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 static const char au_env[] = "GIT_AUTHOR_NAME";
  50 static const char co_env[] = "GIT_COMMITTER_NAME";
  51 static const char env_hint[] =
  52 "\n*** Environment problem:\n"
  53 "*** Your name cannot be determined from your system services (gecos).\n"
  54 "*** You would need to set %s and %s\n"
  55 "*** environment variables; otherwise you won't be able to perform\n"
  56 "*** certain operations because of \"empty ident\" errors.\n\n";
  57
  58 int setup_ident(void)
  59 {
  60         int len;
  61         struct passwd *pw = getpwuid(getuid());
  62
  63         if (!pw)
  64                 die("You don't exist. Go away!");
  65
  66         /* Get the name ("gecos") */
  67         copy_gecos(pw, git_default_name, sizeof(git_default_name));
  68
  69         if (!*git_default_name) {
  70                 if (!getenv(au_env) || !getenv(co_env))
  71                         fprintf(stderr, env_hint, au_env, co_env);
  72         }
  73
  74         /* Make up a fake email address (name + '@' + hostname [+ '.' + domainname]) */
  75         len = strlen(pw->pw_name);
  76         if (len > sizeof(git_default_email)/2)
  77                 die("Your sysadmin must hate you!");
  78         memcpy(git_default_email, pw->pw_name, len);
  79         git_default_email[len++] = '@';
  80         gethostname(git_default_email + len, sizeof(git_default_email) - len);
  81         if (!strchr(git_default_email+len, '.')) {
  82                 struct hostent *he = gethostbyname(git_default_email + len);
  83                 char *domainname;
  84
  85                 len = strlen(git_default_email);
  86                 git_default_email[len++] = '.';
  87                 if (he && (domainname = strchr(he->h_name, '.')))
  88                         strncpy(git_default_email + len, domainname + 1, sizeof(git_default_email) - len);
  89                 else
  90                         strncpy(git_default_email + len, "(none)", sizeof(git_default_email) - len);
  91                 git_default_email[sizeof(git_default_email) - 1] = 0;
  92         }
  93         /* And set the default date */
  94         datestamp(git_default_date, sizeof(git_default_date));
  95         return 0;
  96 }
  97
  98 static int add_raw(char *buf, int size, int offset, const char *str)
  99 {
 100         int len = strlen(str);
 101         if (offset + len > size)
 102                 return size;
 103         memcpy(buf + offset, str, len);
 104         return offset + len;
 105 }
 106
 107 static int crud(unsigned char c)
 108 {
 109         static char crud_array[256];
 110         static int crud_array_initialized = 0;
 111
 112         if (!crud_array_initialized) {
 113                 int k;
 114
 115                 for (k = 0; k <= 31; ++k) crud_array[k] = 1;
 116                 crud_array[' '] = 1;
 117                 crud_array['.'] = 1;
 118                 crud_array[','] = 1;
 119                 crud_array[':'] = 1;
 120                 crud_array[';'] = 1;
 121                 crud_array['<'] = 1;
 122                 crud_array['>'] = 1;
 123                 crud_array['"'] = 1;
 124                 crud_array['\''] = 1;
 125                 crud_array_initialized = 1;
 126         }
 127         return crud_array[c];
 128 }
 129
 130 /*
 131  * Copy over a string to the destination, but avoid special
 132  * characters ('\n', '<' and '>') and remove crud at the end
 133  */
 134 static int copy(char *buf, int size, int offset, const char *src)
 135 {
 136         int i, len;
 137         unsigned char c;
 138
 139         /* Remove crud from the beginning.. */
 140         while ((c = *src) != 0) {
 141                 if (!crud(c))
 142                         break;
 143                 src++;
 144         }
 145
 146         /* Remove crud from the end.. */
 147         len = strlen(src);
 148         while (len > 0) {
 149                 c = src[len-1];
 150                 if (!crud(c))
 151                         break;
 152                 --len;
 153         }
 154
 155         /*
 156          * Copy the rest to the buffer, but avoid the special
 157          * characters '\n' '<' and '>' that act as delimiters on
 158          * a identification line
 159          */
 160         for (i = 0; i < len; i++) {
 161                 c = *src++;
 162                 switch (c) {
 163                 case '\n': case '<': case '>':
 164                         continue;
 165                 }
 166                 if (offset >= size)
 167                         return size;
 168                 buf[offset++] = c;
 169         }
 170         return offset;
 171 }
 172
 173 static const char *get_ident(const char *name, const char *email,
 174                              const char *date_str)
 175 {
 176         static char buffer[1000];
 177         char date[50];
 178         int i;
 179
 180         if (!name)
 181                 name = git_default_name;
 182         if (!email)
 183                 email = git_default_email;
 184
 185         if (!*name || !*email)
 186                 die("empty ident %s <%s> not allowed",
 187                     name, email);
 188
 189         strcpy(date, git_default_date);
 190         if (date_str)
 191                 parse_date(date_str, date, sizeof(date));
 192
 193         i = copy(buffer, sizeof(buffer), 0, name);
 194         i = add_raw(buffer, sizeof(buffer), i, " <");
 195         i = copy(buffer, sizeof(buffer), i, email);
 196         i = add_raw(buffer, sizeof(buffer), i, "> ");
 197         i = copy(buffer, sizeof(buffer), i, date);
 198         if (i >= sizeof(buffer))
 199                 die("Impossibly long personal identifier");
 200         buffer[i] = 0;
 201         return buffer;
 202 }
 203
 204 const char *git_author_info(void)
 205 {
 206         return get_ident(getenv("GIT_AUTHOR_NAME"),
 207                          getenv("GIT_AUTHOR_EMAIL"),
 208                          getenv("GIT_AUTHOR_DATE"));
 209 }
 210
 211 const char *git_committer_info(void)
 212 {
 213         return get_ident(getenv("GIT_COMMITTER_NAME"),
 214                          getenv("GIT_COMMITTER_EMAIL"),
 215                          getenv("GIT_COMMITTER_DATE"));
 216 }