Bug#23023457 DEBIAN/UBUNTU PACKAGES FAIL TO INSTALL BECAUSE OF EMPTY CONFIG VALUES

Post-push fix:
The test was failing on Windows; Since the client no longer throws an error it would
go on to try to connect to the server, and on Windows the test doesn't set up a
server to listen on the default port.
Since the test only really needs to check that the client prints the warning and does
not throw an error, we change the test to run mysql --help instead of trying to
connect, passing stdout to a temporary file so only the warning is left.

Author: ltangvald

mysql-test/r/mysql.result

@@ -522,13 +522,10 @@ a
 2
 #
 # Bug #16102788: INDETERMINATE BEHAVIOR DUE TO EMPTY OPTION VALUES
+# Bug #23023457: DEBIAN/UBUNTU PACKAGES FAIL TO INSTALL BECAUSE OF EMPTY CONFIG VALUES
 #
 mysql: [Warning] mysql: Empty value for 'port' specified. Will throw an error in future versions
-1
-1
 mysql: [Warning] mysql: Empty value for 'port' specified. Will throw an error in future versions
-1
-1
 #
 # Bug #21464621: MYSQL CLI SHOULD SUGGEST CONNECT-EXPIRED-PASSWORD WHEN ERROR 1862 OCCURS
 #

mysql-test/t/mysql.test

@@ -632,14 +632,21 @@ EOF
 --remove_file $MYSQLTEST_VARDIR/tmp/WL6797_cleanup.sql
 
 
+# Specifying an empty port option should only give a warning in 5.7
+# We only need to check that the client accepts it, not actually connect,
+# so we use --help and pass stdout to a temporary file so only the warning
+# is left (and connecting was failing on Windows).
 --echo #
 --echo # Bug #16102788: INDETERMINATE BEHAVIOR DUE TO EMPTY OPTION VALUES
+--echo # Bug #23023457: DEBIAN/UBUNTU PACKAGES FAIL TO INSTALL BECAUSE OF EMPTY CONFIG VALUES
 --echo #
 --replace_regex /mysql: .Warning. [^ ]*: Empty value for 'port' specified. Will throw an error in future versions/mysql: [Warning] mysql: Empty value for 'port' specified. Will throw an error in future versions/
---exec $MYSQL --port= -e "SELECT 1" 2>&1
+--exec $MYSQL --port= --help 2>&1 > $MYSQLTEST_VARDIR/tmp/bug23023457.out
+--remove_file $MYSQLTEST_VARDIR/tmp/bug23023457.out
 
 --replace_regex /mysql: .Warning. [^ ]*: Empty value for 'port' specified. Will throw an error in future versions/mysql: [Warning] mysql: Empty value for 'port' specified. Will throw an error in future versions/
---exec $MYSQL -P "" -e "SELECT 1" 2>&1
+--exec $MYSQL -P "" --help 2>&1 > $MYSQLTEST_VARDIR/tmp/bug23023457.out
+--remove_file $MYSQLTEST_VARDIR/tmp/bug23023457.out
 
 --echo #
 --echo # Bug #21464621: MYSQL CLI SHOULD SUGGEST CONNECT-EXPIRED-PASSWORD WHEN ERROR 1862 OCCURS