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tag: v1.7.8-rc4
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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 char git_default_date[50];

#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, char *name, size_t sz)
{
char *src, *dst;
size_t len, nlen;

nlen = strlen(w->pw_name);

/* Traditionally GECOS field had office phone numbers etc, separated
* with commas. Also & stands for capitalized form of the login name.
*/

for (len = 0, dst = name, src = get_gecos(w); len < sz; src++) {
int ch = *src;
if (ch != '&') {
*dst++ = ch;
if (ch == 0 || ch == ',')
break;
len++;
continue;
}
if (len + nlen < sz) {
/* Sorry, Mr. McDonald... */
*dst++ = toupper(*w->pw_name);
memcpy(dst, w->pw_name + 1, nlen - 1);
dst += nlen - 1;
len += nlen;
}
}
if (len < sz)
name[len] = 0;
else
die("Your parents must have hated you!");

}

static int add_mailname_host(char *buf, size_t len)
{
FILE *mailname;

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

static void add_domainname(char *buf, size_t len)
{
struct hostent *he;
size_t namelen;
const char *domainname;

if (gethostname(buf, len)) {
warning("cannot get host name: %s", strerror(errno));
strlcpy(buf, "(none)", len);
return;
}
namelen = strlen(buf);
if (memchr(buf, '.', namelen))
return;

he = gethostbyname(buf);
buf[namelen++] = '.';
buf += namelen;
len -= namelen;
if (he && (domainname = strchr(he->h_name, '.')))
strlcpy(buf, domainname + 1, len);
else
strlcpy(buf, "(none)", len);
}

static void copy_email(const struct passwd *pw)
{
/*
* Make up a fake email address
* (name + '@' + hostname [+ '.' + domainname])
*/
size_t len = strlen(pw->pw_name);
if (len > sizeof(git_default_email)/2)
die("Your sysadmin must hate you!");
memcpy(git_default_email, pw->pw_name, len);
git_default_email[len++] = '@';

if (!add_mailname_host(git_default_email + len,
sizeof(git_default_email) - len))
return; /* read from "/etc/mailname" (Debian) */
add_domainname(git_default_email + len,
sizeof(git_default_email) - len);
}

static void setup_ident(const char **name, const char **emailp)
{
struct passwd *pw = NULL;

/* Get the name ("gecos") */
if (!*name && !git_default_name[0]) {
pw = getpwuid(getuid());
if (!pw)
die("You don't exist. Go away!");
copy_gecos(pw, git_default_name, sizeof(git_default_name));
}
if (!*name)
*name = git_default_name;

if (!*emailp && !git_default_email[0]) {
const char *email = getenv("EMAIL");

if (email && email[0]) {
strlcpy(git_default_email, email,
sizeof(git_default_email));
user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
} else {
if (!pw)
pw = getpwuid(getuid());
if (!pw)
die("You don't exist. Go away!");
copy_email(pw);
}
}
if (!*emailp)
*emailp = git_default_email;

/* And set the default date */
if (!git_default_date[0])
datestamp(git_default_date, sizeof(git_default_date));
}

static int add_raw(char *buf, size_t size, int offset, const char *str)
{
size_t len = strlen(str);
if (offset + len > size)
return size;
memcpy(buf + offset, str, len);
return offset + len;
}

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 int copy(char *buf, size_t size, int offset, 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
*/
for (i = 0; i < len; i++) {
c = *src++;
switch (c) {
case '\n': case '<': case '>':
continue;
}
if (offset >= size)
return size;
buf[offset++] = c;
}
return offset;
}

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 char buffer[1000];
char date[50];
int i;
int error_on_no_name = (flag & IDENT_ERROR_ON_NO_NAME);
int warn_on_no_name = (flag & IDENT_WARN_ON_NO_NAME);
int name_addr_only = (flag & IDENT_NO_DATE);

setup_ident(&name, &email);

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

if ((warn_on_no_name || error_on_no_name) &&
name == git_default_name && env_hint) {
fputs(env_hint, stderr);
env_hint = NULL; /* warn only once */
}
if (error_on_no_name)
die("empty ident %s <%s> not allowed", name, email);
pw = getpwuid(getuid());
if (!pw)
die("You don't exist. Go away!");
strlcpy(git_default_name, pw->pw_name,
sizeof(git_default_name));
name = git_default_name;
}

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

i = copy(buffer, sizeof(buffer), 0, name);
i = add_raw(buffer, sizeof(buffer), i, " <");
i = copy(buffer, sizeof(buffer), i, email);
if (!name_addr_only) {
i = add_raw(buffer, sizeof(buffer), i, "> ");
i = copy(buffer, sizeof(buffer), i, date);
} else {
i = add_raw(buffer, sizeof(buffer), i, ">");
}
if (i >= sizeof(buffer))
die("Impossibly long personal identifier");
buffer[i] = 0;
return buffer;
}

const char *fmt_name(const char *name, const char *email)
{
return fmt_ident(name, email, NULL, IDENT_ERROR_ON_NO_NAME | 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
}
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