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How to use vg_check method in avocado

Best Python code snippet using avocado_python
lv_utils.py
Source:lv_utils.py
...84@error.context_aware85def lv_ramdisk(vg_name, pool_name, pool_size):86    error.context("Creating thin pool for thinly provisioned volumes",87                  logging.info)88    if not vg_check(vg_name):89        raise error.TestError("Volume group could not be found")90    if lv_check(vg_name, pool_name):91        raise error.TestError("Thin pool already exists")92    cmd = "lvcreate -L %s --thin %s/%s" % (pool_size, vg_name, pool_name)93    result = utils.run(cmd)94    logging.info(result.stdout.rstrip())95def vg_ramdisk_cleanup(ramdisk_filename=None, vg_ramdisk_dir=None,96                       vg_name=None, loop_device=None, use_tmpfs=True):97    """98    Inline cleanup function in case of test error.99    """100    if vg_name is not None:101        loop_device = re.search("([/\w]+) %s lvm2" % vg_name,102                                utils.run("pvs").stdout)103        if loop_device is not None:104            loop_device = loop_device.group(1)105        result = utils.run("vgremove -f %s" % vg_name, ignore_status=True)106        if result.exit_status == 0:107            logging.info(result.stdout.rstrip())108        else:109            logging.debug("%s -> %s", result.command, result.stderr)110    if loop_device is not None:111        result = utils.run("pvremove -f %s" % loop_device, ignore_status=True)112        if result.exit_status == 0:113            logging.info(result.stdout.rstrip())114        else:115            logging.debug("%s -> %s", result.command, result.stderr)116        if loop_device in utils.run("losetup --all").stdout:117            ramdisk_filename = re.search("%s: \[\d+\]:\d+ \(([/\w]+)\)" % loop_device,118                                         utils.run("losetup --all").stdout)119            if ramdisk_filename is not None:120                ramdisk_filename = ramdisk_filename.group(1)121            for _ in range(10):122                time.sleep(0.1)123                result = utils.run("losetup -d %s" % loop_device, ignore_status=True)124                if "resource busy" not in result.stderr:125                    if result.exit_status == 0:126                        logging.info("Loop device %s deleted", loop_device)127                    else:128                        logging.debug("%s -> %s", result.command, result.stderr)129                    break130    if ramdisk_filename is not None:131        if os.path.exists(ramdisk_filename):132            os.unlink(ramdisk_filename)133            logging.info("Ramdisk filename %s deleted", ramdisk_filename)134            vg_ramdisk_dir = os.path.dirname(ramdisk_filename)135    if vg_ramdisk_dir is not None:136        if use_tmpfs:137            utils.run("umount %s" % vg_ramdisk_dir, ignore_status=True)138            if result.exit_status == 0:139                logging.info("Successfully unmounted tmpfs from %s", vg_ramdisk_dir)140            else:141                logging.debug("%s -> %s", result.command, result.stderr)142        if os.path.exists(vg_ramdisk_dir):143            try:144                shutil.rmtree(vg_ramdisk_dir)145                logging.info("Ramdisk directory %s deleted", vg_ramdisk_dir)146            except OSError:147                pass148def vg_check(vg_name):149    """150    Check whether provided volume group exists.151    """152    cmd = "vgdisplay %s" % vg_name153    try:154        utils.run(cmd)155        logging.debug("Provided volume group exists: %s", vg_name)156        return True157    except error.CmdError:158        return False159def vg_list():160    """161    List available volume groups.162    """163    cmd = "vgs --all"164    vgroups = {}165    result = utils.run(cmd)166    lines = result.stdout.strip().splitlines()167    if len(lines) > 1:168        columns = lines[0].split()169        lines = lines[1:]170    else:171        return vgroups172    for line in lines:173        details = line.split()174        details_dict = {}175        index = 0176        for column in columns:177            if re.search("VG", column):178                vg_name = details[index]179            else:180                details_dict[column] = details[index]181            index += 1182        vgroups[vg_name] = details_dict183    return vgroups184@error.context_aware185def vg_create(vg_name, pv_list, force=False):186    """187    Create a volume group by using the block special devices188    """189    error.context(190        "Creating volume group '%s' by using '%s'" %191        (vg_name, pv_list), logging.info)192    if vg_check(vg_name):193        raise error.TestError("Volume group '%s' already exist" % vg_name)194    if force:195        cmd = "vgcreate -f"196    else:197        cmd = "vgcreate"198    cmd += " %s %s" % (vg_name, pv_list)199    result = utils.run(cmd)200    logging.info(result.stdout.rstrip())201@error.context_aware202def vg_remove(vg_name):203    """204    Remove a volume group.205    """206    error.context("Removing volume '%s'" % vg_name, logging.info)207    if not vg_check(vg_name):208        raise error.TestError("Volume group '%s' could not be found" % vg_name)209    cmd = "vgremove -f %s" % vg_name210    result = utils.run(cmd)211    logging.info(result.stdout.rstrip())212def lv_list(vg_name):213    cmd = "lvs %s" % vg_name214    result = utils.run(cmd)215    logging.debug("Logical volumes in %s:\n%s", vg_name, result)216    lvpattern = r"(\w+)\s+%s" % vg_name217    return re.findall(lvpattern, result.stdout.rstrip())218def lv_check(vg_name, lv_name):219    """220    Check whether provided logical volume exists.221    """222    cmd = "lvdisplay %s" % vg_name223    result = utils.run(cmd, ignore_status=True)224    # unstable approach but currently works225    lvpattern = r"LV Name\s+%s\s+" % lv_name226    match = re.search(lvpattern, result.stdout.rstrip())227    if match:228        logging.debug("Provided logical volume %s exists in %s", lv_name, vg_name)229        return True230    else:231        return False232@error.context_aware233def lv_remove(vg_name, lv_name):234    """235    Remove a logical volume.236    """237    error.context("Removing volume /dev/%s/%s" %238                  (vg_name, lv_name), logging.debug)239    if not vg_check(vg_name):240        raise error.TestError("Volume group could not be found")241    if not lv_check(vg_name, lv_name):242        raise error.TestError("Logical volume could not be found")243    cmd = "lvremove -f %s/%s" % (vg_name, lv_name)244    result = utils.run(cmd)245    logging.info(result.stdout.rstrip())246@error.context_aware247def lv_create(vg_name, lv_name, lv_size):248    """249    Create a logical volume in a volume group.250    The volume group must already exist.251    """252    error.context("Creating original lv to take a snapshot from",253                  logging.debug)254    if not vg_check(vg_name):255        raise error.TestError("Volume group could not be found")256    if lv_check(vg_name, lv_name):257        raise error.TestError("Logical volume already exists")258    cmd = "lvcreate --size %s --name %s %s" % (lv_size, lv_name, vg_name)259    result = utils.run(cmd)260    logging.info(result.stdout.rstrip())261def lv_list_all():262    """263    List available group volumes.264    """265    cmd = "lvs --all"266    volumes = {}267    result = utils.run(cmd)268    lines = result.stdout.strip().splitlines()269    if len(lines) > 1:270        columns = lines[0].split()271        lines = lines[1:]272    else:273        return volumes274    for line in lines:275        details = line.split()276        length = len(details)277        details_dict = {}278        lv_name = details[0]279        details_dict["VG"] = details[1]280        details_dict["Attr"] = details[2]281        details_dict["LSize"] = details[3]282        if length == 5:283            details_dict["Origin_Data"] = details[4]284        elif length > 5:285            details_dict["Origin_Data"] = details[5]286            details_dict["Pool"] = details[4]287        volumes[lv_name] = details_dict288    return volumes289def thin_lv_create(vg_name, thinpool_name="lvthinpool", thinpool_size="1.5G",290                   thinlv_name="lvthin", thinlv_size="1G"):291    """292    Create a thin volume from given volume group.293    :param vg_name: An exist volume group294    :param thinpool_name: The name of thin pool295    :param thinpool_size: The size of thin pool to be created296    :param thinlv_name: The name of thin volume297    :param thinlv_size: The size of thin volume298    """299    tp_cmd = "lvcreate --thinpool %s --size %s %s" % (thinpool_name,300                                                      thinpool_size,301                                                      vg_name)302    try:303        utils.run(tp_cmd)304    except error.CmdError, detail:305        logging.debug(detail)306        raise error.TestError("Create thin volume pool failed.")307    logging.debug("Created thin volume pool: %s", thinpool_name)308    lv_cmd = ("lvcreate --name %s --virtualsize %s "309              "--thin %s/%s" % (thinlv_name, thinlv_size,310                                vg_name, thinpool_name))311    try:312        utils.run(lv_cmd)313    except error.CmdError, detail:314        logging.debug(detail)315        raise error.TestError("Create thin volume failed.")316    logging.debug("Created thin volume:%s", thinlv_name)317    return (thinpool_name, thinlv_name)318@error.context_aware319def lv_create_thin(vg_name, pool_name, lv_name, lv_size):320    """321    Create a thinly provisioned logical volume in a volume group.322    The volume group must already exist.323    """324    error.context("Creating original thin lv to take a snapshot from",325                  logging.debug)326    if not vg_check(vg_name):327        raise error.TestError("The volume group could not be found")328    if not lv_check(vg_name, pool_name):329        raise error.TestError("The thin pool could not be found")330    if lv_check(vg_name, lv_name):331        raise error.TestError("The logical volume already exists")332    cmd = "lvcreate --virtualsize %s --thin %s/%s --name %s" % (lv_size, vg_name,333                                                                pool_name, lv_name)334    result = utils.run(cmd)335    logging.info(result.stdout.rstrip())336@error.context_aware337def lv_take_snapshot(vg_name, lv_name,338                     lv_snapshot_name, lv_snapshot_size):339    """340    Take a snapshot of the original logical volume.341    """342    error.context("Taking a snapshot from original logical volume",343                  logging.debug)344    if not vg_check(vg_name):345        raise error.TestError("Volume group could not be found")346    if lv_check(vg_name, lv_snapshot_name):347        raise error.TestError("Snapshot already exists")348    if not lv_check(vg_name, lv_name):349        raise error.TestError("Snapshot's origin could not be found")350    cmd = ("lvcreate -s --name %s /dev/%s/%s --size %s" %351           (lv_snapshot_name, vg_name, lv_name, lv_snapshot_size))352    try:353        result = utils.run(cmd)354    except error.CmdError, ex:355        if ('Logical volume "%s" already exists in volume group "%s"' %356            (lv_snapshot_name, vg_name) in ex.result_obj.stderr and357            re.search(re.escape(lv_snapshot_name + " [active]"),358                      utils.run("lvdisplay").stdout)):359            # the above conditions detect if merge of snapshot was postponed360            logging.warning(("Logical volume %s is still active! " +361                             "Attempting to deactivate..."), lv_name)362            lv_reactivate(vg_name, lv_name)363            result = utils.run(cmd)364        else:365            raise ex366    logging.info(result.stdout.rstrip())367@error.context_aware368def lv_take_thin_snapshot(vg_name, lv_name, lv_snapshot_name):369    """370    Take a thinly provisioned snapshot of a thin logical volume.371    """372    error.context("Taking a thin snapshot from a thin logical volume",373                  logging.debug)374    if not vg_check(vg_name):375        raise error.TestError("Volume group could not be found")376    if lv_check(vg_name, lv_snapshot_name):377        raise error.TestError("Snapshot already exists")378    if not lv_check(vg_name, lv_name):379        raise error.TestError("Snapshot's origin could not be found")380    cmd = ("lvcreate -s --name %s /dev/%s/%s --ignoreactivationskip" %381           (lv_snapshot_name, vg_name, lv_name))382    # lvcreate -s --thinpool vg001/pool origin_volume --name mythinsnap383    result = utils.run(cmd)384    logging.info(result.stdout.rstrip())385@error.context_aware386def lv_take_thin_snapshot_from_external(vg_name, pool_name, lv_name, lv_snapshot_name):387    """388    Take a thinly provisioned snapshot of external logical volume.389    """390    error.context("Taking a thin snapshot from an external logical volume",391                  logging.debug)392    if not vg_check(vg_name):393        raise error.TestError("Volume group could not be found")394    if not lv_check(vg_name, pool_name):395        raise error.TestError("Snapshot's thin pool could not be found")396    if lv_check(vg_name, lv_snapshot_name):397        raise error.TestError("Snapshot already exists")398    if not lv_check(vg_name, lv_name):399        raise error.TestError("Snapshot's origin could not be found")400    cmd = ("lvcreate -s --thinpool %s/%s %s --name %s --ignoreactivationskip" %401           (vg_name, pool_name, lv_name, lv_snapshot_name))402    result = utils.run(cmd)403    logging.info(result.stdout.rstrip())404@error.context_aware405def lv_revert(vg_name, lv_name, lv_snapshot_name):406    """407    Revert the origin to a snapshot.408    """409    error.context("Reverting original logical volume to snapshot",410                  logging.debug)411    try:412        if not vg_check(vg_name):413            raise error.TestError("Volume group could not be found")414        if not lv_check(vg_name, lv_snapshot_name):415            raise error.TestError("Snapshot could not be found")416        if (not lv_check(vg_name, lv_snapshot_name) and not lv_check(vg_name,417                                                                     lv_name)):418            raise error.TestError("Snapshot and its origin could not be found")419        if (lv_check(vg_name, lv_snapshot_name) and not lv_check(vg_name,420                                                                 lv_name)):421            raise error.TestError("Snapshot origin could not be found")422        cmd = ("lvconvert --merge --interval 1 /dev/%s/%s" % (vg_name, lv_snapshot_name))423        result = utils.run(cmd)424        if (("Merging of snapshot %s will start next activation." %425             lv_snapshot_name) in result.stdout):426            raise error.TestError("The logical volume %s is still active" %...
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