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 #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 }