Merge remote branch 'cros/upstream' into master

client/tests/kvm/test_setup.py

Index: client/tests/kvm/test_setup.py
diff --git a/client/tests/kvm/test_setup.py b/client/tests/kvm/test_setup.py
new file mode 100644
index 0000000000000000000000000000000000000000..eebe0c36f188be970404cf5f07a1e2afda506aae
--- /dev/null
+++ b/client/tests/kvm/test_setup.py
@@ -0,0 +1,695 @@
+"""
+Library to perform pre/post test setup for KVM autotest.
+"""
+import os, shutil, tempfile, re, ConfigParser, glob, inspect
+import logging, time
+from autotest_lib.client.common_lib import error
+from autotest_lib.client.bin import utils
+
+
+@error.context_aware
+def cleanup(dir):
+    """
+    If dir is a mountpoint, do what is possible to unmount it. Afterwards,
+    try to remove it.
+
+    @param dir: Directory to be cleaned up.
+    """
+    error.context("cleaning up unattended install directory %s" % dir)
+    if os.path.ismount(dir):
+        utils.run('fuser -k %s' % dir, ignore_status=True)
+        utils.run('umount %s' % dir)
+    if os.path.isdir(dir):
+        shutil.rmtree(dir)
+
+
+@error.context_aware
+def clean_old_image(image):
+    """
+    Clean a leftover image file from previous processes. If it contains a
+    mounted file system, do the proper cleanup procedures.
+
+    @param image: Path to image to be cleaned up.
+    """
+    error.context("cleaning up old leftover image %s" % image)
+    if os.path.exists(image):
+        mtab = open('/etc/mtab', 'r')
+        mtab_contents = mtab.read()
+        mtab.close()
+        if image in mtab_contents:
+            utils.run('fuser -k %s' % image, ignore_status=True)
+            utils.run('umount %s' % image)
+        os.remove(image)
+
+
+def display_attributes(instance):
+    """
+    Inspects a given class instance attributes and displays them, convenient
+    for debugging.
+    """
+    logging.debug("Attributes set:")
+    for member in inspect.getmembers(instance):
+        name, value = member
+        attribute = getattr(instance, name)
+        if not (name.startswith("__") or callable(attribute) or not value):
+            logging.debug("    %s: %s", name, value)
+
+
+class Disk(object):
+    """
+    Abstract class for Disk objects, with the common methods implemented.
+    """
+    def __init__(self):
+        self.path = None
+
+
+    def setup_answer_file(self, filename, contents):
+        utils.open_write_close(os.path.join(self.mount, filename), contents)
+
+
+    def copy_to(self, src):
+        dst = os.path.join(self.mount, os.path.basename(src))
+        if os.path.isdir(src):
+            shutil.copytree(src, dst)
+        elif os.path.isfile(src):
+            shutil.copyfile(src, dst)
+
+
+    def close(self):
+        os.chmod(self.path, 0755)
+        cleanup(self.mount)
+        logging.debug("Disk %s successfuly set", self.path)
+
+
+class FloppyDisk(Disk):
+    """
+    Represents a 1.44 MB floppy disk. We can copy files to it, and setup it in
+    convenient ways.
+    """
+    @error.context_aware
+    def __init__(self, path, qemu_img_binary, tmpdir):
+        error.context("Creating unattended install floppy image %s" % path)
+        self.tmpdir = tmpdir
+        self.mount = tempfile.mkdtemp(prefix='floppy_', dir=self.tmpdir)
+        self.virtio_mount = None
+        self.path = path
+        clean_old_image(path)
+        if not os.path.isdir(os.path.dirname(path)):
+            os.makedirs(os.path.dirname(path))
+
+        try:
+            c_cmd = '%s create -f raw %s 1440k' % (qemu_img_binary, path)
+            utils.run(c_cmd)
+            f_cmd = 'mkfs.msdos -s 1 %s' % path
+            utils.run(f_cmd)
+            m_cmd = 'mount -o loop,rw %s %s' % (path, self.mount)
+            utils.run(m_cmd)
+        except error.CmdError, e:
+            cleanup(self.mount)
+            raise
+
+
+    def _copy_virtio_drivers(self, virtio_floppy):
+        """
+        Copy the virtio drivers on the virtio floppy to the install floppy.
+
+        1) Mount the floppy containing the viostor drivers
+        2) Copy its contents to the root of the install floppy
+        """
+        virtio_mount = tempfile.mkdtemp(prefix='virtio_floppy_',
+                                        dir=self.tmpdir)
+
+        pwd = os.getcwd()
+        try:
+            m_cmd = 'mount -o loop %s %s' % (virtio_floppy, virtio_mount)
+            utils.run(m_cmd)
+            os.chdir(virtio_mount)
+            path_list = glob.glob('*')
+            for path in path_list:
+                self.copy_to(path)
+        finally:
+            os.chdir(pwd)
+            cleanup(virtio_mount)
+
+
+    def setup_virtio_win2003(self, virtio_floppy, virtio_oemsetup_id):
+        """
+        Setup the install floppy with the virtio storage drivers, win2003 style.
+
+        Win2003 and WinXP depend on the file txtsetup.oem file to install
+        the virtio drivers from the floppy, which is a .ini file.
+        Process:
+
+        1) Copy the virtio drivers on the virtio floppy to the install floppy
+        2) Parse the ini file with config parser
+        3) Modify the identifier of the default session that is going to be
+           executed on the config parser object
+        4) Re-write the config file to the disk
+        """
+        self._copy_virtio_drivers(virtio_floppy)
+        txtsetup_oem = os.path.join(self.mount, 'txtsetup.oem')
+        if not os.path.isfile(txtsetup_oem):
+            raise IOError('File txtsetup.oem not found on the install '
+                          'floppy. Please verify if your floppy virtio '
+                          'driver image has this file')
+        parser = ConfigParser.ConfigParser()
+        parser.read(txtsetup_oem)
+        if not parser.has_section('Defaults'):
+            raise ValueError('File txtsetup.oem does not have the session '
+                             '"Defaults". Please check txtsetup.oem')
+        default_driver = parser.get('Defaults', 'SCSI')
+        if default_driver != virtio_oemsetup_id:
+            parser.set('Defaults', 'SCSI', virtio_oemsetup_id)
+            fp = open(txtsetup_oem, 'w')
+            parser.write(fp)
+            fp.close()
+
+
+    def setup_virtio_win2008(self, virtio_floppy):
+        """
+        Setup the install floppy with the virtio storage drivers, win2008 style.
+
+        Win2008, Vista and 7 require people to point out the path to the drivers
+        on the unattended file, so we just need to copy the drivers to the
+        driver floppy disk.
+        Process:
+
+        1) Copy the virtio drivers on the virtio floppy to the install floppy
+        """
+        self._copy_virtio_drivers(virtio_floppy)
+
+
+class CdromDisk(Disk):
+    """
+    Represents a CDROM disk that we can master according to our needs.
+    """
+    def __init__(self, path, tmpdir):
+        self.mount = tempfile.mkdtemp(prefix='cdrom_unattended_', dir=tmpdir)
+        self.path = path
+        clean_old_image(path)
+        if not os.path.isdir(os.path.dirname(path)):
+            os.makedirs(os.path.dirname(path))
+
+
+    @error.context_aware
+    def close(self):
+        error.context("Creating unattended install CD image %s" % self.path)
+        g_cmd = ('mkisofs -o %s -max-iso9660-filenames '
+                 '-relaxed-filenames -D --input-charset iso8859-1 '
+                 '%s' % (self.path, self.mount))
+        utils.run(g_cmd)
+
+        os.chmod(self.path, 0755)
+        cleanup(self.mount)
+        logging.debug("unattended install CD image %s successfuly created",
+                      self.path)
+
+
+class UnattendedInstallConfig(object):
+    """
+    Creates a floppy disk image that will contain a config file for unattended
+    OS install. The parameters to the script are retrieved from environment
+    variables.
+    """
+    def __init__(self, test, params):
+        """
+        Sets class atributes from test parameters.
+
+        @param test: KVM test object.
+        @param params: Dictionary with test parameters.
+        """
+        root_dir = test.bindir
+        images_dir = os.path.join(root_dir, 'images')
+        self.deps_dir = os.path.join(root_dir, 'deps')
+        self.unattended_dir = os.path.join(root_dir, 'unattended')
+
+        attributes = ['kernel_args', 'finish_program', 'cdrom_cd1',
+                      'unattended_file', 'medium', 'url', 'kernel', 'initrd',
+                      'nfs_server', 'nfs_dir', 'install_virtio', 'floppy',
+                      'cdrom_unattended', 'boot_path', 'extra_params',
+                      'qemu_img_binary']
+
+        for a in attributes:
+            setattr(self, a, params.get(a, ''))
+
+        if self.install_virtio == 'yes':
+            v_attributes = ['virtio_floppy', 'virtio_storage_path',
+                            'virtio_network_path', 'virtio_oemsetup_id',
+                            'virtio_network_installer']
+            for va in v_attributes:
+                setattr(self, va, params.get(va, ''))
+
+        self.tmpdir = test.tmpdir
+
+        if getattr(self, 'unattended_file'):
+            self.unattended_file = os.path.join(root_dir, self.unattended_file)
+
+        if getattr(self, 'qemu_img_binary'):
+            if not os.path.isfile(getattr(self, 'qemu_img_binary')):
+                self.qemu_img_binary = os.path.join(root_dir,
+                                                    self.qemu_img_binary)
+
+        if getattr(self, 'cdrom_cd1'):
+            self.cdrom_cd1 = os.path.join(root_dir, self.cdrom_cd1)
+        self.cdrom_cd1_mount = tempfile.mkdtemp(prefix='cdrom_cd1_',
+                                                dir=self.tmpdir)
+        if self.medium == 'nfs':
+            self.nfs_mount = tempfile.mkdtemp(prefix='nfs_',
+                                              dir=self.tmpdir)
+
+        if getattr(self, 'floppy'):
+            self.floppy = os.path.join(root_dir, self.floppy)
+            if not os.path.isdir(os.path.dirname(self.floppy)):
+                os.makedirs(os.path.dirname(self.floppy))
+
+        self.image_path = os.path.dirname(self.kernel)
+
+
+    @error.context_aware
+    def render_answer_file(self):
+        """
+        Replace KVM_TEST_CDKEY (in the unattended file) with the cdkey
+        provided for this test and replace the KVM_TEST_MEDIUM with
+        the tree url or nfs address provided for this test.
+
+        @return: Answer file contents
+        """
+        error.base_context('Rendering final answer file')
+        error.context('Reading answer file %s' % self.unattended_file)
+        unattended_contents = open(self.unattended_file).read()
+        dummy_cdkey_re = r'\bKVM_TEST_CDKEY\b'
+        real_cdkey = os.environ.get('KVM_TEST_cdkey')
+        if re.search(dummy_cdkey_re, unattended_contents):
+            if real_cdkey:
+                unattended_contents = re.sub(dummy_cdkey_re, real_cdkey,
+                                             unattended_contents)
+            else:
+                print ("WARNING: 'cdkey' required but not specified for "
+                       "this unattended installation")
+
+        dummy_medium_re = r'\bKVM_TEST_MEDIUM\b'
+        if self.medium == "cdrom":
+            content = "cdrom"
+        elif self.medium == "url":
+            content = "url --url %s" % self.url
+        elif self.medium == "nfs":
+            content = "nfs --server=%s --dir=%s" % (self.nfs_server,
+                                                    self.nfs_dir)
+        else:
+            raise ValueError("Unexpected installation medium %s" % self.url)
+
+        unattended_contents = re.sub(dummy_medium_re, content,
+                                     unattended_contents)
+
+        def replace_virtio_key(contents, dummy_re, env):
+            """
+            Replace a virtio dummy string with contents.
+
+            If install_virtio is not set, replace it with a dummy string.
+
+            @param contents: Contents of the unattended file
+            @param dummy_re: Regular expression used to search on the.
+                    unattended file contents.
+            @param env: Name of the environment variable.
+            """
+            dummy_path = "C:"
+            driver = os.environ.get(env, '')
+
+            if re.search(dummy_re, contents):
+                if self.install_virtio == "yes":
+                    if driver.endswith("msi"):
+                        driver = 'msiexec /passive /package ' + driver
+                    else:
+                        try:
+                            # Let's escape windows style paths properly
+                            drive, path = driver.split(":")
+                            driver = drive + ":" + re.escape(path)
+                        except:
+                            pass
+                    contents = re.sub(dummy_re, driver, contents)
+                else:
+                    contents = re.sub(dummy_re, dummy_path, contents)
+            return contents
+
+        vdict = {r'\bKVM_TEST_STORAGE_DRIVER_PATH\b':
+                 'KVM_TEST_virtio_storage_path',
+                 r'\bKVM_TEST_NETWORK_DRIVER_PATH\b':
+                 'KVM_TEST_virtio_network_path',
+                 r'\bKVM_TEST_VIRTIO_NETWORK_INSTALLER\b':
+                 'KVM_TEST_virtio_network_installer_path'}
+
+        for vkey in vdict:
+            unattended_contents = replace_virtio_key(unattended_contents,
+                                                     vkey, vdict[vkey])
+
+        logging.debug("Unattended install contents:")
+        for line in unattended_contents.splitlines():
+            logging.debug(line)
+        return unattended_contents
+
+
+    def setup_boot_disk(self):
+        answer_contents = self.render_answer_file()
+
+        if self.unattended_file.endswith('.sif'):
+            dest_fname = 'winnt.sif'
+            setup_file = 'winnt.bat'
+            boot_disk = FloppyDisk(self.floppy, self.qemu_img_binary,
+                                   self.tmpdir)
+            boot_disk.setup_answer_file(dest_fname, answer_contents)
+            setup_file_path = os.path.join(self.unattended_dir, setup_file)
+            boot_disk.copy_to(setup_file_path)
+            if self.install_virtio == "yes":
+                boot_disk.setup_virtio_win2003(self.virtio_floppy,
+                                               self.virtio_oemsetup_id)
+            boot_disk.copy_to(self.finish_program)
+
+        elif self.unattended_file.endswith('.ks'):
+            # Red Hat kickstart install
+            dest_fname = 'ks.cfg'
+            if self.cdrom_unattended:
+                boot_disk = CdromDisk(self.cdrom_unattended, self.tmpdir)
+            elif self.floppy:
+                boot_disk = FloppyDisk(self.floppy, self.qemu_img_binary,
+                                       self.tmpdir)
+            else:
+                raise ValueError("Neither cdrom_unattended nor floppy set "
+                                 "on the config file, please verify")
+            boot_disk.setup_answer_file(dest_fname, answer_contents)
+
+        elif self.unattended_file.endswith('.xml'):
+            if "autoyast" in self.extra_params:
+                # SUSE autoyast install
+                dest_fname = "autoinst.xml"
+                if self.cdrom_unattended:
+                    boot_disk = CdromDisk(self.cdrom_unattended)
+                elif self.floppy:
+                    boot_disk = FloppyDisk(self.floppy, self.qemu_img_binary,
+                                           self.tmpdir)
+                else:
+                    raise ValueError("Neither cdrom_unattended nor floppy set "
+                                     "on the config file, please verify")
+                boot_disk.setup_answer_file(dest_fname, answer_contents)
+
+            else:
+                # Windows unattended install
+                dest_fname = "autounattend.xml"
+                boot_disk = FloppyDisk(self.floppy, self.qemu_img_binary,
+                                       self.tmpdir)
+                boot_disk.setup_answer_file(dest_fname, answer_contents)
+                if self.install_virtio == "yes":
+                    boot_disk.setup_virtio_win2008(self.virtio_floppy)
+                boot_disk.copy_to(self.finish_program)
+
+        else:
+            raise ValueError('Unknown answer file type: %s' %
+                             self.unattended_file)
+
+        boot_disk.close()
+
+
+    @error.context_aware
+    def setup_cdrom(self):
+        """
+        Mount cdrom and copy vmlinuz and initrd.img.
+        """
+        error.context("Copying vmlinuz and initrd.img from install cdrom %s" %
+                      self.cdrom_cd1)
+        m_cmd = ('mount -t iso9660 -v -o loop,ro %s %s' %
+                 (self.cdrom_cd1, self.cdrom_cd1_mount))
+        utils.run(m_cmd)
+
+        try:
+            if not os.path.isdir(self.image_path):
+                os.makedirs(self.image_path)
+            kernel_fetch_cmd = ("cp %s/%s/%s %s" %
+                                (self.cdrom_cd1_mount, self.boot_path,
+                                 os.path.basename(self.kernel), self.kernel))
+            utils.run(kernel_fetch_cmd)
+            initrd_fetch_cmd = ("cp %s/%s/%s %s" %
+                                (self.cdrom_cd1_mount, self.boot_path,
+                                 os.path.basename(self.initrd), self.initrd))
+            utils.run(initrd_fetch_cmd)
+        finally:
+            cleanup(self.cdrom_cd1_mount)
+
+
+    @error.context_aware
+    def setup_url(self):
+        """
+        Download the vmlinuz and initrd.img from URL.
+        """
+        error.context("downloading vmlinuz and initrd.img from %s" % self.url)
+        os.chdir(self.image_path)
+        kernel_fetch_cmd = "wget -q %s/%s/%s" % (self.url, self.boot_path,
+                                                 os.path.basename(self.kernel))
+        initrd_fetch_cmd = "wget -q %s/%s/%s" % (self.url, self.boot_path,
+                                                 os.path.basename(self.initrd))
+
+        if os.path.exists(self.kernel):
+            os.remove(self.kernel)
+        if os.path.exists(self.initrd):
+            os.remove(self.initrd)
+
+        utils.run(kernel_fetch_cmd)
+        utils.run(initrd_fetch_cmd)
+
+
+    def setup_nfs(self):
+        """
+        Copy the vmlinuz and initrd.img from nfs.
+        """
+        error.context("copying the vmlinuz and initrd.img from NFS share")
+
+        m_cmd = ("mount %s:%s %s -o ro" %
+                 (self.nfs_server, self.nfs_dir, self.nfs_mount))
+        utils.run(m_cmd)
+
+        try:
+            kernel_fetch_cmd = ("cp %s/%s/%s %s" %
+                                (self.nfs_mount, self.boot_path,
+                                os.path.basename(self.kernel), self.image_path))
+            utils.run(kernel_fetch_cmd)
+            initrd_fetch_cmd = ("cp %s/%s/%s %s" %
+                                (self.nfs_mount, self.boot_path,
+                                os.path.basename(self.initrd), self.image_path))
+            utils.run(initrd_fetch_cmd)
+        finally:
+            cleanup(self.nfs_mount)
+
+
+    def setup(self):
+        """
+        Configure the environment for unattended install.
+
+        Uses an appropriate strategy according to each install model.
+        """
+        logging.info("Starting unattended install setup")
+        display_attributes(self)
+
+        if self.unattended_file and (self.floppy or self.cdrom_unattended):
+            self.setup_boot_disk()
+        if self.medium == "cdrom":
+            if self.kernel and self.initrd:
+                self.setup_cdrom()
+        elif self.medium == "url":
+            self.setup_url()
+        elif self.medium == "nfs":
+            self.setup_nfs()
+        else:
+            raise ValueError("Unexpected installation method %s" %
+                             self.medium)
+
+
+class HugePageConfig(object):
+    def __init__(self, params):
+        """
+        Gets environment variable values and calculates the target number
+        of huge memory pages.
+
+        @param params: Dict like object containing parameters for the test.
+        """
+        self.vms = len(params.objects("vms"))
+        self.mem = int(params.get("mem"))
+        self.max_vms = int(params.get("max_vms", 0))
+        self.hugepage_path = '/mnt/kvm_hugepage'
+        self.hugepage_size = self.get_hugepage_size()
+        self.target_hugepages = self.get_target_hugepages()
+        self.kernel_hp_file = '/proc/sys/vm/nr_hugepages'
+
+
+    def get_hugepage_size(self):
+        """
+        Get the current system setting for huge memory page size.
+        """
+        meminfo = open('/proc/meminfo', 'r').readlines()
+        huge_line_list = [h for h in meminfo if h.startswith("Hugepagesize")]
+        try:
+            return int(huge_line_list[0].split()[1])
+        except ValueError, e:
+            raise ValueError("Could not get huge page size setting from "
+                             "/proc/meminfo: %s" % e)
+
+
+    def get_target_hugepages(self):
+        """
+        Calculate the target number of hugepages for testing purposes.
+        """
+        if self.vms < self.max_vms:
+            self.vms = self.max_vms
+        # memory of all VMs plus qemu overhead of 64MB per guest
+        vmsm = (self.vms * self.mem) + (self.vms * 64)
+        return int(vmsm * 1024 / self.hugepage_size)
+
+
+    @error.context_aware
+    def set_hugepages(self):
+        """
+        Sets the hugepage limit to the target hugepage value calculated.
+        """
+        error.context("setting hugepages limit to %s" % self.target_hugepages)
+        hugepage_cfg = open(self.kernel_hp_file, "r+")
+        hp = hugepage_cfg.readline()
+        while int(hp) < self.target_hugepages:
+            loop_hp = hp
+            hugepage_cfg.write(str(self.target_hugepages))
+            hugepage_cfg.flush()
+            hugepage_cfg.seek(0)
+            hp = int(hugepage_cfg.readline())
+            if loop_hp == hp:
+                raise ValueError("Cannot set the kernel hugepage setting "
+                                 "to the target value of %d hugepages." %
+                                 self.target_hugepages)
+        hugepage_cfg.close()
+        logging.debug("Successfuly set %s large memory pages on host ",
+                      self.target_hugepages)
+
+
+    @error.context_aware
+    def mount_hugepage_fs(self):
+        """
+        Verify if there's a hugetlbfs mount set. If there's none, will set up
+        a hugetlbfs mount using the class attribute that defines the mount
+        point.
+        """
+        error.context("mounting hugepages path")
+        if not os.path.ismount(self.hugepage_path):
+            if not os.path.isdir(self.hugepage_path):
+                os.makedirs(self.hugepage_path)
+            cmd = "mount -t hugetlbfs none %s" % self.hugepage_path
+            utils.system(cmd)
+
+
+    def setup(self):
+        logging.debug("Number of VMs this test will use: %d", self.vms)
+        logging.debug("Amount of memory used by each vm: %s", self.mem)
+        logging.debug("System setting for large memory page size: %s",
+                      self.hugepage_size)
+        logging.debug("Number of large memory pages needed for this test: %s",
+                      self.target_hugepages)
+        self.set_hugepages()
+        self.mount_hugepage_fs()
+
+
+    @error.context_aware
+    def cleanup(self):
+        error.context("trying to dealocate hugepage memory")
+        try:
+            utils.system("umount %s" % self.hugepage_path)
+        except error.CmdError:
+            return
+        utils.system("echo 0 > %s" % self.kernel_hp_file)
+        logging.debug("Hugepage memory successfuly dealocated")
+
+
+class EnospcConfig(object):
+    """
+    Performs setup for the test enospc. This is a borg class, similar to a
+    singleton. The idea is to keep state in memory for when we call cleanup()
+    on postprocessing.
+    """
+    __shared_state = {}
+    def __init__(self, test, params):
+        self.__dict__ = self.__shared_state
+        root_dir = test.bindir
+        self.tmpdir = test.tmpdir
+        self.qemu_img_binary = params.get('qemu_img_binary')
+        if not os.path.isfile(self.qemu_img_binary):
+            self.qemu_img_binary = os.path.join(root_dir,
+                                                self.qemu_img_binary)
+        self.raw_file_path = os.path.join(self.tmpdir, 'enospc.raw')
+        # Here we're trying to choose fairly explanatory names so it's less
+        # likely that we run in conflict with other devices in the system
+        self.vgtest_name = params.get("vgtest_name")
+        self.lvtest_name = params.get("lvtest_name")
+        self.lvtest_device = "/dev/%s/%s" % (self.vgtest_name, self.lvtest_name)
+        image_dir = os.path.dirname(params.get("image_name"))
+        self.qcow_file_path = os.path.join(image_dir, 'enospc.qcow2')
+        try:
+            getattr(self, 'loopback')
+        except AttributeError:
+            self.loopback = ''
+
+
+    @error.context_aware
+    def setup(self):
+        logging.debug("Starting enospc setup")
+        error.context("performing enospc setup")
+        display_attributes(self)
+        # Double check if there aren't any leftovers
+        self.cleanup()
+        try:
+            utils.run("%s create -f raw %s 10G" %
+                      (self.qemu_img_binary, self.raw_file_path))
+            # Associate a loopback device with the raw file.
+            # Subject to race conditions, that's why try here to associate
+            # it with the raw file as quickly as possible
+            l_result = utils.run("losetup -f")
+            utils.run("losetup -f %s" % self.raw_file_path)
+            self.loopback = l_result.stdout.strip()
+            # Add the loopback device configured to the list of pvs
+            # recognized by LVM
+            utils.run("pvcreate %s" % self.loopback)
+            utils.run("vgcreate %s %s" % (self.vgtest_name, self.loopback))
+            # Create an lv inside the vg with starting size of 200M
+            utils.run("lvcreate -L 200M -n %s %s" %
+                      (self.lvtest_name, self.vgtest_name))
+            # Create a 10GB qcow2 image in the logical volume
+            utils.run("%s create -f qcow2 %s 10G" %
+                      (self.qemu_img_binary, self.lvtest_device))
+            # Let's symlink the logical volume with the image name that autotest
+            # expects this device to have
+            os.symlink(self.lvtest_device, self.qcow_file_path)
+        except Exception, e:
+            self.cleanup()
+            raise
+
+    @error.context_aware
+    def cleanup(self):
+        error.context("performing enospc cleanup")
+        if os.path.isfile(self.lvtest_device):
+            utils.run("fuser -k %s" % self.lvtest_device)
+            time.sleep(2)
+        l_result = utils.run("lvdisplay")
+        # Let's remove all volumes inside the volume group created
+        if self.lvtest_name in l_result.stdout:
+            utils.run("lvremove -f %s" % self.lvtest_device)
+        # Now, removing the volume group itself
+        v_result = utils.run("vgdisplay")
+        if self.vgtest_name in v_result.stdout:
+            utils.run("vgremove -f %s" % self.vgtest_name)
+        # Now, if we can, let's remove the physical volume from lvm list
+        if self.loopback:
+            p_result = utils.run("pvdisplay")
+            if self.loopback in p_result.stdout:
+                utils.run("pvremove -f %s" % self.loopback)
+        l_result = utils.run('losetup -a')
+        if self.loopback and (self.loopback in l_result.stdout):
+            try:
+                utils.run("losetup -d %s" % self.loopback)
+            except error.CmdError:
+                logging.error("Failed to liberate loopback %s", self.loopback)
+        if os.path.islink(self.qcow_file_path):
+            os.remove(self.qcow_file_path)
+        if os.path.isfile(self.raw_file_path):
+            os.remove(self.raw_file_path)