File: android-deltas-scripts/

#!/usr/bin/env python3  <= fails in Termux:Widget (see also _etc shims)
Sync Changes to Phone, Part 2: Phone

Run syncs whenever desired to propagate PC changes to the phone.  
The phone will be updated only for modifications made on the PC.

Run this on your phone second (after running Part 1 on your PC), with:


Run this from the Termux app's console, or any other app with a 
console terminal.  This file may also be run with no command line 
from a Python IDE app (e.g., Pydroid 3 or QPython), and/or a 
home-screen shortcut or widget (e.g., Termux:Widget).

Run this from any folder.  It uses paths set in,
and finds that and in its own folder automatically.

Step runtimes are shown in the console after step completion.  
Step outputs go to files in LOGS; watch with 'tail -f LOGS/file'.

See _README.html for license, attribution, version, and docs.

Dev notes:

1) Heritage: this is a Python translation of a same-named Bash 
script in folder _etc/bash-version/; hence the too-many globals.
Translated for Windows portability: Cygwin and WSL have seams.
The Bash originals more explicitly show command lines run here.

import os, sys, shutil
from os.path import join

import config_phone, common             # get phone settings and common code 
common.startup(config_phone, common)    # copy and use phone config's settings
from common import *                    # use both's top-level names as globals

# subjects
thezip = join(FROM, '')       # where user copies zipfile on phone
thedlt = join(FROM, 'DELTAS')           # what the unzip creates on phone
thedst = join(TO,   STUFF)              # where deltas are applied on phone

# 'to' must exist here
if not os.path.isdir(thedst):
    print('The TO/STUFF folder does not exist: "%s"' % thedst)
    print('Exiting; please check the config file and rerun.')

opener('Syncing:\nfrom %s\nto   %s\nlogs %s' % (thezip, thedst, LOGS))

# 1) Copy deltas zip from proxy to phone with an explorer app

# Choose your app (but not Termux: POSIX cannot access USB in 11)

msg = """
Manually copy or move
    from the root of the USB drive
    to   %s
using any Android file-explorer app with suitable storage permissions.
""" % FROM

input('Press enter/return here when the copy is finished...')

# did the copy work?
if not os.path.exists(thezip):
    print('Deltas zip not found at "%s"' % thezip)
    print('Please rerun this script to try again.')

# 2) Unzip deltas on phone with [] in Termux

announce('Unzipping deltas on phone')
logto = join(LOGS, '%s--sync-1-unzip-deltas-log.txt' % DATE)

# for a deltas tree not deleted by last run: delete, iff approved
removeExistingOrStop(thedlt, 'phone (DELTAS)')

# perms may disable updates in app-specific storage
permissions = ('-permissions',) if UnixPermissions else ()

runpy(join(ZIP, ''), 
      thezip, FROM, *permissions,            # makes FROM/DELTAS == thedlt
      tailing=(1, 'Zip extract summary'))

# 3) Apply deltas to phone with [ -restore] in Termux

announce('Applying deltas to phone')
logto = join(LOGS, '%s--sync-2-apply-deltas-log.txt' % DATE)

# backup phone changes? (__bkp__ prunes slow in shared storage)
backup = ('-backup',) if BackupChanges else ()

runpy(join(MALL, ''),
      thedlt, thedst, '-restore', '-auto', '-skipcruft', *backup, '-quiet',
      tailing=(9, 'Mergeall summary'))

# 4) Cleanup deltas zip and folder on phone in Termux

print('Removing deltas folder from phone')
timefunc(lambda: shutil.rmtree(thedlt, onerror=rmtreeworkaround))

# on-phone zip; user may have copied or moved the proxy zip, but can't check here

print('Removing deltas zip from phone (remove manually from proxy as needed)')
timefunc(lambda: os.remove(thezip)) 

# Configurable: hook for custom post-propagate steps

import z_postcopy_hook_phone    # no need for runpy() in __file__ here

closer('See logs in "%s".' % LOGS)

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