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                 c == '\'';
 126 }
 127
 128 /*
 129  * Copy over a string to the destination, but avoid special
 130  * characters ('\n', '<' and '>') and remove crud at the end
 131  */
 132 static int copy(char *buf, size_t size, int offset, const char *src)
 133 {
 134         size_t i, len;
 135         unsigned char c;
 136
 137         /* Remove crud from the beginning.. */
 138         while ((c = *src) != 0) {
 139                 if (!crud(c))
 140                         break;
 141                 src++;
 142         }
 143
 144         /* Remove crud from the end.. */
 145         len = strlen(src);
 146         while (len > 0) {
 147                 c = src[len-1];
 148                 if (!crud(c))
 149                         break;
 150                 --len;
 151         }
 152
 153         /*
 154          * Copy the rest to the buffer, but avoid the special
 155          * characters '\n' '<' and '>' that act as delimiters on
 156          * an identification line
 157          */
 158         for (i = 0; i < len; i++) {
 159                 c = *src++;
 160                 switch (c) {
 161                 case '\n': case '<': case '>':
 162                         continue;
 163                 }
 164                 if (offset >= size)
 165                         return size;
 166                 buf[offset++] = c;
 167         }
 168         return offset;
 169 }
 170
 171 static const char *env_hint =
 172 "\n"
 173 "*** Please tell me who you are.\n"
 174 "\n"
 175 "Run\n"
 176 "\n"
 177 "  git config --global user.email \"you@example.com\"\n"
 178 "  git config --global user.name \"Your Name\"\n"
 179 "\n"
 180 "to set your account\'s default identity.\n"
 181 "Omit --global to set the identity only in this repository.\n"
 182 "\n";
 183
 184 const char *fmt_ident(const char *name, const char *email,
 185                       const char *date_str, int flag)
 186 {
 187         static char buffer[1000];
 188         char date[50];
 189         int i;
 190         int error_on_no_name = (flag & IDENT_ERROR_ON_NO_NAME);
 191         int warn_on_no_name = (flag & IDENT_WARN_ON_NO_NAME);
 192         int name_addr_only = (flag & IDENT_NO_DATE);
 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 ((warn_on_no_name || error_on_no_name) &&
 204                     name == git_default_name && env_hint) {
 205                         fprintf(stderr, env_hint);
 206                         env_hint = NULL; /* warn only once */
 207                 }
 208                 if (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_name(const char *name, const char *email)
 238 {
 239         return fmt_ident(name, email, NULL, IDENT_ERROR_ON_NO_NAME | IDENT_NO_DATE);
 240 }
 241
 242 const char *git_author_info(int flag)
 243 {
 244         return fmt_ident(getenv("GIT_AUTHOR_NAME"),
 245                          getenv("GIT_AUTHOR_EMAIL"),
 246                          getenv("GIT_AUTHOR_DATE"),
 247                          flag);
 248 }
 249
 250 const char *git_committer_info(int flag)
 251 {
 252         if (getenv("GIT_COMMITTER_NAME") &&
 253             getenv("GIT_COMMITTER_EMAIL"))
 254                 user_ident_explicitly_given = 1;
 255         return fmt_ident(getenv("GIT_COMMITTER_NAME"),
 256                          getenv("GIT_COMMITTER_EMAIL"),
 257                          getenv("GIT_COMMITTER_DATE"),
 258                          flag);
 259 }