tests/int/ps: enable for rootless

runc ps requires cgroup, but all the tests but one required root. Let's
fix this.

1. Add rootless cgroup requirement to setup() to avoid repetition.

2. Add set_cgroups_path to setup() for rootless containers because
   there is no default cgroup path.

3. Modify output checks to use $output rather than $lines because in case
   of rootless the first line of output contains the following warning:

> runc ps may fail if you don't have the full access to cgroups

4. While at it, move the common part of every test (creating the
   container and making sure it's running) to setup().

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

Author: kolyshkin

tests/integration/ps.bats

@@ -3,75 +3,44 @@
 load helpers
 
 function setup() {
+	# ps requires cgroups
+	[ $EUID -ne 0 ] && requires rootless_cgroup
+
 	setup_busybox
+
+	# Rootless does not have default cgroup path.
+	[ $EUID -ne 0 ] && set_cgroups_path
+
+	runc run -d --console-socket "$CONSOLE_SOCKET" test_busybox
+	[ "$status" -eq 0 ]
+	testcontainer test_busybox running
 }
 
 function teardown() {
 	teardown_bundle
 }
 
 @test "ps" {
-	# ps is not supported, it requires cgroups
-	requires root
-
-	# start busybox detached
-	runc run -d --console-socket "$CONSOLE_SOCKET" test_busybox
-	[ "$status" -eq 0 ]
-
-	# check state
-	testcontainer test_busybox running
-
 	runc ps test_busybox
 	[ "$status" -eq 0 ]
-	[[ ${lines[0]} =~ UID\ +PID\ +PPID\ +C\ +STIME\ +TTY\ +TIME\ +CMD+ ]]
-	[[ "${lines[1]}" == *"$(id -un 2>/dev/null)"*[0-9]* ]]
+	[[ "$output" =~ UID\ +PID\ +PPID\ +C\ +STIME\ +TTY\ +TIME\ +CMD+ ]]
+	[[ "$output" == *"$(id -un 2>/dev/null)"*[0-9]* ]]
 }
 
 @test "ps -f json" {
-	# ps is not supported, it requires cgroups
-	requires root
-
-	# start busybox detached
-	runc run -d --console-socket "$CONSOLE_SOCKET" test_busybox
-	[ "$status" -eq 0 ]
-
-	# check state
-	testcontainer test_busybox running
-
 	runc ps -f json test_busybox
 	[ "$status" -eq 0 ]
-	[[ ${lines[0]} =~ [0-9]+ ]]
+	[[ "$output" =~ [0-9]+ ]]
 }
 
 @test "ps -e -x" {
-	# ps is not supported, it requires cgroups
-	requires root
-
-	# start busybox detached
-	runc run -d --console-socket "$CONSOLE_SOCKET" test_busybox
-	[ "$status" -eq 0 ]
-
-	# check state
-	testcontainer test_busybox running
-
 	runc ps test_busybox -e -x
 	[ "$status" -eq 0 ]
-	[[ ${lines[0]} =~ \ +PID\ +TTY\ +STAT\ +TIME\ +COMMAND+ ]]
-	[[ "${lines[1]}" =~ [0-9]+ ]]
+	[[ "$output" =~ \ +PID\ +TTY\ +STAT\ +TIME\ +COMMAND+ ]]
+	[[ "$output" =~ [0-9]+ ]]
 }
 
 @test "ps after the container stopped" {
-	# ps requires cgroups
-	[ $EUID -ne 0 ] && requires rootless_cgroup
-	set_cgroups_path
-
-	# start busybox detached
-	runc run -d --console-socket "$CONSOLE_SOCKET" test_busybox
-	[ "$status" -eq 0 ]
-
-	# check state
-	testcontainer test_busybox running
-
 	runc ps test_busybox
 	[ "$status" -eq 0 ]