tests/int: runc delete: fix flake, enable for rootless

The following failure was observed in CI (on centos-stream-8 in
integration-cgroup suite):

	not ok 42 runc delete
	 (from function `fail' in file tests/integration/helpers.bash, line 338,
	  in test file tests/integration/delete.bats, line 30)
	   `[ "$output" = "" ] || fail "cgroup not cleaned up correctly: $output"' failed
	....
	cgroup not cleaned up correctly: /sys/fs/cgroup/pids/system.slice/tmp-bats\x2drun\x2d68012-runc.IPOypI-state-testbusyboxdelete-runc.zriC8C.mount
	/sys/fs/cgroup/cpu,cpuacct/system.slice/tmp-bats\x2drun\x2d68012-runc.IPOypI-state-testbusyboxdelete-runc.zriC8C.mount
	...

Apparently, this is a cgroup systemd creates for a mount unit which
appears then runc does internal /proc/self/exe bind-mount. The test
case should not take it into account.

The second problem with this test is it does not check that cgroup
actually exists when the container is running (so checking that it
was removed after makes less sense). For example, in rootless mode
the cgroup might not have been created.

Fix the find arguments to look for a specific cgroup name, and add
a check that these arguments are correct (i.e. the cgroup is found
when the container is running).

Signed-off-by: Kir Kolyshkin <[email protected]>

tests/integration/delete.bats

@@ -11,10 +11,22 @@ function teardown() {
 }
 
 @test "runc delete" {
+	# Need a permission to create a cgroup.
+	# XXX(@kolyshkin): currently this test does not handle rootless when
+	# fs cgroup driver is used, because in this case cgroup (with a
+	# predefined name) is created by tests/rootless.sh, not by runc.
+	[[ "$ROOTLESS" -ne 0 ]] && requires systemd
+	set_resources_limit
+
 	runc run -d --console-socket "$CONSOLE_SOCKET" testbusyboxdelete
 	[ "$status" -eq 0 ]
 
 	testcontainer testbusyboxdelete running
+	# Ensure the find statement used later is correct.
+	output=$(find /sys/fs/cgroup -name testbusyboxdelete -o -name \*-testbusyboxdelete.scope)
+	if [ -z "$output" ]; then
+		fail "expected cgroup not found"
+	fi
 
 	runc kill testbusyboxdelete KILL
 	[ "$status" -eq 0 ]
@@ -26,7 +38,7 @@ function teardown() {
 	runc state testbusyboxdelete
 	[ "$status" -ne 0 ]
 
-	output=$(find /sys/fs/cgroup -wholename '*testbusyboxdelete*' -type d)
+	output=$(find /sys/fs/cgroup -name testbusyboxdelete -o -name \*-testbusyboxdelete.scope)
 	[ "$output" = "" ] || fail "cgroup not cleaned up correctly: $output"
 }