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tag: v1.8.0.3
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/*
* 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 char git_default_date[50];
int user_ident_explicitly_given;

#ifdef NO_GECOS_IN_PWENT
#define get_gecos(ignored) "&"
#else
#define get_gecos(struct_passwd) ((struct_passwd)->pw_gecos)
#endif

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;

mailname = fopen("/etc/mailname", "r");
if (!mailname) {
if (errno != ENOENT)
warning("cannot open /etc/mailname: %s",
strerror(errno));
return -1;
}
if (strbuf_getline(buf, mailname, '\n') == EOF) {
if (ferror(mailname))
warning("cannot read /etc/mailname: %s",
strerror(errno));
fclose(mailname);
return -1;
}
/* success! */
fclose(mailname);
return 0;
}

static void add_domainname(struct strbuf *out)
{
char buf[1024];
struct hostent *he;

if (gethostname(buf, sizeof(buf))) {
warning("cannot get host name: %s", strerror(errno));
strbuf_addstr(out, "(none)");
return;
}
if (strchr(buf, '.'))
strbuf_addstr(out, buf);
else if ((he = gethostbyname(buf)) && strchr(he->h_name, '.'))
strbuf_addstr(out, he->h_name);
else
strbuf_addf(out, "%s.(none)", buf);
}

static void copy_email(const struct passwd *pw, struct strbuf *email)
{
/*
* 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);
}

static const char *ident_default_name(void)
{
if (!git_default_name.len) {
copy_gecos(xgetpwuid_self(), &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);
user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
} else
copy_email(xgetpwuid_self(), &git_default_email);
strbuf_trim(&git_default_email);
}
return git_default_email.buf;
}

static const char *ident_default_date(void)
{
if (!git_default_date[0])
datestamp(git_default_date, sizeof(git_default_date));
return 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;

for (cp = split->mail_end + 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"
"*** 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;
char date[50];
int strict = (flag & IDENT_STRICT);
int want_date = !(flag & IDENT_NO_DATE);
int want_name = !(flag & IDENT_NO_NAME);

if (want_name && !name)
name = ident_default_name();
if (!email)
email = ident_default_email();

if (want_name && !*name) {
struct passwd *pw;

if (strict) {
if (name == git_default_name.buf)
fputs(env_hint, stderr);
die("empty ident name (for <%s>) not allowed", email);
}
pw = xgetpwuid_self();
name = pw->pw_name;
}

if (strict && email == git_default_email.buf &&
strstr(email, "(none)")) {
fputs(env_hint, stderr);
die("unable to auto-detect email address (got '%s')", email);
}

if (want_date) {
if (date_str && date_str[0]) {
if (parse_date(date_str, date, sizeof(date)) < 0)
die("invalid date format: %s", date_str);
}
else
strcpy(date, ident_default_date());
}

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, ' ');
strbuf_addstr_without_crud(&ident, 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)
{
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"))
user_ident_explicitly_given |= IDENT_NAME_GIVEN;
if (getenv("GIT_COMMITTER_EMAIL"))
user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
return fmt_ident(getenv("GIT_COMMITTER_NAME"),
getenv("GIT_COMMITTER_EMAIL"),
getenv("GIT_COMMITTER_DATE"),
flag);
}

int user_ident_sufficiently_given(void)
{
#ifndef WINDOWS
return (user_ident_explicitly_given & IDENT_MAIL_GIVEN);
#else
return (user_ident_explicitly_given == IDENT_ALL_GIVEN);
#endif
}

int git_ident_config(const char *var, const char *value, void *data)
{
if (!strcmp(var, "user.name")) {
if (!value)
return config_error_nonbool(var);
strbuf_reset(&git_default_name);
strbuf_addstr(&git_default_name, value);
user_ident_explicitly_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);
user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
return 0;
}

return 0;
}
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