ident.c

   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
  10 static struct strbuf git_default_name = STRBUF_INIT;
  11 static struct strbuf git_default_email = STRBUF_INIT;
  12 static struct strbuf git_default_date = STRBUF_INIT;
  13 static int default_email_is_bogus;
  14 static int default_name_is_bogus;
  15
  16 static int ident_use_config_only;
  17
  18 #define IDENT_NAME_GIVEN 01
  19 #define IDENT_MAIL_GIVEN 02
  20 #define IDENT_ALL_GIVEN (IDENT_NAME_GIVEN|IDENT_MAIL_GIVEN)
  21 static int committer_ident_explicitly_given;
  22 static int author_ident_explicitly_given;
  23 static int ident_config_given;
  24
  25 #ifdef NO_GECOS_IN_PWENT
  26 #define get_gecos(ignored) "&"
  27 #else
  28 #define get_gecos(struct_passwd) ((struct_passwd)->pw_gecos)
  29 #endif
  30
  31 static struct passwd *xgetpwuid_self(int *is_bogus)
  32 {
  33         struct passwd *pw;
  34
  35         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 }
  49
  50 static void copy_gecos(const struct passwd *w, struct strbuf *name)
  51 {
  52         char *src;
  53
  54         /* Traditionally GECOS field had office phone numbers etc, separated
  55          * with commas.  Also & stands for capitalized form of the login name.
  56          */
  57
  58         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 }
  69
  70 static int add_mailname_host(struct strbuf *buf)
  71 {
  72         FILE *mailname;
  73         struct strbuf mailnamebuf = STRBUF_INIT;
  74
  75         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 }
  96
  97 static int canonical_name(const char *host, struct strbuf *out)
  98 {
  99         int status = -1;
 100
 101 #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
 120         return status;
 121 }
 122
 123 static void add_domainname(struct strbuf *out, int *is_bogus)
 124 {
 125         char buf[1024];
 126
 127         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 }
 140
 141 static 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
 151         if (!add_mailname_host(email))
 152                 return; /* read from "/etc/mailname" (Debian) */
 153         add_domainname(email, is_bogus);
 154 }
 155
 156 const 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 }
 164
 165 const char *ident_default_email(void)
 166 {
 167         if (!git_default_email.len) {
 168                 const char *email = getenv("EMAIL");
 169
 170                 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 }
 181
 182 static 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 }
 188
 189 static 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
 203 /*
 204  * Copy over a string to the destination, but avoid special
 205  * characters ('\n', '<' and '>') and remove crud at the end
 206  */
 207 static void strbuf_addstr_without_crud(struct strbuf *sb, const char *src)
 208 {
 209         size_t i, len;
 210         unsigned char c;
 211
 212         /* Remove crud from the beginning.. */
 213         while ((c = *src) != 0) {
 214                 if (!crud(c))
 215                         break;
 216                 src++;
 217         }
 218
 219         /* 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
 228         /*
 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
 246 /*
 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  */
 253 int 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
 259         memset(split, 0, sizeof(*split));
 260
 261         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
 270         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
 280         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
 288         /*
 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
 302         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;
 321
 322 person_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 }
 329
 330 static 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";
 342
 343 const 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
 351         if (want_name) {
 352                 int using_default = 0;
 353                 if (!name) {
 354                         if (strict && ident_use_config_only
 355                             && !(ident_config_given & IDENT_NAME_GIVEN)) {
 356                                 fputs(env_hint, stderr);
 357                                 die("no name was given and auto-detection is disabled");
 358                         }
 359                         name = ident_default_name();
 360                         using_default = 1;
 361                         if (strict && default_name_is_bogus) {
 362                                 fputs(env_hint, stderr);
 363                                 die("unable to auto-detect name (got '%s')", name);
 364                         }
 365                 }
 366                 if (!*name) {
 367                         struct passwd *pw;
 368                         if (strict) {
 369                                 if (using_default)
 370                                         fputs(env_hint, stderr);
 371                                 die("empty ident name (for <%s>) not allowed", email);
 372                         }
 373                         pw = xgetpwuid_self(NULL);
 374                         name = pw->pw_name;
 375                 }
 376         }
 377
 378         if (!email) {
 379                 if (strict && ident_use_config_only
 380                     && !(ident_config_given & IDENT_MAIL_GIVEN)) {
 381                         fputs(env_hint, stderr);
 382                         die("no email was given and auto-detection is disabled");
 383                 }
 384                 email = ident_default_email();
 385                 if (strict && default_email_is_bogus) {
 386                         fputs(env_hint, stderr);
 387                         die("unable to auto-detect email address (got '%s')", email);
 388                 }
 389         }
 390
 391         strbuf_reset(&ident);
 392         if (want_name) {
 393                 strbuf_addstr_without_crud(&ident, name);
 394                 strbuf_addstr(&ident, " <");
 395         }
 396         strbuf_addstr_without_crud(&ident, email);
 397         if (want_name)
 398                         strbuf_addch(&ident, '>');
 399         if (want_date) {
 400                 strbuf_addch(&ident, ' ');
 401                 if (date_str && date_str[0]) {
 402                         if (parse_date(date_str, &ident) < 0)
 403                                 die("invalid date format: %s", date_str);
 404                 }
 405                 else
 406                         strbuf_addstr(&ident, ident_default_date());
 407         }
 408
 409         return ident.buf;
 410 }
 411
 412 const char *fmt_name(const char *name, const char *email)
 413 {
 414         return fmt_ident(name, email, NULL, IDENT_STRICT | IDENT_NO_DATE);
 415 }
 416
 417 const char *git_author_info(int flag)
 418 {
 419         if (getenv("GIT_AUTHOR_NAME"))
 420                 author_ident_explicitly_given |= IDENT_NAME_GIVEN;
 421         if (getenv("GIT_AUTHOR_EMAIL"))
 422                 author_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 423         return fmt_ident(getenv("GIT_AUTHOR_NAME"),
 424                          getenv("GIT_AUTHOR_EMAIL"),
 425                          getenv("GIT_AUTHOR_DATE"),
 426                          flag);
 427 }
 428
 429 const char *git_committer_info(int flag)
 430 {
 431         if (getenv("GIT_COMMITTER_NAME"))
 432                 committer_ident_explicitly_given |= IDENT_NAME_GIVEN;
 433         if (getenv("GIT_COMMITTER_EMAIL"))
 434                 committer_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 435         return fmt_ident(getenv("GIT_COMMITTER_NAME"),
 436                          getenv("GIT_COMMITTER_EMAIL"),
 437                          getenv("GIT_COMMITTER_DATE"),
 438                          flag);
 439 }
 440
 441 static int ident_is_sufficient(int user_ident_explicitly_given)
 442 {
 443 #ifndef WINDOWS
 444         return (user_ident_explicitly_given & IDENT_MAIL_GIVEN);
 445 #else
 446         return (user_ident_explicitly_given == IDENT_ALL_GIVEN);
 447 #endif
 448 }
 449
 450 int committer_ident_sufficiently_given(void)
 451 {
 452         return ident_is_sufficient(committer_ident_explicitly_given);
 453 }
 454
 455 int author_ident_sufficiently_given(void)
 456 {
 457         return ident_is_sufficient(author_ident_explicitly_given);
 458 }
 459
 460 int git_ident_config(const char *var, const char *value, void *data)
 461 {
 462         if (!strcmp(var, "user.useconfigonly")) {
 463                 ident_use_config_only = git_config_bool(var, value);
 464                 return 0;
 465         }
 466
 467         if (!strcmp(var, "user.name")) {
 468                 if (!value)
 469                         return config_error_nonbool(var);
 470                 strbuf_reset(&git_default_name);
 471                 strbuf_addstr(&git_default_name, value);
 472                 committer_ident_explicitly_given |= IDENT_NAME_GIVEN;
 473                 author_ident_explicitly_given |= IDENT_NAME_GIVEN;
 474                 ident_config_given |= IDENT_NAME_GIVEN;
 475                 return 0;
 476         }
 477
 478         if (!strcmp(var, "user.email")) {
 479                 if (!value)
 480                         return config_error_nonbool(var);
 481                 strbuf_reset(&git_default_email);
 482                 strbuf_addstr(&git_default_email, value);
 483                 committer_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 484                 author_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 485                 ident_config_given |= IDENT_MAIL_GIVEN;
 486                 return 0;
 487         }
 488
 489         return 0;
 490 }
 491
 492 static int buf_cmp(const char *a_begin, const char *a_end,
 493                    const char *b_begin, const char *b_end)
 494 {
 495         int a_len = a_end - a_begin;
 496         int b_len = b_end - b_begin;
 497         int min = a_len < b_len ? a_len : b_len;
 498         int cmp;
 499
 500         cmp = memcmp(a_begin, b_begin, min);
 501         if (cmp)
 502                 return cmp;
 503
 504         return a_len - b_len;
 505 }
 506
 507 int ident_cmp(const struct ident_split *a,
 508               const struct ident_split *b)
 509 {
 510         int cmp;
 511
 512         cmp = buf_cmp(a->mail_begin, a->mail_end,
 513                       b->mail_begin, b->mail_end);
 514         if (cmp)
 515                 return cmp;
 516
 517         return buf_cmp(a->name_begin, a->name_end,
 518                        b->name_begin, b->name_end);
 519 }