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Current File : /proc/self/root/usr/lib64/python3.6/site-packages/pyanaconda/ui/gui/spokes/lib/resize.py
# Disk resizing dialog
#
# Copyright (C) 2012-2013  Red Hat, Inc.
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions of
# the GNU General Public License v.2, or (at your option) any later version.
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY expressed or implied, including the implied warranties of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
# Public License for more details.  You should have received a copy of the
# GNU General Public License along with this program; if not, write to the
# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.  Any Red Hat trademarks that are incorporated in the
# source code or documentation are not subject to the GNU General Public
# License and may only be used or replicated with the express permission of
# Red Hat, Inc.
#
from collections import namedtuple
from blivet.size import Size

from pyanaconda.core.i18n import _, C_, N_, P_
from pyanaconda.modules.common.constants.services import STORAGE
from pyanaconda.modules.common.structures.storage import OSData, DeviceData, DeviceFormatData
from pyanaconda.ui.gui import GUIObject
from pyanaconda.ui.gui.utils import blockedHandler, escape_markup, timed_action

import gi
gi.require_version("Gdk", "3.0")
gi.require_version("Gtk", "3.0")
from gi.repository import Gdk, Gtk

__all__ = ["ResizeDialog"]

DEVICE_NAME_COL = 0
DESCRIPTION_COL = 1
FILESYSTEM_COL = 2
RECLAIMABLE_COL = 3
ACTION_COL = 4
EDITABLE_COL = 5
TYPE_COL = 6
TOOLTIP_COL = 7
RESIZE_TARGET_COL = 8

TY_NORMAL = 0
TY_FREE_SPACE = 1
TY_PROTECTED = 2

PartStoreRow = namedtuple("PartStoreRow", ["name", "desc", "fs", "reclaimable",
                                           "action", "editable", "ty",
                                           "tooltip", "target"])

PRESERVE = N_("Preserve")
SHRINK = N_("Shrink")
DELETE = N_("Delete")
NOTHING = ""


class ResizeDialog(GUIObject):
    builderObjects = ["actionStore", "diskStore", "resizeDialog", "resizeAdjustment"]
    mainWidgetName = "resizeDialog"
    uiFile = "spokes/lib/resize.glade"

    def __init__(self, data, payload, partitioning, disks):
        super().__init__(data)
        self._disks = disks

        # Get the device tree.
        self._device_tree = STORAGE.get_proxy(
            partitioning.GetDeviceTree()
        )

        # Get roots of existing systems.
        self._roots = OSData.from_structure_list(
            self._device_tree.GetExistingSystems()
        )

        # Get the required device size.
        required_space = payload.space_required.get_bytes()
        required_size = self._device_tree.GetRequiredDeviceSize(required_space)

        self._required_size = Size(required_size)
        self._initial_free_space = Size(0)
        self._selected_reclaimable_space = Size(0)
        self._can_shrink_something = False

        self._disk_store = self.builder.get_object("diskStore")
        self._selection = self.builder.get_object("diskView-selection")
        self._view = self.builder.get_object("diskView")
        self._disk_store = self.builder.get_object("diskStore")
        self._reclaimable_label = self.builder.get_object("reclaimableSpaceLabel")
        self._selected_label = self.builder.get_object("selectedSpaceLabel")
        self._required_label = self.builder.get_object("requiredSpaceLabel")

        self._required_label.set_markup(
            _("Installation requires a total of <b>%s</b> for system data.")
            % escape_markup(str(self._required_size))
        )

        self._reclaim_desc_label = self.builder.get_object("reclaimDescLabel")
        self._resize_button = self.builder.get_object("resizeButton")
        self._preserve_button = self.builder.get_object("preserveButton")
        self._shrink_button = self.builder.get_object("shrinkButton")
        self._delete_button = self.builder.get_object("deleteButton")
        self._resize_slider = self.builder.get_object("resizeSlider")

    def _get_partition_description(self, device_data, format_data):
        # First, try to find the partition in some known root.
        # If we find it, return the mount point as the description.
        for root in self._roots:
            for mount_point, device_name in root.mount_points.items():
                if device_name == device_data.name:
                    return "{mount_point} ({os_name})".format(
                        mount_point=mount_point, os_name=root.os_name
                    )

        # Otherwise, fall back on increasingly vague information.
        if device_data.children:
            return device_data.children[0]

        if "label" in format_data.attrs:
            return format_data.attrs["label"]

        return format_data.description

    def _get_tooltip(self, device_data):
        if device_data.protected:
            return _("This device contains the installation source.")
        else:
            return None

    def populate(self, disks):
        self._initial_free_space = Size(0)
        self._selected_reclaimable_space = Size(0)
        self._can_shrink_something = False

        total_disks = 0
        total_reclaimable_space = Size(0)

        for disk_name in disks:
            disk_reclaimable_space = self._add_disk(disk_name)
            total_reclaimable_space += disk_reclaimable_space
            total_disks += 1

        self._update_labels(total_disks, total_reclaimable_space, 0)

        description = _(
            "You can remove existing file systems you no longer need to free up space for "
            "this installation.  Removing a file system will permanently delete all of the "
            "data it contains."
        )

        if self._can_shrink_something:
            description += "\n\n"
            description += _("There is also free space available in pre-existing file systems.  "
                             "While it's risky and we recommend you back up your data first, you "
                             "can recover that free disk space and make it available for this "
                             "installation below.")

        self._reclaim_desc_label.set_text(description)
        self._update_reclaim_button(Size(0))

    def _add_disk(self, device_name):
        # Get the device data.
        device_data = DeviceData.from_structure(
            self._device_tree.GetDeviceData(device_name)
        )
        format_data = DeviceFormatData.from_structure(
            self._device_tree.GetFormatData(device_name)
        )

        # First add the disk itself.
        is_partitioned = self._device_tree.IsDevicePartitioned(device_name)

        if is_partitioned:
            fs_type = ""
            disk_reclaimable_space = Size(0)
        else:
            fs_type = format_data.description
            disk_reclaimable_space = Size(device_data.size)

        description = "{} {}".format(
            Size(device_data.size).human_readable(max_places=1),
            device_data.description
        )

        itr = self._disk_store.append(None, [
            device_name,
            description,
            fs_type,
            "<span foreground='grey' style='italic'>%s total</span>",
            _(PRESERVE),
            not device_data.protected,
            TY_NORMAL,
            self._get_tooltip(device_data),
            int(device_data.size),
        ])

        # Then add all its partitions.
        partitions = self._device_tree.GetDevicePartitions(device_name)

        for child_name in partitions:
            free_size = self._add_partition(itr, child_name)
            disk_reclaimable_space += free_size

        # And then add another uneditable line that lists how much space is
        # already free in the disk.
        self._add_free_space(itr, device_name)

        # And then go back and fill in the total reclaimable space for the
        # disk, now that we know what each partition has reclaimable.
        self._disk_store[itr][RECLAIMABLE_COL] = \
            self._disk_store[itr][RECLAIMABLE_COL] % disk_reclaimable_space

        return disk_reclaimable_space

    def _add_partition(self, itr, device_name):
        # Get the device data.
        device_data = DeviceData.from_structure(
            self._device_tree.GetDeviceData(device_name)
        )
        format_data = DeviceFormatData.from_structure(
            self._device_tree.GetFormatData(device_name)
        )

        # Calculate the free size.
        # Devices that are not resizable are still deletable.
        is_resizable = self._device_tree.IsDeviceResizable(device_name)
        size_limits = self._device_tree.GetDeviceSizeLimits(device_name)

        min_size = Size(size_limits[0])
        device_size = Size(device_data.size)

        if is_resizable:
            free_size = device_size - min_size
            resize_string = _("%(freeSize)s of %(devSize)s") % {
                "freeSize": free_size.human_readable(max_places=1),
                "devSize": device_size.human_readable(max_places=1)
            }

            if not device_data.protected:
                self._can_shrink_something = True
        else:
            free_size = device_size
            resize_string = "<span foreground='grey'>%s</span>" % \
                            escape_markup(_("Not resizeable"))

        # Choose the type.
        if device_data.protected:
            ty = TY_PROTECTED
        else:
            ty = TY_NORMAL

        # Generate the description.
        description = self._get_partition_description(device_data, format_data)

        # Add a new row.
        self._disk_store.append(itr, [
            device_name,
            description,
            format_data.description,
            resize_string,
            _(PRESERVE),
            not device_data.protected,
            ty,
            self._get_tooltip(device_data),
            int(device_size),
        ])

        return free_size

    def _add_free_space(self, itr, device_name):
        # Calculate the free space.
        disk_free = Size(self._device_tree.GetDiskFreeSpace([device_name]))

        if disk_free < Size("1MiB"):
            return

        # Add a new row.
        free_space_string = "<span foreground='grey' style='italic'>{}</span>".format(
            escape_markup(_("Free space"))
        )

        disk_free_string = "<span foreground='grey' style='italic'>{}</span>".format(
            escape_markup(disk_free.human_readable(max_places=1))
        )

        self._disk_store.append(itr, [
            "",
            free_space_string,
            "",
            disk_free_string,
            NOTHING,
            False,
            TY_FREE_SPACE,
            None,
            disk_free,
        ])

        # Update the total free space.
        self._initial_free_space += disk_free

    def _update_labels(self, num_disks=None, total_reclaimable=None, selected_reclaimable=None):
        if num_disks is not None and total_reclaimable is not None:
            text = P_(
                "<b>%(count)s disk; %(size)s reclaimable space</b> (in file systems)",
                "<b>%(count)s disks; %(size)s reclaimable space</b> (in file systems)",
                num_disks
            ) % {
                "count": escape_markup(str(num_disks)),
                "size": escape_markup(total_reclaimable)
            }

            self._reclaimable_label.set_markup(text)

        if selected_reclaimable is not None:
            text = _("Total selected space to reclaim: <b>%s</b>") \
                   % escape_markup(selected_reclaimable)

            self._selected_label.set_markup(text)

    def _setup_slider(self, min_size, max_size, default_size):
        """Set up the slider for the given device.

        Set up the slider for this device, pulling out any previously given
        shrink value as the default.  This also sets up the ticks on the
        slider and keyboard support.  Any devices that are not resizable
        will not have a slider displayed, so they do not need to be worried
        with here.

        :param min_size: min value to set
        :type min_size: Size
        :param max_size: max value to set
        :type max_size: Size
        :param default_size: default value to set
        :type default_size: Size
        """
        # Convert the Sizes to ints
        min_size = int(min_size)
        max_size = int(max_size)
        default_value = int(default_size)

        # The slider needs to be keyboard-accessible.  We'll make small movements change in
        # 1% increments, and large movements in 5% increments.
        distance = max_size - min_size
        one_percent = int(distance / 100)
        five_percent = int(distance / 20)
        twenty_percent = int(distance / 5)

        with blockedHandler(self._resize_slider, self.on_resize_value_changed):
            self._resize_slider.set_range(min_size, max_size)

        self._resize_slider.set_value(default_value)

        adjustment = self.builder.get_object("resizeAdjustment")
        adjustment.configure(default_value, min_size, max_size, one_percent, five_percent, 0)

        # And then the slider needs a couple tick marks for easier navigation.
        self._resize_slider.clear_marks()
        for i in range(1, 5):
            self._resize_slider.add_mark(
                min_size + i * twenty_percent, Gtk.PositionType.BOTTOM, None
            )

        # Finally, add tick marks for the ends.
        self._resize_slider.add_mark(min_size, Gtk.PositionType.BOTTOM, str(Size(min_size)))
        self._resize_slider.add_mark(max_size, Gtk.PositionType.BOTTOM, str(Size(max_size)))

    def _update_action_buttons(self):
        # Update buttons for the selected row.
        itr = self._selection.get_selected()[1]

        if not itr:
            return

        row = self._disk_store[itr]
        obj = PartStoreRow(*row)

        self._preserve_button.set_sensitive(obj.editable)
        self._shrink_button.set_sensitive(obj.editable)
        self._delete_button.set_sensitive(obj.editable)
        self._resize_slider.set_visible(False)

        if not obj.editable:
            return

        device_name = obj.name
        device_data = DeviceData.from_structure(
            self._device_tree.GetDeviceData(device_name)
        )

        # If the selected filesystem does not support shrinking, make that
        # button insensitive.
        is_resizable = self._device_tree.IsDeviceResizable(device_name)
        self._shrink_button.set_sensitive(is_resizable)

        if is_resizable:
            min_size = self._device_tree.GetDeviceSizeLimits(device_name)[0]
            self._setup_slider(min_size, device_data.size, Size(obj.target))

        # Then, disable the button for whatever action is currently selected.
        # It doesn't make a lot of sense to allow clicking that.
        if obj.action == _(PRESERVE):
            self._preserve_button.set_sensitive(False)
        elif obj.action == _(SHRINK):
            self._shrink_button.set_sensitive(False)
            self._resize_slider.set_visible(True)
        elif obj.action == _(DELETE):
            self._delete_button.set_sensitive(False)

    def _update_reclaim_button(self, got):
        self._resize_button.set_sensitive(got + self._initial_free_space >= self._required_size)

    # pylint: disable=arguments-differ
    def refresh(self):
        super().refresh()

        # clear out the store and repopulate it from the devicetree
        self._disk_store.clear()
        self.populate(self._disks)

        self._view.expand_all()

    def run(self):
        rc = self.window.run()
        self.window.destroy()
        return rc

    # Signal handlers.
    def on_key_pressed(self, window, event, *args):
        # Handle any keyboard events.  Right now this is just delete for
        # removing a partition, but it could include more later.
        if not event or event and event.type != Gdk.EventType.KEY_RELEASE:
            return

        if event.keyval == Gdk.KEY_Delete and self._delete_button.get_sensitive():
            self._delete_button.emit("clicked")

    def _sum_reclaimable_space(self, model, path, itr, *args):
        obj = PartStoreRow(*model[itr])

        if not obj.name:
            return False

        device_name = obj.name
        is_partitioned = self._device_tree.IsDevicePartitioned(device_name)

        if is_partitioned:
            return False

        device_data = DeviceData.from_structure(
            self._device_tree.GetDeviceData(device_name)
        )

        if obj.action == _(PRESERVE):
            return False
        elif obj.action == _(SHRINK):
            self._selected_reclaimable_space += Size(device_data.size) - Size(obj.target)
        elif obj.action == _(DELETE):
            self._selected_reclaimable_space += Size(device_data.size)

        return False

    def on_preserve_clicked(self, button):
        itr = self._selection.get_selected()[1]
        self._on_action_changed(itr, PRESERVE)

    def on_shrink_clicked(self, button):
        itr = self._selection.get_selected()[1]
        self._on_action_changed(itr, SHRINK)

    def on_delete_clicked(self, button):
        itr = self._selection.get_selected()[1]
        self._on_action_changed(itr, DELETE)

    def _on_action_changed(self, itr, new_action):
        if not itr:
            return

        # Handle the row selected when a button was pressed.
        selected_row = self._disk_store[itr]
        selected_row[ACTION_COL] = _(new_action)

        # If that row is a disk header, we need to process all the partitions
        # it contains.
        device_name = selected_row[DEVICE_NAME_COL]
        is_partitioned = self._device_tree.IsDevicePartitioned(device_name)

        if is_partitioned:
            part_itr = self._disk_store.iter_children(itr)

            while part_itr:
                # Immutable entries are those that we can't do anything to - like
                # the free space lines.  We just want to leave them in the display
                # for information, but you can't choose to preserve/delete/shrink
                # them.
                if self._disk_store[part_itr][TYPE_COL] in [TY_FREE_SPACE, TY_PROTECTED]:
                    part_itr = self._disk_store.iter_next(part_itr)
                    continue

                self._disk_store[part_itr][ACTION_COL] = _(new_action)

                # If the user marked a whole disk for deletion, they can't go in and
                # un-delete partitions under it.
                if new_action == DELETE:
                    self._disk_store[part_itr][EDITABLE_COL] = False
                elif new_action == PRESERVE:
                    part_name = self._disk_store[part_itr][DEVICE_NAME_COL]
                    part_data = DeviceData.from_structure(
                        self._device_tree.GetDeviceData(part_name)
                    )
                    self._disk_store[part_itr][EDITABLE_COL] = not part_data.protected

                part_itr = self._disk_store.iter_next(part_itr)

        # And then we're keeping a running tally of how much space the user
        # has selected to reclaim, so reflect that in the UI.
        self._selected_reclaimable_space = Size(0)
        self._disk_store.foreach(self._sum_reclaimable_space, None)
        self._update_labels(selected_reclaimable=self._selected_reclaimable_space)
        self._update_reclaim_button(self._selected_reclaimable_space)
        self._update_action_buttons()

    def _schedule_actions(self, model, path, itr, *args):
        obj = PartStoreRow(*model[itr])

        if not obj.name:
            return False

        if not obj.editable:
            return False

        if obj.action == _(PRESERVE):
            pass
        elif obj.action == _(SHRINK):
            self._device_tree.ShrinkDevice(obj.name, obj.target)
        elif obj.action == _(DELETE):
            self._device_tree.RemoveDevice(obj.name)

        return False

    def on_resize_clicked(self, *args):
        self._disk_store.foreach(self._schedule_actions, None)

    def on_delete_all_clicked(self, button, *args):
        if button.get_label() == C_("GUI|Reclaim Dialog", "Delete _all"):
            action = DELETE
            button.set_label(C_("GUI|Reclaim Dialog", "Preserve _all"))
        else:
            action = PRESERVE
            button.set_label(C_("GUI|Reclaim Dialog", "Delete _all"))

        itr = self._disk_store.get_iter_first()
        while itr:
            obj = PartStoreRow(*self._disk_store[itr])
            if not obj.editable:
                itr = self._disk_store.iter_next(itr)
                continue

            device_name = obj.name
            device_data = DeviceData.from_structure(
                self._device_tree.GetDeviceData(device_name)
            )

            if device_data.is_disk:
                self._on_action_changed(itr, action)

            itr = self._disk_store.iter_next(itr)

    def on_row_clicked(self, view, path, column):
        # This handles when the user clicks on a row in the view.  We use it
        # only for expanding/collapsing disk headers.
        if view.row_expanded(path):
            view.collapse_row(path)
        else:
            view.expand_row(path, True)

    def on_selection_changed(self, selection):
        # This handles when the selection changes.  It's very similar to what
        # on_row_clicked above does, but this handler only deals with changes in
        # selection.  Thus, clicking on a disk header to collapse it and then
        # immediately clicking on it again to expand it would not work when
        # dealt with here.
        self._update_action_buttons()

    @timed_action(delay=200, threshold=500, busy_cursor=False)
    def on_resize_value_changed(self, rng):
        (model, itr) = self._selection.get_selected()

        old_delta = Size(rng.get_adjustment().get_upper()) - int(model[itr][RESIZE_TARGET_COL])
        self._selected_reclaimable_space -= old_delta

        # Update the target size in the store.
        model[itr][RESIZE_TARGET_COL] = Size(rng.get_value())

        # Update the "Total selected space" label.
        delta = Size(rng.get_adjustment().get_upper()) - int(rng.get_value())
        self._selected_reclaimable_space += delta
        self._update_labels(selected_reclaimable=self._selected_reclaimable_space)

        # And then the reclaim button, in case they've made enough space.
        self._update_reclaim_button(self._selected_reclaimable_space)

    def resize_slider_format(self, scale, value):
        # This makes the value displayed under the slider prettier than just a
        # single number.
        return str(Size(value))

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