ident: do not retrieve default ident when unnecessary

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>

diff --git a/ident.c b/ident.c
index edb4314494c421278f5d69bf69df5f7efde8e68a..f619619b82379c2d205c7d7ea101049e373ab90a 100644 (file)
--- a/ident.c
+++ b/ident.c
@@ -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;