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(struct passwd *w, char *name, int sz)
  13 {
  14         char *src, *dst;
  15         int 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 int setup_ident(void)
  47 {
  48         int len;
  49         struct passwd *pw = getpwuid(getuid());
  50
  51         if (!pw)
  52                 die("You don't exist. Go away!");
  53
  54         /* Get the name ("gecos") */
  55         copy_gecos(pw, git_default_name, sizeof(git_default_name));
  56
  57         /* Make up a fake email address (name + '@' + hostname [+ '.' + domainname]) */
  58         len = strlen(pw->pw_name);
  59         if (len > sizeof(git_default_email)/2)
  60                 die("Your sysadmin must hate you!");
  61         memcpy(git_default_email, pw->pw_name, len);
  62         git_default_email[len++] = '@';
  63         gethostname(git_default_email + len, sizeof(git_default_email) - len);
  64         if (!strchr(git_default_email+len, '.')) {
  65                 struct hostent *he = gethostbyname(git_default_email + len);
  66                 char *domainname;
  67
  68                 len = strlen(git_default_email);
  69                 git_default_email[len++] = '.';
  70                 if (he && (domainname = strchr(he->h_name, '.')))
  71                         strlcpy(git_default_email + len, domainname + 1, sizeof(git_default_email) - len);
  72                 else
  73                         strlcpy(git_default_email + len, "(none)", sizeof(git_default_email) - len);
  74         }
  75         /* And set the default date */
  76         datestamp(git_default_date, sizeof(git_default_date));
  77         return 0;
  78 }
  79
  80 static int add_raw(char *buf, int size, int offset, const char *str)
  81 {
  82         int len = strlen(str);
  83         if (offset + len > size)
  84                 return size;
  85         memcpy(buf + offset, str, len);
  86         return offset + len;
  87 }
  88
  89 static int crud(unsigned char c)
  90 {
  91         static char crud_array[256];
  92         static int crud_array_initialized = 0;
  93
  94         if (!crud_array_initialized) {
  95                 int k;
  96
  97                 for (k = 0; k <= 31; ++k) crud_array[k] = 1;
  98                 crud_array[' '] = 1;
  99                 crud_array['.'] = 1;
 100                 crud_array[','] = 1;
 101                 crud_array[':'] = 1;
 102                 crud_array[';'] = 1;
 103                 crud_array['<'] = 1;
 104                 crud_array['>'] = 1;
 105                 crud_array['"'] = 1;
 106                 crud_array['\''] = 1;
 107                 crud_array_initialized = 1;
 108         }
 109         return crud_array[c];
 110 }
 111
 112 /*
 113  * Copy over a string to the destination, but avoid special
 114  * characters ('\n', '<' and '>') and remove crud at the end
 115  */
 116 static int copy(char *buf, int size, int offset, const char *src)
 117 {
 118         int i, len;
 119         unsigned char c;
 120
 121         /* Remove crud from the beginning.. */
 122         while ((c = *src) != 0) {
 123                 if (!crud(c))
 124                         break;
 125                 src++;
 126         }
 127
 128         /* Remove crud from the end.. */
 129         len = strlen(src);
 130         while (len > 0) {
 131                 c = src[len-1];
 132                 if (!crud(c))
 133                         break;
 134                 --len;
 135         }
 136
 137         /*
 138          * Copy the rest to the buffer, but avoid the special
 139          * characters '\n' '<' and '>' that act as delimiters on
 140          * a identification line
 141          */
 142         for (i = 0; i < len; i++) {
 143                 c = *src++;
 144                 switch (c) {
 145                 case '\n': case '<': case '>':
 146                         continue;
 147                 }
 148                 if (offset >= size)
 149                         return size;
 150                 buf[offset++] = c;
 151         }
 152         return offset;
 153 }
 154
 155 static const char au_env[] = "GIT_AUTHOR_NAME";
 156 static const char co_env[] = "GIT_COMMITTER_NAME";
 157 static const char *env_hint =
 158 "\n"
 159 "*** Your name cannot be determined from your system services (gecos).\n"
 160 "\n"
 161 "Run\n"
 162 "\n"
 163 "  git repo-config user.email \"you@email.com\"\n"
 164 "  git repo-config user.name \"Your Name\"\n"
 165 "\n"
 166 "To set the identity in this repository.\n"
 167 "Add --global to set your account\'s default\n"
 168 "\n";
 169
 170 static const char *get_ident(const char *name, const char *email,
 171                              const char *date_str, int error_on_no_name)
 172 {
 173         static char buffer[1000];
 174         char date[50];
 175         int i;
 176
 177         if (!name)
 178                 name = git_default_name;
 179         if (!email)
 180                 email = git_default_email;
 181
 182         if (!*name) {
 183                 if (name == git_default_name && env_hint) {
 184                         fprintf(stderr, env_hint, au_env, co_env);
 185                         env_hint = NULL; /* warn only once, for "git-var -l" */
 186                 }
 187                 if (error_on_no_name)
 188                         die("empty ident %s <%s> not allowed", name, email);
 189         }
 190
 191         strcpy(date, git_default_date);
 192         if (date_str)
 193                 parse_date(date_str, date, sizeof(date));
 194
 195         i = copy(buffer, sizeof(buffer), 0, name);
 196         i = add_raw(buffer, sizeof(buffer), i, " <");
 197         i = copy(buffer, sizeof(buffer), i, email);
 198         i = add_raw(buffer, sizeof(buffer), i, "> ");
 199         i = copy(buffer, sizeof(buffer), i, date);
 200         if (i >= sizeof(buffer))
 201                 die("Impossibly long personal identifier");
 202         buffer[i] = 0;
 203         return buffer;
 204 }
 205
 206 const char *git_author_info(int error_on_no_name)
 207 {
 208         return get_ident(getenv("GIT_AUTHOR_NAME"),
 209                          getenv("GIT_AUTHOR_EMAIL"),
 210                          getenv("GIT_AUTHOR_DATE"),
 211                          error_on_no_name);
 212 }
 213
 214 const char *git_committer_info(int error_on_no_name)
 215 {
 216         return get_ident(getenv("GIT_COMMITTER_NAME"),
 217                          getenv("GIT_COMMITTER_EMAIL"),
 218                          getenv("GIT_COMMITTER_DATE"),
 219                          error_on_no_name);
 220 }
 221
 222 void ignore_missing_committer_name()
 223 {
 224         /* If we did not get a name from the user's gecos entry then
 225          * git_default_name is empty; so instead load the username
 226          * into it as a 'good enough for now' approximation of who
 227          * this user is.
 228          */
 229         if (!*git_default_name) {
 230                 struct passwd *pw = getpwuid(getuid());
 231                 if (!pw)
 232                         die("You don't exist. Go away!");
 233                 strlcpy(git_default_name, pw->pw_name, sizeof(git_default_name));
 234         }
 235 }