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         return  c <= 32  ||
 117                 c == '.' ||
 118                 c == ',' ||
 119                 c == ':' ||
 120                 c == ';' ||
 121                 c == '<' ||
 122                 c == '>' ||
 123                 c == '"' ||
 124                 c == '\'';
 125 }
 126
 127 /*
 128  * Copy over a string to the destination, but avoid special
 129  * characters ('\n', '<' and '>') and remove crud at the end
 130  */
 131 static int copy(char *buf, size_t size, int offset, const char *src)
 132 {
 133         size_t i, len;
 134         unsigned char c;
 135
 136         /* Remove crud from the beginning.. */
 137         while ((c = *src) != 0) {
 138                 if (!crud(c))
 139                         break;
 140                 src++;
 141         }
 142
 143         /* Remove crud from the end.. */
 144         len = strlen(src);
 145         while (len > 0) {
 146                 c = src[len-1];
 147                 if (!crud(c))
 148                         break;
 149                 --len;
 150         }
 151
 152         /*
 153          * Copy the rest to the buffer, but avoid the special
 154          * characters '\n' '<' and '>' that act as delimiters on
 155          * a identification line
 156          */
 157         for (i = 0; i < len; i++) {
 158                 c = *src++;
 159                 switch (c) {
 160                 case '\n': case '<': case '>':
 161                         continue;
 162                 }
 163                 if (offset >= size)
 164                         return size;
 165                 buf[offset++] = c;
 166         }
 167         return offset;
 168 }
 169
 170 static const char au_env[] = "GIT_AUTHOR_NAME";
 171 static const char co_env[] = "GIT_COMMITTER_NAME";
 172 static const char *env_hint =
 173 "\n"
 174 "*** Your name cannot be determined from your system services (gecos).\n"
 175 "\n"
 176 "Run\n"
 177 "\n"
 178 "  git config --global user.email \"you@example.com\"\n"
 179 "  git config --global user.name \"Your Name\"\n"
 180 "\n"
 181 "to set your account\'s default identity.\n"
 182 "Omit --global to set the identity only in this repository.\n"
 183 "\n";
 184
 185 static const char *fmt_ident_1(const char *name, const char *email,
 186                                const char *date_str, int flag)
 187 {
 188         static char buffer[1000];
 189         char date[50];
 190         int i;
 191         int error_on_no_name = !!(flag & 01);
 192         int name_addr_only = !!(flag & 02);
 193
 194         setup_ident();
 195         if (!name)
 196                 name = git_default_name;
 197         if (!email)
 198                 email = git_default_email;
 199
 200         if (!*name) {
 201                 struct passwd *pw;
 202
 203                 if (0 <= error_on_no_name &&
 204                     name == git_default_name && env_hint) {
 205                         fprintf(stderr, env_hint, au_env, co_env);
 206                         env_hint = NULL; /* warn only once, for "git-var -l" */
 207                 }
 208                 if (0 < error_on_no_name)
 209                         die("empty ident %s <%s> not allowed", name, email);
 210                 pw = getpwuid(getuid());
 211                 if (!pw)
 212                         die("You don't exist. Go away!");
 213                 strlcpy(git_default_name, pw->pw_name,
 214                         sizeof(git_default_name));
 215                 name = git_default_name;
 216         }
 217
 218         strcpy(date, git_default_date);
 219         if (!name_addr_only && date_str)
 220                 parse_date(date_str, date, sizeof(date));
 221
 222         i = copy(buffer, sizeof(buffer), 0, name);
 223         i = add_raw(buffer, sizeof(buffer), i, " <");
 224         i = copy(buffer, sizeof(buffer), i, email);
 225         if (!name_addr_only) {
 226                 i = add_raw(buffer, sizeof(buffer), i,  "> ");
 227                 i = copy(buffer, sizeof(buffer), i, date);
 228         } else {
 229                 i = add_raw(buffer, sizeof(buffer), i, ">");
 230         }
 231         if (i >= sizeof(buffer))
 232                 die("Impossibly long personal identifier");
 233         buffer[i] = 0;
 234         return buffer;
 235 }
 236
 237 const char *fmt_ident(const char *name, const char *email,
 238                       const char *date_str, int error_on_no_name)
 239 {
 240         int flag = (error_on_no_name ? 01 : 0);
 241         return fmt_ident_1(name, email, date_str, flag);
 242 }
 243
 244 const char *fmt_name(const char *name, const char *email)
 245 {
 246         return fmt_ident_1(name, email, NULL, 03);
 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 }