/*

* ident.c

*

* create git identifier lines of the form "name <email> date"

*

* Copyright (C) 2005 Linus Torvalds

*/

#include "cache.h"

static struct strbuf git_default_name = STRBUF_INIT;

static struct strbuf git_default_email = STRBUF_INIT;

static struct strbuf git_default_date = STRBUF_INIT;

static int default_email_is_bogus;

static int default_name_is_bogus;

static int ident_use_config_only;

#define IDENT_NAME_GIVEN 01

#define IDENT_MAIL_GIVEN 02

#define IDENT_ALL_GIVEN (IDENT_NAME_GIVEN|IDENT_MAIL_GIVEN)

static int committer_ident_explicitly_given;

static int author_ident_explicitly_given;

static int ident_config_given;

#ifdef NO_GECOS_IN_PWENT

#define get_gecos(ignored) "&"

#else

#define get_gecos(struct_passwd) ((struct_passwd)->pw_gecos)

#endif

static struct passwd *xgetpwuid_self(int *is_bogus)

{

struct passwd *pw;

errno = 0;

pw = getpwuid(getuid());

if (!pw) {

static struct passwd fallback;

fallback.pw_name = "unknown";

#ifndef NO_GECOS_IN_PWENT

fallback.pw_gecos = "Unknown";

#endif

pw = &fallback;

if (is_bogus)

*is_bogus = 1;

}

return pw;

}

static void copy_gecos(const struct passwd *w, struct strbuf *name)

{

char *src;

/* Traditionally GECOS field had office phone numbers etc, separated

* with commas. Also & stands for capitalized form of the login name.

*/

for (src = get_gecos(w); *src && *src != ','; src++) {

int ch = *src;

if (ch != '&')

strbuf_addch(name, ch);

else {

/* Sorry, Mr. McDonald... */

strbuf_addch(name, toupper(*w->pw_name));

strbuf_addstr(name, w->pw_name + 1);

}

}

}

static int add_mailname_host(struct strbuf *buf)

{

FILE *mailname;

struct strbuf mailnamebuf = STRBUF_INIT;

mailname = fopen("/etc/mailname", "r");

if (!mailname) {

if (errno != ENOENT)

warning_errno("cannot open /etc/mailname");

return -1;

}

if (strbuf_getline(&mailnamebuf, mailname) == EOF) {

if (ferror(mailname))

warning_errno("cannot read /etc/mailname");

strbuf_release(&mailnamebuf);

fclose(mailname);

return -1;

}

/* success! */

strbuf_addbuf(buf, &mailnamebuf);

strbuf_release(&mailnamebuf);

fclose(mailname);

return 0;

}

static int canonical_name(const char *host, struct strbuf *out)

{

int status = -1;

#ifndef NO_IPV6

struct addrinfo hints, *ai;

memset (&hints, '\0', sizeof (hints));

hints.ai_flags = AI_CANONNAME;

if (!getaddrinfo(host, NULL, &hints, &ai)) {

if (ai && ai->ai_canonname && strchr(ai->ai_canonname, '.')) {

strbuf_addstr(out, ai->ai_canonname);

status = 0;

}

freeaddrinfo(ai);

}

#else

struct hostent *he = gethostbyname(host);

if (he && strchr(he->h_name, '.')) {

strbuf_addstr(out, he->h_name);

status = 0;

}

#endif /* NO_IPV6 */

return status;

}

static void add_domainname(struct strbuf *out, int *is_bogus)

{

char buf[1024];

if (gethostname(buf, sizeof(buf))) {

warning_errno("cannot get host name");

strbuf_addstr(out, "(none)");

*is_bogus = 1;

return;

}

if (strchr(buf, '.'))

strbuf_addstr(out, buf);

else if (canonical_name(buf, out) < 0) {

strbuf_addf(out, "%s.(none)", buf);

*is_bogus = 1;

}

}

static void copy_email(const struct passwd *pw, struct strbuf *email,

int *is_bogus)

{

/*

* Make up a fake email address

* (name + '@' + hostname [+ '.' + domainname])

*/

strbuf_addstr(email, pw->pw_name);

strbuf_addch(email, '@');

if (!add_mailname_host(email))

return; /* read from "/etc/mailname" (Debian) */

add_domainname(email, is_bogus);

}

const char *ident_default_name(void)

{

if (!git_default_name.len) {

copy_gecos(xgetpwuid_self(&default_name_is_bogus), &git_default_name);

strbuf_trim(&git_default_name);

}

return git_default_name.buf;

}

const char *ident_default_email(void)

{

if (!git_default_email.len) {

const char *email = getenv("EMAIL");

if (email && email[0]) {

strbuf_addstr(&git_default_email, email);

committer_ident_explicitly_given |= IDENT_MAIL_GIVEN;

author_ident_explicitly_given |= IDENT_MAIL_GIVEN;

} else

copy_email(xgetpwuid_self(&default_email_is_bogus),

&git_default_email, &default_email_is_bogus);

strbuf_trim(&git_default_email);

}

return git_default_email.buf;

}

static const char *ident_default_date(void)

{

if (!git_default_date.len)

datestamp(&git_default_date);

return git_default_date.buf;

}

void reset_ident_date(void)

{

strbuf_reset(&git_default_date);

}

static int crud(unsigned char c)

{

return c <= 32 ||

c == '.' ||

c == ',' ||

c == ':' ||

c == ';' ||

c == '<' ||

c == '>' ||

c == '"' ||

c == '\\' ||

c == '\'';

}

/*

* Copy over a string to the destination, but avoid special

* characters ('\n', '<' and '>') and remove crud at the end

*/

static void strbuf_addstr_without_crud(struct strbuf *sb, const char *src)

{

size_t i, len;

unsigned char c;

/* Remove crud from the beginning.. */

while ((c = *src) != 0) {

if (!crud(c))

break;

src++;

}

/* Remove crud from the end.. */

len = strlen(src);

while (len > 0) {

c = src[len-1];

if (!crud(c))

break;

--len;

}

/*

* Copy the rest to the buffer, but avoid the special

* characters '\n' '<' and '>' that act as delimiters on

* an identification line. We can only remove crud, never add it,

* so 'len' is our maximum.

*/

strbuf_grow(sb, len);

for (i = 0; i < len; i++) {

c = *src++;

switch (c) {

case '\n': case '<': case '>':

continue;

}

sb->buf[sb->len++] = c;

}

sb->buf[sb->len] = '\0';

}

/*

* Reverse of fmt_ident(); given an ident line, split the fields

* to allow the caller to parse it.

* Signal a success by returning 0, but date/tz fields of the result

* can still be NULL if the input line only has the name/email part

* (e.g. reading from a reflog entry).

*/

int split_ident_line(struct ident_split *split, const char *line, int len)

{

const char *cp;

size_t span;

int status = -1;

memset(split, 0, sizeof(*split));

split->name_begin = line;

for (cp = line; *cp && cp < line + len; cp++)

if (*cp == '<') {

split->mail_begin = cp + 1;

break;

}

if (!split->mail_begin)

return status;

for (cp = split->mail_begin - 2; line <= cp; cp--)

if (!isspace(*cp)) {

split->name_end = cp + 1;

break;

}

if (!split->name_end) {

/* no human readable name */

split->name_end = split->name_begin;

}

for (cp = split->mail_begin; cp < line + len; cp++)

if (*cp == '>') {

split->mail_end = cp;

break;

}

if (!split->mail_end)

return status;

/*

* Look from the end-of-line to find the trailing ">" of the mail

* address, even though we should already know it as split->mail_end.

* This can help in cases of broken idents with an extra ">" somewhere

* in the email address. Note that we are assuming the timestamp will

* never have a ">" in it.

*

* Note that we will always find some ">" before going off the front of

* the string, because will always hit the split->mail_end closing

* bracket.

*/

for (cp = line + len - 1; *cp != '>'; cp--)

;

for (cp = cp + 1; cp < line + len && isspace(*cp); cp++)

;

if (line + len <= cp)

goto person_only;

split->date_begin = cp;

span = strspn(cp, "0123456789");

if (!span)

goto person_only;

split->date_end = split->date_begin + span;

for (cp = split->date_end; cp < line + len && isspace(*cp); cp++)

;

if (line + len <= cp || (*cp != '+' && *cp != '-'))

goto person_only;

split->tz_begin = cp;

span = strspn(cp + 1, "0123456789");

if (!span)

goto person_only;

split->tz_end = split->tz_begin + 1 + span;

return 0;

person_only:

split->date_begin = NULL;

split->date_end = NULL;

split->tz_begin = NULL;

split->tz_end = NULL;

return 0;

}

static const char *env_hint =

N_("\n"

"*** Please tell me who you are.\n"

"\n"

"Run\n"

"\n"

" git config --global user.email \"you@example.com\"\n"

" git config --global user.name \"Your Name\"\n"

"\n"

"to set your account\'s default identity.\n"

"Omit --global to set the identity only in this repository.\n"

"\n");

const char *fmt_ident(const char *name, const char *email,

const char *date_str, int flag)

{

static struct strbuf ident = STRBUF_INIT;

int strict = (flag & IDENT_STRICT);

int want_date = !(flag & IDENT_NO_DATE);

int want_name = !(flag & IDENT_NO_NAME);

if (want_name) {

int using_default = 0;

if (!name) {

if (strict && ident_use_config_only

&& !(ident_config_given & IDENT_NAME_GIVEN)) {

fputs(_(env_hint), stderr);

die("no name was given and auto-detection is disabled");

}

name = ident_default_name();

using_default = 1;

if (strict && default_name_is_bogus) {

fputs(_(env_hint), stderr);

die("unable to auto-detect name (got '%s')", name);

}

}

if (!*name) {

struct passwd *pw;

if (strict) {

if (using_default)

fputs(_(env_hint), stderr);

die("empty ident name (for <%s>) not allowed", email);

}

pw = xgetpwuid_self(NULL);

name = pw->pw_name;

}

}

if (!email) {

if (strict && ident_use_config_only

&& !(ident_config_given & IDENT_MAIL_GIVEN)) {

fputs(_(env_hint), stderr);

die("no email was given and auto-detection is disabled");

}

email = ident_default_email();

if (strict && default_email_is_bogus) {

fputs(_(env_hint), stderr);

die("unable to auto-detect email address (got '%s')", email);

}

}

strbuf_reset(&ident);

if (want_name) {

strbuf_addstr_without_crud(&ident, name);

strbuf_addstr(&ident, " <");

}

strbuf_addstr_without_crud(&ident, email);

if (want_name)

strbuf_addch(&ident, '>');

if (want_date) {

strbuf_addch(&ident, ' ');

if (date_str && date_str[0]) {

if (parse_date(date_str, &ident) < 0)

die("invalid date format: %s", date_str);

}

else

strbuf_addstr(&ident, ident_default_date());

}

return ident.buf;

}

const char *fmt_name(const char *name, const char *email)

{

return fmt_ident(name, email, NULL, IDENT_STRICT | IDENT_NO_DATE);

}

const char *git_author_info(int flag)

{

if (getenv("GIT_AUTHOR_NAME"))

author_ident_explicitly_given |= IDENT_NAME_GIVEN;

if (getenv("GIT_AUTHOR_EMAIL"))

author_ident_explicitly_given |= IDENT_MAIL_GIVEN;

return fmt_ident(getenv("GIT_AUTHOR_NAME"),

getenv("GIT_AUTHOR_EMAIL"),

getenv("GIT_AUTHOR_DATE"),

flag);

}

const char *git_committer_info(int flag)

{

if (getenv("GIT_COMMITTER_NAME"))

committer_ident_explicitly_given |= IDENT_NAME_GIVEN;

if (getenv("GIT_COMMITTER_EMAIL"))

committer_ident_explicitly_given |= IDENT_MAIL_GIVEN;

return fmt_ident(getenv("GIT_COMMITTER_NAME"),

getenv("GIT_COMMITTER_EMAIL"),

getenv("GIT_COMMITTER_DATE"),

flag);

}

static int ident_is_sufficient(int user_ident_explicitly_given)

{

#ifndef WINDOWS

return (user_ident_explicitly_given & IDENT_MAIL_GIVEN);

#else

return (user_ident_explicitly_given == IDENT_ALL_GIVEN);

#endif

}

int committer_ident_sufficiently_given(void)

{

return ident_is_sufficient(committer_ident_explicitly_given);

}

int author_ident_sufficiently_given(void)

{

return ident_is_sufficient(author_ident_explicitly_given);

}

int git_ident_config(const char *var, const char *value, void *data)

{

if (!strcmp(var, "user.useconfigonly")) {

ident_use_config_only = git_config_bool(var, value);

return 0;

}

if (!strcmp(var, "user.name")) {

if (!value)

return config_error_nonbool(var);

strbuf_reset(&git_default_name);

strbuf_addstr(&git_default_name, value);

committer_ident_explicitly_given |= IDENT_NAME_GIVEN;

author_ident_explicitly_given |= IDENT_NAME_GIVEN;

ident_config_given |= IDENT_NAME_GIVEN;

return 0;

}

if (!strcmp(var, "user.email")) {

if (!value)

return config_error_nonbool(var);

strbuf_reset(&git_default_email);

strbuf_addstr(&git_default_email, value);

committer_ident_explicitly_given |= IDENT_MAIL_GIVEN;

author_ident_explicitly_given |= IDENT_MAIL_GIVEN;

ident_config_given |= IDENT_MAIL_GIVEN;

return 0;

}

return 0;

}

static int buf_cmp(const char *a_begin, const char *a_end,

const char *b_begin, const char *b_end)

{

int a_len = a_end - a_begin;

int b_len = b_end - b_begin;

int min = a_len < b_len ? a_len : b_len;

int cmp;

cmp = memcmp(a_begin, b_begin, min);

if (cmp)

return cmp;

return a_len - b_len;

}

int ident_cmp(const struct ident_split *a,

const struct ident_split *b)

{

int cmp;

cmp = buf_cmp(a->mail_begin, a->mail_end,

b->mail_begin, b->mail_end);

if (cmp)

return cmp;

return buf_cmp(a->name_begin, a->name_end,

b->name_begin, b->name_end);

}