support/testing/tests/fs: test OCI format

This patch adds runtime testing of the OCI archive created by the
sloci scripting. It launches a containerd instance, imports, and
runs the OCI container.

The existing QEMU AARCH64 kernel config was extended to enable common
options used by a container runtime (cgroup and overlayfs).

Signed-off-by: Matthew Weber <matthew.weber@collins.com>
[Arnout: adapt file name which is arm64 now; add to DEVELOPERS]
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

DEVELOPERS

@@ -1846,6 +1846,7 @@ F:	package/wpa_supplicant/
 F:	package/wireless_tools/
 F:	package/xen/
 F:	package/xml-security-c/
+F:	support/testing/tests/fs/test_oci.py
 F:	support/testing/tests/package/br2-external/openjdk/
 F:	support/testing/tests/package/test_openjdk.py
 F:	support/testing/tests/package/test_opkg/

board/qemu/aarch64-virt/linux.config

@@ -3,6 +3,11 @@ CONFIG_POSIX_MQUEUE=y
 CONFIG_NO_HZ_IDLE=y
 CONFIG_HIGH_RES_TIMERS=y
 CONFIG_TASKSTATS=y
+CONFIG_MEMCG=y
+CONFIG_BLK_CGROUP=y
+CONFIG_CPUSETS=y
+CONFIG_CGROUP_DEVICE=y
+CONFIG_CGROUP_CPUACCT=y
 CONFIG_SCHED_AUTOGROUP=y
 CONFIG_PROFILING=y
 CONFIG_ARCH_VEXPRESS=y
@@ -62,5 +67,6 @@ CONFIG_ARM_SMMU_V3=y
 CONFIG_EXT4_FS=y
 CONFIG_FUSE_FS=y
 CONFIG_VIRTIO_FS=y
+CONFIG_OVERLAY_FS=y
 CONFIG_TMPFS=y
 CONFIG_TMPFS_POSIX_ACL=y

support/testing/tests/fs/test_oci.py

@@ -0,0 +1,57 @@
+import os
+import shutil
+import infra.basetest
+
+
+class TestOci(infra.basetest.BRTest):
+    config = \
+        """
+        BR2_aarch64=y
+        BR2_TOOLCHAIN_EXTERNAL=y
+        BR2_LINUX_KERNEL=y
+        BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+        BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.10.61"
+        BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
+        BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/aarch64-virt/linux.config"
+        BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
+        BR2_PACKAGE_CGROUPFS_MOUNT=y
+        BR2_PACKAGE_CONTAINERD=y
+        BR2_TARGET_ROOTFS_EXT2=y
+        BR2_TARGET_ROOTFS_EXT2_SIZE="600M"
+        BR2_TARGET_ROOTFS_OCI=y
+        BR2_TARGET_ROOTFS_OCI_ENTRYPOINT="df"
+        BR2_TARGET_ROOTFS_OCI_ENTRYPOINT_ARGS="-h"
+        BR2_TARGET_ROOTFS_OCI_ARCHIVE=y
+        # BR2_TARGET_ROOTFS_TAR is not set
+        """
+
+    def login(self):
+        rootfs = os.path.join(self.builddir, "images", "rootfs.ext2")
+        kern = os.path.join(self.builddir, "images", "Image")
+        self.emulator.boot(arch="aarch64",
+                           kernel=kern,
+                           kernel_cmdline=["root=/dev/vda", "console=ttyAMA0"],
+                           options=["-M", "virt",
+                                    "-cpu", "cortex-a57",
+                                    "-m", "512M",
+                                    "-drive", "file={},format=raw,if=virtio".format(rootfs)])
+        self.emulator.login()
+
+    def place_test_oci(self):
+        shutil.copy(os.path.join(self.builddir, 'images', 'rootfs-oci-latest-arm64-linux.oci-image.tar'),
+                    os.path.join(self.builddir, 'target', 'oci.tar'))
+        # rebuild to make sure oci.tar ends up in rootfs.ext2
+        self.b.build()
+
+    def test_run(self):
+        self.place_test_oci()
+        self.login()
+
+        cmd = "containerd &"
+        self.assertRunOk(cmd)
+
+        cmd = "ctr image import --base-name buildroot-test /oci.tar"
+        self.assertRunOk(cmd, timeout=120)
+
+        cmd = "ctr run --rm --tty buildroot-test:latest v1"
+        self.assertRunOk(cmd, timeout=120)