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