From: Vyacheslav Yurkov <v.yur...@precitec.de> Place a test file on the /etc by means of overlayfs-user recipe. Perform QA checks to make sure that: - When lower layer is exposed, that it's read-only to avoid undefined behavior - By default lower layer is not exposed
Signed-off-by: Vyacheslav Yurkov <v.yur...@precitec.de> --- .../overlayfs-user/overlayfs-user.bb | 7 +- meta/lib/oeqa/selftest/cases/overlayfs.py | 90 ++++++++++++++----- 2 files changed, 74 insertions(+), 23 deletions(-) diff --git a/meta-selftest/recipes-test/overlayfs-user/overlayfs-user.bb b/meta-selftest/recipes-test/overlayfs-user/overlayfs-user.bb index 913a4d1fdb..50cba9514b 100644 --- a/meta-selftest/recipes-test/overlayfs-user/overlayfs-user.bb +++ b/meta-selftest/recipes-test/overlayfs-user/overlayfs-user.bb @@ -12,6 +12,11 @@ OVERLAYFS_WRITABLE_PATHS[mnt-overlay] += "/usr/share/my-application" do_install() { install -d ${D}/usr/share/my-application + install -d ${D}${sysconfdir} + echo "Original file in /etc" >> ${D}${sysconfdir}/lower-layer-test.txt } -FILES:${PN} += "/usr" +FILES:${PN} += "\ + ${exec_prefix} \ + ${sysconfdir \ +" diff --git a/meta/lib/oeqa/selftest/cases/overlayfs.py b/meta/lib/oeqa/selftest/cases/overlayfs.py index f550015b4b..57a8c8bdb6 100644 --- a/meta/lib/oeqa/selftest/cases/overlayfs.py +++ b/meta/lib/oeqa/selftest/cases/overlayfs.py @@ -381,28 +381,7 @@ OVERLAYFS_ETC_DEVICE = "/dev/sda3" Author: Vyacheslav Yurkov <uvv.m...@gmail.com> """ - config = """ -DISTRO_FEATURES:append = " systemd" - -# Use systemd as init manager -VIRTUAL-RUNTIME_init_manager = "systemd" - -# enable overlayfs in the kernel -KERNEL_EXTRA_FEATURES:append = " features/overlayfs/overlayfs.scc" - -IMAGE_FSTYPES += "wic" -OVERLAYFS_INIT_OPTION = "{OVERLAYFS_INIT_OPTION}" -WKS_FILE = "overlayfs_etc.wks.in" - -EXTRA_IMAGE_FEATURES += "read-only-rootfs" -# Image configuration for overlayfs-etc -EXTRA_IMAGE_FEATURES += "overlayfs-etc" -IMAGE_FEATURES:remove = "package-management" -OVERLAYFS_ETC_MOUNT_POINT = "/data" -OVERLAYFS_ETC_FSTYPE = "ext4" -OVERLAYFS_ETC_DEVICE = "/dev/sda3" -OVERLAYFS_ETC_USE_ORIG_INIT_NAME = "{OVERLAYFS_ETC_USE_ORIG_INIT_NAME}" -""" + config = self.get_working_config() args = { 'OVERLAYFS_INIT_OPTION': "" if origInit else "init=/sbin/preinit", @@ -423,6 +402,11 @@ OVERLAYFS_ETC_USE_ORIG_INIT_NAME = "{OVERLAYFS_ETC_USE_ORIG_INIT_NAME}" line = getline_qemu(output, "upperdir=/data/overlay-etc/upper") self.assertTrue(line and line.startswith("/data/overlay-etc/upper on /etc type overlay"), msg=output) + # check that lower layer is not available + status, output = qemu.run_serial("ls -1 /data/overlay-etc/lower") + line = getline_qemu(output, "No such file or directory") + self.assertTrue(line, msg=output) + status, output = qemu.run_serial("touch " + testFile) status, output = qemu.run_serial("sync") status, output = qemu.run_serial("ls -1 " + testFile) @@ -434,3 +418,65 @@ OVERLAYFS_ETC_USE_ORIG_INIT_NAME = "{OVERLAYFS_ETC_USE_ORIG_INIT_NAME}" status, output = qemu.run_serial("ls -1 " + testFile) line = getline_qemu(output, testFile) self.assertTrue(line and line.startswith(testFile), msg=output) + + def test_lower_layer_access(self): + """ + Summary: Test that lower layer of /etc is available read-only when configured + Expected: Can't write to lower layer. The files on lower and upper different after + modification + Author: Vyacheslav Yurkov <uvv.m...@gmail.com> + """ + + config = self.get_working_config() + + configLower = """ +OVERLAYFS_ETC_EXPOSE_LOWER = "1" +IMAGE_INSTALL:append = " overlayfs-user" +""" + testFile = "lower-layer-test.txt" + + args = { + 'OVERLAYFS_INIT_OPTION': "", + 'OVERLAYFS_ETC_USE_ORIG_INIT_NAME': 1 + } + + self.write_config(config.format(**args)) + + self.append_config(configLower) + bitbake('core-image-minimal') + + with runqemu('core-image-minimal', image_fstype='wic') as qemu: + status, output = qemu.run_serial("echo \"Modified in upper\" > /etc/" + testFile) + status, output = qemu.run_serial("diff /etc/" + testFile + " /data/overlay-etc/lower/" + testFile) + line = getline_qemu(output, "Modified in upper") + self.assertTrue(line, msg=output) + line = getline_qemu(output, "Original file") + self.assertTrue(line, msg=output) + + status, output = qemu.run_serial("touch /data/overlay-etc/lower/ro-test.txt") + line = getline_qemu(output, "Read-only file system") + self.assertTrue(line, msg=output) + + def get_working_config(self): + return """ +DISTRO_FEATURES:append = " systemd" + +# Use systemd as init manager +VIRTUAL-RUNTIME_init_manager = "systemd" + +# enable overlayfs in the kernel +KERNEL_EXTRA_FEATURES:append = " features/overlayfs/overlayfs.scc" + +IMAGE_FSTYPES += "wic" +OVERLAYFS_INIT_OPTION = "{OVERLAYFS_INIT_OPTION}" +WKS_FILE = "overlayfs_etc.wks.in" + +EXTRA_IMAGE_FEATURES += "read-only-rootfs" +# Image configuration for overlayfs-etc +EXTRA_IMAGE_FEATURES += "overlayfs-etc" +IMAGE_FEATURES:remove = "package-management" +OVERLAYFS_ETC_MOUNT_POINT = "/data" +OVERLAYFS_ETC_FSTYPE = "ext4" +OVERLAYFS_ETC_DEVICE = "/dev/sda3" +OVERLAYFS_ETC_USE_ORIG_INIT_NAME = "{OVERLAYFS_ETC_USE_ORIG_INIT_NAME}" +""" -- 2.30.2
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