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