From: Michal Nazarewicz <min...@mina86.com>

If smtp_user is provided but smtp_pass is not, instead of prompting
for password, make git-send-email use git credential command
instead.

Signed-off-by: Michal Nazarewicz <min...@mina86.com>
---
 Documentation/git-send-email.txt |  4 +--
 git-send-email.perl              | 59 +++++++++++++++++++++++-----------------
 2 files changed, 36 insertions(+), 27 deletions(-)

diff --git a/Documentation/git-send-email.txt b/Documentation/git-send-email.txt
index 44a1f7c..0cffef8 100644
--- a/Documentation/git-send-email.txt
+++ b/Documentation/git-send-email.txt
@@ -164,8 +164,8 @@ Sending
 Furthermore, passwords need not be specified in configuration files
 or on the command line. If a username has been specified (with
 '--smtp-user' or a 'sendemail.smtpuser'), but no password has been
-specified (with '--smtp-pass' or 'sendemail.smtppass'), then the
-user is prompted for a password while the input is masked for privacy.
+specified (with '--smtp-pass' or 'sendemail.smtppass'), then
+a password is obtained using 'git-credential'.
 
 --smtp-server=<host>::
        If set, specifies the outgoing SMTP server to use (e.g.
diff --git a/git-send-email.perl b/git-send-email.perl
index be809e5..76bbfc3 100755
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -1045,6 +1045,39 @@ sub maildomain {
        return maildomain_net() || maildomain_mta() || 'localhost.localdomain';
 }
 
+# Returns 1 if authentication succeeded or was not necessary
+# (smtp_user was not specified), and 0 otherwise.
+
+sub smtp_auth_maybe {
+       if (!defined $smtp_authuser || $auth) {
+               return 1;
+       }
+
+       # Workaround AUTH PLAIN/LOGIN interaction defect
+       # with Authen::SASL::Cyrus
+       eval {
+               require Authen::SASL;
+               Authen::SASL->import(qw(Perl));
+       };
+
+       # TODO: Authentication may fail not because credentials were
+       # invalid but due to other reasons, in which we should not
+       # reject credentials.
+       $auth = Git::credential({
+               'protocol' => 'smtp',
+               'host' => join(':', $smtp_server, $smtp_server_port),
+               'username' => $smtp_authuser,
+               # if there's no password, "git credential fill" will
+               # give us one, otherwise it'll just pass this one.
+               'password' => $smtp_authpass
+       }, sub {
+               my $cred = shift;
+               return !!$smtp->auth($cred->{'username'}, $cred->{'password'});
+       });
+
+       return $auth;
+}
+
 # Returns 1 if the message was sent, and 0 otherwise.
 # In actuality, the whole program dies when there
 # is an error sending a message.
@@ -1185,31 +1218,7 @@ X-Mailer: git-send-email $gitversion
                            defined $smtp_server_port ? " 
port=$smtp_server_port" : "";
                }
 
-               if (defined $smtp_authuser) {
-                       # Workaround AUTH PLAIN/LOGIN interaction defect
-                       # with Authen::SASL::Cyrus
-                       eval {
-                               require Authen::SASL;
-                               Authen::SASL->import(qw(Perl));
-                       };
-
-                       if (!defined $smtp_authpass) {
-
-                               system "stty -echo";
-
-                               do {
-                                       print "Password: ";
-                                       $_ = <STDIN>;
-                                       print "\n";
-                               } while (!defined $_);
-
-                               chomp($smtp_authpass = $_);
-
-                               system "stty echo";
-                       }
-
-                       $auth ||= $smtp->auth( $smtp_authuser, $smtp_authpass ) 
or die $smtp->message;
-               }
+               smtp_auth_maybe or die $smtp->message;
 
                $smtp->mail( $raw_from ) or die $smtp->message;
                $smtp->to( @recipients ) or die $smtp->message;
-- 
1.8.1.2.549.g4fa355e

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