Add test for cgroup memory.kmem.limit_in_bytes handling

Signed-off-by: Kenfe-Mickael Laventure <mickael.laventure@gmail.com>

tests/integration/cgroups.bats

@@ -0,0 +1,77 @@
+#!/usr/bin/env bats
+
+load helpers
+
+UPDATE_TEST_RUNC_ROOT="$BATS_TMPDIR/runc-cgroups-integration-test"
+
+CGROUP_MEMORY=""
+
+TEST_CGROUP_NAME="runc-cgroups-integration-test"
+
+function init_cgroup_path() {
+   base_path=$(grep "rw,"  /proc/self/mountinfo | grep -i -m 1 'MEMORY$' | cut -d ' ' -f 5)
+   CGROUP_MEMORY="${base_path}/${TEST_CGROUP_NAME}"
+}
+
+function teardown() {
+    rm -f $BATS_TMPDIR/runc-update-integration-test.json
+    teardown_running_container_inroot test_cgroups_kmem $UPDATE_TEST_RUNC_ROOT
+    teardown_busybox
+}
+
+function setup() {
+    teardown
+    setup_busybox
+
+    init_cgroup_path
+}
+
+function check_cgroup_value() {
+    cgroup=$1
+    source=$2
+    expected=$3
+
+    current=$(cat $cgroup/$source)
+    echo  $cgroup/$source
+    echo "current" $current "!?" "$expected"
+    [ "$current" -eq "$expected" ]
+}
+
+@test "cgroups-kernel-memory-initialized" {
+    # Add cgroup path
+    sed -i 's/\("linux": {\)/\1\n    "cgroupsPath": "runc-cgroups-integration-test",/'  ${BUSYBOX_BUNDLE}/config.json
+
+    # Set some initial known values
+    DATA=$(cat <<-EOF
+    "memory": {
+        "kernel": 16777216
+    },
+EOF
+    )
+    DATA=$(echo ${DATA} | sed 's/\n/\\n/g')
+    sed -i "s/\(\"resources\": {\)/\1\n${DATA}/" ${BUSYBOX_BUNDLE}/config.json
+
+    # start a detached busybox to work with
+    "$RUNC" --root $UPDATE_TEST_RUNC_ROOT start -d --console /dev/pts/ptmx test_cgroups_kmem
+    [ "$status" -eq 0 ]
+    wait_for_container_inroot 15 1 test_cgroups_kmem $UPDATE_TEST_RUNC_ROOT
+
+    # update kernel memory limit
+    "$RUNC" --root $UPDATE_TEST_RUNC_ROOT update test_cgroups_kmem --kernel-memory 50331648
+    [ "$status" -eq 0 ]
+    check_cgroup_value $CGROUP_MEMORY "memory.kmem.limit_in_bytes" 50331648
+}
+
+@test "cgroups-kernel-memory-uninitialized" {
+    # Add cgroup path
+    sed -i 's/\("linux": {\)/\1\n    "cgroupsPath": "runc-cgroups-integration-test",/'  ${BUSYBOX_BUNDLE}/config.json
+
+    # start a detached busybox to work with
+    run "$RUNC" --root $UPDATE_TEST_RUNC_ROOT start -d --console /dev/pts/ptmx test_cgroups_kmem
+    [ "$status" -eq 0 ]
+    wait_for_container_inroot 15 1 test_cgroups_kmem $UPDATE_TEST_RUNC_ROOT
+
+    # update kernel memory limit
+    run "$RUNC" --root $UPDATE_TEST_RUNC_ROOT update test_cgroups_kmem --kernel-memory 50331648
+    [ ! "$status" -eq 0 ]
+}