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                 if (!pw)
  92                         pw = getpwuid(getuid());
  93                 if (!pw)
  94                         die("You don't exist. Go away!");
  95                 copy_email(pw);
  96         }
  97 #endif
  98
  99         /* And set the default date */
 100         if (!git_default_date[0])
 101                 datestamp(git_default_date, sizeof(git_default_date));
 102 }
 103
 104 static int add_raw(char *buf, size_t size, int offset, const char *str)
 105 {
 106         size_t len = strlen(str);
 107         if (offset + len > size)
 108                 return size;
 109         memcpy(buf + offset, str, len);
 110         return offset + len;
 111 }
 112
 113 static int crud(unsigned char c)
 114 {
 115         static char crud_array[256];
 116         static int crud_array_initialized = 0;
 117
 118         if (!crud_array_initialized) {
 119                 int k;
 120
 121                 for (k = 0; k <= 31; ++k) crud_array[k] = 1;
 122                 crud_array[' '] = 1;
 123                 crud_array['.'] = 1;
 124                 crud_array[','] = 1;
 125                 crud_array[':'] = 1;
 126                 crud_array[';'] = 1;
 127                 crud_array['<'] = 1;
 128                 crud_array['>'] = 1;
 129                 crud_array['"'] = 1;
 130                 crud_array['\''] = 1;
 131                 crud_array_initialized = 1;
 132         }
 133         return crud_array[c];
 134 }
 135
 136 /*
 137  * Copy over a string to the destination, but avoid special
 138  * characters ('\n', '<' and '>') and remove crud at the end
 139  */
 140 static int copy(char *buf, size_t size, int offset, const char *src)
 141 {
 142         size_t i, len;
 143         unsigned char c;
 144
 145         /* Remove crud from the beginning.. */
 146         while ((c = *src) != 0) {
 147                 if (!crud(c))
 148                         break;
 149                 src++;
 150         }
 151
 152         /* Remove crud from the end.. */
 153         len = strlen(src);
 154         while (len > 0) {
 155                 c = src[len-1];
 156                 if (!crud(c))
 157                         break;
 158                 --len;
 159         }
 160
 161         /*
 162          * Copy the rest to the buffer, but avoid the special
 163          * characters '\n' '<' and '>' that act as delimiters on
 164          * a identification line
 165          */
 166         for (i = 0; i < len; i++) {
 167                 c = *src++;
 168                 switch (c) {
 169                 case '\n': case '<': case '>':
 170                         continue;
 171                 }
 172                 if (offset >= size)
 173                         return size;
 174                 buf[offset++] = c;
 175         }
 176         return offset;
 177 }
 178
 179 static const char au_env[] = "GIT_AUTHOR_NAME";
 180 static const char co_env[] = "GIT_COMMITTER_NAME";
 181 static const char *env_hint =
 182 "\n"
 183 "*** Your name cannot be determined from your system services (gecos).\n"
 184 "\n"
 185 "Run\n"
 186 "\n"
 187 "  git config user.email \"you@email.com\"\n"
 188 "  git config user.name \"Your Name\"\n"
 189 "\n"
 190 "To set the identity in this repository.\n"
 191 "Add --global to set your account\'s default\n"
 192 "\n";
 193
 194 const char *fmt_ident(const char *name, const char *email,
 195                       const char *date_str, int error_on_no_name)
 196 {
 197         static char buffer[1000];
 198         char date[50];
 199         int i;
 200
 201         setup_ident();
 202         if (!name)
 203                 name = git_default_name;
 204         if (!email)
 205                 email = git_default_email;
 206         if (!email)
 207                 email = getenv("EMAIL");
 208
 209         if (!*name) {
 210 #ifndef NO_ETC_PASSWD
 211                 struct passwd *pw;
 212 #endif
 213
 214                 if (0 <= error_on_no_name &&
 215                     name == git_default_name && env_hint) {
 216                         fprintf(stderr, env_hint, au_env, co_env);
 217                         env_hint = NULL; /* warn only once, for "git-var -l" */
 218                 }
 219                 if (0 < error_on_no_name)
 220                         die("empty ident %s <%s> not allowed", name, email);
 221 #ifndef NO_ETC_PASSWD
 222                 pw = getpwuid(getuid());
 223                 if (!pw)
 224                         die("You don't exist. Go away!");
 225                 strlcpy(git_default_name, pw->pw_name,
 226                         sizeof(git_default_name));
 227 #else
 228                 strlcpy(git_default_name, "unknown",
 229                         sizeof(git_default_name));
 230 #endif
 231                 name = git_default_name;
 232         }
 233
 234         strcpy(date, git_default_date);
 235         if (date_str)
 236                 parse_date(date_str, date, sizeof(date));
 237
 238         i = copy(buffer, sizeof(buffer), 0, name);
 239         i = add_raw(buffer, sizeof(buffer), i, " <");
 240         i = copy(buffer, sizeof(buffer), i, email);
 241         i = add_raw(buffer, sizeof(buffer), i, "> ");
 242         i = copy(buffer, sizeof(buffer), i, date);
 243         if (i >= sizeof(buffer))
 244                 die("Impossibly long personal identifier");
 245         buffer[i] = 0;
 246         return buffer;
 247 }
 248
 249 const char *git_author_info(int error_on_no_name)
 250 {
 251         return fmt_ident(getenv("GIT_AUTHOR_NAME"),
 252                          getenv("GIT_AUTHOR_EMAIL"),
 253                          getenv("GIT_AUTHOR_DATE"),
 254                          error_on_no_name);
 255 }
 256
 257 const char *git_committer_info(int error_on_no_name)
 258 {
 259         return fmt_ident(getenv("GIT_COMMITTER_NAME"),
 260                          getenv("GIT_COMMITTER_EMAIL"),
 261                          getenv("GIT_COMMITTER_DATE"),
 262                          error_on_no_name);
 263 }