sizeof (hints));
101 hints.ai_flags = AI_CANONNAME;
102 if (!getaddrinfo(host, NULL, &hints, &ai)) {
103 if (ai && ai->ai_canonname && strchr(ai->ai_canonname, '.')) {
104 strbuf_addstr(out, ai->ai_canonname);
105 status = 0;
106 }
107 freeaddrinfo(ai);
108 }
109 #else
110 struct hostent *he = gethostbyname(host);
111 if (he && strchr(he->h_name, '.')) {
112 strbuf_addstr(out, he->h_name);
113 status = 0;
114 }
115 #endif /* NO_IPV6 */
116
117 return status;
118 }
119
120 static void add_domainname(struct strbuf *out, int *is_bogus)
121 {
122 char buf[HOST_NAME_MAX + 1];
123
124 if (xgethostname(buf, sizeof(buf))) {
125 warning_errno("cannot get host name");
126 strbuf_addstr(out, "(none)");
127 *is_bogus = 1;
128 return;
129 }
130 if (strchr(buf, '.'))
131 strbuf_addstr(out, buf);
132 else if (canonical_name(buf, out) < 0) {
133 strbuf_addf(out, "%s.(none)", buf);
134 *is_bogus = 1;
135 }
136 }
137
138 static void copy_email(const struct passwd *pw, struct strbuf *email,
139 int *is_bogus)
140 {
141 /*
142 * Make up a fake email address
143 * (name + '@' + hostname [+ '.' + domainname])
144 */
145 strbuf_addstr(email, pw->pw_name);
146 strbuf_addch(email, '@');
147
148 if (!add_mailname_host(email))
149 return; /* read from "/etc/mailname" (Debian) */
150 add_domainname(email, is_bogus);
151 }
152
153 const char *ident_default_name(void)
154 {
155 if (!(ident_config_given & IDENT_NAME_GIVEN) && !git_default_name.len) {
156 copy_gecos(xgetpwuid_self(&default_name_is_bogus), &git_default_name);
157 strbuf_trim(&git_default_name);
158 }
159 return git_default_name.buf;
160 }
161
162 const char *ident_default_email(void)
163 {
164 if (!(ident_config_given & IDENT_MAIL_GIVEN) && !git_default_email.len) {
165 const char *email = getenv("EMAIL");
166
167 if (email && email[0]) {
168 strbuf_addstr(&git_default_email, email);
169 committer_ident_explicitly_given |= IDENT_MAIL_GIVEN;
170 author_ident_explicitly_given |= IDENT_MAIL_GIVEN;
171 } else
172 copy_email(xgetpwuid_self(&default_email_is_bogus),
173 &git_default_email, &default_email_is_bogus);
174 strbuf_trim(&git_default_email);
175 }
176 return git_default_email.buf;
177 }
178
179 static const char *ident_default_date(void)
180 {
181 if (!git_default_date.len)
182 datestamp(&git_default_date);
183 return git_default_date.buf;
184 }
185
186 void reset_ident_date(void)
187 {
188 strbuf_reset(&git_default_date);
189 }
190
191 static int crud(unsigned char c)
192 {
193 return c <= 32 ||
194 c == '.' ||
195 c == ',' ||
196 c == ':' ||
197 c == ';' ||
198 c == '<' ||
199 c == '>' ||
200 c == '"' ||
201 c == '\\' ||
202 c == '\'';
203 }
204
205 static int has_non_crud(const char *str)
206 {
207 for (; *str; str++) {
208 if (!crud(*str))
209 return 1;
210 }
211 return 0;
212 }
213
214 /*
215 * Copy over a string to the destination, but avoid special
216 * characters ('\n', '<' and '>') and remove crud at the end
217 */
218 static void strbuf_addstr_without_crud(struct strbuf *sb, const char *src)
219 {
220 size_t i, len;
221 unsigned char c;
222
223 /* Remove crud from the beginning.. */
224 while ((c = *src) != 0) {
225 if (!crud(c))
226 break;
227 src++;
228 }
229
230 /* Remove crud from the end.. */
231 len = strlen(src);
232 while (len > 0) {
233 c = src[len-1];
234 if (!crud(c))
235 break;
236 --len;
237 }
238
239 /*
240 * Copy the rest to the buffer, but avoid the special
241 * characters '\n' '<' and '>' that act as delimiters on
242 * an identification line. We can only remove crud, never add it,
243 * so 'len' is our maximum.
244 */
245 strbuf_grow(sb, len);
246 for (i = 0; i < len; i++) {
247 c = *src++;
248 switch (c) {
249 case '\n': case '<': case '>':
250 continue;
251 }
252 sb->buf[sb->len++] = c;
253 }
254 sb->buf[sb->len] = '\0';
255 }
256
257 /*
258 * Reverse of fmt_ident(); given an ident line, split the fields
259 * to allow the caller to parse it.
260 * Signal a success by returning 0, but date/tz fields of the result
261 * can still be NULL if the input line only has the name/email part
262 * (e.g. reading from a reflog entry).
263 */
264 int split_ident_line(struct ident_split *split, const char *line, int len)
265 {
266 const char *cp;
267 size_t span;
268 int status = -1;
269
270 memset(split, 0, sizeof(*split));
271
272 split->name_begin = line;
273 for (cp = line; *cp && cp < line + len; cp++)
274 if (*cp == '<') {
275 split->mail_begin = cp + 1;
276 break;
277 }
278 if (!split->mail_begin)
279 return status;
280
281 for (cp = split->mail_begin - 2; line <= cp; cp--)
282 if (!isspace(*cp)) {
283 split->name_end = cp + 1;
284 break;
285 }
286 if (!split->name_end) {
287 /* no human readable name */
288 split->name_end = split->name_begin;
289 }
290
291 for (cp = split->mail_begin; cp < line + len; cp++)
292 if (*cp == '>') {
293 split->mail_end = cp;
294 break;
295 }
296 if (!split->mail_end)
297 return status;
298
299 /*
300 * Look from the end-of-line to find the trailing ">" of the mail
301 * address, even though we should already know it as split->mail_end.
302 * This can help in cases of broken idents with an extra ">" somewhere
303 * in the email address. Note that we are assuming the timestamp will
304 * never have a ">" in it.
305 *
306 * Note that we will always find some ">" before going off the front of
307 * the string, because will always hit the split->mail_end closing
308 * bracket.
309 */
310 for (cp = line + len - 1; *cp != '>'; cp--)
311 ;
312
313 for (cp = cp + 1; cp < line + len && isspace(*cp); cp++)
314 ;
315 if (line + len <= cp)
316 goto person_only;
317 split->date_begin = cp;
318 span = strspn(cp, "0123456789");
319 if (!span)
320 goto person_only;
321 split->date_end = split->date_begin + span;
322 for (cp = split->date_end; cp < line + len && isspace(*cp); cp++)
323 ;
324 if (line + len <= cp || (*cp != '+' && *cp != '-'))
325 goto person_only;
326 split->tz_begin = cp;
327 span = strspn(cp + 1, "0123456789");
328 if (!span)
329 goto person_only;
330 split->tz_end = split->tz_begin + 1 + span;
331 return 0;
332
333 person_only:
334 split->date_begin = NULL;
335 split->date_end = NULL;
336 split->tz_begin = NULL;
337 split->tz_end = NULL;
338 return 0;
339 }
340
341 static const char *env_hint =
342 N_("\n"
343 "*** Please tell me who you are.\n"
344 "\n"
345 "Run\n"
346 "\n"
347 " git config --global user.email \"you@example.com\"\n"
348 " git config --global user.name \"Your Name\"\n"
349 "\n"
350 "to set your account\'s default identity.\n"
351 "Omit --global to set the identity only in this repository.\n"
352 "\n");
353
354 const char *fmt_ident(const char *name, const char *email,
355 const char *date_str, int flag)
356 {
357 static struct strbuf ident = STRBUF_INIT;
358 int strict = (flag & IDENT_STRICT);
359 int want_date = !(flag & IDENT_NO_DATE);
360 int want_name = !(flag & IDENT_NO_NAME);
361
362 if (!email) {
363 if (strict && ident_use_config_only
364 && !(ident_config_given & IDENT_MAIL_GIVEN)) {
365 fputs(_(env_hint), stderr);
366 die(_("no email was given and auto-detection is disabled"));
367 }
368 email = ident_default_email();
369 if (strict && default_email_is_bogus) {
370 fputs(_(env_hint), stderr);
371 die(_("unable to auto-detect email address (got '%s')"), email);
372 }
373 }
374
375 if (want_name) {
376 int using_default = 0;
377 if (!name) {
378 if (strict && ident_use_config_only
379 && !(ident_config_given & IDENT_NAME_GIVEN)) {
380 fputs(_(env_hint), stderr);
381 die(_("no name was given and auto-detection is disabled"));
382 }
383 name = ident_default_name();
384 using_default = 1;
385 if (strict && default_name_is_bogus) {
386 fputs(_(env_hint), stderr);
387 die(_("unable to auto-detect name (got '%s')"), name);
388 }
389 }
390 if (!*name) {
391 struct passwd *pw;
392 if (strict) {
393 if (using_default)
394 fputs(_(env_hint), stderr);
395 die(_("empty ident name (for <%s>) not allowed"), email);
396 }
397 pw = xgetpwuid_self(NULL);
398 name = pw->pw_name;
399 }
400 if (strict && !has_non_crud(name))
401 die(_("name consists only of disallowed characters: %s"), name);
402 }
403
404 strbuf_reset(&ident);
405 if (want_name) {
406 strbuf_addstr_without_crud(&ident, name);
407 strbuf_addstr(&ident, " <");
408 }
409 strbuf_addstr_without_crud(&ident, email);
410 if (want_name)
411 strbuf_addch(&ident, '>');
412 if (want_date) {
413 strbuf_addch(&ident, ' ');
414 if (date_str && date_str[0]) {
415 if (parse_date(date_str, &ident) < 0)
416 die(_("invalid date format: %s"), date_str);
417 }
418 else
419 strbuf_addstr(&ident, ident_default_date());
420 }
421
422 return ident.buf;
423 }
424
425 const char *fmt_name(const char *name, const char *email)
426 {
427 return fmt_ident(name, email, NULL, IDENT_STRICT | IDENT_NO_DATE);
428 }
429
430 const char *git_author_info(int flag)
431 {
432 if (getenv("GIT_AUTHOR_NAME"))
433 author_ident_explicitly_given |= IDENT_NAME_GIVEN;
434 if (getenv("GIT_AUTHOR_EMAIL"))
435 author_ident_explicitly_given |= IDENT_MAIL_GIVEN;
436 return fmt_ident(getenv("GIT_AUTHOR_NAME"),
437 getenv("GIT_AUTHOR_EMAIL"),
438 getenv("GIT_AUTHOR_DATE"),
439 flag);
440 }
441
442 const char *git_committer_info(int flag)
443 {
444 if (getenv("GIT_COMMITTER_NAME"))
445 committer_ident_explicitly_given |= IDENT_NAME_GIVEN;
446 if (getenv("GIT_COMMITTER_EMAIL"))
447 committer_ident_explicitly_given |= IDENT_MAIL_GIVEN;
448 return fmt_ident(getenv("GIT_COMMITTER_NAME"),
449 getenv("GIT_COMMITTER_EMAIL"),
450 getenv("GIT_COMMITTER_DATE"),
451 flag);
452 }
453
454 static int ident_is_sufficient(int user_ident_explicitly_given)
455 {
456 #ifndef WINDOWS
457 return (user_ident_explicitly_given & IDENT_MAIL_GIVEN);
458 #else
459 return (user_ident_explicitly_given == IDENT_ALL_GIVEN);
460 #endif
461 }
462
463 int committer_ident_sufficiently_given(void)
464 {
465 return ident_is_sufficient(committer_ident_explicitly_given);
466 }
467
468 int author_ident_sufficiently_given(void)
469 {
470 return ident_is_sufficient(author_ident_explicitly_given);
471 }
472
473 int git_ident_config(const char *var, const char *value, void *data)
474 {
475 if (!strcmp(var, "user.useconfigonly")) {
476 ident_use_config_only = git_config_bool(var, value);
477 return 0;
478 }
479
480 if (!strcmp(var, "user.name")) {
481 if (!value)
482 return config_error_nonbool(var);
483 strbuf_reset(&git_default_name);
484 strbuf_addstr(&git_default_name, value);
485 committer_ident_explicitly_given |= IDENT_NAME_GIVEN;
486 author_ident_explicitly_given |= IDENT_NAME_GIVEN;
487 ident_config_given |= IDENT_NAME_GIVEN;
488 return 0;
489 }
490
491 if (!strcmp(var, "user.email")) {
492 if (!value)
493 return config_error_nonbool(var);
494 strbuf_reset(&git_default_email);
495 strbuf_addstr(&git_default_email, value);
496 committer_ident_explicitly_given |= IDENT_MAIL_GIVEN;
497 author_ident_explicitly_given |= IDENT_MAIL_GIVEN;
498 ident_config_given |= IDENT_MAIL_GIVEN;
499 return 0;
500 }
501
502 return 0;
503 }
504
505 static int buf_cmp(const char *a_begin, const char *a_end,
506 const char *b_begin, const char *b_end)
507 {
508 int a_len = a_end - a_begin;
509 int b_len = b_end - b_begin;
510 int min = a_len < b_len ? a_len : b_len;
511 int cmp;
512
513 cmp = memcmp(a_begin, b_begin, min);
514 if (cmp)
515 return cmp;
516
517 return a_len - b_len;
518 }
519
520 int ident_cmp(const struct ident_split *a,
521 const struct ident_split *b)
522 {
523 int cmp;
524
525 cmp = buf_cmp(a->mail_begin, a->mail_end,
526 b->mail_begin, b->mail_end);
527 if (cmp)
528 return cmp;
529
530 return buf_cmp(a->name_begin, a->name_end,
531 b->name_begin, b->name_end);
532 }
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