649 lines
22 KiB
Python
649 lines
22 KiB
Python
# Copyright 2015 Canonical, Ltd.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from concurrent import futures
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import fcntl
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import json
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import logging
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import os
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import struct
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import subprocess
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import sys
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import tty
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import urwid
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import yaml
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from subiquitycore.controller import RepeatedController
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from subiquitycore.signals import Signal
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from subiquitycore.prober import Prober
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from subiquitycore.ui.frame import SubiquityCoreUI
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log = logging.getLogger('subiquitycore.core')
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class Skip(Exception):
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"""Raise this from a controller's default method to skip a screen."""
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# From uapi/linux/kd.h:
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KDGKBTYPE = 0x4B33 # get keyboard type
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GIO_CMAP = 0x4B70 # gets colour palette on VGA+
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PIO_CMAP = 0x4B71 # sets colour palette on VGA+
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UO_R, UO_G, UO_B = 0xe9, 0x54, 0x20
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# /usr/include/linux/kd.h
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K_RAW = 0x00
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K_XLATE = 0x01
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K_MEDIUMRAW = 0x02
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K_UNICODE = 0x03
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K_OFF = 0x04
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KDGKBMODE = 0x4B44 # gets current keyboard mode
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KDSKBMODE = 0x4B45 # sets current keyboard mode
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class TwentyFourBitScreen(urwid.raw_display.Screen):
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def __init__(self, _urwid_name_to_rgb):
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self._urwid_name_to_rgb = _urwid_name_to_rgb
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super().__init__()
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def _cc(self, color):
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"""Return the "SGR" parameter for selecting color.
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See https://en.wikipedia.org/wiki/ANSI_escape_code#SGR for an
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explanation. We use the basic codes for black/white/default for
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maximum compatibility; they are the only colors used when the
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mono palette is selected.
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"""
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if color == 'white':
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return '7'
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elif color == 'black':
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return '0'
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elif color == 'default':
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return '9'
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else:
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# This is almost but not quite a ISO 8613-3 code -- that
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# would use colons to separate the rgb values instead. But
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# it's what xterm, and hence everything else, supports.
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return '8;2;{};{};{}'.format(*self._urwid_name_to_rgb[color])
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def _attrspec_to_escape(self, a):
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return '\x1b[0;3{};4{}m'.format(
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self._cc(a.foreground),
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self._cc(a.background))
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def is_linux_tty():
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try:
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r = fcntl.ioctl(sys.stdout.fileno(), KDGKBTYPE, ' ')
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except IOError as e:
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log.debug("KDGKBTYPE failed %r", e)
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return False
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log.debug("KDGKBTYPE returned %r, is_linux_tty %s", r, r == b'\x02')
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return r == b'\x02'
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urwid_8_names = (
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'black',
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'dark red',
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'dark green',
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'brown',
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'dark blue',
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'dark magenta',
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'dark cyan',
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'light gray',
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)
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def make_palette(colors, styles, ascii):
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"""Return a palette to be passed to MainLoop.
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colors is a list of exactly 8 tuples (name, (r, g, b))
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styles is a list of tuples (stylename, fg_color, bg_color) where
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fg_color and bg_color are defined in 'colors'
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"""
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# The part that makes this "fun" is that urwid insists on referring
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# to the basic colors by their "standard" names but we overwrite
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# these colors to mean different things. So we convert styles into
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# an urwid palette by mapping the names in colors to the standard
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# name.
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if len(colors) != 8:
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raise Exception(
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"make_palette must be passed a list of exactly 8 colors")
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urwid_name = dict(zip([c[0] for c in colors], urwid_8_names))
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urwid_palette = []
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for name, fg, bg in styles:
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urwid_fg, urwid_bg = urwid_name[fg], urwid_name[bg]
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if ascii:
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# 24bit grey on colored background looks good
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# but in 16 colors it's unreadable
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# hence add more contrast
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if urwid_bg != 'black':
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urwid_fg = 'black'
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# Only frame_button doesn't match above rule
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# fix it to be brown-on-black black-on-brown
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if name == 'frame_button focus':
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urwid_fg, urwid_bg = 'brown', 'black'
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urwid_palette.append((name, urwid_fg, urwid_bg))
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return urwid_palette
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def make_screen(colors, is_linux_tty, ascii_mode):
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"""Return a screen to be passed to MainLoop.
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colors is a list of exactly 8 tuples (name, (r, g, b)), the same as
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passed to make_palette.
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"""
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# On the linux console, we overwrite the first 8 colors to be those
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# defined by colors. Otherwise, we return a screen that uses ISO
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# 8613-3ish codes to display the colors.
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if len(colors) != 8:
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raise Exception(
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"make_screen must be passed a list of exactly 8 colors")
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if is_linux_tty:
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# Perhaps we ought to return a screen subclass that does this
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# ioctl-ing in .start() and undoes it in .stop() but well.
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curpal = bytearray(16*3)
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fcntl.ioctl(sys.stdout.fileno(), GIO_CMAP, curpal)
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for i in range(8):
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for j in range(3):
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curpal[i*3+j] = colors[i][1][j]
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fcntl.ioctl(sys.stdout.fileno(), PIO_CMAP, curpal)
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return urwid.raw_display.Screen()
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elif ascii_mode:
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return urwid.raw_display.Screen()
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else:
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_urwid_name_to_rgb = {}
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for i, n in enumerate(urwid_8_names):
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_urwid_name_to_rgb[n] = colors[i][1]
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return TwentyFourBitScreen(_urwid_name_to_rgb)
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def extend_dec_special_charmap():
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urwid.escape.DEC_SPECIAL_CHARMAP.update({
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ord('\N{BLACK RIGHT-POINTING SMALL TRIANGLE}'): '>',
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ord('\N{BLACK LEFT-POINTING SMALL TRIANGLE}'): '<',
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ord('\N{BLACK DOWN-POINTING SMALL TRIANGLE}'): 'v',
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ord('\N{BLACK UP-POINTING SMALL TRIANGLE}'): '^',
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ord('\N{check mark}'): '+',
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ord('\N{bullet}'): '*',
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ord('\N{lower half block}'): '=',
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ord('\N{upper half block}'): '=',
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ord('\N{FULL BLOCK}'): urwid.escape.DEC_SPECIAL_CHARMAP[
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ord('\N{BOX DRAWINGS LIGHT VERTICAL}')],
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})
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class KeyCodesFilter:
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"""input_filter that can pass (medium) raw keycodes to the application
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See http://lct.sourceforge.net/lct/x60.html for terminology.
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Call enter_keycodes_mode()/exit_keycodes_mode() to switch into and
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out of keycodes mode. In keycodes mode, the only events passed to
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the application are "press $N" / "release $N" where $N is the
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keycode the user pressed or released.
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Much of this is cribbed from the source of the "showkeys" utility.
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"""
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def __init__(self):
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self._fd = os.open("/proc/self/fd/0", os.O_RDWR)
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self.filtering = False
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def enter_keycodes_mode(self):
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log.debug("enter_keycodes_mode")
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self.filtering = True
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# Read the old keyboard mode (it will proably always be K_UNICODE but
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# well).
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o = bytearray(4)
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fcntl.ioctl(self._fd, KDGKBMODE, o)
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self._old_mode = struct.unpack('i', o)[0]
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# Set the keyboard mode to K_MEDIUMRAW, which causes the keyboard
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# driver in the kernel to pass us keycodes.
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fcntl.ioctl(self._fd, KDSKBMODE, K_MEDIUMRAW)
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def exit_keycodes_mode(self):
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log.debug("exit_keycodes_mode")
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self.filtering = False
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fcntl.ioctl(self._fd, KDSKBMODE, self._old_mode)
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def filter(self, keys, codes):
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# Luckily urwid passes us the raw results from read() we can
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# turn into keycodes.
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if self.filtering:
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i = 0
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r = []
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n = len(codes)
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while i < len(codes):
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# This is straight from showkeys.c.
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if codes[i] & 0x80:
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p = 'release '
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else:
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p = 'press '
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if i + 2 < n and (codes[i] & 0x7f) == 0:
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if (codes[i + 1] & 0x80) != 0:
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if (codes[i + 2] & 0x80) != 0:
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kc = (((codes[i + 1] & 0x7f) << 7) |
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(codes[i + 2] & 0x7f))
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i += 3
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else:
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kc = codes[i] & 0x7f
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i += 1
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r.append(p + str(kc))
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return r
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else:
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return keys
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class DummyKeycodesFilter:
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# A dummy implementation of the same interface as KeyCodesFilter
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# we can use when not running in a linux tty.
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def enter_keycodes_mode(self):
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pass
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def exit_keycodes_mode(self):
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pass
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def filter(self, keys, codes):
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return keys
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class Application(metaclass=urwid.MetaSignals):
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# A concrete subclass must set project and controllers attributes, e.g.:
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#
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# project = "subiquity"
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# controllers = [
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# "Welcome",
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# "Network",
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# "Filesystem",
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# "Identity",
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# "InstallProgress",
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# ]
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# The 'next-screen' and 'prev-screen' signals move through the list of
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# controllers in order, calling the default method on the controller
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# instance.
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make_ui = SubiquityCoreUI
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def __init__(self, opts):
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prober = Prober(opts)
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self.ui = self.make_ui()
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self.opts = opts
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opts.project = self.project
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self.root = '/'
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if opts.dry_run:
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self.root = '.subiquity'
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self.state_dir = os.path.join(self.root, 'run', self.project)
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os.makedirs(os.path.join(self.state_dir, 'states'), exist_ok=True)
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self.answers = {}
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if opts.answers is not None:
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self.answers = yaml.safe_load(opts.answers.read())
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log.debug("Loaded answers %s", self.answers)
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if not opts.dry_run:
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open('/run/casper-no-prompt', 'w').close()
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self.is_color = False
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self.color_palette = make_palette(self.COLORS, self.STYLES, opts.ascii)
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self.is_linux_tty = is_linux_tty()
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if self.is_linux_tty:
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self.input_filter = KeyCodesFilter()
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else:
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self.input_filter = DummyKeycodesFilter()
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self.scale_factor = float(
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os.environ.get('SUBIQUITY_REPLAY_TIMESCALE', "1"))
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self.updated = os.path.exists(os.path.join(self.state_dir, 'updating'))
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self.signal = Signal()
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self.prober = prober
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self.loop = None
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self.pool = futures.ThreadPoolExecutor(10)
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if opts.screens:
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self.controllers = [c for c in self.controllers
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if c in opts.screens]
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else:
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self.controllers = self.controllers[:]
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self.ui.progress_completion = len(self.controllers)
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self.controller_instances = dict.fromkeys(self.controllers)
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self.controller_index = -1
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@property
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def cur_controller(self):
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if self.controller_index < 0:
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return None
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controller_name = self.controllers[self.controller_index]
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return self.controller_instances[controller_name]
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def run_in_bg(self, func, callback):
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"""Run func() in a thread and call callback on UI thread.
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callback will be passed a concurrent.futures.Future containing
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the result of func(). The result of callback is discarded. An
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exception will crash the process so be careful!
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"""
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fut = self.pool.submit(func)
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def in_main_thread(ignored):
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self.loop.remove_watch_pipe(pipe)
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os.close(pipe)
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callback(fut)
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pipe = self.loop.watch_pipe(in_main_thread)
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def in_random_thread(ignored):
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os.write(pipe, b'x')
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fut.add_done_callback(in_random_thread)
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def run_command_in_foreground(self, cmd, before_hook=None, after_hook=None,
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**kw):
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screen = self.loop.screen
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# Calling screen.stop() sends the INPUT_DESCRIPTORS_CHANGED
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# signal. This calls _reset_input_descriptors() which calls
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# unhook_event_loop / hook_event_loop on the screen. But this all
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# happens before _started is set to False on the screen and so this
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# does not actually do anything -- we end up attempting to read from
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# stdin while in a background process group, something that gets the
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# kernel upset at us.
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#
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# The cleanest fix seems to be to just send the signal again once
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# stop() has returned which, now that screen._started is False,
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# correctly stops listening from stdin.
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#
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# There is an exactly analagous problem with screen.start() except
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# there the symptom is that we are running in the foreground but not
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# listening to stdin! The fix is the same.
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def run():
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subprocess.run(cmd, **kw)
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def restore(fut):
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screen.start()
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urwid.emit_signal(
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screen, urwid.display_common.INPUT_DESCRIPTORS_CHANGED)
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tty.setraw(0)
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if after_hook is not None:
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after_hook()
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screen.stop()
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urwid.emit_signal(
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screen, urwid.display_common.INPUT_DESCRIPTORS_CHANGED)
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if before_hook is not None:
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before_hook()
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self.run_in_bg(run, restore)
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def _connect_base_signals(self):
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"""Connect signals used in the core controller."""
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signals = [
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('quit', self.exit),
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('next-screen', self.next_screen),
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('prev-screen', self.prev_screen),
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]
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if self.opts.dry_run:
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signals.append(('control-x-quit', self.exit))
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self.signal.connect_signals(signals)
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# Registers signals from each controller
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for controller_class in self.controller_instances.values():
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controller_class.register_signals()
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log.debug("known signals: %s", self.signal.known_signals)
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def save_state(self):
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cur_controller = self.cur_controller
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if cur_controller is None:
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return
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state_path = os.path.join(
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self.state_dir, 'states', cur_controller._controller_name())
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with open(state_path, 'w') as fp:
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json.dump(cur_controller.serialize(), fp)
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def select_screen(self, index):
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if self.cur_controller is not None:
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self.cur_controller.end_ui()
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self.controller_index = index
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self.ui.progress_current = index
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log.debug(
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"moving to screen %s", self.cur_controller._controller_name())
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self.cur_controller.start_ui()
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state_path = os.path.join(self.state_dir, 'last-screen')
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with open(state_path, 'w') as fp:
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fp.write(self.cur_controller._controller_name())
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def next_screen(self, *args):
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self.save_state()
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while True:
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if self.controller_index == len(self.controllers) - 1:
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self.exit()
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try:
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self.select_screen(self.controller_index + 1)
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except Skip:
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controller_name = self.controllers[self.controller_index]
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log.debug("skipping screen %s", controller_name)
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continue
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else:
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return
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def prev_screen(self, *args):
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self.save_state()
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while True:
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if self.controller_index == 0:
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self.exit()
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try:
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self.select_screen(self.controller_index - 1)
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except Skip:
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controller_name = self.controllers[self.controller_index]
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log.debug("skipping screen %s", controller_name)
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continue
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else:
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return
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# EventLoop -------------------------------------------------------------------
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def exit(self):
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raise urwid.ExitMainLoop()
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def run_scripts(self, scripts):
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# run_scripts runs (or rather arranges to run, it's all async)
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# a series of python snippets in a helpful namespace. This is
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# all in aid of being able to test some part of the UI without
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# having to click the same buttons over and over again to get
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# the UI to the part you are working on.
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#
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# In the namespace are:
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# * everything from view_helpers
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# * wait, delay execution of subsequent scripts for a while
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# * c, a function that finds a button and clicks it. uses
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# wait, above to wait for the button to appear in case it
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# takes a while.
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from subiquitycore.testing import view_helpers
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class ScriptState:
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def __init__(self):
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self.ns = view_helpers.__dict__.copy()
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self.waiting = False
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self.wait_count = 0
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self.scripts = scripts
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ss = ScriptState()
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def _run_script(*args):
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log.debug("running %s", ss.scripts[0])
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exec(ss.scripts[0], ss.ns)
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if ss.waiting:
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return
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ss.scripts = ss.scripts[1:]
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if ss.scripts:
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self.loop.set_alarm_in(0.01, _run_script)
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def c(pat):
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but = view_helpers.find_button_matching(self.ui, '.*' + pat + '.*')
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if not but:
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ss.wait_count += 1
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if ss.wait_count > 10:
|
|
raise Exception("no button found matching %r after"
|
|
"waiting for 10 secs" % pat)
|
|
wait(1, func=lambda: c(pat))
|
|
return
|
|
ss.wait_count = 0
|
|
view_helpers.click(but)
|
|
|
|
def wait(delay, func=None):
|
|
ss.waiting = True
|
|
|
|
def next(loop, user_data):
|
|
ss.waiting = False
|
|
if func is not None:
|
|
func()
|
|
if not ss.waiting:
|
|
ss.scripts = ss.scripts[1:]
|
|
if ss.scripts:
|
|
_run_script()
|
|
self.loop.set_alarm_in(delay, next)
|
|
|
|
ss.ns['c'] = c
|
|
ss.ns['wait'] = wait
|
|
ss.ns['ui'] = self.ui
|
|
|
|
self.loop.set_alarm_in(0.06, _run_script)
|
|
|
|
def toggle_color(self):
|
|
if self.is_color:
|
|
new_palette = self.STYLES_MONO
|
|
self.is_color = False
|
|
else:
|
|
new_palette = self.color_palette
|
|
self.is_color = True
|
|
self.loop.screen.register_palette(new_palette)
|
|
self.loop.screen.clear()
|
|
|
|
def unhandled_input(self, key):
|
|
if key == 'ctrl x':
|
|
self.signal.emit_signal('control-x-quit')
|
|
elif key == 'f3':
|
|
self.loop.screen.clear()
|
|
elif key in ['ctrl t', 'f4']:
|
|
self.toggle_color()
|
|
|
|
def load_controllers(self):
|
|
log.debug("load_controllers")
|
|
controllers_mod = __import__(
|
|
'{}.controllers'.format(self.project), None, None, [''])
|
|
for i, k in enumerate(self.controllers):
|
|
if self.controller_instances[k] is None:
|
|
log.debug("Importing controller: {}".format(k))
|
|
klass = getattr(controllers_mod, k+"Controller")
|
|
self.controller_instances[k] = klass(self)
|
|
else:
|
|
count = 1
|
|
for k2 in self.controllers[:i]:
|
|
if k2 == k or k2.startswith(k + '-'):
|
|
count += 1
|
|
orig = self.controller_instances[k]
|
|
k += '-' + str(count)
|
|
self.controllers[i] = k
|
|
self.controller_instances[k] = RepeatedController(
|
|
orig, count)
|
|
log.debug("load_controllers done")
|
|
|
|
def load_serialized_state(self):
|
|
for k in self.controllers:
|
|
state_path = os.path.join(self.state_dir, 'states', k)
|
|
if not os.path.exists(state_path):
|
|
continue
|
|
with open(state_path) as fp:
|
|
self.controller_instances[k].deserialize(
|
|
json.load(fp))
|
|
|
|
last_screen = None
|
|
state_path = os.path.join(self.state_dir, 'last-screen')
|
|
if os.path.exists(state_path):
|
|
with open(state_path) as fp:
|
|
last_screen = fp.read().strip()
|
|
|
|
if last_screen in self.controllers:
|
|
return self.controllers.index(last_screen)
|
|
else:
|
|
return 0
|
|
|
|
def run(self):
|
|
log.debug("Application.run")
|
|
screen = make_screen(self.COLORS, self.is_linux_tty, self.opts.ascii)
|
|
|
|
self.loop = urwid.MainLoop(
|
|
self.ui, palette=self.color_palette, screen=screen,
|
|
handle_mouse=False, pop_ups=True,
|
|
input_filter=self.input_filter.filter,
|
|
unhandled_input=self.unhandled_input)
|
|
|
|
if self.opts.ascii:
|
|
urwid.util.set_encoding('ascii')
|
|
|
|
extend_dec_special_charmap()
|
|
|
|
self.toggle_color()
|
|
|
|
self.base_model = self.make_model()
|
|
try:
|
|
if self.opts.scripts:
|
|
self.run_scripts(self.opts.scripts)
|
|
|
|
self.load_controllers()
|
|
|
|
initial_controller_index = 0
|
|
|
|
if self.updated:
|
|
initial_controller_index = self.load_serialized_state()
|
|
|
|
def select_initial_screen(loop, index):
|
|
try:
|
|
self.select_screen(index)
|
|
except Skip:
|
|
self.next_screen()
|
|
|
|
self.loop.set_alarm_in(
|
|
0.00, lambda loop, ud: tty.setraw(0))
|
|
self.loop.set_alarm_in(
|
|
0.05, select_initial_screen, initial_controller_index)
|
|
self._connect_base_signals()
|
|
|
|
log.debug("starting controllers")
|
|
for k in self.controllers:
|
|
self.controller_instances[k].start()
|
|
log.debug("controllers started")
|
|
|
|
self.loop.run()
|
|
except Exception:
|
|
log.exception("Exception in controller.run():")
|
|
raise
|
|
finally:
|
|
# concurrent.futures.ThreadPoolExecutor tries to join all
|
|
# threads before exiting. We don't want that and this
|
|
# ghastly hack prevents it.
|
|
from concurrent.futures import thread
|
|
thread._threads_queues = {}
|