ranger_udisk_menu/menu.py

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#!/usr/bin/python3
# coding: utf-8
# License: The MIT License
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# Author: Alexander Lutsai <sl_ru@live.com>
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# Year: 2021
# Description: This script draws menu to choose, mount and unmount drives
import curses
import curses.ascii
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import subprocess
import json
import sys
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class ChoosePartition:
blkinfo = None
screen = None
selected_partn = 1
selected_mountpoint = None
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partn = 1
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help_message = ["Press 'm' to mount, 'u' to unmount, 'g' to refresh",
" and 'e' to unmount, 'p' to poweroff drive, 'enter' to cd"]
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message = ""
def __init__(self):
self.screen = curses.initscr()
curses.start_color()
curses.curs_set(0)
curses.noecho()
curses.cbreak()
self.screen.keypad(True)
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curses.init_pair(1, curses.COLOR_BLACK, curses.COLOR_WHITE)
self.selected_partn = 1
self._read_partitions()
def _read_partitions(self):
r = subprocess.check_output(['lsblk', '--all', '--json', '-O'])
r = r.decode().replace('0B,', '\"0B\",')
self.blkinfo = json.loads(r.encode())
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partn = 0
# filter for devices with children, none other are used by this script
# (this is not entirely correct, but goes beyond these lines)
self.blkinfo['blockdevices'] = [
bd
for bd in self.blkinfo['blockdevices']
if 'children' in bd]
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for bd in self.blkinfo['blockdevices']:
if 'children' not in bd:
continue
for part in bd['children']:
partn += 1
self.partn = partn
if self.selected_partn > self.partn:
self.selected_partn = self.partn
if self.selected_partn <= 0:
self.selected_partn = 1
def _get_part_by_partn(self):
partn = 0
for bd in self.blkinfo['blockdevices']:
if 'children' not in bd:
continue
for part in bd['children']:
partn += 1
if self.selected_partn == partn:
return part
return None
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def _get_drive_by_partn(self):
partn = 0
for bd in self.blkinfo['blockdevices']:
if 'children' not in bd:
continue
for part in bd['children']:
partn += 1
if self.selected_partn == partn:
return bd
return None
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def _select_print_part(self, part, is_selected, i):
if not ('mountpoint' in part and
'name' in part and
'size' in part):
raise Exception('Wrong lsblk json format.' +
'No mountpoint, name or size in the partition')
label = ""
label_fields = ['label', 'partlabel', 'parttypename', 'fstype']
for f in label_fields:
if f not in part:
continue
if part[f] is not None:
label = part[f]
break
mp = None
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if part['mountpoint'] is not None:
mp = part['mountpoint']
if is_selected:
self.selected_mountpoint = mp
if mp is None:
mp = "Not mounted"
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s = "{name:<12} {size:<8} {label:<16} {mp}".format(
name=part['name'] if part['name'] is not None else "None",
label=label if label is not None else "None",
size=part['size'] if part['size'] is not None else "None",
mp=mp
)
self.screen.addstr(2 + i, 4, s, curses.color_pair(is_selected))
def _select_print_block_device(self, bd, i):
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if not ('model' in bd and
'size' in bd or
'name' in bd):
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raise Exception('Wrong lsblk json format. ' +
'No model, size or name in blockdevice')
model = bd['model'] if bd['model'] is not None else ""
size = bd['size'] if bd['size'] is not None else ""
self.screen.addstr(2 + i, 2, bd['name'] + " " + model + " " + size)
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def _select_print(self, x):
self.screen.clear()
self.screen.border(0)
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self.screen.addstr(1, 2, self.help_message[0])
self.screen.addstr(2, 2, self.help_message[1])
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partn = 0
i = 0
if 'blockdevices' not in self.blkinfo:
raise Exception('Wrong lsblk json format. No field "blockdevices"')
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for bd in self.blkinfo['blockdevices']:
i += 1
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bd_selected = False
bd_i = i
self._select_print_block_device(bd, bd_i)
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if 'children' not in bd:
continue
for part in bd['children']:
i += 1
partn += 1
is_selected = 0 if self.selected_partn != partn else 1
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if is_selected:
bd_selected = True
self._select_print_part(part, is_selected, i)
if bd_selected:
self.screen.addstr(2 + bd_i, 1, ">")
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self.screen.addstr(2 + i + 2, 4, self.message)
def _eject_all(self):
blk = None
partn = 0
for bd in self.blkinfo['blockdevices']:
if 'children' not in bd:
continue
for part in bd['children']:
partn += 1
if self.selected_partn == partn:
blk = bd
if blk is None:
return
for part in blk['children']:
self.unmount(part)
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def select(self):
sel = None
x = 0
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# quit when pressed `q` or `Esc` or `Ctrl+g`
while x not in (ord('q'), curses.ascii.ESC,
curses.ascii.BEL, curses.ascii.NL):
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self._select_print(x)
x = self.screen.getch()
if x in (ord('j'), curses.ascii.SO, curses.KEY_DOWN):
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# down
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self.selected_partn += 1
if self.selected_partn > self.partn:
self.selected_partn = self.partn
elif x in (ord('k'), curses.ascii.DLE, curses.KEY_UP):
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# up
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self.selected_partn -= 1
if self.selected_partn <= 0:
self.selected_partn = 1
elif x == ord('e'):
sel = self._eject_all()
elif x == ord('m'):
sel = self._get_part_by_partn()
if sel is not None:
self.mount(sel)
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elif x == ord('u'):
sel = self._get_part_by_partn()
if sel is not None:
self.unmount(sel)
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elif x == ord('p'):
sel_drive = self._get_drive_by_partn()
if sel_drive is not None:
self.poweroff(sel_drive)
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elif x == ord('g') or x == ord('r'):
self._read_partitions()
curses.endwin()
if self.selected_mountpoint is not None and x == curses.ascii.NL:
return self.selected_mountpoint
return ""
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def _udisk_mount_unmount(self, cmd, dev):
r = ""
try:
r = subprocess.run(
['udisksctl', cmd, '-b', dev], capture_output=True)
r = (r.stdout.decode(encoding="utf-8") +
r.stderr.decode(encoding="utf-8"))
self.message = r
except Exception as e:
self.message = cmd + " error: " + r + str(e)
self._read_partitions()
def get_drive_path(self, drive):
if 'path' not in drive:
drive['path'] = '/dev/' + drive['kname']
return drive['path']
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def unmount(self, dev):
p = self.get_drive_path(dev)
self._udisk_mount_unmount("unmount", p)
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def poweroff(self, dev):
p = self.get_drive_path(dev)
self._udisk_mount_unmount("power-off", p)
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def mount(self, dev):
p = self.get_drive_path(dev)
self._udisk_mount_unmount("mount", p)
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if __name__ == "__main__":
cp = ChoosePartition()
sel = cp.select()
# print(sel)
# print(len(sys.argv))
if len(sys.argv) >= 2:
# print(sys.argv[1])
with open(sys.argv[1], 'w') as f:
f.write(sel)