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 #ifdef NO_GECOS_IN_PWENT
  13 #define get_gecos(ignored) "&"
  14 #else
  15 #define get_gecos(struct_passwd) ((struct_passwd)->pw_gecos)
  16 #endif
  17
  18 static void copy_gecos(const struct passwd *w, char *name, size_t sz)
  19 {
  20         char *src, *dst;
  21         size_t len, nlen;
  22
  23         nlen = strlen(w->pw_name);
  24
  25         /* Traditionally GECOS field had office phone numbers etc, separated
  26          * with commas.  Also & stands for capitalized form of the login name.
  27          */
  28
  29         for (len = 0, dst = name, src = get_gecos(w); len < sz; src++) {
  30                 int ch = *src;
  31                 if (ch != '&') {
  32                         *dst++ = ch;
  33                         if (ch == 0 || ch == ',')
  34                                 break;
  35                         len++;
  36                         continue;
  37                 }
  38                 if (len + nlen < sz) {
  39                         /* Sorry, Mr. McDonald... */
  40                         *dst++ = toupper(*w->pw_name);
  41                         memcpy(dst, w->pw_name + 1, nlen - 1);
  42                         dst += nlen - 1;
  43                         len += nlen;
  44                 }
  45         }
  46         if (len < sz)
  47                 name[len] = 0;
  48         else
  49                 die("Your parents must have hated you!");
  50
  51 }
  52
  53 static void copy_email(const struct passwd *pw)
  54 {
  55         /*
  56          * Make up a fake email address
  57          * (name + '@' + hostname [+ '.' + domainname])
  58          */
  59         size_t len = strlen(pw->pw_name);
  60         if (len > sizeof(git_default_email)/2)
  61                 die("Your sysadmin must hate you!");
  62         memcpy(git_default_email, pw->pw_name, len);
  63         git_default_email[len++] = '@';
  64         gethostname(git_default_email + len, sizeof(git_default_email) - len);
  65         if (!strchr(git_default_email+len, '.')) {
  66                 struct hostent *he = gethostbyname(git_default_email + len);
  67                 char *domainname;
  68
  69                 len = strlen(git_default_email);
  70                 git_default_email[len++] = '.';
  71                 if (he && (domainname = strchr(he->h_name, '.')))
  72                         strlcpy(git_default_email + len, domainname + 1,
  73                                 sizeof(git_default_email) - len);
  74                 else
  75                         strlcpy(git_default_email + len, "(none)",
  76                                 sizeof(git_default_email) - len);
  77         }
  78 }
  79
  80 static void setup_ident(void)
  81 {
  82         struct passwd *pw = NULL;
  83
  84         /* Get the name ("gecos") */
  85         if (!git_default_name[0]) {
  86                 pw = getpwuid(getuid());
  87                 if (!pw)
  88                         die("You don't exist. Go away!");
  89                 copy_gecos(pw, git_default_name, sizeof(git_default_name));
  90         }
  91
  92         if (!git_default_email[0]) {
  93                 const char *email = getenv("EMAIL");
  94
  95                 if (email && email[0]) {
  96                         strlcpy(git_default_email, email,
  97                                 sizeof(git_default_email));
  98                         user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
  99                 } else {
 100                         if (!pw)
 101                                 pw = getpwuid(getuid());
 102                         if (!pw)
 103                                 die("You don't exist. Go away!");
 104                         copy_email(pw);
 105                 }
 106         }
 107
 108         /* And set the default date */
 109         if (!git_default_date[0])
 110                 datestamp(git_default_date, sizeof(git_default_date));
 111 }
 112
 113 static int add_raw(char *buf, size_t size, int offset, const char *str)
 114 {
 115         size_t len = strlen(str);
 116         if (offset + len > size)
 117                 return size;
 118         memcpy(buf + offset, str, len);
 119         return offset + len;
 120 }
 121
 122 static int crud(unsigned char c)
 123 {
 124         return  c <= 32  ||
 125                 c == '.' ||
 126                 c == ',' ||
 127                 c == ':' ||
 128                 c == ';' ||
 129                 c == '<' ||
 130                 c == '>' ||
 131                 c == '"' ||
 132                 c == '\\' ||
 133                 c == '\'';
 134 }
 135
 136 /*
 137  * Copy over a string to the destination, but avoid special
 138  * characters ('\n', '<' and '>') and remove crud at the end
 139  */
 140 static int copy(char *buf, size_t size, int offset, const char *src)
 141 {
 142         size_t i, len;
 143         unsigned char c;
 144
 145         /* Remove crud from the beginning.. */
 146         while ((c = *src) != 0) {
 147                 if (!crud(c))
 148                         break;
 149                 src++;
 150         }
 151
 152         /* Remove crud from the end.. */
 153         len = strlen(src);
 154         while (len > 0) {
 155                 c = src[len-1];
 156                 if (!crud(c))
 157                         break;
 158                 --len;
 159         }
 160
 161         /*
 162          * Copy the rest to the buffer, but avoid the special
 163          * characters '\n' '<' and '>' that act as delimiters on
 164          * an identification line
 165          */
 166         for (i = 0; i < len; i++) {
 167                 c = *src++;
 168                 switch (c) {
 169                 case '\n': case '<': case '>':
 170                         continue;
 171                 }
 172                 if (offset >= size)
 173                         return size;
 174                 buf[offset++] = c;
 175         }
 176         return offset;
 177 }
 178
 179 static const char *env_hint =
 180 "\n"
 181 "*** Please tell me who you are.\n"
 182 "\n"
 183 "Run\n"
 184 "\n"
 185 "  git config --global user.email \"you@example.com\"\n"
 186 "  git config --global user.name \"Your Name\"\n"
 187 "\n"
 188 "to set your account\'s default identity.\n"
 189 "Omit --global to set the identity only in this repository.\n"
 190 "\n";
 191
 192 const char *fmt_ident(const char *name, const char *email,
 193                       const char *date_str, int flag)
 194 {
 195         static char buffer[1000];
 196         char date[50];
 197         int i;
 198         int error_on_no_name = (flag & IDENT_ERROR_ON_NO_NAME);
 199         int warn_on_no_name = (flag & IDENT_WARN_ON_NO_NAME);
 200         int name_addr_only = (flag & IDENT_NO_DATE);
 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 ((warn_on_no_name || error_on_no_name) &&
 212                     name == git_default_name && env_hint) {
 213                         fputs(env_hint, stderr);
 214                         env_hint = NULL; /* warn only once */
 215                 }
 216                 if (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 (!name_addr_only && date_str && date_str[0]) {
 228                 if (parse_date(date_str, date, sizeof(date)) < 0)
 229                         die("invalid date format: %s", date_str);
 230         }
 231
 232         i = copy(buffer, sizeof(buffer), 0, name);
 233         i = add_raw(buffer, sizeof(buffer), i, " <");
 234         i = copy(buffer, sizeof(buffer), i, email);
 235         if (!name_addr_only) {
 236                 i = add_raw(buffer, sizeof(buffer), i,  "> ");
 237                 i = copy(buffer, sizeof(buffer), i, date);
 238         } else {
 239                 i = add_raw(buffer, sizeof(buffer), i, ">");
 240         }
 241         if (i >= sizeof(buffer))
 242                 die("Impossibly long personal identifier");
 243         buffer[i] = 0;
 244         return buffer;
 245 }
 246
 247 const char *fmt_name(const char *name, const char *email)
 248 {
 249         return fmt_ident(name, email, NULL, IDENT_ERROR_ON_NO_NAME | IDENT_NO_DATE);
 250 }
 251
 252 const char *git_author_info(int flag)
 253 {
 254         return fmt_ident(getenv("GIT_AUTHOR_NAME"),
 255                          getenv("GIT_AUTHOR_EMAIL"),
 256                          getenv("GIT_AUTHOR_DATE"),
 257                          flag);
 258 }
 259
 260 const char *git_committer_info(int flag)
 261 {
 262         if (getenv("GIT_COMMITTER_NAME"))
 263                 user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 264         if (getenv("GIT_COMMITTER_EMAIL"))
 265                 user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 266         return fmt_ident(getenv("GIT_COMMITTER_NAME"),
 267                          getenv("GIT_COMMITTER_EMAIL"),
 268                          getenv("GIT_COMMITTER_DATE"),
 269                          flag);
 270 }
 271
 272 int user_ident_sufficiently_given(void)
 273 {
 274 #ifndef WINDOWS
 275         return (user_ident_explicitly_given & IDENT_MAIL_GIVEN);
 276 #else
 277         return (user_ident_explicitly_given == IDENT_ALL_GIVEN);
 278 #endif
 279 }