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ident: do not retrieve default ident when unnecessary

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Avoid a getpwuid() call (which contacts the network if the password
database is not local), read of /etc/mailname, gethostname() call, and
reverse DNS lookup if the user has already chosen a name and email
through configuration, the environment, or the command line.

This should slightly speed up commands like "git commit".  More
importantly, it improves error reporting when computation of the
default ident string does not go smoothly.  For example, after
detecting a problem (e.g., "warning: cannot open /etc/mailname:
Permission denied") in retrieving the default committer identity:

	touch /etc/mailname;	# as root
	chmod -r /etc/mailname;	# as root
	git commit -m 'test commit'

you can squelch the warning while waiting for your sysadmin to fix the
permissions problem.

	echo '[user] email = me@example.com' >>~/.gitconfig

Inspired-by: Johannes Sixt <j6t@kdgb.org>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jonathan Nieder 2011-10-06 12:17:19 -05:00 committed by Junio C Hamano
parent 8a55caa8a3
commit d855e4d35d
1 changed files with 8 additions and 8 deletions
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16
ident.c
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@ -117,19 +117,21 @@ static void copy_email(const struct passwd *pw)
sizeof(git_default_email) - len);
}
static void setup_ident(void)
static void setup_ident(const char **name, const char **emailp)
{
struct passwd *pw = NULL;
/* Get the name ("gecos") */
if (!git_default_name[0]) {
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 (!git_default_email[0]) {
if (!*emailp && !git_default_email[0]) {
const char *email = getenv("EMAIL");
if (email && email[0]) {
@ -144,6 +146,8 @@ static void setup_ident(void)
copy_email(pw);
}
}
if (!*emailp)
*emailp = git_default_email;
/* And set the default date */
if (!git_default_date[0])
@ -239,11 +243,7 @@ const char *fmt_ident(const char *name, const char *email,
int warn_on_no_name = (flag & IDENT_WARN_ON_NO_NAME);
int name_addr_only = (flag & IDENT_NO_DATE);
setup_ident();
if (!name)
name = git_default_name;
if (!email)
email = git_default_email;
setup_ident(&name, &email);
if (!*name) {
struct passwd *pw;