btrfs-progs: tests: hide RST related mkfs tests behind experimental builds

Currently we unconditionally run mkfs/029 and mkfs/030 as we export
RST feature through mkfs.btrfs as supported features.

But considering the mkfs.btrfs features don't match kernel support (only
a BTRFS_DEBUG kernel can support that), we're going to hide RST behind
experimental builds.

In that case RST related tests cases also need to be behind experimental
builds as regular builds of mkfs.btrfs will no longer support RST
feature.

Introduce two helpers:

- _test_config()
  To verify if certain config is set to 1

- check_experimental_build()
  A wrapper of "_test_config EXPERIMENTAL", and skip the test if
  btrfs-progs has no experimental features.

So that test cases can be skipped for non-experimental builds.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

tests/common

@@ -6,6 +6,22 @@
 # Temporary array for building the final command, injecting arguments as needed
 declare -a cmd_array
 
+# Check if a given option in config.h is set to 1
+# $1: config option name
+_test_config()
+{
+	local feature="$1"
+
+	if [ ! -f "$TOP/include/config.h" ]; then
+		echo "include/config.h not exists"
+		exit 1
+	fi
+	if grep -q "$feature.*1" "${TOP}/include/config.h"; then
+		return 0
+	fi
+	return 1
+}
+
 # assert that argument is not empty and is an existing path (file or directory)
 _assert_path()
 {
@@ -376,6 +392,13 @@ run_mustfail_stdout()
 	fi
 }
 
+check_experimental_build()
+{
+	if ! _test_config "EXPERIMENTAL"; then
+		_not_run "This test requires experimental build"
+	fi
+}
+
 check_prereq()
 {
 	# Internal tools for testing, not shipped with the package

tests/mkfs-tests/029-raid-stripe-tree/test.sh

@@ -3,6 +3,7 @@
 
 source "$TEST_TOP/common" || exit
 
+check_experimental_build
 check_prereq mkfs.btrfs
 check_prereq btrfs
 

tests/mkfs-tests/030-zoned-rst/test.sh

@@ -3,6 +3,7 @@
 
 source "$TEST_TOP/common" || exit
 
+check_experimental_build
 setup_root_helper
 setup_nullbdevs 4 128 4
 prepare_nullbdevs