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 char git_default_date[50];
  11
  12 #ifdef NO_GECOS_IN_PWENT
  13 #define get_gecos(ignored) "&"
  14 #else
  15 #define get_gecos(struct_passwd) ((struct_passwd)->pw_gecos)
  16 #endif
  17
  18 static void copy_gecos(const struct passwd *w, char *name, size_t sz)
  19 {
  20         char *src, *dst;
  21         size_t len, nlen;
  22
  23         nlen = strlen(w->pw_name);
  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 (len = 0, dst = name, src = get_gecos(w); len < sz; src++) {
  30                 int ch = *src;
  31                 if (ch != '&') {
  32                         *dst++ = ch;
  33                         if (ch == 0 || ch == ',')
  34                                 break;
  35                         len++;
  36                         continue;
  37                 }
  38                 if (len + nlen < sz) {
  39                         /* Sorry, Mr. McDonald... */
  40                         *dst++ = toupper(*w->pw_name);
  41                         memcpy(dst, w->pw_name + 1, nlen - 1);
  42                         dst += nlen - 1;
  43                         len += nlen;
  44                 }
  45         }
  46         if (len < sz)
  47                 name[len] = 0;
  48         else
  49                 die("Your parents must have hated you!");
  50
  51 }
  52
  53 static int add_mailname_host(char *buf, size_t len)
  54 {
  55         FILE *mailname;
  56
  57         mailname = fopen("/etc/mailname", "r");
  58         if (!mailname) {
  59                 if (errno != ENOENT)
  60                         warning("cannot open /etc/mailname: %s",
  61                                 strerror(errno));
  62                 return -1;
  63         }
  64         if (!fgets(buf, len, mailname)) {
  65                 if (ferror(mailname))
  66                         warning("cannot read /etc/mailname: %s",
  67                                 strerror(errno));
  68                 fclose(mailname);
  69                 return -1;
  70         }
  71         /* success! */
  72         fclose(mailname);
  73         return 0;
  74 }
  75
  76 static void add_domainname(char *buf, size_t len)
  77 {
  78         struct hostent *he;
  79         size_t namelen;
  80         const char *domainname;
  81
  82         if (gethostname(buf, len)) {
  83                 warning("cannot get host name: %s", strerror(errno));
  84                 strlcpy(buf, "(none)", len);
  85                 return;
  86         }
  87         namelen = strlen(buf);
  88         if (memchr(buf, '.', namelen))
  89                 return;
  90
  91         he = gethostbyname(buf);
  92         buf[namelen++] = '.';
  93         buf += namelen;
  94         len -= namelen;
  95         if (he && (domainname = strchr(he->h_name, '.')))
  96                 strlcpy(buf, domainname + 1, len);
  97         else
  98                 strlcpy(buf, "(none)", len);
  99 }
 100
 101 static void copy_email(const struct passwd *pw)
 102 {
 103         /*
 104          * Make up a fake email address
 105          * (name + '@' + hostname [+ '.' + domainname])
 106          */
 107         size_t len = strlen(pw->pw_name);
 108         if (len > sizeof(git_default_email)/2)
 109                 die("Your sysadmin must hate you!");
 110         memcpy(git_default_email, pw->pw_name, len);
 111         git_default_email[len++] = '@';
 112
 113         if (!add_mailname_host(git_default_email + len,
 114                                 sizeof(git_default_email) - len))
 115                 return; /* read from "/etc/mailname" (Debian) */
 116         add_domainname(git_default_email + len,
 117                         sizeof(git_default_email) - len);
 118 }
 119
 120 static void setup_ident(const char **name, const char **emailp)
 121 {
 122         struct passwd *pw = NULL;
 123
 124         /* Get the name ("gecos") */
 125         if (!*name && !git_default_name[0]) {
 126                 pw = getpwuid(getuid());
 127                 if (!pw)
 128                         die("You don't exist. Go away!");
 129                 copy_gecos(pw, git_default_name, sizeof(git_default_name));
 130         }
 131         if (!*name)
 132                 *name = git_default_name;
 133
 134         if (!*emailp && !git_default_email[0]) {
 135                 const char *email = getenv("EMAIL");
 136
 137                 if (email && email[0]) {
 138                         strlcpy(git_default_email, email,
 139                                 sizeof(git_default_email));
 140                         user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 141                 } else {
 142                         if (!pw)
 143                                 pw = getpwuid(getuid());
 144                         if (!pw)
 145                                 die("You don't exist. Go away!");
 146                         copy_email(pw);
 147                 }
 148         }
 149         if (!*emailp)
 150                 *emailp = git_default_email;
 151
 152         /* And set the default date */
 153         if (!git_default_date[0])
 154                 datestamp(git_default_date, sizeof(git_default_date));
 155 }
 156
 157 static int add_raw(char *buf, size_t size, int offset, const char *str)
 158 {
 159         size_t len = strlen(str);
 160         if (offset + len > size)
 161                 return size;
 162         memcpy(buf + offset, str, len);
 163         return offset + len;
 164 }
 165
 166 static int crud(unsigned char c)
 167 {
 168         return  c <= 32  ||
 169                 c == '.' ||
 170                 c == ',' ||
 171                 c == ':' ||
 172                 c == ';' ||
 173                 c == '<' ||
 174                 c == '>' ||
 175                 c == '"' ||
 176                 c == '\\' ||
 177                 c == '\'';
 178 }
 179
 180 /*
 181  * Copy over a string to the destination, but avoid special
 182  * characters ('\n', '<' and '>') and remove crud at the end
 183  */
 184 static int copy(char *buf, size_t size, int offset, const char *src)
 185 {
 186         size_t i, len;
 187         unsigned char c;
 188
 189         /* Remove crud from the beginning.. */
 190         while ((c = *src) != 0) {
 191                 if (!crud(c))
 192                         break;
 193                 src++;
 194         }
 195
 196         /* Remove crud from the end.. */
 197         len = strlen(src);
 198         while (len > 0) {
 199                 c = src[len-1];
 200                 if (!crud(c))
 201                         break;
 202                 --len;
 203         }
 204
 205         /*
 206          * Copy the rest to the buffer, but avoid the special
 207          * characters '\n' '<' and '>' that act as delimiters on
 208          * an identification line
 209          */
 210         for (i = 0; i < len; i++) {
 211                 c = *src++;
 212                 switch (c) {
 213                 case '\n': case '<': case '>':
 214                         continue;
 215                 }
 216                 if (offset >= size)
 217                         return size;
 218                 buf[offset++] = c;
 219         }
 220         return offset;
 221 }
 222
 223 static const char *env_hint =
 224 "\n"
 225 "*** Please tell me who you are.\n"
 226 "\n"
 227 "Run\n"
 228 "\n"
 229 "  git config --global user.email \"you@example.com\"\n"
 230 "  git config --global user.name \"Your Name\"\n"
 231 "\n"
 232 "to set your account\'s default identity.\n"
 233 "Omit --global to set the identity only in this repository.\n"
 234 "\n";
 235
 236 const char *fmt_ident(const char *name, const char *email,
 237                       const char *date_str, int flag)
 238 {
 239         static char buffer[1000];
 240         char date[50];
 241         int i;
 242         int error_on_no_name = (flag & IDENT_ERROR_ON_NO_NAME);
 243         int warn_on_no_name = (flag & IDENT_WARN_ON_NO_NAME);
 244         int name_addr_only = (flag & IDENT_NO_DATE);
 245
 246         setup_ident(&name, &email);
 247
 248         if (!*name) {
 249                 struct passwd *pw;
 250
 251                 if ((warn_on_no_name || error_on_no_name) &&
 252                     name == git_default_name && env_hint) {
 253                         fputs(env_hint, stderr);
 254                         env_hint = NULL; /* warn only once */
 255                 }
 256                 if (error_on_no_name)
 257                         die("empty ident %s <%s> not allowed", name, email);
 258                 pw = getpwuid(getuid());
 259                 if (!pw)
 260                         die("You don't exist. Go away!");
 261                 strlcpy(git_default_name, pw->pw_name,
 262                         sizeof(git_default_name));
 263                 name = git_default_name;
 264         }
 265
 266         strcpy(date, git_default_date);
 267         if (!name_addr_only && date_str && date_str[0]) {
 268                 if (parse_date(date_str, date, sizeof(date)) < 0)
 269                         die("invalid date format: %s", date_str);
 270         }
 271
 272         i = copy(buffer, sizeof(buffer), 0, name);
 273         i = add_raw(buffer, sizeof(buffer), i, " <");
 274         i = copy(buffer, sizeof(buffer), i, email);
 275         if (!name_addr_only) {
 276                 i = add_raw(buffer, sizeof(buffer), i,  "> ");
 277                 i = copy(buffer, sizeof(buffer), i, date);
 278         } else {
 279                 i = add_raw(buffer, sizeof(buffer), i, ">");
 280         }
 281         if (i >= sizeof(buffer))
 282                 die("Impossibly long personal identifier");
 283         buffer[i] = 0;
 284         return buffer;
 285 }
 286
 287 const char *fmt_name(const char *name, const char *email)
 288 {
 289         return fmt_ident(name, email, NULL, IDENT_ERROR_ON_NO_NAME | IDENT_NO_DATE);
 290 }
 291
 292 const char *git_author_info(int flag)
 293 {
 294         return fmt_ident(getenv("GIT_AUTHOR_NAME"),
 295                          getenv("GIT_AUTHOR_EMAIL"),
 296                          getenv("GIT_AUTHOR_DATE"),
 297                          flag);
 298 }
 299
 300 const char *git_committer_info(int flag)
 301 {
 302         if (getenv("GIT_COMMITTER_NAME"))
 303                 user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 304         if (getenv("GIT_COMMITTER_EMAIL"))
 305                 user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 306         return fmt_ident(getenv("GIT_COMMITTER_NAME"),
 307                          getenv("GIT_COMMITTER_EMAIL"),
 308                          getenv("GIT_COMMITTER_DATE"),
 309                          flag);
 310 }
 311
 312 int user_ident_sufficiently_given(void)
 313 {
 314 #ifndef WINDOWS
 315         return (user_ident_explicitly_given & IDENT_MAIL_GIVEN);
 316 #else
 317         return (user_ident_explicitly_given == IDENT_ALL_GIVEN);
 318 #endif
 319 }