31a39a0568
This implements the VFS APIs by using the nova.virt.disk.mount.Mount APIs to map the virtual disk image into the host filesystem. This only uses the loop/qemu-nbd mount implementations, since there will be a dedicated libguestfs VFS API avoiding the need for the guestfs mount impl blueprint: virt-disk-api-refactoring Change-Id: Ifeb04770d55a3d1627db807322d57c0bedfc59cb Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
356 lines
13 KiB
Python
356 lines
13 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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#
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# Copyright (C) 2012 Red Hat, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import sys
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from nova import exception
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from nova import test
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from nova import tests
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from nova import utils
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from nova.virt.disk.vfs import localfs as vfsimpl
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dirs = []
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files = {}
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commands = []
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def fake_execute(*args, **kwargs):
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commands.append({"args": args, "kwargs": kwargs})
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if args[0] == "readlink":
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if args[1] == "-nm":
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if args[2] in ["/scratch/dir/some/file",
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"/scratch/dir/some/dir",
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"/scratch/dir/other/dir",
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"/scratch/dir/other/file"]:
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return args[2], ""
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elif args[1] == "-e":
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if args[2] in files:
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return args[2], ""
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return "", "No such file"
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elif args[0] == "mkdir":
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dirs.append(args[2])
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elif args[0] == "chown":
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owner = args[1]
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path = args[2]
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if not path in files:
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raise Exception("No such file: " + path)
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sep = owner.find(':')
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if sep != -1:
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user = owner[0:sep]
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group = owner[sep + 1:]
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else:
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user = owner
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group = None
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if user:
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if user == "fred":
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uid = 105
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else:
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uid = 110
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files[path]["uid"] = uid
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if group:
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if group == "users":
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gid = 500
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else:
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gid = 600
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files[path]["gid"] = gid
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elif args[0] == "chgrp":
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group = args[1]
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path = args[2]
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if not path in files:
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raise Exception("No such file: " + path)
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if group == "users":
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gid = 500
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else:
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gid = 600
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files[path]["gid"] = gid
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elif args[0] == "chmod":
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mode = args[1]
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path = args[2]
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if not path in files:
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raise Exception("No such file: " + path)
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files[path]["mode"] = int(mode, 8)
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elif args[0] == "cat":
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path = args[1]
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if not path in files:
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files[path] = {
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"content": "Hello World",
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"gid": 100,
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"uid": 100,
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"mode": 0700
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}
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return files[path]["content"], ""
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elif args[0] == "tee":
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if args[1] == "-a":
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path = args[2]
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append = True
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else:
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path = args[1]
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append = False
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print str(files)
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if not path in files:
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files[path] = {
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"content": "Hello World",
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"gid": 100,
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"uid": 100,
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"mode": 0700,
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}
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if append:
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files[path]["content"] += kwargs["process_input"]
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else:
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files[path]["content"] = kwargs["process_input"]
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class VirtDiskVFSLocalFSTestPaths(test.TestCase):
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def setUp(self):
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super(VirtDiskVFSLocalFSTestPaths, self).setUp()
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real_execute = utils.execute
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def nonroot_execute(*cmd_parts, **kwargs):
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kwargs.pop('run_as_root', None)
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return real_execute(*cmd_parts, **kwargs)
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self.stubs.Set(utils, 'execute', nonroot_execute)
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def test_check_safe_path(self):
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if tests.utils.is_osx():
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self.skipTest("Unable to test on OSX")
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vfs = vfsimpl.VFSLocalFS("dummy.img")
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vfs.imgdir = "/foo"
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ret = vfs._canonical_path('etc/something.conf')
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self.assertEquals(ret, '/foo/etc/something.conf')
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def test_check_unsafe_path(self):
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if tests.utils.is_osx():
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self.skipTest("Unable to test on OSX")
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vfs = vfsimpl.VFSLocalFS("dummy.img")
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vfs.imgdir = "/foo"
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self.assertRaises(exception.Invalid,
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vfs._canonical_path,
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'etc/../../../something.conf')
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class VirtDiskVFSLocalFSTest(test.TestCase):
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def setUp(self):
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super(VirtDiskVFSLocalFSTest, self).setUp()
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def test_makepath(self):
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global dirs, commands
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dirs = []
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commands = []
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self.stubs.Set(utils, 'execute', fake_execute)
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vfs = vfsimpl.VFSLocalFS(imgfile="/dummy.qcow2", imgfmt="qcow2")
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vfs.imgdir = "/scratch/dir"
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vfs.make_path("/some/dir")
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vfs.make_path("/other/dir")
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self.assertEqual(dirs,
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["/scratch/dir/some/dir", "/scratch/dir/other/dir"]),
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self.assertEqual(commands,
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[{'args': ('readlink', '-nm',
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'/scratch/dir/some/dir'),
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'kwargs': {'run_as_root': True}},
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{'args': ('mkdir', '-p',
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'/scratch/dir/some/dir'),
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'kwargs': {'run_as_root': True}},
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{'args': ('readlink', '-nm',
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'/scratch/dir/other/dir'),
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'kwargs': {'run_as_root': True}},
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{'args': ('mkdir', '-p',
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'/scratch/dir/other/dir'),
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'kwargs': {'run_as_root': True}}])
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def test_append_file(self):
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global files, commands
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files = {}
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commands = []
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self.stubs.Set(utils, 'execute', fake_execute)
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vfs = vfsimpl.VFSLocalFS(imgfile="/dummy.qcow2", imgfmt="qcow2")
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vfs.imgdir = "/scratch/dir"
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vfs.append_file("/some/file", " Goodbye")
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self.assertTrue("/scratch/dir/some/file" in files)
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self.assertEquals(files["/scratch/dir/some/file"]["content"],
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"Hello World Goodbye")
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self.assertEqual(commands,
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[{'args': ('readlink', '-nm',
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'/scratch/dir/some/file'),
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'kwargs': {'run_as_root': True}},
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{'args': ('tee', '-a',
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'/scratch/dir/some/file'),
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'kwargs': {'process_input': ' Goodbye',
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'run_as_root': True}}])
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def test_replace_file(self):
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global files, commands
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files = {}
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commands = []
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self.stubs.Set(utils, 'execute', fake_execute)
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vfs = vfsimpl.VFSLocalFS(imgfile="/dummy.qcow2", imgfmt="qcow2")
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vfs.imgdir = "/scratch/dir"
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vfs.replace_file("/some/file", "Goodbye")
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self.assertTrue("/scratch/dir/some/file" in files)
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self.assertEquals(files["/scratch/dir/some/file"]["content"],
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"Goodbye")
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self.assertEqual(commands,
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[{'args': ('readlink', '-nm',
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'/scratch/dir/some/file'),
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'kwargs': {'run_as_root': True}},
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{'args': ('tee', '/scratch/dir/some/file'),
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'kwargs': {'process_input': 'Goodbye',
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'run_as_root': True}}])
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def test_read_file(self):
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global commands, files
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files = {}
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commands = []
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self.stubs.Set(utils, 'execute', fake_execute)
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vfs = vfsimpl.VFSLocalFS(imgfile="/dummy.qcow2", imgfmt="qcow2")
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vfs.imgdir = "/scratch/dir"
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self.assertEqual(vfs.read_file("/some/file"), "Hello World")
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self.assertEqual(commands,
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[{'args': ('readlink', '-nm',
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'/scratch/dir/some/file'),
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'kwargs': {'run_as_root': True}},
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{'args': ('cat', '/scratch/dir/some/file'),
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'kwargs': {'run_as_root': True}}])
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def test_has_file(self):
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global commands, files
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files = {}
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commands = []
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self.stubs.Set(utils, 'execute', fake_execute)
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vfs = vfsimpl.VFSLocalFS(imgfile="/dummy.qcow2", imgfmt="qcow2")
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vfs.imgdir = "/scratch/dir"
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vfs.read_file("/some/file")
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self.assertTrue(vfs.has_file("/some/file"))
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self.assertFalse(vfs.has_file("/other/file"))
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self.assertEqual(commands,
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[{'args': ('readlink', '-nm',
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'/scratch/dir/some/file'),
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'kwargs': {'run_as_root': True}},
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{'args': ('cat', '/scratch/dir/some/file'),
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'kwargs': {'run_as_root': True}},
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{'args': ('readlink', '-nm',
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'/scratch/dir/some/file'),
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'kwargs': {'run_as_root': True}},
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{'args': ('readlink', '-e',
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'/scratch/dir/some/file'),
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'kwargs': {'run_as_root': True}},
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{'args': ('readlink', '-nm',
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'/scratch/dir/other/file'),
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'kwargs': {'run_as_root': True}},
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{'args': ('readlink', '-e',
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'/scratch/dir/other/file'),
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'kwargs': {'run_as_root': True}},
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])
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def test_set_permissions(self):
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global commands, files
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commands = []
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files = {}
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self.stubs.Set(utils, 'execute', fake_execute)
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vfs = vfsimpl.VFSLocalFS(imgfile="/dummy.qcow2", imgfmt="qcow2")
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vfs.imgdir = "/scratch/dir"
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vfs.read_file("/some/file")
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vfs.set_permissions("/some/file", 0777)
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self.assertEquals(files["/scratch/dir/some/file"]["mode"], 0777)
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self.assertEqual(commands,
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[{'args': ('readlink', '-nm',
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'/scratch/dir/some/file'),
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'kwargs': {'run_as_root': True}},
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{'args': ('cat', '/scratch/dir/some/file'),
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'kwargs': {'run_as_root': True}},
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{'args': ('readlink', '-nm',
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'/scratch/dir/some/file'),
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'kwargs': {'run_as_root': True}},
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{'args': ('chmod', '777',
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'/scratch/dir/some/file'),
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'kwargs': {'run_as_root': True}}])
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def test_set_ownership(self):
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global commands, files
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commands = []
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files = {}
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self.stubs.Set(utils, 'execute', fake_execute)
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vfs = vfsimpl.VFSLocalFS(imgfile="/dummy.qcow2", imgfmt="qcow2")
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vfs.imgdir = "/scratch/dir"
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vfs.read_file("/some/file")
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self.assertEquals(files["/scratch/dir/some/file"]["uid"], 100)
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self.assertEquals(files["/scratch/dir/some/file"]["gid"], 100)
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vfs.set_ownership("/some/file", "fred", None)
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self.assertEquals(files["/scratch/dir/some/file"]["uid"], 105)
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self.assertEquals(files["/scratch/dir/some/file"]["gid"], 100)
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vfs.set_ownership("/some/file", None, "users")
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self.assertEquals(files["/scratch/dir/some/file"]["uid"], 105)
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self.assertEquals(files["/scratch/dir/some/file"]["gid"], 500)
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vfs.set_ownership("/some/file", "joe", "admins")
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self.assertEquals(files["/scratch/dir/some/file"]["uid"], 110)
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self.assertEquals(files["/scratch/dir/some/file"]["gid"], 600)
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self.assertEqual(commands,
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[{'args': ('readlink', '-nm',
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'/scratch/dir/some/file'),
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'kwargs': {'run_as_root': True}},
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{'args': ('cat', '/scratch/dir/some/file'),
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'kwargs': {'run_as_root': True}},
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{'args': ('readlink', '-nm',
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'/scratch/dir/some/file'),
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'kwargs': {'run_as_root': True}},
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{'args': ('chown', 'fred',
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'/scratch/dir/some/file'),
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'kwargs': {'run_as_root': True}},
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{'args': ('readlink', '-nm',
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'/scratch/dir/some/file'),
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'kwargs': {'run_as_root': True}},
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{'args': ('chgrp', 'users',
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'/scratch/dir/some/file'),
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'kwargs': {'run_as_root': True}},
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{'args': ('readlink', '-nm',
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'/scratch/dir/some/file'),
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'kwargs': {'run_as_root': True}},
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{'args': ('chown', 'joe:admins',
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'/scratch/dir/some/file'),
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'kwargs': {'run_as_root': True}}])
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