ktest.pl: Add MAIL_COMMAND option to define how to send email

Allow the user to override the default way to send email. This will allow
the user to add their own mailer and format for sending email.

Signed-off-by: Steven Rostedt (VMware) <[e-mail]>

tools/testing/ktest/ktest.pl

···
 my $mailto;
 my $mailer;
 my $mail_path;
+my $mail_command;
 my $email_on_error;
 my $email_when_finished;
 my $email_when_started;
···
     "MAILTO"			=> \$mailto,
     "MAILER"			=> \$mailer,
     "MAIL_PATH"			=> \$mail_path,
+    "MAIL_COMMAND"		=> \$mail_command,
     "EMAIL_ON_ERROR"		=> \$email_on_error,
     "EMAIL_WHEN_FINISHED"	=> \$email_when_finished,
     "EMAIL_WHEN_STARTED"	=> \$email_when_started,
···
     return eval_option($name, $option, $i);
 }
 
-sub _mailx_send {
-    my ($subject, $message) = @_;
-    run_command "$mail_path/$mailer -s \'$subject\' $mailto <<< \'$message\'";
-}
-
-sub _sendmail_send {
-    my ($subject, $message) = @_;
-    run_command "echo \'Subject: $subject\n\n$message\' | $mail_path/sendmail -t $mailto";
-}
-
 sub find_mailer {
     my ($mailer) = @_;
 
···
     return undef;
 }
 
+sub do_send_mail {
+    my ($subject, $message) = @_;
+
+    if (!defined($mail_path)) {
+	# find the mailer
+	$mail_path = find_mailer $mailer;
+	if (!defined($mail_path)) {
+	    die "\nCan not find $mailer in PATH\n";
+	}
+    }
+
+    if (!defined($mail_command)) {
+	if ($mailer eq "mail" || $mailer eq "mailx") {
+	    $mail_command = "\$MAIL_PATH/\$MAILER -s \'\$SUBJECT\' \$MAILTO <<< \'\$MESSAGE\'";
+	} elsif ($mailer eq "sendmail" ) {
+	    $mail_command =  "echo \'Subject: \$SUBJECT\n\n\$MESSAGE\' | \$MAIL_PATH/\$MAILER -t \$MAILTO";
+	} else {
+	    die "\nYour mailer: $mailer is not supported.\n";
+	}
+    }
+
+    $mail_command =~ s/\$MAILER/$mailer/g;
+    $mail_command =~ s/\$MAIL_PATH/$mail_path/g;
+    $mail_command =~ s/\$MAILTO/$mailto/g;
+    $mail_command =~ s/\$SUBJECT/$subject/g;
+    $mail_command =~ s/\$MESSAGE/$message/g;
+
+    run_command $mail_command;
+}
+
 sub send_email {
+
     if (defined($mailto)) {
 	if (!defined($mailer)) {
 	    doprint "No email sent: email or mailer not specified in config.\n";
 	    return;
 	}
-	if (!defined($mail_path)) {
-	    # find the mailer
-	    $mail_path = find_mailer $mailer;
-	    if (!defined($mail_path)) {
-		die "\nCan not find $mailer in PATH\n";
-	    }
-	}
-        if ($mailer eq "mail" || $mailer eq "mailx"){ _mailx_send(@_);}
-        elsif ($mailer eq "sendmail" ) { _sendmail_send(@_);}
-        else { die "\nYour mailer: $mailer is not supported.\n" }
+	do_send_mail @_;
     }
 }
 

tools/testing/ktest/sample.conf

···
 # (default: for sendmail "/usr/sbin/sendmail", otherwise equals ${MAILER})
 #MAIL_EXEC = /usr/sbin/sendmail
 #
+# The command used to send mail, which uses the above options
+# can be modified. By default if the mailer is "sendmail" then
+#  MAIL_COMMAND = echo \'Subject: $SUBJECT\n\n$MESSAGE\' | $MAIL_PATH/$MAILER -t $MAILTO
+# For mail or mailx:
+#  MAIL_COMMAND = "$MAIL_PATH/$MAILER -s \'$SUBJECT\' $MAILTO <<< \'$MESSAGE\'
+# ktest.pl will do the substitution for MAIL_PATH, MAILER, MAILTO at the time
+#    it sends the mail if "$FOO" format is used. If "${FOO}" format is used,
+#    then the substitutions will occur at the time the config file is read.
+#    But note, MAIL_PATH and MAILER require being set by the config file if
+#     ${MAIL_PATH} or ${MAILER} are used, but not if $MAIL_PATH or $MAILER are.
+#MAIL_COMMAND = echo \'Subject: $SUBJECT\n\n$MESSAGE\' | $MAIL_PATH/$MAILER -t $MAILTO
+#
 # Errors are defined as those would terminate the script
 # (default 1)
 #EMAIL_ON_ERROR = 1