parted: change device manager check in ptest

t6001-psep should check for device manager the same way as
other ptests for parted -- look for an environment variable.

(From OE-Core rev: c724a2feaef9030718742c02cb7da5a976e6b6e4)

Signed-off-by: Joe Slater <joe.slater@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-extended/parted/files/dm_check.patch

@@ -0,0 +1,22 @@
+parted: change check for device-manager
+
+Other ptests use this method.
+
+Upstream-Status: Submitted [bug-parted@gnu.org]
+
+Signed-off-by: Joe Slater <joe.slater@windriver.com>
+
+
+--- a/tests/t6001-psep.sh
++++ b/tests/t6001-psep.sh
+@@ -19,7 +19,9 @@
+ . "${srcdir=.}/init.sh"; path_prepend_ ../parted
+ 
+ require_root_
+-(dmsetup --help) > /dev/null 2>&1 || skip_test_ "No dmsetup installed"
++
++test "x$ENABLE_DEVICE_MAPPER" = xyes \
++  || skip_ "no device-mapper support"
+ 
+ # Device maps names - should be random to not conflict with existing ones on
+ # the system

meta/recipes-extended/parted/parted_3.2.bb

@@ -18,6 +18,7 @@ SRC_URI = "${GNU_MIRROR}/parted/parted-${PV}.tar.xz \
            file://run-ptest \
            file://Makefile \
            file://0001-libparted-Use-read-only-when-probing-devices-on-linu.patch \
+           file://dm_check.patch \
 "
 
 SRC_URI[md5sum] = "0247b6a7b314f8edeb618159fa95f9cb"