tests/int: rework/simplify setup and teardown

1. Get rid of fixed ROOT, *_BUNDLE, and CONSOLE_SOCKET dirs.
   Now they are temporary directories created in setup_bundle.

2. Automate containers cleanup: instead of having to specify all
   containers to be removed, list and destroy everything (which is
   now possible since every test case has its own unique root).

3. Randomize cgroup paths so two tests running in parallel won't
   use the same cgroup.

Now it's theoretically possible to execute tests in parallel.
Practically it's not possible yet because bats uses GNU parallel,
which do not provide a terminal for whatever it executes, and
many runc tests (all those that run containers with terminal:
true) needs a tty. This may possibly be addressed later.

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

tests/integration/README.md

@@ -61,15 +61,12 @@ load helpers
 
 # setup is called at the beginning of every test.
 function setup() {
-  # see functions teardown_hello and setup_hello in helpers.bash, used to
-  # create a pristine environment for running your tests
-  teardown_hello
   setup_hello
 }
 
 # teardown is called at the end of every test.
 function teardown() {
-  teardown_hello
+  teardown_bundle
 }
 
 @test "this is a simple test" {

tests/integration/cgroups.bats

@@ -3,15 +3,10 @@
 load helpers
 
 function teardown() {
-	teardown_running_container test_cgroups_kmem
-	teardown_running_container test_cgroups_permissions
-	teardown_running_container test_cgroups_group
-	teardown_running_container test_cgroups_unified
-	teardown_busybox
+	teardown_bundle
 }
 
 function setup() {
-	teardown
 	setup_busybox
 }
 

tests/integration/checkpoint.bats

@@ -6,13 +6,11 @@ function setup() {
 	# XXX: currently criu require root containers.
 	requires criu root
 
-	teardown_busybox
 	setup_busybox
 }
 
 function teardown() {
-	teardown_busybox
-	teardown_running_container test_busybox_restore
+	teardown_bundle
 }
 
 function setup_pipes() {

tests/integration/create.bats

@@ -3,12 +3,11 @@
 load helpers
 
 function setup() {
-	teardown_busybox
 	setup_busybox
 }
 
 function teardown() {
-	teardown_busybox
+	teardown_bundle
 }
 
 @test "runc create" {

tests/integration/cwd.bats

@@ -3,12 +3,11 @@
 load helpers
 
 function setup() {
-	teardown_busybox
 	setup_busybox
 }
 
 function teardown() {
-	teardown_busybox
+	teardown_bundle
 }
 
 # Test case for https://github.com/opencontainers/runc/pull/2086

tests/integration/debug.bats

@@ -3,12 +3,11 @@
 load helpers
 
 function setup() {
-	teardown_hello
 	setup_hello
 }
 
 function teardown() {
-	teardown_hello
+	teardown_bundle
 }
 
 @test "global --debug" {

tests/integration/delete.bats

@@ -3,13 +3,11 @@
 load helpers
 
 function setup() {
-	teardown_busybox
 	setup_busybox
 }
 
 function teardown() {
-	teardown_busybox
-	teardown_running_container testbusyboxdelete
+	teardown_bundle
 }
 
 @test "runc delete" {

tests/integration/dev.bats

@@ -3,13 +3,11 @@
 load helpers
 
 function setup() {
-	teardown_busybox
 	setup_busybox
 }
 
 function teardown() {
-	teardown_busybox
-	teardown_running_container test_dev
+	teardown_bundle
 }
 
 @test "runc run [redundant default /dev/tty]" {

tests/integration/events.bats

@@ -3,12 +3,11 @@
 load helpers
 
 function setup() {
-	teardown_busybox
 	setup_busybox
 }
 
 function teardown() {
-	teardown_busybox
+	teardown_bundle
 }
 
 @test "events --stats" {
@@ -48,7 +47,7 @@ function test_events() {
 	#    test_busybox container which causes the event logger to exit.
 	(
 		retry 10 "$retry_every" grep -q test_busybox events.log
-		teardown_running_container test_busybox
+		__runc delete -f test_busybox
 	) &
 	wait # for both subshells to finish
 

tests/integration/exec.bats

@@ -3,12 +3,11 @@
 load helpers
 
 function setup() {
-	teardown_busybox
 	setup_busybox
 }
 
 function teardown() {
-	teardown_busybox
+	teardown_bundle
 }
 
 @test "runc exec" {

tests/integration/helpers.bash

@@ -20,11 +20,6 @@ RECVTTY="${INTEGRATION_ROOT}/../../contrib/cmd/recvtty/recvtty"
 # Test data path.
 TESTDATA="${INTEGRATION_ROOT}/testdata"
 
-# Destinations for test containers.
-BUSYBOX_BUNDLE="$BATS_RUN_TMPDIR/busyboxtest"
-HELLO_BUNDLE="$BATS_RUN_TMPDIR/hello-world"
-DEBIAN_BUNDLE="$BATS_RUN_TMPDIR/debiantest"
-
 # CRIU PATH
 CRIU="$(which criu 2>/dev/null || true)"
 
@@ -34,12 +29,6 @@ KERNEL_MAJOR="${KERNEL_VERSION%%.*}"
 KERNEL_MINOR="${KERNEL_VERSION#$KERNEL_MAJOR.}"
 KERNEL_MINOR="${KERNEL_MINOR%%.*}"
 
-# Root state path.
-ROOT=$(mktemp -d "$BATS_RUN_TMPDIR/runc.XXXXXX")
-
-# Path to console socket.
-CONSOLE_SOCKET="$BATS_RUN_TMPDIR/console.sock"
-
 # Check if we're in rootless mode.
 ROOTLESS=$(id -u)
 
@@ -55,7 +44,7 @@ function runc() {
 
 # Raw wrapper for runc.
 function __runc() {
-	"$RUNC" ${RUNC_USE_SYSTEMD+--systemd-cgroup} --root "$ROOT" "$@"
+	"$RUNC" ${RUNC_USE_SYSTEMD+--systemd-cgroup} --root "$ROOT/state" "$@"
 }
 
 # Wrapper for runc spec, which takes only one argument (the bundle path).
@@ -123,18 +112,19 @@ function init_cgroup_paths() {
 	# init once
 	test -n "$CGROUP_UNIFIED" && return
 
+	local rnd="$RANDOM"
 	if [ -n "${RUNC_USE_SYSTEMD}" ]; then
-		SD_UNIT_NAME="runc-cgroups-integration-test.scope"
+		SD_UNIT_NAME="runc-cgroups-integration-test-${rnd}.scope"
 		if [ $(id -u) = "0" ]; then
 			REL_CGROUPS_PATH="/machine.slice/$SD_UNIT_NAME"
-			OCI_CGROUPS_PATH="machine.slice:runc-cgroups:integration-test"
+			OCI_CGROUPS_PATH="machine.slice:runc-cgroups:integration-test-${rnd}"
 		else
 			REL_CGROUPS_PATH="/user.slice/user-$(id -u).slice/user@$(id -u).service/machine.slice/$SD_UNIT_NAME"
 			# OCI path doesn't contain "/user.slice/user-$(id -u).slice/user@$(id -u).service/" prefix
-			OCI_CGROUPS_PATH="machine.slice:runc-cgroups:integration-test"
+			OCI_CGROUPS_PATH="machine.slice:runc-cgroups:integration-test-${rnd}"
 		fi
 	else
-		REL_CGROUPS_PATH="/runc-cgroups-integration-test/test-cgroup"
+		REL_CGROUPS_PATH="/runc-cgroups-integration-test/test-cgroup-${rnd}"
 		OCI_CGROUPS_PATH=$REL_CGROUPS_PATH
 	fi
 
@@ -428,68 +418,65 @@ function testcontainer() {
 }
 
 function setup_recvtty() {
+	[ -z "$ROOT" ] && return 1 # must not be called without ROOT set
+	local dir="$ROOT/tty"
+
+	mkdir $dir
+	export CONSOLE_SOCKET="$dir/sock"
+
 	# We need to start recvtty in the background, so we double fork in the shell.
-	("$RECVTTY" --pid-file "$BATS_RUN_TMPDIR/recvtty.pid" --mode null "$CONSOLE_SOCKET" &) &
+	("$RECVTTY" --pid-file "$dir/pid" --mode null "$CONSOLE_SOCKET" &) &
 }
 
 function teardown_recvtty() {
+	[ -z "$ROOT" ] && return 0 # nothing to teardown
+	local dir="$ROOT/tty"
+
 	# When we kill recvtty, the container will also be killed.
-	if [ -f "$BATS_RUN_TMPDIR/recvtty.pid" ]; then
-		kill -9 $(cat "$BATS_RUN_TMPDIR/recvtty.pid")
+	if [ -f "$dir/pid" ]; then
+		kill -9 $(cat "$dir/pid")
 	fi
 
 	# Clean up the files that might be left over.
-	rm -f "$BATS_RUN_TMPDIR/recvtty.pid"
-	rm -f "$CONSOLE_SOCKET"
+	rm -rf "$dir"
 }
 
 function setup_bundle() {
 	local image="$1"
-	local bundle="$2"
+
+	# Root for various container directories (state, tty, bundle).
+	export ROOT=$(mktemp -d "$BATS_RUN_TMPDIR/runc.XXXXXX")
+	mkdir -p "$ROOT/state" "$ROOT/bundle/rootfs"
 
 	setup_recvtty
-	mkdir -p "$bundle"/rootfs
-	cd "$bundle"
+	cd "$ROOT/bundle"
 
 	tar --exclude './dev/*' -C rootfs -xf "$image"
 
 	runc_spec
 }
 
 function setup_busybox() {
-	setup_bundle "$BUSYBOX_IMAGE" "$BUSYBOX_BUNDLE"
+	setup_bundle "$BUSYBOX_IMAGE"
 }
 
 function setup_hello() {
-	setup_bundle "$HELLO_IMAGE" "$HELLO_BUNDLE"
+	setup_bundle "$HELLO_IMAGE"
 	update_config '(.. | select(.? == "sh")) |= "/hello"'
 }
 
 function setup_debian() {
-	setup_bundle "$DEBIAN_IMAGE" "$DEBIAN_BUNDLE"
+	setup_bundle "$DEBIAN_IMAGE"
 }
 
-function teardown_running_container() {
-	__runc delete -f "$1"
-}
+function teardown_bundle() {
+	[ -z "$ROOT" ] && return 0 # nothing to teardown
 
-function teardown_busybox() {
 	cd "$INTEGRATION_ROOT"
 	teardown_recvtty
-	teardown_running_container test_busybox
-	rm -f -r "$BUSYBOX_BUNDLE"
-}
-
-function teardown_hello() {
-	cd "$INTEGRATION_ROOT"
-	teardown_recvtty
-	teardown_running_container test_hello
-	rm -f -r "$HELLO_BUNDLE"
-}
-
-function teardown_debian() {
-	cd "$INTEGRATION_ROOT"
-	teardown_recvtty
-	teardown_running_container test_debian
-	rm -f -r "$DEBIAN_BUNDLE"
+	local ct
+	for ct in $(__runc list -q); do
+		__runc delete -f "$ct"
+	done
+	rm -rf "$ROOT"
 }

tests/integration/hooks.bats

@@ -5,7 +5,6 @@ load helpers
 function setup() {
 	requires root no_systemd
 
-	teardown
 	setup_debian
 	# CR = CreateRuntime, CC = CreataContainer
 	HOOKLIBCR=librunc-hooks-create-runtime.so
@@ -19,7 +18,7 @@ function teardown() {
 		umount "$LIBPATH"/$HOOKLIBCC.1.0.0 &>/dev/null || true
 		rm -f $HOOKLIBCR.1.0.0 $HOOKLIBCC.1.0.0
 	fi
-	teardown_debian
+	teardown_bundle
 }
 
 @test "runc run (hooks library tests)" {

tests/integration/kill.bats

@@ -3,12 +3,11 @@
 load helpers
 
 function setup() {
-	teardown_busybox
 	setup_busybox
 }
 
 function teardown() {
-	teardown_busybox
+	teardown_bundle
 }
 
 @test "kill detached busybox" {

tests/integration/list.bats

@@ -3,20 +3,16 @@
 load helpers
 
 function setup() {
-	unset ALT_ROOT
-	teardown
 	setup_busybox
-	ALT_ROOT=$(mktemp -d "$BATS_RUN_TMPDIR/runc-2.XXXXXX")
+	ALT_ROOT="$ROOT/alt"
+	mkdir -p "$ALT_ROOT/state"
 }
 
 function teardown() {
 	if [ -n "$ALT_ROOT" ]; then
-		ROOT="$ALT_ROOT" teardown_running_container test_box1
-		ROOT="$ALT_ROOT" teardown_running_container test_box2
-		ROOT="$ALT_ROOT" teardown_running_container test_box3
-		rm -rf "$ALT_ROOT"
+		ROOT="$ALT_ROOT" teardown_bundle
 	fi
-	teardown_busybox
+	teardown_bundle
 }
 
 @test "list" {

tests/integration/mask.bats

@@ -3,7 +3,6 @@
 load helpers
 
 function setup() {
-	teardown_busybox
 	setup_busybox
 
 	# Create fake rootfs.
@@ -15,7 +14,7 @@ function setup() {
 }
 
 function teardown() {
-	teardown_busybox
+	teardown_bundle
 }
 
 @test "mask paths [file]" {

tests/integration/mounts.bats

@@ -3,12 +3,11 @@
 load helpers
 
 function setup() {
-	teardown_busybox
 	setup_busybox
 }
 
 function teardown() {
-	teardown_busybox
+	teardown_bundle
 }
 
 @test "runc run [bind mount]" {