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
  14 #define IDENT_NAME_GIVEN 01
  15 #define IDENT_MAIL_GIVEN 02
  16 #define IDENT_ALL_GIVEN (IDENT_NAME_GIVEN|IDENT_MAIL_GIVEN)
  17 static int committer_ident_explicitly_given;
  18 static int author_ident_explicitly_given;
  19
  20 #ifdef NO_GECOS_IN_PWENT
  21 #define get_gecos(ignored) "&"
  22 #else
  23 #define get_gecos(struct_passwd) ((struct_passwd)->pw_gecos)
  24 #endif
  25
  26 static void copy_gecos(const struct passwd *w, struct strbuf *name)
  27 {
  28         char *src;
  29
  30         /* Traditionally GECOS field had office phone numbers etc, separated
  31          * with commas.  Also & stands for capitalized form of the login name.
  32          */
  33
  34         for (src = get_gecos(w); *src && *src != ','; src++) {
  35                 int ch = *src;
  36                 if (ch != '&')
  37                         strbuf_addch(name, ch);
  38                 else {
  39                         /* Sorry, Mr. McDonald... */
  40                         strbuf_addch(name, toupper(*w->pw_name));
  41                         strbuf_addstr(name, w->pw_name + 1);
  42                 }
  43         }
  44 }
  45
  46 static int add_mailname_host(struct strbuf *buf)
  47 {
  48         FILE *mailname;
  49         struct strbuf mailnamebuf = STRBUF_INIT;
  50
  51         mailname = fopen("/etc/mailname", "r");
  52         if (!mailname) {
  53                 if (errno != ENOENT)
  54                         warning("cannot open /etc/mailname: %s",
  55                                 strerror(errno));
  56                 return -1;
  57         }
  58         if (strbuf_getline(&mailnamebuf, mailname, '\n') == EOF) {
  59                 if (ferror(mailname))
  60                         warning("cannot read /etc/mailname: %s",
  61                                 strerror(errno));
  62                 strbuf_release(&mailnamebuf);
  63                 fclose(mailname);
  64                 return -1;
  65         }
  66         /* success! */
  67         strbuf_addbuf(buf, &mailnamebuf);
  68         strbuf_release(&mailnamebuf);
  69         fclose(mailname);
  70         return 0;
  71 }
  72
  73 static void add_domainname(struct strbuf *out)
  74 {
  75         char buf[1024];
  76         struct hostent *he;
  77
  78         if (gethostname(buf, sizeof(buf))) {
  79                 warning("cannot get host name: %s", strerror(errno));
  80                 strbuf_addstr(out, "(none)");
  81                 return;
  82         }
  83         if (strchr(buf, '.'))
  84                 strbuf_addstr(out, buf);
  85         else if ((he = gethostbyname(buf)) && strchr(he->h_name, '.'))
  86                 strbuf_addstr(out, he->h_name);
  87         else
  88                 strbuf_addf(out, "%s.(none)", buf);
  89 }
  90
  91 static void copy_email(const struct passwd *pw, struct strbuf *email)
  92 {
  93         /*
  94          * Make up a fake email address
  95          * (name + '@' + hostname [+ '.' + domainname])
  96          */
  97         strbuf_addstr(email, pw->pw_name);
  98         strbuf_addch(email, '@');
  99
 100         if (!add_mailname_host(email))
 101                 return; /* read from "/etc/mailname" (Debian) */
 102         add_domainname(email);
 103 }
 104
 105 static const char *ident_default_name(void)
 106 {
 107         if (!git_default_name.len) {
 108                 copy_gecos(xgetpwuid_self(), &git_default_name);
 109                 strbuf_trim(&git_default_name);
 110         }
 111         return git_default_name.buf;
 112 }
 113
 114 const char *ident_default_email(void)
 115 {
 116         if (!git_default_email.len) {
 117                 const char *email = getenv("EMAIL");
 118
 119                 if (email && email[0]) {
 120                         strbuf_addstr(&git_default_email, email);
 121                         committer_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 122                         author_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 123                 } else
 124                         copy_email(xgetpwuid_self(), &git_default_email);
 125                 strbuf_trim(&git_default_email);
 126         }
 127         return git_default_email.buf;
 128 }
 129
 130 static const char *ident_default_date(void)
 131 {
 132         if (!git_default_date.len)
 133                 datestamp(&git_default_date);
 134         return git_default_date.buf;
 135 }
 136
 137 static int crud(unsigned char c)
 138 {
 139         return  c <= 32  ||
 140                 c == '.' ||
 141                 c == ',' ||
 142                 c == ':' ||
 143                 c == ';' ||
 144                 c == '<' ||
 145                 c == '>' ||
 146                 c == '"' ||
 147                 c == '\\' ||
 148                 c == '\'';
 149 }
 150
 151 /*
 152  * Copy over a string to the destination, but avoid special
 153  * characters ('\n', '<' and '>') and remove crud at the end
 154  */
 155 static void strbuf_addstr_without_crud(struct strbuf *sb, const char *src)
 156 {
 157         size_t i, len;
 158         unsigned char c;
 159
 160         /* Remove crud from the beginning.. */
 161         while ((c = *src) != 0) {
 162                 if (!crud(c))
 163                         break;
 164                 src++;
 165         }
 166
 167         /* Remove crud from the end.. */
 168         len = strlen(src);
 169         while (len > 0) {
 170                 c = src[len-1];
 171                 if (!crud(c))
 172                         break;
 173                 --len;
 174         }
 175
 176         /*
 177          * Copy the rest to the buffer, but avoid the special
 178          * characters '\n' '<' and '>' that act as delimiters on
 179          * an identification line. We can only remove crud, never add it,
 180          * so 'len' is our maximum.
 181          */
 182         strbuf_grow(sb, len);
 183         for (i = 0; i < len; i++) {
 184                 c = *src++;
 185                 switch (c) {
 186                 case '\n': case '<': case '>':
 187                         continue;
 188                 }
 189                 sb->buf[sb->len++] = c;
 190         }
 191         sb->buf[sb->len] = '\0';
 192 }
 193
 194 /*
 195  * Reverse of fmt_ident(); given an ident line, split the fields
 196  * to allow the caller to parse it.
 197  * Signal a success by returning 0, but date/tz fields of the result
 198  * can still be NULL if the input line only has the name/email part
 199  * (e.g. reading from a reflog entry).
 200  */
 201 int split_ident_line(struct ident_split *split, const char *line, int len)
 202 {
 203         const char *cp;
 204         size_t span;
 205         int status = -1;
 206
 207         memset(split, 0, sizeof(*split));
 208
 209         split->name_begin = line;
 210         for (cp = line; *cp && cp < line + len; cp++)
 211                 if (*cp == '<') {
 212                         split->mail_begin = cp + 1;
 213                         break;
 214                 }
 215         if (!split->mail_begin)
 216                 return status;
 217
 218         for (cp = split->mail_begin - 2; line <= cp; cp--)
 219                 if (!isspace(*cp)) {
 220                         split->name_end = cp + 1;
 221                         break;
 222                 }
 223         if (!split->name_end) {
 224                 /* no human readable name */
 225                 split->name_end = split->name_begin;
 226         }
 227
 228         for (cp = split->mail_begin; cp < line + len; cp++)
 229                 if (*cp == '>') {
 230                         split->mail_end = cp;
 231                         break;
 232                 }
 233         if (!split->mail_end)
 234                 return status;
 235
 236         /*
 237          * Look from the end-of-line to find the trailing ">" of the mail
 238          * address, even though we should already know it as split->mail_end.
 239          * This can help in cases of broken idents with an extra ">" somewhere
 240          * in the email address.  Note that we are assuming the timestamp will
 241          * never have a ">" in it.
 242          *
 243          * Note that we will always find some ">" before going off the front of
 244          * the string, because will always hit the split->mail_end closing
 245          * bracket.
 246          */
 247         for (cp = line + len - 1; *cp != '>'; cp--)
 248                 ;
 249
 250         for (cp = cp + 1; cp < line + len && isspace(*cp); cp++)
 251                 ;
 252         if (line + len <= cp)
 253                 goto person_only;
 254         split->date_begin = cp;
 255         span = strspn(cp, "0123456789");
 256         if (!span)
 257                 goto person_only;
 258         split->date_end = split->date_begin + span;
 259         for (cp = split->date_end; cp < line + len && isspace(*cp); cp++)
 260                 ;
 261         if (line + len <= cp || (*cp != '+' && *cp != '-'))
 262                 goto person_only;
 263         split->tz_begin = cp;
 264         span = strspn(cp + 1, "0123456789");
 265         if (!span)
 266                 goto person_only;
 267         split->tz_end = split->tz_begin + 1 + span;
 268         return 0;
 269
 270 person_only:
 271         split->date_begin = NULL;
 272         split->date_end = NULL;
 273         split->tz_begin = NULL;
 274         split->tz_end = NULL;
 275         return 0;
 276 }
 277
 278 static const char *env_hint =
 279 "\n"
 280 "*** Please tell me who you are.\n"
 281 "\n"
 282 "Run\n"
 283 "\n"
 284 "  git config --global user.email \"you@example.com\"\n"
 285 "  git config --global user.name \"Your Name\"\n"
 286 "\n"
 287 "to set your account\'s default identity.\n"
 288 "Omit --global to set the identity only in this repository.\n"
 289 "\n";
 290
 291 const char *fmt_ident(const char *name, const char *email,
 292                       const char *date_str, int flag)
 293 {
 294         static struct strbuf ident = STRBUF_INIT;
 295         int strict = (flag & IDENT_STRICT);
 296         int want_date = !(flag & IDENT_NO_DATE);
 297         int want_name = !(flag & IDENT_NO_NAME);
 298
 299         if (want_name && !name)
 300                 name = ident_default_name();
 301         if (!email)
 302                 email = ident_default_email();
 303
 304         if (want_name && !*name) {
 305                 struct passwd *pw;
 306
 307                 if (strict) {
 308                         if (name == git_default_name.buf)
 309                                 fputs(env_hint, stderr);
 310                         die("empty ident name (for <%s>) not allowed", email);
 311                 }
 312                 pw = xgetpwuid_self();
 313                 name = pw->pw_name;
 314         }
 315
 316         if (strict && email == git_default_email.buf &&
 317             strstr(email, "(none)")) {
 318                 fputs(env_hint, stderr);
 319                 die("unable to auto-detect email address (got '%s')", email);
 320         }
 321
 322         strbuf_reset(&ident);
 323         if (want_name) {
 324                 strbuf_addstr_without_crud(&ident, name);
 325                 strbuf_addstr(&ident, " <");
 326         }
 327         strbuf_addstr_without_crud(&ident, email);
 328         if (want_name)
 329                         strbuf_addch(&ident, '>');
 330         if (want_date) {
 331                 strbuf_addch(&ident, ' ');
 332                 if (date_str && date_str[0]) {
 333                         if (parse_date(date_str, &ident) < 0)
 334                                 die("invalid date format: %s", date_str);
 335                 }
 336                 else
 337                         strbuf_addstr(&ident, ident_default_date());
 338         }
 339
 340         return ident.buf;
 341 }
 342
 343 const char *fmt_name(const char *name, const char *email)
 344 {
 345         return fmt_ident(name, email, NULL, IDENT_STRICT | IDENT_NO_DATE);
 346 }
 347
 348 const char *git_author_info(int flag)
 349 {
 350         if (getenv("GIT_AUTHOR_NAME"))
 351                 author_ident_explicitly_given |= IDENT_NAME_GIVEN;
 352         if (getenv("GIT_AUTHOR_EMAIL"))
 353                 author_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 354         return fmt_ident(getenv("GIT_AUTHOR_NAME"),
 355                          getenv("GIT_AUTHOR_EMAIL"),
 356                          getenv("GIT_AUTHOR_DATE"),
 357                          flag);
 358 }
 359
 360 const char *git_committer_info(int flag)
 361 {
 362         if (getenv("GIT_COMMITTER_NAME"))
 363                 committer_ident_explicitly_given |= IDENT_NAME_GIVEN;
 364         if (getenv("GIT_COMMITTER_EMAIL"))
 365                 committer_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 366         return fmt_ident(getenv("GIT_COMMITTER_NAME"),
 367                          getenv("GIT_COMMITTER_EMAIL"),
 368                          getenv("GIT_COMMITTER_DATE"),
 369                          flag);
 370 }
 371
 372 static int ident_is_sufficient(int user_ident_explicitly_given)
 373 {
 374 #ifndef WINDOWS
 375         return (user_ident_explicitly_given & IDENT_MAIL_GIVEN);
 376 #else
 377         return (user_ident_explicitly_given == IDENT_ALL_GIVEN);
 378 #endif
 379 }
 380
 381 int committer_ident_sufficiently_given(void)
 382 {
 383         return ident_is_sufficient(committer_ident_explicitly_given);
 384 }
 385
 386 int author_ident_sufficiently_given(void)
 387 {
 388         return ident_is_sufficient(author_ident_explicitly_given);
 389 }
 390
 391 int git_ident_config(const char *var, const char *value, void *data)
 392 {
 393         if (!strcmp(var, "user.name")) {
 394                 if (!value)
 395                         return config_error_nonbool(var);
 396                 strbuf_reset(&git_default_name);
 397                 strbuf_addstr(&git_default_name, value);
 398                 committer_ident_explicitly_given |= IDENT_NAME_GIVEN;
 399                 author_ident_explicitly_given |= IDENT_NAME_GIVEN;
 400                 return 0;
 401         }
 402
 403         if (!strcmp(var, "user.email")) {
 404                 if (!value)
 405                         return config_error_nonbool(var);
 406                 strbuf_reset(&git_default_email);
 407                 strbuf_addstr(&git_default_email, value);
 408                 committer_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 409                 author_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 410                 return 0;
 411         }
 412
 413         return 0;
 414 }
 415
 416 static int buf_cmp(const char *a_begin, const char *a_end,
 417                    const char *b_begin, const char *b_end)
 418 {
 419         int a_len = a_end - a_begin;
 420         int b_len = b_end - b_begin;
 421         int min = a_len < b_len ? a_len : b_len;
 422         int cmp;
 423
 424         cmp = memcmp(a_begin, b_begin, min);
 425         if (cmp)
 426                 return cmp;
 427
 428         return a_len - b_len;
 429 }
 430
 431 int ident_cmp(const struct ident_split *a,
 432               const struct ident_split *b)
 433 {
 434         int cmp;
 435
 436         cmp = buf_cmp(a->mail_begin, a->mail_end,
 437                       b->mail_begin, b->mail_end);
 438         if (cmp)
 439                 return cmp;
 440
 441         return buf_cmp(a->name_begin, a->name_end,
 442                        b->name_begin, b->name_end);
 443 }