Andrew's git / gitweb.git / ident.c
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ident.con commit Merge branch 'jh/resize-convert-scratch-buffer' (1828e52)
   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
  11static struct strbuf git_default_name = STRBUF_INIT;
  12static struct strbuf git_default_email = STRBUF_INIT;
  13static struct strbuf git_default_date = STRBUF_INIT;
  14static struct strbuf git_author_name = STRBUF_INIT;
  15static struct strbuf git_author_email = STRBUF_INIT;
  16static struct strbuf git_committer_name = STRBUF_INIT;
  17static struct strbuf git_committer_email = STRBUF_INIT;
  18static int default_email_is_bogus;
  19static int default_name_is_bogus;
  20
  21static int ident_use_config_only;
  22
  23#define IDENT_NAME_GIVEN 01
  24#define IDENT_MAIL_GIVEN 02
  25#define IDENT_ALL_GIVEN (IDENT_NAME_GIVEN|IDENT_MAIL_GIVEN)
  26static int committer_ident_explicitly_given;
  27static int author_ident_explicitly_given;
  28static int ident_config_given;
  29
  30#ifdef NO_GECOS_IN_PWENT
  31#define get_gecos(ignored) "&"
  32#else
  33#define get_gecos(struct_passwd) ((struct_passwd)->pw_gecos)
  34#endif
  35
  36static struct passwd *xgetpwuid_self(int *is_bogus)
  37{
  38        struct passwd *pw;
  39
  40        errno = 0;
  41        pw = getpwuid(getuid());
  42        if (!pw) {
  43                static struct passwd fallback;
  44                fallback.pw_name = "unknown";
  45#ifndef NO_GECOS_IN_PWENT
  46                fallback.pw_gecos = "Unknown";
  47#endif
  48                pw = &fallback;
  49                if (is_bogus)
  50                        *is_bogus = 1;
  51        }
  52        return pw;
  53}
  54
  55static void copy_gecos(const struct passwd *w, struct strbuf *name)
  56{
  57        char *src;
  58
  59        /* Traditionally GECOS field had office phone numbers etc, separated
  60         * with commas.  Also & stands for capitalized form of the login name.
  61         */
  62
  63        for (src = get_gecos(w); *src && *src != ','; src++) {
  64                int ch = *src;
  65                if (ch != '&')
  66                        strbuf_addch(name, ch);
  67                else {
  68                        /* Sorry, Mr. McDonald... */
  69                        strbuf_addch(name, toupper(*w->pw_name));
  70                        strbuf_addstr(name, w->pw_name + 1);
  71                }
  72        }
  73}
  74
  75static int add_mailname_host(struct strbuf *buf)
  76{
  77        FILE *mailname;
  78        struct strbuf mailnamebuf = STRBUF_INIT;
  79
  80        mailname = fopen_or_warn("/etc/mailname", "r");
  81        if (!mailname)
  82                return -1;
  83
  84        if (strbuf_getline(&mailnamebuf, mailname) == EOF) {
  85                if (ferror(mailname))
  86                        warning_errno("cannot read /etc/mailname");
  87                strbuf_release(&mailnamebuf);
  88                fclose(mailname);
  89                return -1;
  90        }
  91        /* success! */
  92        strbuf_addbuf(buf, &mailnamebuf);
  93        strbuf_release(&mailnamebuf);
  94        fclose(mailname);
  95        return 0;
  96}
  97
  98static int canonical_name(const char *host, struct strbuf *out)
  99{
 100        int status = -1;
 101
 102#ifndef NO_IPV6
 103        struct addrinfo hints, *ai;
 104        memset (&hints, '\0', sizeof (hints));
 105        hints.ai_flags = AI_CANONNAME;
 106        if (!getaddrinfo(host, NULL, &hints, &ai)) {
 107                if (ai && ai->ai_canonname && strchr(ai->ai_canonname, '.')) {
 108                        strbuf_addstr(out, ai->ai_canonname);
 109                        status = 0;
 110                }
 111                freeaddrinfo(ai);
 112        }
 113#else
 114        struct hostent *he = gethostbyname(host);
 115        if (he && strchr(he->h_name, '.')) {
 116                strbuf_addstr(out, he->h_name);
 117                status = 0;
 118        }
 119#endif /* NO_IPV6 */
 120
 121        return status;
 122}
 123
 124static void add_domainname(struct strbuf *out, int *is_bogus)
 125{
 126        char buf[HOST_NAME_MAX + 1];
 127
 128        if (xgethostname(buf, sizeof(buf))) {
 129                warning_errno("cannot get host name");
 130                strbuf_addstr(out, "(none)");
 131                *is_bogus = 1;
 132                return;
 133        }
 134        if (strchr(buf, '.'))
 135                strbuf_addstr(out, buf);
 136        else if (canonical_name(buf, out) < 0) {
 137                strbuf_addf(out, "%s.(none)", buf);
 138                *is_bogus = 1;
 139        }
 140}
 141
 142static void copy_email(const struct passwd *pw, struct strbuf *email,
 143                       int *is_bogus)
 144{
 145        /*
 146         * Make up a fake email address
 147         * (name + '@' + hostname [+ '.' + domainname])
 148         */
 149        strbuf_addstr(email, pw->pw_name);
 150        strbuf_addch(email, '@');
 151
 152        if (!add_mailname_host(email))
 153                return; /* read from "/etc/mailname" (Debian) */
 154        add_domainname(email, is_bogus);
 155}
 156
 157const char *ident_default_name(void)
 158{
 159        if (!(ident_config_given & IDENT_NAME_GIVEN) && !git_default_name.len) {
 160                copy_gecos(xgetpwuid_self(&default_name_is_bogus), &git_default_name);
 161                strbuf_trim(&git_default_name);
 162        }
 163        return git_default_name.buf;
 164}
 165
 166const char *ident_default_email(void)
 167{
 168        if (!(ident_config_given & IDENT_MAIL_GIVEN) && !git_default_email.len) {
 169                const char *email = getenv("EMAIL");
 170
 171                if (email && email[0]) {
 172                        strbuf_addstr(&git_default_email, email);
 173                        committer_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 174                        author_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 175                } else if ((email = query_user_email()) && email[0]) {
 176                        strbuf_addstr(&git_default_email, email);
 177                        free((char *)email);
 178                } else
 179                        copy_email(xgetpwuid_self(&default_email_is_bogus),
 180                                   &git_default_email, &default_email_is_bogus);
 181                strbuf_trim(&git_default_email);
 182        }
 183        return git_default_email.buf;
 184}
 185
 186static const char *ident_default_date(void)
 187{
 188        if (!git_default_date.len)
 189                datestamp(&git_default_date);
 190        return git_default_date.buf;
 191}
 192
 193void reset_ident_date(void)
 194{
 195        strbuf_reset(&git_default_date);
 196}
 197
 198static int crud(unsigned char c)
 199{
 200        return  c <= 32  ||
 201                c == '.' ||
 202                c == ',' ||
 203                c == ':' ||
 204                c == ';' ||
 205                c == '<' ||
 206                c == '>' ||
 207                c == '"' ||
 208                c == '\\' ||
 209                c == '\'';
 210}
 211
 212static int has_non_crud(const char *str)
 213{
 214        for (; *str; str++) {
 215                if (!crud(*str))
 216                        return 1;
 217        }
 218        return 0;
 219}
 220
 221/*
 222 * Copy over a string to the destination, but avoid special
 223 * characters ('\n', '<' and '>') and remove crud at the end
 224 */
 225static void strbuf_addstr_without_crud(struct strbuf *sb, const char *src)
 226{
 227        size_t i, len;
 228        unsigned char c;
 229
 230        /* Remove crud from the beginning.. */
 231        while ((c = *src) != 0) {
 232                if (!crud(c))
 233                        break;
 234                src++;
 235        }
 236
 237        /* Remove crud from the end.. */
 238        len = strlen(src);
 239        while (len > 0) {
 240                c = src[len-1];
 241                if (!crud(c))
 242                        break;
 243                --len;
 244        }
 245
 246        /*
 247         * Copy the rest to the buffer, but avoid the special
 248         * characters '\n' '<' and '>' that act as delimiters on
 249         * an identification line. We can only remove crud, never add it,
 250         * so 'len' is our maximum.
 251         */
 252        strbuf_grow(sb, len);
 253        for (i = 0; i < len; i++) {
 254                c = *src++;
 255                switch (c) {
 256                case '\n': case '<': case '>':
 257                        continue;
 258                }
 259                sb->buf[sb->len++] = c;
 260        }
 261        sb->buf[sb->len] = '\0';
 262}
 263
 264/*
 265 * Reverse of fmt_ident(); given an ident line, split the fields
 266 * to allow the caller to parse it.
 267 * Signal a success by returning 0, but date/tz fields of the result
 268 * can still be NULL if the input line only has the name/email part
 269 * (e.g. reading from a reflog entry).
 270 */
 271int split_ident_line(struct ident_split *split, const char *line, int len)
 272{
 273        const char *cp;
 274        size_t span;
 275        int status = -1;
 276
 277        memset(split, 0, sizeof(*split));
 278
 279        split->name_begin = line;
 280        for (cp = line; *cp && cp < line + len; cp++)
 281                if (*cp == '<') {
 282                        split->mail_begin = cp + 1;
 283                        break;
 284                }
 285        if (!split->mail_begin)
 286                return status;
 287
 288        for (cp = split->mail_begin - 2; line <= cp; cp--)
 289                if (!isspace(*cp)) {
 290                        split->name_end = cp + 1;
 291                        break;
 292                }
 293        if (!split->name_end) {
 294                /* no human readable name */
 295                split->name_end = split->name_begin;
 296        }
 297
 298        for (cp = split->mail_begin; cp < line + len; cp++)
 299                if (*cp == '>') {
 300                        split->mail_end = cp;
 301                        break;
 302                }
 303        if (!split->mail_end)
 304                return status;
 305
 306        /*
 307         * Look from the end-of-line to find the trailing ">" of the mail
 308         * address, even though we should already know it as split->mail_end.
 309         * This can help in cases of broken idents with an extra ">" somewhere
 310         * in the email address.  Note that we are assuming the timestamp will
 311         * never have a ">" in it.
 312         *
 313         * Note that we will always find some ">" before going off the front of
 314         * the string, because will always hit the split->mail_end closing
 315         * bracket.
 316         */
 317        for (cp = line + len - 1; *cp != '>'; cp--)
 318                ;
 319
 320        for (cp = cp + 1; cp < line + len && isspace(*cp); cp++)
 321                ;
 322        if (line + len <= cp)
 323                goto person_only;
 324        split->date_begin = cp;
 325        span = strspn(cp, "0123456789");
 326        if (!span)
 327                goto person_only;
 328        split->date_end = split->date_begin + span;
 329        for (cp = split->date_end; cp < line + len && isspace(*cp); cp++)
 330                ;
 331        if (line + len <= cp || (*cp != '+' && *cp != '-'))
 332                goto person_only;
 333        split->tz_begin = cp;
 334        span = strspn(cp + 1, "0123456789");
 335        if (!span)
 336                goto person_only;
 337        split->tz_end = split->tz_begin + 1 + span;
 338        return 0;
 339
 340person_only:
 341        split->date_begin = NULL;
 342        split->date_end = NULL;
 343        split->tz_begin = NULL;
 344        split->tz_end = NULL;
 345        return 0;
 346}
 347
 348static const char *env_hint =
 349N_("\n"
 350   "*** Please tell me who you are.\n"
 351   "\n"
 352   "Run\n"
 353   "\n"
 354   "  git config --global user.email \"you@example.com\"\n"
 355   "  git config --global user.name \"Your Name\"\n"
 356   "\n"
 357   "to set your account\'s default identity.\n"
 358   "Omit --global to set the identity only in this repository.\n"
 359   "\n");
 360
 361const char *fmt_ident(const char *name, const char *email,
 362                      enum want_ident whose_ident, const char *date_str, int flag)
 363{
 364        static struct strbuf ident = STRBUF_INIT;
 365        int strict = (flag & IDENT_STRICT);
 366        int want_date = !(flag & IDENT_NO_DATE);
 367        int want_name = !(flag & IDENT_NO_NAME);
 368
 369        if (!email) {
 370                if (whose_ident == WANT_AUTHOR_IDENT && git_author_email.len)
 371                        email = git_author_email.buf;
 372                else if (whose_ident == WANT_COMMITTER_IDENT && git_committer_email.len)
 373                        email = git_committer_email.buf;
 374        }
 375        if (!email) {
 376                if (strict && ident_use_config_only
 377                    && !(ident_config_given & IDENT_MAIL_GIVEN)) {
 378                        fputs(_(env_hint), stderr);
 379                        die(_("no email was given and auto-detection is disabled"));
 380                }
 381                email = ident_default_email();
 382                if (strict && default_email_is_bogus) {
 383                        fputs(_(env_hint), stderr);
 384                        die(_("unable to auto-detect email address (got '%s')"), email);
 385                }
 386        }
 387
 388        if (want_name) {
 389                int using_default = 0;
 390                if (!name) {
 391                        if (whose_ident == WANT_AUTHOR_IDENT && git_author_name.len)
 392                                name = git_author_name.buf;
 393                        else if (whose_ident == WANT_COMMITTER_IDENT &&
 394                                        git_committer_name.len)
 395                                name = git_committer_name.buf;
 396                }
 397                if (!name) {
 398                        if (strict && ident_use_config_only
 399                            && !(ident_config_given & IDENT_NAME_GIVEN)) {
 400                                fputs(_(env_hint), stderr);
 401                                die(_("no name was given and auto-detection is disabled"));
 402                        }
 403                        name = ident_default_name();
 404                        using_default = 1;
 405                        if (strict && default_name_is_bogus) {
 406                                fputs(_(env_hint), stderr);
 407                                die(_("unable to auto-detect name (got '%s')"), name);
 408                        }
 409                }
 410                if (!*name) {
 411                        struct passwd *pw;
 412                        if (strict) {
 413                                if (using_default)
 414                                        fputs(_(env_hint), stderr);
 415                                die(_("empty ident name (for <%s>) not allowed"), email);
 416                        }
 417                        pw = xgetpwuid_self(NULL);
 418                        name = pw->pw_name;
 419                }
 420                if (strict && !has_non_crud(name))
 421                        die(_("name consists only of disallowed characters: %s"), name);
 422        }
 423
 424        strbuf_reset(&ident);
 425        if (want_name) {
 426                strbuf_addstr_without_crud(&ident, name);
 427                strbuf_addstr(&ident, " <");
 428        }
 429        strbuf_addstr_without_crud(&ident, email);
 430        if (want_name)
 431                        strbuf_addch(&ident, '>');
 432        if (want_date) {
 433                strbuf_addch(&ident, ' ');
 434                if (date_str && date_str[0]) {
 435                        if (parse_date(date_str, &ident) < 0)
 436                                die(_("invalid date format: %s"), date_str);
 437                }
 438                else
 439                        strbuf_addstr(&ident, ident_default_date());
 440        }
 441
 442        return ident.buf;
 443}
 444
 445const char *fmt_name(enum want_ident whose_ident)
 446{
 447        char *name = NULL;
 448        char *email = NULL;
 449
 450        switch (whose_ident) {
 451        case WANT_BLANK_IDENT:
 452                break;
 453        case WANT_AUTHOR_IDENT:
 454                name = getenv("GIT_AUTHOR_NAME");
 455                email = getenv("GIT_AUTHOR_EMAIL");
 456                break;
 457        case WANT_COMMITTER_IDENT:
 458                name = getenv("GIT_COMMITTER_NAME");
 459                email = getenv("GIT_COMMITTER_EMAIL");
 460                break;
 461        }
 462        return fmt_ident(name, email, whose_ident, NULL,
 463                        IDENT_STRICT | IDENT_NO_DATE);
 464}
 465
 466const char *git_author_info(int flag)
 467{
 468        if (getenv("GIT_AUTHOR_NAME"))
 469                author_ident_explicitly_given |= IDENT_NAME_GIVEN;
 470        if (getenv("GIT_AUTHOR_EMAIL"))
 471                author_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 472        return fmt_ident(getenv("GIT_AUTHOR_NAME"),
 473                         getenv("GIT_AUTHOR_EMAIL"),
 474                         WANT_AUTHOR_IDENT,
 475                         getenv("GIT_AUTHOR_DATE"),
 476                         flag);
 477}
 478
 479const char *git_committer_info(int flag)
 480{
 481        if (getenv("GIT_COMMITTER_NAME"))
 482                committer_ident_explicitly_given |= IDENT_NAME_GIVEN;
 483        if (getenv("GIT_COMMITTER_EMAIL"))
 484                committer_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 485        return fmt_ident(getenv("GIT_COMMITTER_NAME"),
 486                         getenv("GIT_COMMITTER_EMAIL"),
 487                         WANT_COMMITTER_IDENT,
 488                         getenv("GIT_COMMITTER_DATE"),
 489                         flag);
 490}
 491
 492static int ident_is_sufficient(int user_ident_explicitly_given)
 493{
 494#ifndef WINDOWS
 495        return (user_ident_explicitly_given & IDENT_MAIL_GIVEN);
 496#else
 497        return (user_ident_explicitly_given == IDENT_ALL_GIVEN);
 498#endif
 499}
 500
 501int committer_ident_sufficiently_given(void)
 502{
 503        return ident_is_sufficient(committer_ident_explicitly_given);
 504}
 505
 506int author_ident_sufficiently_given(void)
 507{
 508        return ident_is_sufficient(author_ident_explicitly_given);
 509}
 510
 511static int set_ident(const char *var, const char *value)
 512{
 513        if (!strcmp(var, "author.name")) {
 514                if (!value)
 515                        return config_error_nonbool(var);
 516                strbuf_reset(&git_author_name);
 517                strbuf_addstr(&git_author_name, value);
 518                author_ident_explicitly_given |= IDENT_NAME_GIVEN;
 519                ident_config_given |= IDENT_NAME_GIVEN;
 520                return 0;
 521        }
 522
 523        if (!strcmp(var, "author.email")) {
 524                if (!value)
 525                        return config_error_nonbool(var);
 526                strbuf_reset(&git_author_email);
 527                strbuf_addstr(&git_author_email, value);
 528                author_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 529                ident_config_given |= IDENT_MAIL_GIVEN;
 530                return 0;
 531        }
 532
 533        if (!strcmp(var, "committer.name")) {
 534                if (!value)
 535                        return config_error_nonbool(var);
 536                strbuf_reset(&git_committer_name);
 537                strbuf_addstr(&git_committer_name, value);
 538                committer_ident_explicitly_given |= IDENT_NAME_GIVEN;
 539                ident_config_given |= IDENT_NAME_GIVEN;
 540                return 0;
 541        }
 542
 543        if (!strcmp(var, "committer.email")) {
 544                if (!value)
 545                        return config_error_nonbool(var);
 546                strbuf_reset(&git_committer_email);
 547                strbuf_addstr(&git_committer_email, value);
 548                committer_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 549                ident_config_given |= IDENT_MAIL_GIVEN;
 550                return 0;
 551        }
 552
 553        if (!strcmp(var, "user.name")) {
 554                if (!value)
 555                        return config_error_nonbool(var);
 556                strbuf_reset(&git_default_name);
 557                strbuf_addstr(&git_default_name, value);
 558                committer_ident_explicitly_given |= IDENT_NAME_GIVEN;
 559                author_ident_explicitly_given |= IDENT_NAME_GIVEN;
 560                ident_config_given |= IDENT_NAME_GIVEN;
 561                return 0;
 562        }
 563
 564        if (!strcmp(var, "user.email")) {
 565                if (!value)
 566                        return config_error_nonbool(var);
 567                strbuf_reset(&git_default_email);
 568                strbuf_addstr(&git_default_email, value);
 569                committer_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 570                author_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 571                ident_config_given |= IDENT_MAIL_GIVEN;
 572                return 0;
 573        }
 574
 575        return 0;
 576}
 577
 578int git_ident_config(const char *var, const char *value, void *data)
 579{
 580        if (!strcmp(var, "user.useconfigonly")) {
 581                ident_use_config_only = git_config_bool(var, value);
 582                return 0;
 583        }
 584
 585        return set_ident(var, value);
 586}
 587
 588static int buf_cmp(const char *a_begin, const char *a_end,
 589                   const char *b_begin, const char *b_end)
 590{
 591        int a_len = a_end - a_begin;
 592        int b_len = b_end - b_begin;
 593        int min = a_len < b_len ? a_len : b_len;
 594        int cmp;
 595
 596        cmp = memcmp(a_begin, b_begin, min);
 597        if (cmp)
 598                return cmp;
 599
 600        return a_len - b_len;
 601}
 602
 603int ident_cmp(const struct ident_split *a,
 604              const struct ident_split *b)
 605{
 606        int cmp;
 607
 608        cmp = buf_cmp(a->mail_begin, a->mail_end,
 609                      b->mail_begin, b->mail_end);
 610        if (cmp)
 611                return cmp;
 612
 613        return buf_cmp(a->name_begin, a->name_end,
 614                       b->name_begin, b->name_end);
 615}