tests/int/kill: add kill -a with host pidns test

This is roughly the same as TestPIDHostInitProcessWait in libct/int,
except that here we use separate processes to create and to kill a
container, so the processes inside a container are not children of "runc kill", and
also we hit different codepaths (nonChildProcess.signal rather than
initProcess.signal).

One other thing is, rootless is also tested.

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

tests/integration/kill.bats

@@ -29,3 +29,51 @@ function teardown() {
 	runc delete test_busybox
 	[ "$status" -eq 0 ]
 }
+
+# This is roughly the same as TestPIDHostInitProcessWait in libcontainer/integration.
+@test "kill --all KILL [host pidns]" {
+	# kill -a currently requires cgroup freezer.
+	requires cgroups_freezer
+
+	update_config '	  .linux.namespaces -= [{"type": "pid"}]'
+	set_cgroups_path
+	if [ $EUID -ne 0 ]; then
+		# kill --all requires working cgroups.
+		requires rootless_cgroup
+		update_config '	  .mounts |= map((select(.type == "proc")
+					| .type = "none"
+					| .source = "/proc"
+					| .options = ["rbind", "nosuid", "nodev", "noexec"]
+				  ) // .)'
+	fi
+
+	runc run -d --console-socket "$CONSOLE_SOCKET" test_busybox
+	[ "$status" -eq 0 ]
+
+	# Start a few more processes.
+	for _ in 1 2 3 4 5; do
+		__runc exec -d test_busybox sleep 1h
+		[ "$status" -eq 0 ]
+	done
+
+	# Get the list of all container processes.
+	path=$(get_cgroup_path "pids")
+	pids=$(cat "$path"/cgroup.procs)
+	echo "pids: $pids"
+	# Sanity check -- make sure all processes exist.
+	for p in $pids; do
+		kill -0 "$p"
+	done
+
+	runc kill -a test_busybox KILL
+	[ "$status" -eq 0 ]
+	wait_for_container 10 1 test_busybox stopped
+
+	# Make sure all processes are gone.
+	pids=$(cat "$path"/cgroup.procs) || true # OK if cgroup is gone
+	echo "pids: $pids"
+	for p in $pids; do
+		run ! kill -0 "$p"
+		[[ "$output" = *"No such process" ]]
+	done
+}