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 int setup_ident(void)
  49 {
  50         int len;
  51         struct passwd *pw = getpwuid(getuid());
  52
  53         if (!pw)
  54                 die("You don't exist. Go away!");
  55
  56         /* Get the name ("gecos") */
  57         copy_gecos(pw, git_default_name, sizeof(git_default_name));
  58
  59         /* Make up a fake email address (name + '@' + hostname [+ '.' + domainname]) */
  60         len = strlen(pw->pw_name);
  61         if (len > sizeof(git_default_email)/2)
  62                 die("Your sysadmin must hate you!");
  63         memcpy(git_default_email, pw->pw_name, len);
  64         git_default_email[len++] = '@';
  65         gethostname(git_default_email + len, sizeof(git_default_email) - len);
  66         if (!strchr(git_default_email+len, '.')) {
  67                 struct hostent *he = gethostbyname(git_default_email + len);
  68                 char *domainname;
  69
  70                 len = strlen(git_default_email);
  71                 git_default_email[len++] = '.';
  72                 if (he && (domainname = strchr(he->h_name, '.')))
  73                         strlcpy(git_default_email + len, domainname + 1, sizeof(git_default_email) - len);
  74                 else
  75                         strlcpy(git_default_email + len, "(none)", sizeof(git_default_email) - len);
  76         }
  77         /* And set the default date */
  78         datestamp(git_default_date, sizeof(git_default_date));
  79         return 0;
  80 }
  81
  82 #else /* NO_ETC_PASSWD */
  83
  84 static int add_raw(char *buf, int size, int offset, const char *str)
  85 {
  86         int len = strlen(str);
  87         if (offset + len > size)
  88                 return size;
  89         memcpy(buf + offset, str, len);
  90         return offset + len;
  91 }
  92
  93 static int crud(unsigned char c)
  94 {
  95         static char crud_array[256];
  96         static int crud_array_initialized = 0;
  97
  98         if (!crud_array_initialized) {
  99                 int k;
 100
 101                 for (k = 0; k <= 31; ++k) crud_array[k] = 1;
 102                 crud_array[' '] = 1;
 103                 crud_array['.'] = 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_initialized = 1;
 112         }
 113         return crud_array[c];
 114 }
 115
 116 /*
 117  * Copy over a string to the destination, but avoid special
 118  * characters ('\n', '<' and '>') and remove crud at the end
 119  */
 120 static int copy(char *buf, int size, int offset, const char *src)
 121 {
 122         int i, len;
 123         unsigned char c;
 124
 125         /* Remove crud from the beginning.. */
 126         while ((c = *src) != 0) {
 127                 if (!crud(c))
 128                         break;
 129                 src++;
 130         }
 131
 132         /* Remove crud from the end.. */
 133         len = strlen(src);
 134         while (len > 0) {
 135                 c = src[len-1];
 136                 if (!crud(c))
 137                         break;
 138                 --len;
 139         }
 140
 141         /*
 142          * Copy the rest to the buffer, but avoid the special
 143          * characters '\n' '<' and '>' that act as delimiters on
 144          * a identification line
 145          */
 146         for (i = 0; i < len; i++) {
 147                 c = *src++;
 148                 switch (c) {
 149                 case '\n': case '<': case '>':
 150                         continue;
 151                 }
 152                 if (offset >= size)
 153                         return size;
 154                 buf[offset++] = c;
 155         }
 156         return offset;
 157 }
 158
 159 int setup_ident(void)
 160 {
 161         return 0;
 162 }
 163
 164 #endif
 165
 166 static const char au_env[] = "GIT_AUTHOR_NAME";
 167 static const char co_env[] = "GIT_COMMITTER_NAME";
 168 static const char *env_hint =
 169 "\n"
 170 "*** Your name cannot be determined from your system services (gecos).\n"
 171 "\n"
 172 "Run\n"
 173 "\n"
 174 "  git repo-config user.email \"you@email.com\"\n"
 175 "  git repo-config user.name \"Your Name\"\n"
 176 "\n"
 177 "To set the identity in this repository.\n"
 178 "Add --global to set your account\'s default\n"
 179 "\n";
 180
 181 static const char *get_ident(const char *name, const char *email,
 182                              const char *date_str, int error_on_no_name)
 183 {
 184         static char buffer[1000];
 185         char date[50];
 186         int i;
 187
 188         if (!name)
 189                 name = git_default_name;
 190         if (!email)
 191                 email = git_default_email;
 192
 193         if (!*name) {
 194                 if (name == git_default_name && env_hint) {
 195                         fprintf(stderr, env_hint, au_env, co_env);
 196                         env_hint = NULL; /* warn only once, for "git-var -l" */
 197                 }
 198                 if (error_on_no_name)
 199                         die("empty ident %s <%s> not allowed", name, email);
 200         }
 201
 202         strcpy(date, git_default_date);
 203         if (date_str)
 204                 parse_date(date_str, date, sizeof(date));
 205
 206         i = copy(buffer, sizeof(buffer), 0, name);
 207         i = add_raw(buffer, sizeof(buffer), i, " <");
 208         i = copy(buffer, sizeof(buffer), i, email);
 209         i = add_raw(buffer, sizeof(buffer), i, "> ");
 210         i = copy(buffer, sizeof(buffer), i, date);
 211         if (i >= sizeof(buffer))
 212                 die("Impossibly long personal identifier");
 213         buffer[i] = 0;
 214         return buffer;
 215 }
 216
 217 const char *git_author_info(int error_on_no_name)
 218 {
 219         return get_ident(getenv("GIT_AUTHOR_NAME"),
 220                          getenv("GIT_AUTHOR_EMAIL"),
 221                          getenv("GIT_AUTHOR_DATE"),
 222                          error_on_no_name);
 223 }
 224
 225 const char *git_committer_info(int error_on_no_name)
 226 {
 227         return get_ident(getenv("GIT_COMMITTER_NAME"),
 228                          getenv("GIT_COMMITTER_EMAIL"),
 229                          getenv("GIT_COMMITTER_DATE"),
 230                          error_on_no_name);
 231 }
 232
 233 #ifndef NO_ETC_PASSWD
 234
 235 void ignore_missing_committer_name()
 236 {
 237         /* If we did not get a name from the user's gecos entry then
 238          * git_default_name is empty; so instead load the username
 239          * into it as a 'good enough for now' approximation of who
 240          * this user is.
 241          */
 242         if (!*git_default_name) {
 243                 struct passwd *pw = getpwuid(getuid());
 244                 if (!pw)
 245                         die("You don't exist. Go away!");
 246                 strlcpy(git_default_name, pw->pw_name, sizeof(git_default_name));
 247         }
 248 }
 249
 250 #else
 251
 252 void ignore_missing_committer_name()
 253 {
 254         strcpy(git_default_name, "unknown");
 255 }
 256
 257 #endif