Andrew's git - gitweb.git/blob

   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
  10static char git_default_date[50];
  11
  12static 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
  46static 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
  73static 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                        user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
  92                } else {
  93                        if (!pw)
  94                                pw = getpwuid(getuid());
  95                        if (!pw)
  96                                die("You don't exist. Go away!");
  97                        copy_email(pw);
  98                }
  99        }
 100
 101        /* And set the default date */
 102        if (!git_default_date[0])
 103                datestamp(git_default_date, sizeof(git_default_date));
 104}
 105
 106static int add_raw(char *buf, size_t size, int offset, const char *str)
 107{
 108        size_t len = strlen(str);
 109        if (offset + len > size)
 110                return size;
 111        memcpy(buf + offset, str, len);
 112        return offset + len;
 113}
 114
 115static int crud(unsigned char c)
 116{
 117        return  c <= 32  ||
 118                c == '.' ||
 119                c == ',' ||
 120                c == ':' ||
 121                c == ';' ||
 122                c == '<' ||
 123                c == '>' ||
 124                c == '"' ||
 125                c == '\\' ||
 126                c == '\'';
 127}
 128
 129/*
 130 * Copy over a string to the destination, but avoid special
 131 * characters ('\n', '<' and '>') and remove crud at the end
 132 */
 133static int copy(char *buf, size_t size, int offset, const char *src)
 134{
 135        size_t i, len;
 136        unsigned char c;
 137
 138        /* Remove crud from the beginning.. */
 139        while ((c = *src) != 0) {
 140                if (!crud(c))
 141                        break;
 142                src++;
 143        }
 144
 145        /* Remove crud from the end.. */
 146        len = strlen(src);
 147        while (len > 0) {
 148                c = src[len-1];
 149                if (!crud(c))
 150                        break;
 151                --len;
 152        }
 153
 154        /*
 155         * Copy the rest to the buffer, but avoid the special
 156         * characters '\n' '<' and '>' that act as delimiters on
 157         * an identification line
 158         */
 159        for (i = 0; i < len; i++) {
 160                c = *src++;
 161                switch (c) {
 162                case '\n': case '<': case '>':
 163                        continue;
 164                }
 165                if (offset >= size)
 166                        return size;
 167                buf[offset++] = c;
 168        }
 169        return offset;
 170}
 171
 172static const char *env_hint =
 173"\n"
 174"*** Please tell me who you are.\n"
 175"\n"
 176"Run\n"
 177"\n"
 178"  git config --global user.email \"you@example.com\"\n"
 179"  git config --global user.name \"Your Name\"\n"
 180"\n"
 181"to set your account\'s default identity.\n"
 182"Omit --global to set the identity only in this repository.\n"
 183"\n";
 184
 185const char *fmt_ident(const char *name, const char *email,
 186                      const char *date_str, int flag)
 187{
 188        static char buffer[1000];
 189        char date[50];
 190        int i;
 191        int error_on_no_name = (flag & IDENT_ERROR_ON_NO_NAME);
 192        int warn_on_no_name = (flag & IDENT_WARN_ON_NO_NAME);
 193        int name_addr_only = (flag & IDENT_NO_DATE);
 194
 195        setup_ident();
 196        if (!name)
 197                name = git_default_name;
 198        if (!email)
 199                email = git_default_email;
 200
 201        if (!*name) {
 202                struct passwd *pw;
 203
 204                if ((warn_on_no_name || error_on_no_name) &&
 205                    name == git_default_name && env_hint) {
 206                        fputs(env_hint, stderr);
 207                        env_hint = NULL; /* warn only once */
 208                }
 209                if (error_on_no_name)
 210                        die("empty ident %s <%s> not allowed", name, email);
 211                pw = getpwuid(getuid());
 212                if (!pw)
 213                        die("You don't exist. Go away!");
 214                strlcpy(git_default_name, pw->pw_name,
 215                        sizeof(git_default_name));
 216                name = git_default_name;
 217        }
 218
 219        strcpy(date, git_default_date);
 220        if (!name_addr_only && date_str && date_str[0]) {
 221                if (parse_date(date_str, date, sizeof(date)) < 0)
 222                        die("invalid date format: %s", date_str);
 223        }
 224
 225        i = copy(buffer, sizeof(buffer), 0, name);
 226        i = add_raw(buffer, sizeof(buffer), i, " <");
 227        i = copy(buffer, sizeof(buffer), i, email);
 228        if (!name_addr_only) {
 229                i = add_raw(buffer, sizeof(buffer), i,  "> ");
 230                i = copy(buffer, sizeof(buffer), i, date);
 231        } else {
 232                i = add_raw(buffer, sizeof(buffer), i, ">");
 233        }
 234        if (i >= sizeof(buffer))
 235                die("Impossibly long personal identifier");
 236        buffer[i] = 0;
 237        return buffer;
 238}
 239
 240const char *fmt_name(const char *name, const char *email)
 241{
 242        return fmt_ident(name, email, NULL, IDENT_ERROR_ON_NO_NAME | IDENT_NO_DATE);
 243}
 244
 245const char *git_author_info(int flag)
 246{
 247        return fmt_ident(getenv("GIT_AUTHOR_NAME"),
 248                         getenv("GIT_AUTHOR_EMAIL"),
 249                         getenv("GIT_AUTHOR_DATE"),
 250                         flag);
 251}
 252
 253const char *git_committer_info(int flag)
 254{
 255        if (getenv("GIT_COMMITTER_NAME"))
 256                user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 257        if (getenv("GIT_COMMITTER_EMAIL"))
 258                user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 259        return fmt_ident(getenv("GIT_COMMITTER_NAME"),
 260                         getenv("GIT_COMMITTER_EMAIL"),
 261                         getenv("GIT_COMMITTER_DATE"),
 262                         flag);
 263}
 264
 265int user_ident_sufficiently_given(void)
 266{
 267#ifndef WINDOWS
 268        return (user_ident_explicitly_given & IDENT_MAIL_GIVEN);
 269#else
 270        return (user_ident_explicitly_given == IDENT_ALL_GIVEN);
 271#endif
 272}