5112f72cbf
This modification will allow a user to ask to mount the system as read only for instance. Which would be super useful for image-info who is progressively using more of OSbuild internals to mount partitions.
122 lines
3.5 KiB
Python
Executable file
122 lines
3.5 KiB
Python
Executable file
#!/usr/bin/python3
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#
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# Runtime Tests for Device Host Services
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#
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import errno
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import json
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import os
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import subprocess
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import sys
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import tempfile
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from contextlib import contextmanager
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import pytest
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from osbuild import devices, host, meta, mounts
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from ..test import TestBase
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@pytest.fixture(name="tmpdir")
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def tmpdir_fixture():
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with tempfile.TemporaryDirectory(prefix="test-devices-") as tmp:
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yield tmp
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@contextmanager
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def make_arguments(opts):
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os.mkdir("/run/osbuild/api")
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with open("/run/osbuild/api/arguments", "w", encoding="utf-8") as f:
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json.dump(opts, f)
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try:
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yield
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finally:
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os.remove("/run/osbuild/api/arguments")
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os.rmdir("/run/osbuild/api")
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@contextmanager
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def make_dev_tmpfs(tmpdir):
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dev_path = os.path.join(tmpdir, "dev")
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os.makedirs(dev_path)
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subprocess.run(["mount", "-t", "tmpfs", "-o", "nosuid", "none", dev_path], check=True)
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yield dev_path
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subprocess.run(["umount", "--lazy", dev_path], check=True)
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@pytest.mark.skipif(not TestBase.can_bind_mount(), reason="root only")
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def test_mount_ro(tmpdir):
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index = meta.Index(os.curdir)
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# create a file to contain an image
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tree = os.path.join(tmpdir, "tree")
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os.makedirs(tree)
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size = 1024 * 1024
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file = os.path.join(tree, "image.img")
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with open(file, "wb") as f:
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f.truncate(size)
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# Create an FS in the image
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mkfsopts = {
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"devices": {
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"device": {
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"path": file
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}
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},
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"options": {
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"label": "TEST",
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"uuid": "FEEDFACE-CAFE-4004-FEED-C0DEC0FFEE11"
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}
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}
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with make_arguments(mkfsopts):
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subprocess.run(
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[os.path.join(os.curdir, "stages", "org.osbuild.mkfs.ext4")],
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check=True,
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stdout=sys.stdout,
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stderr=sys.stderr)
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with tempfile.TemporaryDirectory() as mountpoint:
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with host.ServiceManager() as mgr:
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with make_dev_tmpfs(tmpdir) as devpath:
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# Device manager to open the loopback device
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devmgr = devices.DeviceManager(mgr, devpath, tree)
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# get a Device for the loopback
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dev = devices.Device(
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"loop",
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index.get_module_info(
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"Device",
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"org.osbuild.loopback"
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),
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None,
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{
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"filename": "image.img",
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"start": 0,
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"size": size // 512 # size is in sectors / blocks
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}
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)
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# open the device and get its loopback path
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lpath = os.path.join(
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devpath,
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devmgr.open(dev)["path"]
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)
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# mount the loopback
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mounts.MountManager(
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devmgr,
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mountpoint
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).mount(
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mounts.Mount(
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lpath,
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index.get_module_info("Mount", "org.osbuild.ext4"),
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dev,
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"/",
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{"readonly": True}
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)
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)
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# try to write in it, and failure to do so is a success
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with pytest.raises(OSError) as err:
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with open(os.path.join(mountpoint, "test"), "w", encoding="utf-8") as f:
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f.write("should not work")
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assert err.value.errno == errno.EROFS # Check that FS is read only
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