getpwuid(mingw): provide a better default for the user name
[git/git.git] / ident.c
CommitLineData
6aa33f40
LT
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"
b2141fc1 9#include "config.h"
6aa33f40 10
8587ead7
JK
11static struct strbuf git_default_name = STRBUF_INIT;
12static struct strbuf git_default_email = STRBUF_INIT;
c33ddc2e 13static struct strbuf git_default_date = STRBUF_INIT;
19ce497c 14static int default_email_is_bogus;
92bcbb9b 15static int default_name_is_bogus;
45280230 16
4d5c2956
DA
17static int ident_use_config_only;
18
45280230
JK
19#define IDENT_NAME_GIVEN 01
20#define IDENT_MAIL_GIVEN 02
21#define IDENT_ALL_GIVEN (IDENT_NAME_GIVEN|IDENT_MAIL_GIVEN)
d6991cee
JK
22static int committer_ident_explicitly_given;
23static int author_ident_explicitly_given;
4d5c2956 24static int ident_config_given;
6aa33f40 25
590e081d
RG
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
92bcbb9b 32static struct passwd *xgetpwuid_self(int *is_bogus)
e850194c
JK
33{
34 struct passwd *pw;
35
36 errno = 0;
37 pw = getpwuid(getuid());
92bcbb9b
JK
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 }
e850194c
JK
48 return pw;
49}
50
8587ead7 51static void copy_gecos(const struct passwd *w, struct strbuf *name)
e9bacb4f 52{
8587ead7 53 char *src;
e9bacb4f
JH
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
8587ead7 59 for (src = get_gecos(w); *src && *src != ','; src++) {
e9bacb4f 60 int ch = *src;
8587ead7
JK
61 if (ch != '&')
62 strbuf_addch(name, ch);
63 else {
e9bacb4f 64 /* Sorry, Mr. McDonald... */
8587ead7
JK
65 strbuf_addch(name, toupper(*w->pw_name));
66 strbuf_addstr(name, w->pw_name + 1);
e9bacb4f
JH
67 }
68 }
e9bacb4f
JH
69}
70
8587ead7 71static int add_mailname_host(struct strbuf *buf)
8a55caa8
JN
72{
73 FILE *mailname;
dc342a25 74 struct strbuf mailnamebuf = STRBUF_INIT;
8a55caa8 75
e9d983f1
NTND
76 mailname = fopen_or_warn("/etc/mailname", "r");
77 if (!mailname)
8a55caa8 78 return -1;
e9d983f1 79
1f3b1efd 80 if (strbuf_getline(&mailnamebuf, mailname) == EOF) {
8a55caa8 81 if (ferror(mailname))
a26f4ed6 82 warning_errno("cannot read /etc/mailname");
dc342a25 83 strbuf_release(&mailnamebuf);
8a55caa8
JN
84 fclose(mailname);
85 return -1;
86 }
87 /* success! */
dc342a25
JN
88 strbuf_addbuf(buf, &mailnamebuf);
89 strbuf_release(&mailnamebuf);
8a55caa8
JN
90 fclose(mailname);
91 return 0;
92}
93
00bce77f
EP
94static 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)) {
c375a7ef 103 if (ai && ai->ai_canonname && strchr(ai->ai_canonname, '.')) {
00bce77f
EP
104 strbuf_addstr(out, ai->ai_canonname);
105 status = 0;
106 }
107 freeaddrinfo(ai);
108 }
109#else
58d29ece 110 struct hostent *he = gethostbyname(host);
00bce77f
EP
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
19ce497c 120static void add_domainname(struct strbuf *out, int *is_bogus)
8a55caa8 121{
da25bdb7 122 char buf[HOST_NAME_MAX + 1];
8a55caa8 123
5781a9a2 124 if (xgethostname(buf, sizeof(buf))) {
a26f4ed6 125 warning_errno("cannot get host name");
8587ead7 126 strbuf_addstr(out, "(none)");
19ce497c 127 *is_bogus = 1;
8a55caa8
JN
128 return;
129 }
8587ead7 130 if (strchr(buf, '.'))
f8254d32 131 strbuf_addstr(out, buf);
5498c57c 132 else if (canonical_name(buf, out) < 0) {
f8254d32 133 strbuf_addf(out, "%s.(none)", buf);
19ce497c
JK
134 *is_bogus = 1;
135 }
8a55caa8
JN
136}
137
19ce497c
JK
138static void copy_email(const struct passwd *pw, struct strbuf *email,
139 int *is_bogus)
6aa33f40 140{
01754769
JH
141 /*
142 * Make up a fake email address
143 * (name + '@' + hostname [+ '.' + domainname])
144 */
8587ead7
JK
145 strbuf_addstr(email, pw->pw_name);
146 strbuf_addch(email, '@');
147
148 if (!add_mailname_host(email))
8a55caa8 149 return; /* read from "/etc/mailname" (Debian) */
19ce497c 150 add_domainname(email, is_bogus);
01754769
JH
151}
152
9830534e 153const char *ident_default_name(void)
01754769 154{
94425552 155 if (!(ident_config_given & IDENT_NAME_GIVEN) && !git_default_name.len) {
92bcbb9b 156 copy_gecos(xgetpwuid_self(&default_name_is_bogus), &git_default_name);
be641abd 157 strbuf_trim(&git_default_name);
01754769 158 }
8587ead7 159 return git_default_name.buf;
bcb2b004 160}
01754769 161
bcb2b004
JK
162const char *ident_default_email(void)
163{
94425552 164 if (!(ident_config_given & IDENT_MAIL_GIVEN) && !git_default_email.len) {
46f74f00
MK
165 const char *email = getenv("EMAIL");
166
99178c83 167 if (email && email[0]) {
8587ead7 168 strbuf_addstr(&git_default_email, email);
d6991cee
JK
169 committer_ident_explicitly_given |= IDENT_MAIL_GIVEN;
170 author_ident_explicitly_given |= IDENT_MAIL_GIVEN;
2f705875 171 } else
92bcbb9b
JK
172 copy_email(xgetpwuid_self(&default_email_is_bogus),
173 &git_default_email, &default_email_is_bogus);
be641abd 174 strbuf_trim(&git_default_email);
01754769 175 }
8587ead7 176 return git_default_email.buf;
6aa33f40
LT
177}
178
dad148c3 179static const char *ident_default_date(void)
6aa33f40 180{
c33ddc2e
JK
181 if (!git_default_date.len)
182 datestamp(&git_default_date);
183 return git_default_date.buf;
6aa33f40
LT
184}
185
4d9c7e6f
JK
186void reset_ident_date(void)
187{
188 strbuf_reset(&git_default_date);
189}
190
6aa33f40
LT
191static int crud(unsigned char c)
192{
f64c81d4
AR
193 return c <= 32 ||
194 c == '.' ||
195 c == ',' ||
196 c == ':' ||
197 c == ';' ||
198 c == '<' ||
199 c == '>' ||
200 c == '"' ||
d404bf02 201 c == '\\' ||
f64c81d4 202 c == '\'';
6aa33f40
LT
203}
204
13b9a24e
JK
205static 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
6aa33f40
LT
214/*
215 * Copy over a string to the destination, but avoid special
216 * characters ('\n', '<' and '>') and remove crud at the end
217 */
c96f0c8d 218static void strbuf_addstr_without_crud(struct strbuf *sb, const char *src)
6aa33f40 219{
b0732115 220 size_t i, len;
6aa33f40
LT
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
82f9d58a 241 * characters '\n' '<' and '>' that act as delimiters on
c96f0c8d
JK
242 * an identification line. We can only remove crud, never add it,
243 * so 'len' is our maximum.
6aa33f40 244 */
c96f0c8d 245 strbuf_grow(sb, len);
6aa33f40
LT
246 for (i = 0; i < len; i++) {
247 c = *src++;
248 switch (c) {
249 case '\n': case '<': case '>':
250 continue;
251 }
c96f0c8d 252 sb->buf[sb->len++] = c;
6aa33f40 253 }
c96f0c8d 254 sb->buf[sb->len] = '\0';
6aa33f40
LT
255}
256
4b340cfa
JH
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 */
264int 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
d9955fd6 281 for (cp = split->mail_begin - 2; line <= cp; cp--)
4b340cfa
JH
282 if (!isspace(*cp)) {
283 split->name_end = cp + 1;
284 break;
285 }
e27ddb64
JH
286 if (!split->name_end) {
287 /* no human readable name */
288 split->name_end = split->name_begin;
289 }
4b340cfa
JH
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
03818a4a
JK
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++)
4b340cfa
JH
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
333person_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
749be728 341static const char *env_hint =
166e55e3
VA
342N_("\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");
749be728 353
774751a8
JH
354const char *fmt_ident(const char *name, const char *email,
355 const char *date_str, int flag)
6aa33f40 356{
c96f0c8d 357 static struct strbuf ident = STRBUF_INIT;
f9bc573f 358 int strict = (flag & IDENT_STRICT);
359b27ad 359 int want_date = !(flag & IDENT_NO_DATE);
c15e1987 360 int want_name = !(flag & IDENT_NO_NAME);
6aa33f40 361
862e80a4
JK
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
59f92959
JK
375 if (want_name) {
376 int using_default = 0;
377 if (!name) {
734c7789 378 if (strict && ident_use_config_only
d3c06c19 379 && !(ident_config_given & IDENT_NAME_GIVEN)) {
166e55e3 380 fputs(_(env_hint), stderr);
afb6c30b 381 die(_("no name was given and auto-detection is disabled"));
d3c06c19 382 }
59f92959
JK
383 name = ident_default_name();
384 using_default = 1;
385 if (strict && default_name_is_bogus) {
166e55e3 386 fputs(_(env_hint), stderr);
afb6c30b 387 die(_("unable to auto-detect name (got '%s')"), name);
59f92959
JK
388 }
389 }
390 if (!*name) {
391 struct passwd *pw;
392 if (strict) {
393 if (using_default)
166e55e3 394 fputs(_(env_hint), stderr);
afb6c30b 395 die(_("empty ident name (for <%s>) not allowed"), email);
59f92959
JK
396 }
397 pw = xgetpwuid_self(NULL);
398 name = pw->pw_name;
749be728 399 }
13b9a24e
JK
400 if (strict && !has_non_crud(name))
401 die(_("name consists only of disallowed characters: %s"), name);
92bcbb9b
JK
402 }
403
c96f0c8d 404 strbuf_reset(&ident);
c15e1987
JK
405 if (want_name) {
406 strbuf_addstr_without_crud(&ident, name);
407 strbuf_addstr(&ident, " <");
d9ccfe77 408 }
c96f0c8d 409 strbuf_addstr_without_crud(&ident, email);
c15e1987
JK
410 if (want_name)
411 strbuf_addch(&ident, '>');
359b27ad 412 if (want_date) {
c96f0c8d 413 strbuf_addch(&ident, ' ');
c33ddc2e
JK
414 if (date_str && date_str[0]) {
415 if (parse_date(date_str, &ident) < 0)
afb6c30b 416 die(_("invalid date format: %s"), date_str);
c33ddc2e
JK
417 }
418 else
419 strbuf_addstr(&ident, ident_default_date());
d9ccfe77 420 }
c33ddc2e 421
c96f0c8d 422 return ident.buf;
6aa33f40 423}
d289d136 424
d9ccfe77
JH
425const char *fmt_name(const char *name, const char *email)
426{
f9bc573f 427 return fmt_ident(name, email, NULL, IDENT_STRICT | IDENT_NO_DATE);
d9ccfe77
JH
428}
429
774751a8 430const char *git_author_info(int flag)
d289d136 431{
d6991cee
JK
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;
798123af 436 return fmt_ident(getenv("GIT_AUTHOR_NAME"),
c7d77dab 437 getenv("GIT_AUTHOR_EMAIL"),
749be728 438 getenv("GIT_AUTHOR_DATE"),
774751a8 439 flag);
d289d136
EB
440}
441
774751a8 442const char *git_committer_info(int flag)
d289d136 443{
91c38a21 444 if (getenv("GIT_COMMITTER_NAME"))
d6991cee 445 committer_ident_explicitly_given |= IDENT_NAME_GIVEN;
91c38a21 446 if (getenv("GIT_COMMITTER_EMAIL"))
d6991cee 447 committer_ident_explicitly_given |= IDENT_MAIL_GIVEN;
798123af 448 return fmt_ident(getenv("GIT_COMMITTER_NAME"),
c7d77dab 449 getenv("GIT_COMMITTER_EMAIL"),
749be728 450 getenv("GIT_COMMITTER_DATE"),
774751a8 451 flag);
d289d136 452}
5aeb3a3a 453
d6991cee 454static int ident_is_sufficient(int user_ident_explicitly_given)
5aeb3a3a
JH
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}
9597921b 462
d6991cee
JK
463int committer_ident_sufficiently_given(void)
464{
465 return ident_is_sufficient(committer_ident_explicitly_given);
466}
467
468int author_ident_sufficiently_given(void)
469{
470 return ident_is_sufficient(author_ident_explicitly_given);
471}
472
9597921b
JK
473int git_ident_config(const char *var, const char *value, void *data)
474{
4d5c2956
DA
475 if (!strcmp(var, "user.useconfigonly")) {
476 ident_use_config_only = git_config_bool(var, value);
477 return 0;
478 }
479
9597921b
JK
480 if (!strcmp(var, "user.name")) {
481 if (!value)
482 return config_error_nonbool(var);
8587ead7
JK
483 strbuf_reset(&git_default_name);
484 strbuf_addstr(&git_default_name, value);
d6991cee
JK
485 committer_ident_explicitly_given |= IDENT_NAME_GIVEN;
486 author_ident_explicitly_given |= IDENT_NAME_GIVEN;
4d5c2956 487 ident_config_given |= IDENT_NAME_GIVEN;
9597921b
JK
488 return 0;
489 }
490
491 if (!strcmp(var, "user.email")) {
492 if (!value)
493 return config_error_nonbool(var);
8587ead7
JK
494 strbuf_reset(&git_default_email);
495 strbuf_addstr(&git_default_email, value);
d6991cee
JK
496 committer_ident_explicitly_given |= IDENT_MAIL_GIVEN;
497 author_ident_explicitly_given |= IDENT_MAIL_GIVEN;
4d5c2956 498 ident_config_given |= IDENT_MAIL_GIVEN;
9597921b
JK
499 return 0;
500 }
501
502 return 0;
503}
662cc30c
JK
504
505static 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
520int 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}