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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];
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 = w->pw_gecos; 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;
}
}
if (len < sz)
name[len] = 0;
else
die("Your parents must have hated you!");
}
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++] = '@';
gethostname(git_default_email + len, sizeof(git_default_email) - len);
if (!strchr(git_default_email+len, '.')) {
struct hostent *he = gethostbyname(git_default_email + len);
char *domainname;
len = strlen(git_default_email);
git_default_email[len++] = '.';
if (he && (domainname = strchr(he->h_name, '.')))
strlcpy(git_default_email + len, domainname + 1,
sizeof(git_default_email) - len);
else
strlcpy(git_default_email + len, "(none)",
sizeof(git_default_email) - len);
}
}
static void setup_ident(void)
{
struct passwd *pw = NULL;
/* Get the name ("gecos") */
if (!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 (!git_default_email[0]) {
if (!pw)
pw = getpwuid(getuid());
if (!pw)
die("You don't exist. Go away!");
copy_email(pw);
}
/* 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)
{
static char crud_array[256];
static int crud_array_initialized = 0;
if (!crud_array_initialized) {
int k;
for (k = 0; k <= 31; ++k) crud_array[k] = 1;
crud_array[' '] = 1;
crud_array['.'] = 1;
crud_array[','] = 1;
crud_array[':'] = 1;
crud_array[';'] = 1;
crud_array['<'] = 1;
crud_array['>'] = 1;
crud_array['"'] = 1;
crud_array['\''] = 1;
crud_array_initialized = 1;
}
return crud_array[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
* a 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 au_env[] = "GIT_AUTHOR_NAME";
static const char co_env[] = "GIT_COMMITTER_NAME";
static const char *env_hint =
"\n"
"*** Your name cannot be determined from your system services (gecos).\n"
"\n"
"Run\n"
"\n"
" git config user.email \"you@email.com\"\n"
" git config user.name \"Your Name\"\n"
"\n"
"To set the identity in this repository.\n"
"Add --global to set your account\'s default\n"
"\n";
const char *fmt_ident(const char *name, const char *email,
const char *date_str, int error_on_no_name)
{
static char buffer[1000];
char date[50];
int i;
setup_ident();
if (!name)
name = git_default_name;
if (!email)
email = git_default_email;
if (!email)
email = getenv("EMAIL");
if (!*name) {
struct passwd *pw;
if (0 <= error_on_no_name &&
name == git_default_name && env_hint) {
fprintf(stderr, env_hint, au_env, co_env);
env_hint = NULL; /* warn only once, for "git-var -l" */
}
if (0 < 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 (date_str)
parse_date(date_str, date, sizeof(date));
i = copy(buffer, sizeof(buffer), 0, name);
i = add_raw(buffer, sizeof(buffer), i, " <");
i = copy(buffer, sizeof(buffer), i, email);
i = add_raw(buffer, sizeof(buffer), i, "> ");
i = copy(buffer, sizeof(buffer), i, date);
if (i >= sizeof(buffer))
die("Impossibly long personal identifier");
buffer[i] = 0;
return buffer;
}
const char *git_author_info(int error_on_no_name)
{
return fmt_ident(getenv("GIT_AUTHOR_NAME"),
getenv("GIT_AUTHOR_EMAIL"),
getenv("GIT_AUTHOR_DATE"),
error_on_no_name);
}
const char *git_committer_info(int error_on_no_name)
{
return fmt_ident(getenv("GIT_COMMITTER_NAME"),
getenv("GIT_COMMITTER_EMAIL"),
getenv("GIT_COMMITTER_DATE"),
error_on_no_name);
}
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