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