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"
9static struct strbuf git_default_name = STRBUF_INIT;
11static struct strbuf git_default_email = STRBUF_INIT;
12static struct strbuf git_default_date = STRBUF_INIT;
13static int default_email_is_bogus;
14static int default_name_is_bogus;
15static int ident_use_config_only;
17#define IDENT_NAME_GIVEN 01
19#define IDENT_MAIL_GIVEN 02
20#define IDENT_ALL_GIVEN (IDENT_NAME_GIVEN|IDENT_MAIL_GIVEN)
21static int committer_ident_explicitly_given;
22static int author_ident_explicitly_given;
23static int ident_config_given;
24#ifdef NO_GECOS_IN_PWENT
26#define get_gecos(ignored) "&"
27#else
28#define get_gecos(struct_passwd) ((struct_passwd)->pw_gecos)
29#endif
30static struct passwd *xgetpwuid_self(int *is_bogus)
32{
33 struct passwd *pw;
34 errno = 0;
36 pw = getpwuid(getuid());
37 if (!pw) {
38 static struct passwd fallback;
39 fallback.pw_name = "unknown";
40#ifndef NO_GECOS_IN_PWENT
41 fallback.pw_gecos = "Unknown";
42#endif
43 pw = &fallback;
44 if (is_bogus)
45 *is_bogus = 1;
46 }
47 return pw;
48}
49static void copy_gecos(const struct passwd *w, struct strbuf *name)
51{
52 char *src;
53 /* Traditionally GECOS field had office phone numbers etc, separated
55 * with commas. Also & stands for capitalized form of the login name.
56 */
57 for (src = get_gecos(w); *src && *src != ','; src++) {
59 int ch = *src;
60 if (ch != '&')
61 strbuf_addch(name, ch);
62 else {
63 /* Sorry, Mr. McDonald... */
64 strbuf_addch(name, toupper(*w->pw_name));
65 strbuf_addstr(name, w->pw_name + 1);
66 }
67 }
68}
69static int add_mailname_host(struct strbuf *buf)
71{
72 FILE *mailname;
73 struct strbuf mailnamebuf = STRBUF_INIT;
74 mailname = fopen("/etc/mailname", "r");
76 if (!mailname) {
77 if (errno != ENOENT)
78 warning("cannot open /etc/mailname: %s",
79 strerror(errno));
80 return -1;
81 }
82 if (strbuf_getline(&mailnamebuf, mailname) == EOF) {
83 if (ferror(mailname))
84 warning("cannot read /etc/mailname: %s",
85 strerror(errno));
86 strbuf_release(&mailnamebuf);
87 fclose(mailname);
88 return -1;
89 }
90 /* success! */
91 strbuf_addbuf(buf, &mailnamebuf);
92 strbuf_release(&mailnamebuf);
93 fclose(mailname);
94 return 0;
95}
96static int canonical_name(const char *host, struct strbuf *out)
98{
99 int status = -1;
100#ifndef NO_IPV6
102 struct addrinfo hints, *ai;
103 memset (&hints, '\0', sizeof (hints));
104 hints.ai_flags = AI_CANONNAME;
105 if (!getaddrinfo(host, NULL, &hints, &ai)) {
106 if (ai && strchr(ai->ai_canonname, '.')) {
107 strbuf_addstr(out, ai->ai_canonname);
108 status = 0;
109 }
110 freeaddrinfo(ai);
111 }
112#else
113 struct hostent *he = gethostbyname(host);
114 if (he && strchr(he->h_name, '.')) {
115 strbuf_addstr(out, he->h_name);
116 status = 0;
117 }
118#endif /* NO_IPV6 */
119 return status;
121}
122static void add_domainname(struct strbuf *out, int *is_bogus)
124{
125 char buf[1024];
126 if (gethostname(buf, sizeof(buf))) {
128 warning("cannot get host name: %s", strerror(errno));
129 strbuf_addstr(out, "(none)");
130 *is_bogus = 1;
131 return;
132 }
133 if (strchr(buf, '.'))
134 strbuf_addstr(out, buf);
135 else if (canonical_name(buf, out) < 0) {
136 strbuf_addf(out, "%s.(none)", buf);
137 *is_bogus = 1;
138 }
139}
140static void copy_email(const struct passwd *pw, struct strbuf *email,
142 int *is_bogus)
143{
144 /*
145 * Make up a fake email address
146 * (name + '@' + hostname [+ '.' + domainname])
147 */
148 strbuf_addstr(email, pw->pw_name);
149 strbuf_addch(email, '@');
150 if (!add_mailname_host(email))
152 return; /* read from "/etc/mailname" (Debian) */
153 add_domainname(email, is_bogus);
154}
155const char *ident_default_name(void)
157{
158 if (!git_default_name.len) {
159 copy_gecos(xgetpwuid_self(&default_name_is_bogus), &git_default_name);
160 strbuf_trim(&git_default_name);
161 }
162 return git_default_name.buf;
163}
164const char *ident_default_email(void)
166{
167 if (!git_default_email.len) {
168 const char *email = getenv("EMAIL");
169 if (email && email[0]) {
171 strbuf_addstr(&git_default_email, email);
172 committer_ident_explicitly_given |= IDENT_MAIL_GIVEN;
173 author_ident_explicitly_given |= IDENT_MAIL_GIVEN;
174 } else
175 copy_email(xgetpwuid_self(&default_email_is_bogus),
176 &git_default_email, &default_email_is_bogus);
177 strbuf_trim(&git_default_email);
178 }
179 return git_default_email.buf;
180}
181static const char *ident_default_date(void)
183{
184 if (!git_default_date.len)
185 datestamp(&git_default_date);
186 return git_default_date.buf;
187}
188static int crud(unsigned char c)
190{
191 return c <= 32 ||
192 c == '.' ||
193 c == ',' ||
194 c == ':' ||
195 c == ';' ||
196 c == '<' ||
197 c == '>' ||
198 c == '"' ||
199 c == '\\' ||
200 c == '\'';
201}
202/*
204 * Copy over a string to the destination, but avoid special
205 * characters ('\n', '<' and '>') and remove crud at the end
206 */
207static void strbuf_addstr_without_crud(struct strbuf *sb, const char *src)
208{
209 size_t i, len;
210 unsigned char c;
211 /* Remove crud from the beginning.. */
213 while ((c = *src) != 0) {
214 if (!crud(c))
215 break;
216 src++;
217 }
218 /* Remove crud from the end.. */
220 len = strlen(src);
221 while (len > 0) {
222 c = src[len-1];
223 if (!crud(c))
224 break;
225 --len;
226 }
227 /*
229 * Copy the rest to the buffer, but avoid the special
230 * characters '\n' '<' and '>' that act as delimiters on
231 * an identification line. We can only remove crud, never add it,
232 * so 'len' is our maximum.
233 */
234 strbuf_grow(sb, len);
235 for (i = 0; i < len; i++) {
236 c = *src++;
237 switch (c) {
238 case '\n': case '<': case '>':
239 continue;
240 }
241 sb->buf[sb->len++] = c;
242 }
243 sb->buf[sb->len] = '\0';
244}
245/*
247 * Reverse of fmt_ident(); given an ident line, split the fields
248 * to allow the caller to parse it.
249 * Signal a success by returning 0, but date/tz fields of the result
250 * can still be NULL if the input line only has the name/email part
251 * (e.g. reading from a reflog entry).
252 */
253int split_ident_line(struct ident_split *split, const char *line, int len)
254{
255 const char *cp;
256 size_t span;
257 int status = -1;
258 memset(split, 0, sizeof(*split));
260 split->name_begin = line;
262 for (cp = line; *cp && cp < line + len; cp++)
263 if (*cp == '<') {
264 split->mail_begin = cp + 1;
265 break;
266 }
267 if (!split->mail_begin)
268 return status;
269 for (cp = split->mail_begin - 2; line <= cp; cp--)
271 if (!isspace(*cp)) {
272 split->name_end = cp + 1;
273 break;
274 }
275 if (!split->name_end) {
276 /* no human readable name */
277 split->name_end = split->name_begin;
278 }
279 for (cp = split->mail_begin; cp < line + len; cp++)
281 if (*cp == '>') {
282 split->mail_end = cp;
283 break;
284 }
285 if (!split->mail_end)
286 return status;
287 /*
289 * Look from the end-of-line to find the trailing ">" of the mail
290 * address, even though we should already know it as split->mail_end.
291 * This can help in cases of broken idents with an extra ">" somewhere
292 * in the email address. Note that we are assuming the timestamp will
293 * never have a ">" in it.
294 *
295 * Note that we will always find some ">" before going off the front of
296 * the string, because will always hit the split->mail_end closing
297 * bracket.
298 */
299 for (cp = line + len - 1; *cp != '>'; cp--)
300 ;
301 for (cp = cp + 1; cp < line + len && isspace(*cp); cp++)
303 ;
304 if (line + len <= cp)
305 goto person_only;
306 split->date_begin = cp;
307 span = strspn(cp, "0123456789");
308 if (!span)
309 goto person_only;
310 split->date_end = split->date_begin + span;
311 for (cp = split->date_end; cp < line + len && isspace(*cp); cp++)
312 ;
313 if (line + len <= cp || (*cp != '+' && *cp != '-'))
314 goto person_only;
315 split->tz_begin = cp;
316 span = strspn(cp + 1, "0123456789");
317 if (!span)
318 goto person_only;
319 split->tz_end = split->tz_begin + 1 + span;
320 return 0;
321person_only:
323 split->date_begin = NULL;
324 split->date_end = NULL;
325 split->tz_begin = NULL;
326 split->tz_end = NULL;
327 return 0;
328}
329static const char *env_hint =
331"\n"
332"*** Please tell me who you are.\n"
333"\n"
334"Run\n"
335"\n"
336" git config --global user.email \"you@example.com\"\n"
337" git config --global user.name \"Your Name\"\n"
338"\n"
339"to set your account\'s default identity.\n"
340"Omit --global to set the identity only in this repository.\n"
341"\n";
342const char *fmt_ident(const char *name, const char *email,
344 const char *date_str, int flag)
345{
346 static struct strbuf ident = STRBUF_INIT;
347 int strict = (flag & IDENT_STRICT);
348 int want_date = !(flag & IDENT_NO_DATE);
349 int want_name = !(flag & IDENT_NO_NAME);
350 if (want_name) {
352 int using_default = 0;
353 if (!name) {
354 name = ident_default_name();
355 using_default = 1;
356 if (strict && default_name_is_bogus) {
357 fputs(env_hint, stderr);
358 die("unable to auto-detect name (got '%s')", name);
359 }
360 if (strict && ident_use_config_only
361 && !(ident_config_given & IDENT_NAME_GIVEN))
362 die("user.useConfigOnly set but no name given");
363 }
364 if (!*name) {
365 struct passwd *pw;
366 if (strict) {
367 if (using_default)
368 fputs(env_hint, stderr);
369 die("empty ident name (for <%s>) not allowed", email);
370 }
371 pw = xgetpwuid_self(NULL);
372 name = pw->pw_name;
373 }
374 }
375 if (!email) {
377 email = ident_default_email();
378 if (strict && default_email_is_bogus) {
379 fputs(env_hint, stderr);
380 die("unable to auto-detect email address (got '%s')", email);
381 }
382 if (strict && ident_use_config_only
383 && !(ident_config_given & IDENT_MAIL_GIVEN))
384 die("user.useConfigOnly set but no mail given");
385 }
386 strbuf_reset(&ident);
388 if (want_name) {
389 strbuf_addstr_without_crud(&ident, name);
390 strbuf_addstr(&ident, " <");
391 }
392 strbuf_addstr_without_crud(&ident, email);
393 if (want_name)
394 strbuf_addch(&ident, '>');
395 if (want_date) {
396 strbuf_addch(&ident, ' ');
397 if (date_str && date_str[0]) {
398 if (parse_date(date_str, &ident) < 0)
399 die("invalid date format: %s", date_str);
400 }
401 else
402 strbuf_addstr(&ident, ident_default_date());
403 }
404 return ident.buf;
406}
407const char *fmt_name(const char *name, const char *email)
409{
410 return fmt_ident(name, email, NULL, IDENT_STRICT | IDENT_NO_DATE);
411}
412const char *git_author_info(int flag)
414{
415 if (getenv("GIT_AUTHOR_NAME"))
416 author_ident_explicitly_given |= IDENT_NAME_GIVEN;
417 if (getenv("GIT_AUTHOR_EMAIL"))
418 author_ident_explicitly_given |= IDENT_MAIL_GIVEN;
419 return fmt_ident(getenv("GIT_AUTHOR_NAME"),
420 getenv("GIT_AUTHOR_EMAIL"),
421 getenv("GIT_AUTHOR_DATE"),
422 flag);
423}
424const char *git_committer_info(int flag)
426{
427 if (getenv("GIT_COMMITTER_NAME"))
428 committer_ident_explicitly_given |= IDENT_NAME_GIVEN;
429 if (getenv("GIT_COMMITTER_EMAIL"))
430 committer_ident_explicitly_given |= IDENT_MAIL_GIVEN;
431 return fmt_ident(getenv("GIT_COMMITTER_NAME"),
432 getenv("GIT_COMMITTER_EMAIL"),
433 getenv("GIT_COMMITTER_DATE"),
434 flag);
435}
436static int ident_is_sufficient(int user_ident_explicitly_given)
438{
439#ifndef WINDOWS
440 return (user_ident_explicitly_given & IDENT_MAIL_GIVEN);
441#else
442 return (user_ident_explicitly_given == IDENT_ALL_GIVEN);
443#endif
444}
445int committer_ident_sufficiently_given(void)
447{
448 return ident_is_sufficient(committer_ident_explicitly_given);
449}
450int author_ident_sufficiently_given(void)
452{
453 return ident_is_sufficient(author_ident_explicitly_given);
454}
455int git_ident_config(const char *var, const char *value, void *data)
457{
458 if (!strcmp(var, "user.useconfigonly")) {
459 ident_use_config_only = git_config_bool(var, value);
460 return 0;
461 }
462 if (!strcmp(var, "user.name")) {
464 if (!value)
465 return config_error_nonbool(var);
466 strbuf_reset(&git_default_name);
467 strbuf_addstr(&git_default_name, value);
468 committer_ident_explicitly_given |= IDENT_NAME_GIVEN;
469 author_ident_explicitly_given |= IDENT_NAME_GIVEN;
470 ident_config_given |= IDENT_NAME_GIVEN;
471 return 0;
472 }
473 if (!strcmp(var, "user.email")) {
475 if (!value)
476 return config_error_nonbool(var);
477 strbuf_reset(&git_default_email);
478 strbuf_addstr(&git_default_email, value);
479 committer_ident_explicitly_given |= IDENT_MAIL_GIVEN;
480 author_ident_explicitly_given |= IDENT_MAIL_GIVEN;
481 ident_config_given |= IDENT_MAIL_GIVEN;
482 return 0;
483 }
484 return 0;
486}
487static int buf_cmp(const char *a_begin, const char *a_end,
489 const char *b_begin, const char *b_end)
490{
491 int a_len = a_end - a_begin;
492 int b_len = b_end - b_begin;
493 int min = a_len < b_len ? a_len : b_len;
494 int cmp;
495 cmp = memcmp(a_begin, b_begin, min);
497 if (cmp)
498 return cmp;
499 return a_len - b_len;
501}
502int ident_cmp(const struct ident_split *a,
504 const struct ident_split *b)
505{
506 int cmp;
507 cmp = buf_cmp(a->mail_begin, a->mail_end,
509 b->mail_begin, b->mail_end);
510 if (cmp)
511 return cmp;
512 return buf_cmp(a->name_begin, a->name_end,
514 b->name_begin, b->name_end);
515}