ident.con commit Merge branch 'jk/more-comments-on-textconv' (3ed26a4)
   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("/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
  97static 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
 123static 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
 141static 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
 156const 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
 165const 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
 182static 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
 189static 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 */
 207static 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 */
 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
 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
 322person_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
 330static 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
 343const 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                        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
 376        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
 387        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
 405        return ident.buf;
 406}
 407
 408const char *fmt_name(const char *name, const char *email)
 409{
 410        return fmt_ident(name, email, NULL, IDENT_STRICT | IDENT_NO_DATE);
 411}
 412
 413const 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}
 424
 425const 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}
 436
 437static 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}
 445
 446int committer_ident_sufficiently_given(void)
 447{
 448        return ident_is_sufficient(committer_ident_explicitly_given);
 449}
 450
 451int author_ident_sufficiently_given(void)
 452{
 453        return ident_is_sufficient(author_ident_explicitly_given);
 454}
 455
 456int 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
 463        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
 474        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
 485        return 0;
 486}
 487
 488static 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
 496        cmp = memcmp(a_begin, b_begin, min);
 497        if (cmp)
 498                return cmp;
 499
 500        return a_len - b_len;
 501}
 502
 503int ident_cmp(const struct ident_split *a,
 504              const struct ident_split *b)
 505{
 506        int cmp;
 507
 508        cmp = buf_cmp(a->mail_begin, a->mail_end,
 509                      b->mail_begin, b->mail_end);
 510        if (cmp)
 511                return cmp;
 512
 513        return buf_cmp(a->name_begin, a->name_end,
 514                       b->name_begin, b->name_end);
 515}