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 struct strbuf git_default_name = STRBUF_INIT;
  11static struct strbuf git_default_email = STRBUF_INIT;
  12static char git_default_date[50];
  13
  14#define IDENT_NAME_GIVEN 01
  15#define IDENT_MAIL_GIVEN 02
  16#define IDENT_ALL_GIVEN (IDENT_NAME_GIVEN|IDENT_MAIL_GIVEN)
  17static int committer_ident_explicitly_given;
  18static int author_ident_explicitly_given;
  19
  20#ifdef NO_GECOS_IN_PWENT
  21#define get_gecos(ignored) "&"
  22#else
  23#define get_gecos(struct_passwd) ((struct_passwd)->pw_gecos)
  24#endif
  25
  26static void copy_gecos(const struct passwd *w, struct strbuf *name)
  27{
  28        char *src;
  29
  30        /* Traditionally GECOS field had office phone numbers etc, separated
  31         * with commas.  Also & stands for capitalized form of the login name.
  32         */
  33
  34        for (src = get_gecos(w); *src && *src != ','; src++) {
  35                int ch = *src;
  36                if (ch != '&')
  37                        strbuf_addch(name, ch);
  38                else {
  39                        /* Sorry, Mr. McDonald... */
  40                        strbuf_addch(name, toupper(*w->pw_name));
  41                        strbuf_addstr(name, w->pw_name + 1);
  42                }
  43        }
  44}
  45
  46static int add_mailname_host(struct strbuf *buf)
  47{
  48        FILE *mailname;
  49        struct strbuf mailnamebuf = STRBUF_INIT;
  50
  51        mailname = fopen("/etc/mailname", "r");
  52        if (!mailname) {
  53                if (errno != ENOENT)
  54                        warning("cannot open /etc/mailname: %s",
  55                                strerror(errno));
  56                return -1;
  57        }
  58        if (strbuf_getline(&mailnamebuf, mailname, '\n') == EOF) {
  59                if (ferror(mailname))
  60                        warning("cannot read /etc/mailname: %s",
  61                                strerror(errno));
  62                strbuf_release(&mailnamebuf);
  63                fclose(mailname);
  64                return -1;
  65        }
  66        /* success! */
  67        strbuf_addbuf(buf, &mailnamebuf);
  68        strbuf_release(&mailnamebuf);
  69        fclose(mailname);
  70        return 0;
  71}
  72
  73static void add_domainname(struct strbuf *out)
  74{
  75        char buf[1024];
  76        struct hostent *he;
  77
  78        if (gethostname(buf, sizeof(buf))) {
  79                warning("cannot get host name: %s", strerror(errno));
  80                strbuf_addstr(out, "(none)");
  81                return;
  82        }
  83        if (strchr(buf, '.'))
  84                strbuf_addstr(out, buf);
  85        else if ((he = gethostbyname(buf)) && strchr(he->h_name, '.'))
  86                strbuf_addstr(out, he->h_name);
  87        else
  88                strbuf_addf(out, "%s.(none)", buf);
  89}
  90
  91static void copy_email(const struct passwd *pw, struct strbuf *email)
  92{
  93        /*
  94         * Make up a fake email address
  95         * (name + '@' + hostname [+ '.' + domainname])
  96         */
  97        strbuf_addstr(email, pw->pw_name);
  98        strbuf_addch(email, '@');
  99
 100        if (!add_mailname_host(email))
 101                return; /* read from "/etc/mailname" (Debian) */
 102        add_domainname(email);
 103}
 104
 105static const char *ident_default_name(void)
 106{
 107        if (!git_default_name.len) {
 108                copy_gecos(xgetpwuid_self(), &git_default_name);
 109                strbuf_trim(&git_default_name);
 110        }
 111        return git_default_name.buf;
 112}
 113
 114const char *ident_default_email(void)
 115{
 116        if (!git_default_email.len) {
 117                const char *email = getenv("EMAIL");
 118
 119                if (email && email[0]) {
 120                        strbuf_addstr(&git_default_email, email);
 121                        committer_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 122                        author_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 123                } else
 124                        copy_email(xgetpwuid_self(), &git_default_email);
 125                strbuf_trim(&git_default_email);
 126        }
 127        return git_default_email.buf;
 128}
 129
 130static const char *ident_default_date(void)
 131{
 132        if (!git_default_date[0])
 133                datestamp(git_default_date, sizeof(git_default_date));
 134        return git_default_date;
 135}
 136
 137static int crud(unsigned char c)
 138{
 139        return  c <= 32  ||
 140                c == '.' ||
 141                c == ',' ||
 142                c == ':' ||
 143                c == ';' ||
 144                c == '<' ||
 145                c == '>' ||
 146                c == '"' ||
 147                c == '\\' ||
 148                c == '\'';
 149}
 150
 151/*
 152 * Copy over a string to the destination, but avoid special
 153 * characters ('\n', '<' and '>') and remove crud at the end
 154 */
 155static void strbuf_addstr_without_crud(struct strbuf *sb, const char *src)
 156{
 157        size_t i, len;
 158        unsigned char c;
 159
 160        /* Remove crud from the beginning.. */
 161        while ((c = *src) != 0) {
 162                if (!crud(c))
 163                        break;
 164                src++;
 165        }
 166
 167        /* Remove crud from the end.. */
 168        len = strlen(src);
 169        while (len > 0) {
 170                c = src[len-1];
 171                if (!crud(c))
 172                        break;
 173                --len;
 174        }
 175
 176        /*
 177         * Copy the rest to the buffer, but avoid the special
 178         * characters '\n' '<' and '>' that act as delimiters on
 179         * an identification line. We can only remove crud, never add it,
 180         * so 'len' is our maximum.
 181         */
 182        strbuf_grow(sb, len);
 183        for (i = 0; i < len; i++) {
 184                c = *src++;
 185                switch (c) {
 186                case '\n': case '<': case '>':
 187                        continue;
 188                }
 189                sb->buf[sb->len++] = c;
 190        }
 191        sb->buf[sb->len] = '\0';
 192}
 193
 194/*
 195 * Reverse of fmt_ident(); given an ident line, split the fields
 196 * to allow the caller to parse it.
 197 * Signal a success by returning 0, but date/tz fields of the result
 198 * can still be NULL if the input line only has the name/email part
 199 * (e.g. reading from a reflog entry).
 200 */
 201int split_ident_line(struct ident_split *split, const char *line, int len)
 202{
 203        const char *cp;
 204        size_t span;
 205        int status = -1;
 206
 207        memset(split, 0, sizeof(*split));
 208
 209        split->name_begin = line;
 210        for (cp = line; *cp && cp < line + len; cp++)
 211                if (*cp == '<') {
 212                        split->mail_begin = cp + 1;
 213                        break;
 214                }
 215        if (!split->mail_begin)
 216                return status;
 217
 218        for (cp = split->mail_begin - 2; line <= cp; cp--)
 219                if (!isspace(*cp)) {
 220                        split->name_end = cp + 1;
 221                        break;
 222                }
 223        if (!split->name_end) {
 224                /* no human readable name */
 225                split->name_end = split->name_begin;
 226        }
 227
 228        for (cp = split->mail_begin; cp < line + len; cp++)
 229                if (*cp == '>') {
 230                        split->mail_end = cp;
 231                        break;
 232                }
 233        if (!split->mail_end)
 234                return status;
 235
 236        for (cp = split->mail_end + 1; cp < line + len && isspace(*cp); cp++)
 237                ;
 238        if (line + len <= cp)
 239                goto person_only;
 240        split->date_begin = cp;
 241        span = strspn(cp, "0123456789");
 242        if (!span)
 243                goto person_only;
 244        split->date_end = split->date_begin + span;
 245        for (cp = split->date_end; cp < line + len && isspace(*cp); cp++)
 246                ;
 247        if (line + len <= cp || (*cp != '+' && *cp != '-'))
 248                goto person_only;
 249        split->tz_begin = cp;
 250        span = strspn(cp + 1, "0123456789");
 251        if (!span)
 252                goto person_only;
 253        split->tz_end = split->tz_begin + 1 + span;
 254        return 0;
 255
 256person_only:
 257        split->date_begin = NULL;
 258        split->date_end = NULL;
 259        split->tz_begin = NULL;
 260        split->tz_end = NULL;
 261        return 0;
 262}
 263
 264static const char *env_hint =
 265"\n"
 266"*** Please tell me who you are.\n"
 267"\n"
 268"Run\n"
 269"\n"
 270"  git config --global user.email \"you@example.com\"\n"
 271"  git config --global user.name \"Your Name\"\n"
 272"\n"
 273"to set your account\'s default identity.\n"
 274"Omit --global to set the identity only in this repository.\n"
 275"\n";
 276
 277const char *fmt_ident(const char *name, const char *email,
 278                      const char *date_str, int flag)
 279{
 280        static struct strbuf ident = STRBUF_INIT;
 281        char date[50];
 282        int strict = (flag & IDENT_STRICT);
 283        int want_date = !(flag & IDENT_NO_DATE);
 284        int want_name = !(flag & IDENT_NO_NAME);
 285
 286        if (want_name && !name)
 287                name = ident_default_name();
 288        if (!email)
 289                email = ident_default_email();
 290
 291        if (want_name && !*name) {
 292                struct passwd *pw;
 293
 294                if (strict) {
 295                        if (name == git_default_name.buf)
 296                                fputs(env_hint, stderr);
 297                        die("empty ident name (for <%s>) not allowed", email);
 298                }
 299                pw = xgetpwuid_self();
 300                name = pw->pw_name;
 301        }
 302
 303        if (strict && email == git_default_email.buf &&
 304            strstr(email, "(none)")) {
 305                fputs(env_hint, stderr);
 306                die("unable to auto-detect email address (got '%s')", email);
 307        }
 308
 309        if (want_date) {
 310                if (date_str && date_str[0]) {
 311                        if (parse_date(date_str, date, sizeof(date)) < 0)
 312                                die("invalid date format: %s", date_str);
 313                }
 314                else
 315                        strcpy(date, ident_default_date());
 316        }
 317
 318        strbuf_reset(&ident);
 319        if (want_name) {
 320                strbuf_addstr_without_crud(&ident, name);
 321                strbuf_addstr(&ident, " <");
 322        }
 323        strbuf_addstr_without_crud(&ident, email);
 324        if (want_name)
 325                        strbuf_addch(&ident, '>');
 326        if (want_date) {
 327                strbuf_addch(&ident, ' ');
 328                strbuf_addstr_without_crud(&ident, date);
 329        }
 330        return ident.buf;
 331}
 332
 333const char *fmt_name(const char *name, const char *email)
 334{
 335        return fmt_ident(name, email, NULL, IDENT_STRICT | IDENT_NO_DATE);
 336}
 337
 338const char *git_author_info(int flag)
 339{
 340        if (getenv("GIT_AUTHOR_NAME"))
 341                author_ident_explicitly_given |= IDENT_NAME_GIVEN;
 342        if (getenv("GIT_AUTHOR_EMAIL"))
 343                author_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 344        return fmt_ident(getenv("GIT_AUTHOR_NAME"),
 345                         getenv("GIT_AUTHOR_EMAIL"),
 346                         getenv("GIT_AUTHOR_DATE"),
 347                         flag);
 348}
 349
 350const char *git_committer_info(int flag)
 351{
 352        if (getenv("GIT_COMMITTER_NAME"))
 353                committer_ident_explicitly_given |= IDENT_NAME_GIVEN;
 354        if (getenv("GIT_COMMITTER_EMAIL"))
 355                committer_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 356        return fmt_ident(getenv("GIT_COMMITTER_NAME"),
 357                         getenv("GIT_COMMITTER_EMAIL"),
 358                         getenv("GIT_COMMITTER_DATE"),
 359                         flag);
 360}
 361
 362static int ident_is_sufficient(int user_ident_explicitly_given)
 363{
 364#ifndef WINDOWS
 365        return (user_ident_explicitly_given & IDENT_MAIL_GIVEN);
 366#else
 367        return (user_ident_explicitly_given == IDENT_ALL_GIVEN);
 368#endif
 369}
 370
 371int committer_ident_sufficiently_given(void)
 372{
 373        return ident_is_sufficient(committer_ident_explicitly_given);
 374}
 375
 376int author_ident_sufficiently_given(void)
 377{
 378        return ident_is_sufficient(author_ident_explicitly_given);
 379}
 380
 381int git_ident_config(const char *var, const char *value, void *data)
 382{
 383        if (!strcmp(var, "user.name")) {
 384                if (!value)
 385                        return config_error_nonbool(var);
 386                strbuf_reset(&git_default_name);
 387                strbuf_addstr(&git_default_name, value);
 388                committer_ident_explicitly_given |= IDENT_NAME_GIVEN;
 389                author_ident_explicitly_given |= IDENT_NAME_GIVEN;
 390                return 0;
 391        }
 392
 393        if (!strcmp(var, "user.email")) {
 394                if (!value)
 395                        return config_error_nonbool(var);
 396                strbuf_reset(&git_default_email);
 397                strbuf_addstr(&git_default_email, value);
 398                committer_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 399                author_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 400                return 0;
 401        }
 402
 403        return 0;
 404}