git/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 #ifndef NO_ETC_PASSWD
  13
  14 static void copy_gecos(const struct passwd *w, char *name, size_t sz)
  15 {
  16         char *src, *dst;
  17         size_t len, nlen;
  18
  19         nlen = strlen(w->pw_name);
  20
  21         /* Traditionally GECOS field had office phone numbers etc, separated
  22          * with commas.  Also & stands for capitalized form of the login name.
  23          */
  24
  25         for (len = 0, dst = name, src = w->pw_gecos; len < sz; src++) {
  26                 int ch = *src;
  27                 if (ch != '&') {
  28                         *dst++ = ch;
  29                         if (ch == 0 || ch == ',')
  30                                 break;
  31                         len++;
  32                         continue;
  33                 }
  34                 if (len + nlen < sz) {
  35                         /* Sorry, Mr. McDonald... */
  36                         *dst++ = toupper(*w->pw_name);
  37                         memcpy(dst, w->pw_name + 1, nlen - 1);
  38                         dst += nlen - 1;
  39                 }
  40         }
  41         if (len < sz)
  42                 name[len] = 0;
  43         else
  44                 die("Your parents must have hated you!");
  45
  46 }
  47
  48 static void copy_email(const struct passwd *pw)
  49 {
  50         /*
  51          * Make up a fake email address
  52          * (name + '@' + hostname [+ '.' + domainname])
  53          */
  54         size_t len = strlen(pw->pw_name);
  55         if (len > sizeof(git_default_email)/2)
  56                 die("Your sysadmin must hate you!");
  57         memcpy(git_default_email, pw->pw_name, len);
  58         git_default_email[len++] = '@';
  59         gethostname(git_default_email + len, sizeof(git_default_email) - len);
  60         if (!strchr(git_default_email+len, '.')) {
  61                 struct hostent *he = gethostbyname(git_default_email + len);
  62                 char *domainname;
  63
  64                 len = strlen(git_default_email);
  65                 git_default_email[len++] = '.';
  66                 if (he && (domainname = strchr(he->h_name, '.')))
  67                         strlcpy(git_default_email + len, domainname + 1,
  68                                 sizeof(git_default_email) - len);
  69                 else
  70                         strlcpy(git_default_email + len, "(none)",
  71                                 sizeof(git_default_email) - len);
  72         }
  73 }
  74
  75 #endif
  76
  77 static void setup_ident(void)
  78 {
  79 #ifndef NO_ETC_PASSWD
  80         struct passwd *pw = NULL;
  81
  82         /* Get the name ("gecos") */
  83         if (!git_default_name[0]) {
  84                 pw = getpwuid(getuid());
  85                 if (!pw)
  86                         die("You don't exist. Go away!");
  87                 copy_gecos(pw, git_default_name, sizeof(git_default_name));
  88         }
  89
  90         if (!git_default_email[0]) {
  91                 const char *email = getenv("EMAIL");
  92
  93                 if (email && email[0])
  94                         strlcpy(git_default_email, email,
  95                                 sizeof(git_default_email));
  96                 else {
  97                         if (!pw)
  98                                 pw = getpwuid(getuid());
  99                         if (!pw)
 100                                 die("You don't exist. Go away!");
 101                         copy_email(pw);
 102                 }
 103         }
 104 #endif
 105
 106         /* And set the default date */
 107         if (!git_default_date[0])
 108                 datestamp(git_default_date, sizeof(git_default_date));
 109 }
 110
 111 static int add_raw(char *buf, size_t size, int offset, const char *str)
 112 {
 113         size_t len = strlen(str);
 114         if (offset + len > size)
 115                 return size;
 116         memcpy(buf + offset, str, len);
 117         return offset + len;
 118 }
 119
 120 static int crud(unsigned char c)
 121 {
 122         static char crud_array[256];
 123         static int crud_array_initialized = 0;
 124
 125         if (!crud_array_initialized) {
 126                 int k;
 127
 128                 for (k = 0; k <= 31; ++k) crud_array[k] = 1;
 129                 crud_array[' '] = 1;
 130                 crud_array['.'] = 1;
 131                 crud_array[','] = 1;
 132                 crud_array[':'] = 1;
 133                 crud_array[';'] = 1;
 134                 crud_array['<'] = 1;
 135                 crud_array['>'] = 1;
 136                 crud_array['"'] = 1;
 137                 crud_array['\''] = 1;
 138                 crud_array_initialized = 1;
 139         }
 140         return crud_array[c];
 141 }
 142
 143 /*
 144  * Copy over a string to the destination, but avoid special
 145  * characters ('\n', '<' and '>') and remove crud at the end
 146  */
 147 static int copy(char *buf, size_t size, int offset, const char *src)
 148 {
 149         size_t i, len;
 150         unsigned char c;
 151
 152         /* Remove crud from the beginning.. */
 153         while ((c = *src) != 0) {
 154                 if (!crud(c))
 155                         break;
 156                 src++;
 157         }
 158
 159         /* Remove crud from the end.. */
 160         len = strlen(src);
 161         while (len > 0) {
 162                 c = src[len-1];
 163                 if (!crud(c))
 164                         break;
 165                 --len;
 166         }
 167
 168         /*
 169          * Copy the rest to the buffer, but avoid the special
 170          * characters '\n' '<' and '>' that act as delimiters on
 171          * a identification line
 172          */
 173         for (i = 0; i < len; i++) {
 174                 c = *src++;
 175                 switch (c) {
 176                 case '\n': case '<': case '>':
 177                         continue;
 178                 }
 179                 if (offset >= size)
 180                         return size;
 181                 buf[offset++] = c;
 182         }
 183         return offset;
 184 }
 185
 186 static const char au_env[] = "GIT_AUTHOR_NAME";
 187 static const char co_env[] = "GIT_COMMITTER_NAME";
 188 static const char *env_hint =
 189 "\n"
 190 "*** Your name cannot be determined from your system services (gecos).\n"
 191 "\n"
 192 "Run\n"
 193 "\n"
 194 "  git config user.email \"you@email.com\"\n"
 195 "  git config user.name \"Your Name\"\n"
 196 "\n"
 197 "To set the identity in this repository.\n"
 198 "Add --global to set your account\'s default\n"
 199 "\n";
 200
 201 const char *fmt_ident(const char *name, const char *email,
 202                       const char *date_str, int error_on_no_name)
 203 {
 204         static char buffer[1000];
 205         char date[50];
 206         int i;
 207
 208         setup_ident();
 209         if (!name)
 210                 name = git_default_name;
 211         if (!email)
 212                 email = git_default_email;
 213
 214         if (!*name) {
 215 #ifndef NO_ETC_PASSWD
 216                 struct passwd *pw;
 217 #endif
 218
 219                 if (0 <= error_on_no_name &&
 220                     name == git_default_name && env_hint) {
 221                         fprintf(stderr, env_hint, au_env, co_env);
 222                         env_hint = NULL; /* warn only once, for "git-var -l" */
 223                 }
 224                 if (0 < error_on_no_name)
 225                         die("empty ident %s <%s> not allowed", name, email);
 226 #ifndef NO_ETC_PASSWD
 227                 pw = getpwuid(getuid());
 228                 if (!pw)
 229                         die("You don't exist. Go away!");
 230                 strlcpy(git_default_name, pw->pw_name,
 231                         sizeof(git_default_name));
 232 #else
 233                 strlcpy(git_default_name, "unknown",
 234                         sizeof(git_default_name));
 235 #endif
 236                 name = git_default_name;
 237         }
 238
 239         strcpy(date, git_default_date);
 240         if (date_str)
 241                 parse_date(date_str, date, sizeof(date));
 242
 243         i = copy(buffer, sizeof(buffer), 0, name);
 244         i = add_raw(buffer, sizeof(buffer), i, " <");
 245         i = copy(buffer, sizeof(buffer), i, email);
 246         i = add_raw(buffer, sizeof(buffer), i, "> ");
 247         i = copy(buffer, sizeof(buffer), i, date);
 248         if (i >= sizeof(buffer))
 249                 die("Impossibly long personal identifier");
 250         buffer[i] = 0;
 251         return buffer;
 252 }
 253
 254 const char *git_author_info(int error_on_no_name)
 255 {
 256         return fmt_ident(getenv("GIT_AUTHOR_NAME"),
 257                          getenv("GIT_AUTHOR_EMAIL"),
 258                          getenv("GIT_AUTHOR_DATE"),
 259                          error_on_no_name);
 260 }
 261
 262 const char *git_committer_info(int error_on_no_name)
 263 {
 264         return fmt_ident(getenv("GIT_COMMITTER_NAME"),
 265                          getenv("GIT_COMMITTER_EMAIL"),
 266                          getenv("GIT_COMMITTER_DATE"),
 267                          error_on_no_name);
 268 }