Andrew's git / gitweb.git / ident.c
?
ident.con commit sha1_file: rename LOOKUP_UNKNOWN_OBJECT (19fc5e8)
   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
  10static 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;
  15
  16static 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)
  21static int committer_ident_explicitly_given;
  22static int author_ident_explicitly_given;
  23static 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
  31static 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
  50static 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
  70static int add_mailname_host(struct strbuf *buf)
  71{
  72        FILE *mailname;
  73        struct strbuf mailnamebuf = STRBUF_INIT;
  74
  75        mailname = fopen_or_warn("/etc/mailname", "r");
  76        if (!mailname)
  77                return -1;
  78
  79        if (strbuf_getline(&mailnamebuf, mailname) == EOF) {
  80                if (ferror(mailname))
  81                        warning_errno("cannot read /etc/mailname");
  82                strbuf_release(&mailnamebuf);
  83                fclose(mailname);
  84                return -1;
  85        }
  86        /* success! */
  87        strbuf_addbuf(buf, &mailnamebuf);
  88        strbuf_release(&mailnamebuf);
  89        fclose(mailname);
  90        return 0;
  91}
  92
  93static int canonical_name(const char *host, struct strbuf *out)
  94{
  95        int status = -1;
  96
  97#ifndef NO_IPV6
  98        struct addrinfo hints, *ai;
  99        memset (&hints, '\0', sizeof (hints));
 100        hints.ai_flags = AI_CANONNAME;
 101        if (!getaddrinfo(host, NULL, &hints, &ai)) {
 102                if (ai && ai->ai_canonname && strchr(ai->ai_canonname, '.')) {
 103                        strbuf_addstr(out, ai->ai_canonname);
 104                        status = 0;
 105                }
 106                freeaddrinfo(ai);
 107        }
 108#else
 109        struct hostent *he = gethostbyname(host);
 110        if (he && strchr(he->h_name, '.')) {
 111                strbuf_addstr(out, he->h_name);
 112                status = 0;
 113        }
 114#endif /* NO_IPV6 */
 115
 116        return status;
 117}
 118
 119static void add_domainname(struct strbuf *out, int *is_bogus)
 120{
 121        char buf[HOST_NAME_MAX + 1];
 122
 123        if (xgethostname(buf, sizeof(buf))) {
 124                warning_errno("cannot get host name");
 125                strbuf_addstr(out, "(none)");
 126                *is_bogus = 1;
 127                return;
 128        }
 129        if (strchr(buf, '.'))
 130                strbuf_addstr(out, buf);
 131        else if (canonical_name(buf, out) < 0) {
 132                strbuf_addf(out, "%s.(none)", buf);
 133                *is_bogus = 1;
 134        }
 135}
 136
 137static void copy_email(const struct passwd *pw, struct strbuf *email,
 138                       int *is_bogus)
 139{
 140        /*
 141         * Make up a fake email address
 142         * (name + '@' + hostname [+ '.' + domainname])
 143         */
 144        strbuf_addstr(email, pw->pw_name);
 145        strbuf_addch(email, '@');
 146
 147        if (!add_mailname_host(email))
 148                return; /* read from "/etc/mailname" (Debian) */
 149        add_domainname(email, is_bogus);
 150}
 151
 152const char *ident_default_name(void)
 153{
 154        if (!(ident_config_given & IDENT_NAME_GIVEN) && !git_default_name.len) {
 155                copy_gecos(xgetpwuid_self(&default_name_is_bogus), &git_default_name);
 156                strbuf_trim(&git_default_name);
 157        }
 158        return git_default_name.buf;
 159}
 160
 161const char *ident_default_email(void)
 162{
 163        if (!(ident_config_given & IDENT_MAIL_GIVEN) && !git_default_email.len) {
 164                const char *email = getenv("EMAIL");
 165
 166                if (email && email[0]) {
 167                        strbuf_addstr(&git_default_email, email);
 168                        committer_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 169                        author_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 170                } else
 171                        copy_email(xgetpwuid_self(&default_email_is_bogus),
 172                                   &git_default_email, &default_email_is_bogus);
 173                strbuf_trim(&git_default_email);
 174        }
 175        return git_default_email.buf;
 176}
 177
 178static const char *ident_default_date(void)
 179{
 180        if (!git_default_date.len)
 181                datestamp(&git_default_date);
 182        return git_default_date.buf;
 183}
 184
 185void reset_ident_date(void)
 186{
 187        strbuf_reset(&git_default_date);
 188}
 189
 190static int crud(unsigned char c)
 191{
 192        return  c <= 32  ||
 193                c == '.' ||
 194                c == ',' ||
 195                c == ':' ||
 196                c == ';' ||
 197                c == '<' ||
 198                c == '>' ||
 199                c == '"' ||
 200                c == '\\' ||
 201                c == '\'';
 202}
 203
 204static int has_non_crud(const char *str)
 205{
 206        for (; *str; str++) {
 207                if (!crud(*str))
 208                        return 1;
 209        }
 210        return 0;
 211}
 212
 213/*
 214 * Copy over a string to the destination, but avoid special
 215 * characters ('\n', '<' and '>') and remove crud at the end
 216 */
 217static void strbuf_addstr_without_crud(struct strbuf *sb, const char *src)
 218{
 219        size_t i, len;
 220        unsigned char c;
 221
 222        /* Remove crud from the beginning.. */
 223        while ((c = *src) != 0) {
 224                if (!crud(c))
 225                        break;
 226                src++;
 227        }
 228
 229        /* Remove crud from the end.. */
 230        len = strlen(src);
 231        while (len > 0) {
 232                c = src[len-1];
 233                if (!crud(c))
 234                        break;
 235                --len;
 236        }
 237
 238        /*
 239         * Copy the rest to the buffer, but avoid the special
 240         * characters '\n' '<' and '>' that act as delimiters on
 241         * an identification line. We can only remove crud, never add it,
 242         * so 'len' is our maximum.
 243         */
 244        strbuf_grow(sb, len);
 245        for (i = 0; i < len; i++) {
 246                c = *src++;
 247                switch (c) {
 248                case '\n': case '<': case '>':
 249                        continue;
 250                }
 251                sb->buf[sb->len++] = c;
 252        }
 253        sb->buf[sb->len] = '\0';
 254}
 255
 256/*
 257 * Reverse of fmt_ident(); given an ident line, split the fields
 258 * to allow the caller to parse it.
 259 * Signal a success by returning 0, but date/tz fields of the result
 260 * can still be NULL if the input line only has the name/email part
 261 * (e.g. reading from a reflog entry).
 262 */
 263int split_ident_line(struct ident_split *split, const char *line, int len)
 264{
 265        const char *cp;
 266        size_t span;
 267        int status = -1;
 268
 269        memset(split, 0, sizeof(*split));
 270
 271        split->name_begin = line;
 272        for (cp = line; *cp && cp < line + len; cp++)
 273                if (*cp == '<') {
 274                        split->mail_begin = cp + 1;
 275                        break;
 276                }
 277        if (!split->mail_begin)
 278                return status;
 279
 280        for (cp = split->mail_begin - 2; line <= cp; cp--)
 281                if (!isspace(*cp)) {
 282                        split->name_end = cp + 1;
 283                        break;
 284                }
 285        if (!split->name_end) {
 286                /* no human readable name */
 287                split->name_end = split->name_begin;
 288        }
 289
 290        for (cp = split->mail_begin; cp < line + len; cp++)
 291                if (*cp == '>') {
 292                        split->mail_end = cp;
 293                        break;
 294                }
 295        if (!split->mail_end)
 296                return status;
 297
 298        /*
 299         * Look from the end-of-line to find the trailing ">" of the mail
 300         * address, even though we should already know it as split->mail_end.
 301         * This can help in cases of broken idents with an extra ">" somewhere
 302         * in the email address.  Note that we are assuming the timestamp will
 303         * never have a ">" in it.
 304         *
 305         * Note that we will always find some ">" before going off the front of
 306         * the string, because will always hit the split->mail_end closing
 307         * bracket.
 308         */
 309        for (cp = line + len - 1; *cp != '>'; cp--)
 310                ;
 311
 312        for (cp = cp + 1; cp < line + len && isspace(*cp); cp++)
 313                ;
 314        if (line + len <= cp)
 315                goto person_only;
 316        split->date_begin = cp;
 317        span = strspn(cp, "0123456789");
 318        if (!span)
 319                goto person_only;
 320        split->date_end = split->date_begin + span;
 321        for (cp = split->date_end; cp < line + len && isspace(*cp); cp++)
 322                ;
 323        if (line + len <= cp || (*cp != '+' && *cp != '-'))
 324                goto person_only;
 325        split->tz_begin = cp;
 326        span = strspn(cp + 1, "0123456789");
 327        if (!span)
 328                goto person_only;
 329        split->tz_end = split->tz_begin + 1 + span;
 330        return 0;
 331
 332person_only:
 333        split->date_begin = NULL;
 334        split->date_end = NULL;
 335        split->tz_begin = NULL;
 336        split->tz_end = NULL;
 337        return 0;
 338}
 339
 340static const char *env_hint =
 341N_("\n"
 342   "*** Please tell me who you are.\n"
 343   "\n"
 344   "Run\n"
 345   "\n"
 346   "  git config --global user.email \"you@example.com\"\n"
 347   "  git config --global user.name \"Your Name\"\n"
 348   "\n"
 349   "to set your account\'s default identity.\n"
 350   "Omit --global to set the identity only in this repository.\n"
 351   "\n");
 352
 353const char *fmt_ident(const char *name, const char *email,
 354                      const char *date_str, int flag)
 355{
 356        static struct strbuf ident = STRBUF_INIT;
 357        int strict = (flag & IDENT_STRICT);
 358        int want_date = !(flag & IDENT_NO_DATE);
 359        int want_name = !(flag & IDENT_NO_NAME);
 360
 361        if (!email) {
 362                if (strict && ident_use_config_only
 363                    && !(ident_config_given & IDENT_MAIL_GIVEN)) {
 364                        fputs(_(env_hint), stderr);
 365                        die(_("no email was given and auto-detection is disabled"));
 366                }
 367                email = ident_default_email();
 368                if (strict && default_email_is_bogus) {
 369                        fputs(_(env_hint), stderr);
 370                        die(_("unable to auto-detect email address (got '%s')"), email);
 371                }
 372        }
 373
 374        if (want_name) {
 375                int using_default = 0;
 376                if (!name) {
 377                        if (strict && ident_use_config_only
 378                            && !(ident_config_given & IDENT_NAME_GIVEN)) {
 379                                fputs(_(env_hint), stderr);
 380                                die(_("no name was given and auto-detection is disabled"));
 381                        }
 382                        name = ident_default_name();
 383                        using_default = 1;
 384                        if (strict && default_name_is_bogus) {
 385                                fputs(_(env_hint), stderr);
 386                                die(_("unable to auto-detect name (got '%s')"), name);
 387                        }
 388                }
 389                if (!*name) {
 390                        struct passwd *pw;
 391                        if (strict) {
 392                                if (using_default)
 393                                        fputs(_(env_hint), stderr);
 394                                die(_("empty ident name (for <%s>) not allowed"), email);
 395                        }
 396                        pw = xgetpwuid_self(NULL);
 397                        name = pw->pw_name;
 398                }
 399                if (strict && !has_non_crud(name))
 400                        die(_("name consists only of disallowed characters: %s"), name);
 401        }
 402
 403        strbuf_reset(&ident);
 404        if (want_name) {
 405                strbuf_addstr_without_crud(&ident, name);
 406                strbuf_addstr(&ident, " <");
 407        }
 408        strbuf_addstr_without_crud(&ident, email);
 409        if (want_name)
 410                        strbuf_addch(&ident, '>');
 411        if (want_date) {
 412                strbuf_addch(&ident, ' ');
 413                if (date_str && date_str[0]) {
 414                        if (parse_date(date_str, &ident) < 0)
 415                                die(_("invalid date format: %s"), date_str);
 416                }
 417                else
 418                        strbuf_addstr(&ident, ident_default_date());
 419        }
 420
 421        return ident.buf;
 422}
 423
 424const char *fmt_name(const char *name, const char *email)
 425{
 426        return fmt_ident(name, email, NULL, IDENT_STRICT | IDENT_NO_DATE);
 427}
 428
 429const char *git_author_info(int flag)
 430{
 431        if (getenv("GIT_AUTHOR_NAME"))
 432                author_ident_explicitly_given |= IDENT_NAME_GIVEN;
 433        if (getenv("GIT_AUTHOR_EMAIL"))
 434                author_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 435        return fmt_ident(getenv("GIT_AUTHOR_NAME"),
 436                         getenv("GIT_AUTHOR_EMAIL"),
 437                         getenv("GIT_AUTHOR_DATE"),
 438                         flag);
 439}
 440
 441const char *git_committer_info(int flag)
 442{
 443        if (getenv("GIT_COMMITTER_NAME"))
 444                committer_ident_explicitly_given |= IDENT_NAME_GIVEN;
 445        if (getenv("GIT_COMMITTER_EMAIL"))
 446                committer_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 447        return fmt_ident(getenv("GIT_COMMITTER_NAME"),
 448                         getenv("GIT_COMMITTER_EMAIL"),
 449                         getenv("GIT_COMMITTER_DATE"),
 450                         flag);
 451}
 452
 453static int ident_is_sufficient(int user_ident_explicitly_given)
 454{
 455#ifndef WINDOWS
 456        return (user_ident_explicitly_given & IDENT_MAIL_GIVEN);
 457#else
 458        return (user_ident_explicitly_given == IDENT_ALL_GIVEN);
 459#endif
 460}
 461
 462int committer_ident_sufficiently_given(void)
 463{
 464        return ident_is_sufficient(committer_ident_explicitly_given);
 465}
 466
 467int author_ident_sufficiently_given(void)
 468{
 469        return ident_is_sufficient(author_ident_explicitly_given);
 470}
 471
 472int git_ident_config(const char *var, const char *value, void *data)
 473{
 474        if (!strcmp(var, "user.useconfigonly")) {
 475                ident_use_config_only = git_config_bool(var, value);
 476                return 0;
 477        }
 478
 479        if (!strcmp(var, "user.name")) {
 480                if (!value)
 481                        return config_error_nonbool(var);
 482                strbuf_reset(&git_default_name);
 483                strbuf_addstr(&git_default_name, value);
 484                committer_ident_explicitly_given |= IDENT_NAME_GIVEN;
 485                author_ident_explicitly_given |= IDENT_NAME_GIVEN;
 486                ident_config_given |= IDENT_NAME_GIVEN;
 487                return 0;
 488        }
 489
 490        if (!strcmp(var, "user.email")) {
 491                if (!value)
 492                        return config_error_nonbool(var);
 493                strbuf_reset(&git_default_email);
 494                strbuf_addstr(&git_default_email, value);
 495                committer_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 496                author_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 497                ident_config_given |= IDENT_MAIL_GIVEN;
 498                return 0;
 499        }
 500
 501        return 0;
 502}
 503
 504static int buf_cmp(const char *a_begin, const char *a_end,
 505                   const char *b_begin, const char *b_end)
 506{
 507        int a_len = a_end - a_begin;
 508        int b_len = b_end - b_begin;
 509        int min = a_len < b_len ? a_len : b_len;
 510        int cmp;
 511
 512        cmp = memcmp(a_begin, b_begin, min);
 513        if (cmp)
 514                return cmp;
 515
 516        return a_len - b_len;
 517}
 518
 519int ident_cmp(const struct ident_split *a,
 520              const struct ident_split *b)
 521{
 522        int cmp;
 523
 524        cmp = buf_cmp(a->mail_begin, a->mail_end,
 525                      b->mail_begin, b->mail_end);
 526        if (cmp)
 527                return cmp;
 528
 529        return buf_cmp(a->name_begin, a->name_end,
 530                       b->name_begin, b->name_end);
 531}