ktest: Add IF and ELSE to config sections

Add IF keyword to sections within the config. Also added an ELSE
keyword that allows different config options to be set for a given
section.

For example:

TYPE := 1
STATUS := 0

DEFAULTS IF ${TYPE}
[...]
ELSE IF ${STATUS}
[...]
ELSE
[...]

The above will process the first section as $TYPE is true. If it
was false, it would process the last section as $STATUS is false.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

tools/testing/ktest/ktest.pl

@@ -361,6 +361,21 @@ sub set_variable {
     }
 }
 
+sub process_if {
+    my ($name, $value) = @_;
+
+    my $val = process_variables($value);
+
+    if ($val =~ /^\s*0\s*$/) {
+	return 0;
+    } elsif ($val =~ /^\s*\d+\s*$/) {
+	return 1;
+    }
+
+    die ("$name: $.: Undefined variable $val in if statement\n");
+    return 1;
+}
+
 sub read_config {
     my ($config) = @_;
 
@@ -376,6 +391,8 @@ sub read_config {
     my $skip = 0;
     my $rest;
     my $test_case = 0;
+    my $if = 0;
+    my $if_set = 0;
 
     while (<IN>) {
 
@@ -397,7 +414,7 @@ sub read_config {
 	    $default = 0;
 	    $repeat = 1;
 
-	    if ($rest =~ /\s+SKIP(.*)/) {
+	    if ($rest =~ /\s+SKIP\b(.*)/) {
 		$rest = $1;
 		$skip = 1;
 	    } else {
@@ -411,9 +428,16 @@ sub read_config {
 		$repeat_tests{"$test_num"} = $repeat;
 	    }
 
-	    if ($rest =~ /\s+SKIP(.*)/) {
-		$rest = $1;
-		$skip = 1;
+	    if ($rest =~ /\sIF\s+(\S*)(.*)/) {
+		$rest = $2;
+		if (process_if($name, $1)) {
+		    $if_set = 1;
+		} else {
+		    $skip = 1;
+		}
+		$if = 1;
+	    } else {
+		$if = 0;
 	    }
 
 	    if ($rest !~ /^\s*$/) {
@@ -437,10 +461,42 @@ sub read_config {
 		$skip = 0;
 	    }
 
+	    if ($rest =~ /\sIF\s+(\S*)(.*)/) {
+		$if = 1;
+		$rest = $2;
+		if (process_if($name, $1)) {
+		    $if_set = 1;
+		} else {
+		    $skip = 1;
+		}
+	    } else {
+		$if = 0;
+	    }
+
 	    if ($rest !~ /^\s*$/) {
 		die "$name: $.: Gargbage found after DEFAULTS\n$_";
 	    }
 
+	} elsif (/^\s*ELSE(.*)$/) {
+	    if (!$if) {
+		die "$name: $.: ELSE found with out matching IF section\n$_";
+	    }
+	    $rest = $1;
+	    if ($if_set) {
+		$skip = 1;
+	    } else {
+		$skip = 0;
+
+		if ($rest =~ /\sIF\s+(\S*)(.*)/) {
+		    # May be a ELSE IF section.
+		    if (!process_if($name, $1)) {
+			$skip = 1;
+		    }
+		} else {
+		    $if = 0;
+		}
+	    }
+
 	} elsif (/^\s*([A-Z_\[\]\d]+)\s*=\s*(.*?)\s*$/) {
 
 	    next if ($skip);

tools/testing/ktest/sample.conf

@@ -72,6 +72,44 @@
 # the same option name under the same test or as default
 # ktest will fail to execute, and no tests will run.
 #
+# Both TEST_START and DEFAULTS sections can also have the IF keyword
+# The value after the IF must evaluate into a 0 or non 0 positive
+# integer, and can use the config variables (explained below).
+#
+# DEFAULTS IF ${IS_X86_32}
+#
+# The above will process the DEFAULTS section if the config
+# variable IS_X86_32 evaluates to a non zero positive integer
+# otherwise if it evaluates to zero, it will act the same
+# as if the SKIP keyword was used.
+#
+# The ELSE keyword can be used directly after a section with
+# a IF statement.
+#
+# TEST_START IF ${RUN_NET_TESTS}
+# BUILD_TYPE = useconfig:${CONFIG_DIR}/config-network
+#
+# ELSE
+#
+# BUILD_TYPE = useconfig:${CONFIG_DIR}/config-normal
+#
+#
+# The ELSE keyword can also contain an IF statement to allow multiple
+# if then else sections. But all the sections must be either
+# DEFAULT or TEST_START, they can not be a mixture.
+#
+# TEST_START IF ${RUN_NET_TESTS}
+# BUILD_TYPE = useconfig:${CONFIG_DIR}/config-network
+#
+# ELSE IF ${RUN_DISK_TESTS}
+# BUILD_TYPE = useconfig:${CONFIG_DIR}/config-tests
+#
+# ELSE IF ${RUN_CPU_TESTS}
+# BUILD_TYPE = useconfig:${CONFIG_DIR}/config-cpu
+#
+# ELSE
+# BUILD_TYPE = useconfig:${CONFIG_DIR}/config-network
+#
 
 #### Config variables ####
 #