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How to use lv_mount method in avocado

Best Python code snippet using avocado_python

lvm.py

Source:lvm.py

...81        params["lv_snapshot_name"] = params["get_state"]82        if mount_loc:83            # mount to avoid not-mounted errors84            try:85                lv_utils.lv_mount(params["vg_name"],86                                  params["lv_pointer_name"],87                                  mount_loc)88            except lv_utils.LVException:89                pass90            lv_utils.lv_umount(params["vg_name"],91                               params["lv_pointer_name"])92        try:93            logging.info("Restoring %s to state %s", vm_name, params["get_state"])94            lv_utils.lv_remove(params["vg_name"], params["lv_pointer_name"])95            lv_utils.lv_take_snapshot(params["vg_name"],96                                      params["lv_snapshot_name"],97                                      params["lv_pointer_name"])98        finally:99            if mount_loc:100                lv_utils.lv_mount(params["vg_name"],101                                  params["lv_pointer_name"],102                                  mount_loc)103    @classmethod104    def set(cls, params, object=None):105        """106        Store a state saving the current changes.107        All arguments match the base class.108        """109        vm_name = params["vms"]110        params["lv_snapshot_name"] = params["set_state"]111        logging.info("Taking a snapshot '%s' of %s", params["set_state"], vm_name)112        lv_utils.lv_take_snapshot(params["vg_name"],113                                  params["lv_pointer_name"],114                                  params["lv_snapshot_name"])115    @classmethod116    def unset(cls, params, object=None):117        """118        Remove a state with previous changes.119        All arguments match the base class and in addition:120        :raises: :py:class:`ValueError` if LV pointer state was used121        """122        vm_name = params["vms"]123        lv_pointer = params["lv_pointer_name"]124        if params["unset_state"] == lv_pointer:125            raise ValueError("Cannot unset built-in state '%s'" % lv_pointer)126        params["lv_snapshot_name"] = params["unset_state"]127        logging.info("Removing snapshot %s of %s", params["lv_snapshot_name"], vm_name)128        lv_utils.lv_remove(params["vg_name"], params["lv_snapshot_name"])129    @classmethod130    def check_root(cls, params, object=None):131        """132        Check whether a root state or essentially the object exists.133        All arguments match the base class.134        """135        vm_name = params["vms"]136        image_name = params["image_name"]137        logging.debug("Checking whether %s exists (root state requested)", vm_name)138        if lv_utils.lv_check(params["vg_name"], params["lv_name"]):139            logging.info("The required virtual machine %s's %s (%s) exists",140                         vm_name, image_name, params["lv_name"])141            return True142        else:143            logging.info("The required virtual machine %s's %s (%s) doesn't exist",144                         vm_name, image_name, params["lv_name"])145            return False146    @classmethod147    def set_root(cls, params, object=None):148        """149        Set a root state to provide object existence.150        All arguments match the base class.151        Create a disk, virtual group, thin pool and logical volume152        for each object.153        """154        vm_name = params["vms"]155        mount_loc = cls._get_image_mount_loc(params)156        logging.info("Creating original logical volume for %s", vm_name)157        vg_setup(params["vg_name"],158                 params["disk_vg_size"],159                 params["disk_basedir"],160                 params["disk_sparse_filename"],161                 params["use_tmpfs"] == "yes")162        lv_utils.lv_create(params["vg_name"],163                           params["lv_name"],164                           params["lv_size"],165                           # NOTE: call by key to keep good argument order which wasn't166                           # accepted upstream for backward API compatibility167                           pool_name=params["lv_pool_name"],168                           pool_size=params["lv_pool_size"])169        lv_utils.lv_take_snapshot(params["vg_name"],170                                  params["lv_name"],171                                  params["lv_pointer_name"])172        if mount_loc:173            if not os.path.exists(mount_loc):174                os.mkdir(mount_loc)175            lv_utils.lv_mount(params["vg_name"], params["lv_pointer_name"],176                              mount_loc, create_filesystem="ext4")177            # TODO: it is not correct for the LVM backend to expect QCOW2 images178            # but at the moment we have no better way to provide on states with179            # base image to take snapshots of180            super(LVMBackend, LVMBackend).set_root(params, object)181    @classmethod182    def unset_root(cls, params, object=None):183        """184        Unset a root state to prevent object existence.185        All arguments match the base class and in addition:186        :raises: :py:class:`exceptions.TestWarn` if permanent vm was detected187        Remove the disk, virtual group, thin pool and logical volume188        of each object.189        """190        vm_name = params["vms"]191        mount_loc = cls._get_image_mount_loc(params)192        logging.info("Removing original logical volume for %s", vm_name)193        try:194            if mount_loc:195                if lv_utils.vg_check(params["vg_name"]):196                    # mount to avoid not-mounted errors197                    try:198                        lv_utils.lv_mount(params["vg_name"],199                                          params["lv_pointer_name"],200                                          mount_loc)201                    except lv_utils.LVException:202                        pass203                    lv_utils.lv_umount(params["vg_name"],204                                       params["lv_pointer_name"])205                if os.path.exists(mount_loc):206                    try:207                        os.rmdir(mount_loc)208                    except OSError as ex:209                        logging.warning("No permanent vm can be removed automatically. If "210                                        "this is not a permanent test object, see the debug.")211                        raise exceptions.TestWarn("Permanent vm %s was detected but cannot be "212                                                  "removed automatically" % vm_name)...

lvsetup.py

Source:lvsetup.py

...133    def mount_unmount_lv(self):134        """135        Mounts and unmounts the filesystem on the logical volume.136        """137        lv_utils.lv_mount(self.vg_name, self.lv_name, self.mount_loc)138        lv_utils.lv_umount(self.vg_name, self.lv_name)139    @avocado.fail_on(lv_utils.LVException)140    def test(self):141        """142        A volume group with given name is created in the ramdisk. It then143        creates a logical volume, mounts and unmounts it.144        """145        self.create_lv()146        lv_utils.lv_mount(self.vg_name, self.lv_name, self.mount_loc,147                          create_filesystem=self.fs_name)148        lv_utils.lv_umount(self.vg_name, self.lv_name)149        self.mount_unmount_lv()150    @avocado.fail_on(lv_utils.LVException)151    def test_vg_reactivate(self):152        """153        Deactivate, export, import and activate a volume group.154        """155        self.create_lv()156        lv_utils.lv_mount(self.vg_name, self.lv_name, self.mount_loc,157                          create_filesystem=self.fs_name)158        lv_utils.lv_umount(self.vg_name, self.lv_name)159        lv_utils.vg_reactivate(self.vg_name, export=True)160        self.mount_unmount_lv()161    @avocado.fail_on(lv_utils.LVException)162    def test_lv_snapshot(self):163        """164        Takes a snapshot from the logical and merges snapshot with the165        logical volume.166        """167        self.create_lv()168        lv_utils.lv_mount(self.vg_name, self.lv_name, self.mount_loc,169                          create_filesystem=self.fs_name)170        lv_utils.lv_umount(self.vg_name, self.lv_name)171        lv_utils.lv_take_snapshot(self.vg_name, self.lv_name,172                                  self.lv_snap_name,173                                  self.lv_snapshot_size)174        lv_utils.lv_revert(self.vg_name, self.lv_name, self.lv_snap_name)175        self.mount_unmount_lv()176    def tearDown(self):177        """178        Cleans up loop device.179        """180        self.delete_lv()181        if not self.disk:182            disk.delete_loop_device(self.device)

uecbuild.py

Source:uecbuild.py

1#!/usr/bin/env python2import argparse3import os4import subprocess5import sys6import tempfile7DEFAULT_KERNEL = "kernels/maverick-server-uec-amd64-vmlinuz-virtual"8DEFAULT_IMAGE = "images/maverick-server-uec-amd64.img"9DOMAIN_EXISTS_ERROR = """Domain already exists (and could be running)! Manually shutdown and remove it with:10    virsh shutdown %(name)s (force with: virsh destroy %(name)s)11    virsh undefine %(name)s"""12def execute(args):13    with open(os.devnull, "r+") as f:14        subprocess.call(args, stdout=f, stderr=f)15def write_template(input_path, output_path, replacements):16    with open(input_path, "r") as input_file:17        with open(output_path, "w") as output_file:18            output_file.write(input_file.read() % replacements)19TTY_COLORS = {20	"blue":   34,21	"red":    31,22	"white":  39,23	"yellow": 33,24}25def tty_format(str, color="red", bold=True):26	tty_color = TTY_COLORS.get(color, TTY_COLORS["white"])27	tty_format = "1" if bold else "0"28	return "\033[%s;%sm%s\033[0m" % (tty_format, tty_color, str)29def log(msg):30	print(tty_format(msg, "blue", True))31def err(msg):32	print(tty_format(msg, "red", True))33# FIXME: Add global exception handler which prints exception value using err and stacktrace after that34if __name__ == "__main__":35    parser = argparse.ArgumentParser(36		description='Depoy Ubuntu UEC images to KVM/LVM based infrastructures',37		formatter_class=argparse.ArgumentDefaultsHelpFormatter38	)39    parser.add_argument('name', help='FQDN and identifier of domain')40    parser.add_argument('--vg', default='vms', help='name of LVM volume group')41    parser.add_argument('--size', default='5G', help='size of root partition, e.g., 1000M, 5G')42    parser.add_argument('--memory', default=1048576, help='size of RAM in bytes, e.g., 1048576, 2097152')43    parser.add_argument('--vcpus', default=2, help='number of virtual CPUs')44    parser.add_argument('--image', default=DEFAULT_IMAGE, help='reference root image file')45    parser.add_argument('--kernel', default=DEFAULT_KERNEL, help='kernel image to use')46    args = parser.parse_args()47    lv_path = os.path.join("/dev", args.vg, args.name)48    lv_mount = tempfile.mkdtemp("-uecbuild-%s-root" % args.name)49    base_dir = os.path.dirname(os.path.abspath(__file__))50    replacements = {51        "name": args.name,52        "memory": args.memory,53        "vcpus": args.vcpus,54        "kernel": os.path.join(base_dir, args.kernel),55        "lv_path": lv_path,56    }57    # check preconditions58    if os.getuid() != 0:59        raise Exception("Root privileges required")60    if os.path.exists(lv_path):61        raise Exception("LV already exists! Manually remove it with: umount %s; lvremove %s" % (lv_path, lv_path))62    if execute(["virsh", "domstate", args.name]) == 0:63        raise Exception(DOMAIN_EXISTS_ERROR % {"name": args.name})64    # create lv65    log("Creating LV at %s" % lv_path)66    execute(["lvcreate", "-n", args.name, "-L", args.size, args.vg])67    # copy root to lv68    log("Copying root image to LV")69    execute(["dd", "if=%s" % args.image, "of=%s" % lv_path, "bs=1M"])70    # check & resize lv71    log("Checking and resizing LV")72    execute(["e2fsck", "-f", lv_path])73    execute(["resize2fs", lv_path])74    # mount lv75    log("Mounting LV")76    execute(["mount", lv_path, lv_mount])77    # write hostname78    log("Writing hostname to LV's /etc/hostname")79    with open(os.path.join(lv_mount, "etc", "hostname"), "w") as f:80        f.write(args.name + "\n")81    82    # write user-data & meta-data83    log("Writing user-data & meta-data to LV")84    nocloud_dir = os.path.join(lv_mount, "var", "lib", "cloud", "data", "cache", "nocloud")85    os.makedirs(nocloud_dir)86    for template in ["user-data", "meta-data"]:87        write_template(88            input_path=os.path.join(base_dir, "templates", template),89            output_path=os.path.join(nocloud_dir, template),90            replacements=replacements91        )92    # unmount LV & remove tempdir93    log("Unmounting LV")94    execute(["umount", lv_mount])95    execute(["rmdir", lv_mount])96    97    # create domain xml98    log("Adding domain to libvirt")99    domain_xml = tempfile.mkstemp("-uecbuild-%s.xml" % args.name)100    write_template(101        input_path=os.path.join(base_dir, "templates", "domain.xml"),102        output_path=domain_xml[1],103        replacements=replacements104    )105    # define domain xml106    execute(["virsh", "define", domain_xml[1]])107    # remove domain xml108    os.remove(domain_xml[1])109    # start domain110    log("Starting domain %s" % args.name)...

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