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oeqa/selftest: Add lower layer test for overlayfs-etc

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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

(From OE-Core rev: 2fc742178675598208b400d9889a1681249d7eea)

Signed-off-by: Vyacheslav Yurkov <v.yurkov@precitec.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Vyacheslav Yurkov
2022-09-07 21:51:39 +02:00
committed by Richard Purdie
parent c3ec554ba5
commit 6cd5db1e62
2 changed files with 84 additions and 33 deletions
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7
meta-selftest/recipes-test/overlayfs-user/overlayfs-user.bb
View File

@@ -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 \
"

110
meta/lib/oeqa/selftest/cases/overlayfs.py
View File

@@ -381,7 +381,84 @@ OVERLAYFS_ETC_DEVICE = "/dev/sda3"
Author: Vyacheslav Yurkov <uvv.mail@gmail.com>
"""
config = """
config = self.get_working_config()
args = {
'OVERLAYFS_INIT_OPTION': "" if origInit else "init=/sbin/preinit",
'OVERLAYFS_ETC_USE_ORIG_INIT_NAME': int(origInit == True)
}
self.write_config(config.format(**args))
bitbake('core-image-minimal')
testFile = "/etc/my-test-data"
with runqemu('core-image-minimal', image_fstype='wic', discard_writes=False) as qemu:
status, output = qemu.run_serial("/bin/mount")
line = getline_qemu(output, "/dev/sda3")
self.assertTrue("/data" in output, msg=output)
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)
line = getline_qemu(output, testFile)
self.assertTrue(line and line.startswith(testFile), msg=output)
# Check that file exists in /etc after reboot
with runqemu('core-image-minimal', image_fstype='wic') as qemu:
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.mail@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
@@ -403,34 +480,3 @@ OVERLAYFS_ETC_FSTYPE = "ext4"
OVERLAYFS_ETC_DEVICE = "/dev/sda3"
OVERLAYFS_ETC_USE_ORIG_INIT_NAME = "{OVERLAYFS_ETC_USE_ORIG_INIT_NAME}"
"""
args = {
'OVERLAYFS_INIT_OPTION': "" if origInit else "init=/sbin/preinit",
'OVERLAYFS_ETC_USE_ORIG_INIT_NAME': int(origInit == True)
}
self.write_config(config.format(**args))
bitbake('core-image-minimal')
testFile = "/etc/my-test-data"
with runqemu('core-image-minimal', image_fstype='wic', discard_writes=False) as qemu:
status, output = qemu.run_serial("/bin/mount")
line = getline_qemu(output, "/dev/sda3")
self.assertTrue("/data" in output, msg=output)
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)
status, output = qemu.run_serial("touch " + testFile)
status, output = qemu.run_serial("sync")
status, output = qemu.run_serial("ls -1 " + testFile)
line = getline_qemu(output, testFile)
self.assertTrue(line and line.startswith(testFile), msg=output)
# Check that file exists in /etc after reboot
with runqemu('core-image-minimal', image_fstype='wic') as qemu:
status, output = qemu.run_serial("ls -1 " + testFile)
line = getline_qemu(output, testFile)
self.assertTrue(line and line.startswith(testFile), msg=output)