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 #include <pwd.h>
  11 #include <netdb.h>
  12
  13 static char git_default_date[50];
  14
  15 static void copy_gecos(struct passwd *w, char *name, int sz)
  16 {
  17         char *src, *dst;
  18         int len, nlen;
  19
  20         nlen = strlen(w->pw_name);
  21
  22         /* Traditionally GECOS field had office phone numbers etc, separated
  23          * with commas.  Also & stands for capitalized form of the login name.
  24          */
  25
  26         for (len = 0, dst = name, src = w->pw_gecos; len < sz; src++) {
  27                 int ch = *src;
  28                 if (ch != '&') {
  29                         *dst++ = ch;
  30                         if (ch == 0 || ch == ',')
  31                                 break;
  32                         len++;
  33                         continue;
  34                 }
  35                 if (len + nlen < sz) {
  36                         /* Sorry, Mr. McDonald... */
  37                         *dst++ = toupper(*w->pw_name);
  38                         memcpy(dst, w->pw_name + 1, nlen - 1);
  39                         dst += nlen - 1;
  40                 }
  41         }
  42         if (len < sz)
  43                 name[len] = 0;
  44         else
  45                 die("Your parents must have hated you!");
  46
  47 }
  48
  49 int setup_ident(void)
  50 {
  51         int len;
  52         struct passwd *pw = getpwuid(getuid());
  53
  54         if (!pw)
  55                 die("You don't exist. Go away!");
  56
  57         /* Get the name ("gecos") */
  58         copy_gecos(pw, git_default_name, sizeof(git_default_name));
  59
  60         /* Make up a fake email address (name + '@' + hostname [+ '.' + domainname]) */
  61         len = strlen(pw->pw_name);
  62         if (len > sizeof(git_default_email)/2)
  63                 die("Your sysadmin must hate you!");
  64         memcpy(git_default_email, pw->pw_name, len);
  65         git_default_email[len++] = '@';
  66         gethostname(git_default_email + len, sizeof(git_default_email) - len);
  67         if (!strchr(git_default_email+len, '.')) {
  68                 struct hostent *he = gethostbyname(git_default_email + len);
  69                 char *domainname;
  70
  71                 len = strlen(git_default_email);
  72                 git_default_email[len++] = '.';
  73                 if (he && (domainname = strchr(he->h_name, '.')))
  74                         strncpy(git_default_email + len, domainname + 1, sizeof(git_default_email) - len);
  75                 else
  76                         strncpy(git_default_email + len, "(none)", sizeof(git_default_email) - len);
  77                 git_default_email[sizeof(git_default_email) - 1] = 0;
  78         }
  79         /* And set the default date */
  80         datestamp(git_default_date, sizeof(git_default_date));
  81         return 0;
  82 }
  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 static const char au_env[] = "GIT_AUTHOR_NAME";
 160 static const char co_env[] = "GIT_COMMITTER_NAME";
 161 static const char *env_hint =
 162 "\n*** Environment problem:\n"
 163 "*** Your name cannot be determined from your system services (gecos).\n"
 164 "*** You would need to set %s and %s\n"
 165 "*** environment variables; otherwise you won't be able to perform\n"
 166 "*** certain operations because of \"empty ident\" errors.\n"
 167 "*** Alternatively, you can use user.name configuration variable.\n\n";
 168
 169 static const char *get_ident(const char *name, const char *email,
 170                              const char *date_str, int error_on_no_name)
 171 {
 172         static char buffer[1000];
 173         char date[50];
 174         int i;
 175
 176         if (!name)
 177                 name = git_default_name;
 178         if (!email)
 179                 email = git_default_email;
 180
 181         if (!*name) {
 182                 if (name == git_default_name && env_hint) {
 183                         fprintf(stderr, env_hint, au_env, co_env);
 184                         env_hint = NULL; /* warn only once, for "git-var -l" */
 185                 }
 186                 if (error_on_no_name)
 187                         die("empty ident %s <%s> not allowed", name, email);
 188         }
 189
 190         strcpy(date, git_default_date);
 191         if (date_str)
 192                 parse_date(date_str, date, sizeof(date));
 193
 194         i = copy(buffer, sizeof(buffer), 0, name);
 195         i = add_raw(buffer, sizeof(buffer), i, " <");
 196         i = copy(buffer, sizeof(buffer), i, email);
 197         i = add_raw(buffer, sizeof(buffer), i, "> ");
 198         i = copy(buffer, sizeof(buffer), i, date);
 199         if (i >= sizeof(buffer))
 200                 die("Impossibly long personal identifier");
 201         buffer[i] = 0;
 202         return buffer;
 203 }
 204
 205 const char *git_author_info(int error_on_no_name)
 206 {
 207         return get_ident(getenv("GIT_AUTHOR_NAME"),
 208                          getenv("GIT_AUTHOR_EMAIL"),
 209                          getenv("GIT_AUTHOR_DATE"),
 210                          error_on_no_name);
 211 }
 212
 213 const char *git_committer_info(int error_on_no_name)
 214 {
 215         return get_ident(getenv("GIT_COMMITTER_NAME"),
 216                          getenv("GIT_COMMITTER_EMAIL"),
 217                          getenv("GIT_COMMITTER_DATE"),
 218                          error_on_no_name);
 219 }