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