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custominstall: write to temporary directory first, then move into place

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This commit is contained in:
Ian Burgwin
2020-12-02 21:12:06 -08:00
parent aad1accca3
commit 5d60715d94
1 changed files with 48 additions and 31 deletions
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75
custominstall.py
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@@ -5,13 +5,13 @@
# You can find the full license text in LICENSE.md in the root of this project. # You can find the full license text in LICENSE.md in the root of this project.
from argparse import ArgumentParser from argparse import ArgumentParser
from os import makedirs, scandir from os import makedirs, rename, scandir
from os.path import dirname, join, isdir, isfile from os.path import dirname, join, isdir, isfile
from random import randint from random import randint
from hashlib import sha256 from hashlib import sha256
from locale import getpreferredencoding from locale import getpreferredencoding
from pprint import pformat from pprint import pformat
from shutil import copyfile from shutil import copyfile, copy2, rmtree
import sys import sys
from sys import platform, executable from sys import platform, executable
from tempfile import TemporaryDirectory from tempfile import TemporaryDirectory
@@ -266,6 +266,9 @@ class CustomInstall:
self.event.on_cia_start(idx) self.event.on_cia_start(idx)
temp_title_root = join(self.sd, 'ci-install-temp-' + cia.tmd.title_id)
makedirs(temp_title_root, exist_ok=True)
tid_parts = (cia.tmd.title_id[0:8], cia.tmd.title_id[8:16]) tid_parts = (cia.tmd.title_id[0:8], cia.tmd.title_id[8:16])
try: try:
@@ -304,6 +307,9 @@ class CustomInstall:
cmd_id = len(cia.content_info) if is_dlc else 1 cmd_id = len(cia.content_info) if is_dlc else 1
cmd_filename = f'{cmd_id:08x}.cmd' cmd_filename = f'{cmd_id:08x}.cmd'
# this is where the final directory will be moved
tidhigh_root = join(sd_path, 'title', tid_parts[0])
# get the title root where all the contents will be # get the title root where all the contents will be
title_root = join(sd_path, 'title', *tid_parts) title_root = join(sd_path, 'title', *tid_parts)
content_root = join(title_root, 'content') content_root = join(title_root, 'content')
@@ -311,14 +317,16 @@ class CustomInstall:
title_root_cmd = f'/title/{"/".join(tid_parts)}' title_root_cmd = f'/title/{"/".join(tid_parts)}'
content_root_cmd = title_root_cmd + '/content' content_root_cmd = title_root_cmd + '/content'
temp_content_root = join(temp_title_root, 'content')
if not self.skip_contents: if not self.skip_contents:
makedirs(join(content_root, 'cmd'), exist_ok=True) makedirs(join(temp_content_root, 'cmd'), exist_ok=True)
if cia.tmd.save_size: if cia.tmd.save_size:
makedirs(join(title_root, 'data'), exist_ok=True) makedirs(join(temp_title_root, 'data'), exist_ok=True)
if is_dlc: if is_dlc:
# create the separate directories for every 256 contents # create the separate directories for every 256 contents
for x in range(((len(cia.content_info) - 1) // 256) + 1): for x in range(((len(cia.content_info) - 1) // 256) + 1):
makedirs(join(content_root, f'{x:08x}'), exist_ok=True) makedirs(join(temp_content_root, f'{x:08x}'), exist_ok=True)
# maybe this will be changed in the future # maybe this will be changed in the future
tmd_id = 0 tmd_id = 0
@@ -326,10 +334,10 @@ class CustomInstall:
tmd_filename = f'{tmd_id:08x}.tmd' tmd_filename = f'{tmd_id:08x}.tmd'
# write the tmd # write the tmd
enc_path = content_root_cmd + '/' + tmd_filename tmd_enc_path = content_root_cmd + '/' + tmd_filename
self.log(f'Writing {enc_path}...') self.log(f'Writing {tmd_enc_path}...')
with open(join(content_root, tmd_filename), 'wb') as o: with open(join(temp_content_root, tmd_filename), 'wb') as o:
with self.crypto.create_ctr_io(Keyslot.SD, o, self.crypto.sd_path_to_iv(enc_path)) as e: with self.crypto.create_ctr_io(Keyslot.SD, o, self.crypto.sd_path_to_iv(tmd_enc_path)) as e:
e.write(bytes(cia.tmd)) e.write(bytes(cia.tmd))
# write each content # write each content
@@ -337,34 +345,36 @@ class CustomInstall:
content_filename = co.id + '.app' content_filename = co.id + '.app'
if is_dlc: if is_dlc:
dir_index = format((co.cindex // 256), '08x') dir_index = format((co.cindex // 256), '08x')
enc_path = content_root_cmd + f'/{dir_index}/{content_filename}' content_enc_path = content_root_cmd + f'/{dir_index}/{content_filename}'
out_path = join(content_root, dir_index, content_filename) content_out_path = join(temp_content_root, dir_index, content_filename)
else: else:
enc_path = content_root_cmd + '/' + content_filename content_enc_path = content_root_cmd + '/' + content_filename
out_path = join(content_root, content_filename) content_out_path = join(temp_content_root, content_filename)
self.log(f'Writing {enc_path}...') self.log(f'Writing {content_enc_path}...')
with cia.open_raw_section(co.cindex) as s, open(out_path, 'wb') as o: with cia.open_raw_section(co.cindex) as s, open(content_out_path, 'wb') as o:
self.copy_with_progress(s, o, co.size, enc_path) self.copy_with_progress(s, o, co.size, content_enc_path)
# generate a blank save # generate a blank save
if cia.tmd.save_size: if cia.tmd.save_size:
enc_path = title_root_cmd + '/data/00000001.sav' sav_enc_path = title_root_cmd + '/data/00000001.sav'
out_path = join(title_root, 'data', '00000001.sav') tmp_sav_out_path = join(temp_title_root, 'data', '00000001.sav')
if self.overwrite_saves or not isfile(out_path): sav_out_path = join(title_root, 'data', '00000001.sav')
cipher = crypto.create_ctr_cipher(Keyslot.SD, crypto.sd_path_to_iv(enc_path)) if self.overwrite_saves or not isfile(sav_out_path):
cipher = crypto.create_ctr_cipher(Keyslot.SD, crypto.sd_path_to_iv(sav_enc_path))
# in a new save, the first 0x20 are all 00s. the rest can be random # in a new save, the first 0x20 are all 00s. the rest can be random
data = cipher.encrypt(b'\0' * 0x20) data = cipher.encrypt(b'\0' * 0x20)
self.log(f'Generating blank save at {enc_path}...') self.log(f'Generating blank save at {sav_enc_path}...')
with open(out_path, 'wb') as o: with open(tmp_sav_out_path, 'wb') as o:
o.write(data) o.write(data)
o.write(b'\0' * (cia.tmd.save_size - 0x20)) o.write(b'\0' * (cia.tmd.save_size - 0x20))
else: else:
self.log(f'Not overwriting existing save at {enc_path}') self.log(f'Copying original save file from {sav_enc_path}...')
copy2(sav_out_path, tmp_sav_out_path)
# generate and write cmd # generate and write cmd
enc_path = content_root_cmd + '/cmd/' + cmd_filename cmd_enc_path = content_root_cmd + '/cmd/' + cmd_filename
out_path = join(content_root, 'cmd', cmd_filename) cmd_out_path = join(temp_content_root, 'cmd', cmd_filename)
self.log(f'Generating {enc_path}') self.log(f'Generating {cmd_enc_path}')
highest_index = 0 highest_index = 0
content_ids = {} content_ids = {}
@@ -411,9 +421,9 @@ class CustomInstall:
final += b''.join(installed_ids) final += b''.join(installed_ids)
final += b''.join(cmacs) final += b''.join(cmacs)
cipher = crypto.create_ctr_cipher(Keyslot.SD, crypto.sd_path_to_iv(enc_path)) cipher = crypto.create_ctr_cipher(Keyslot.SD, crypto.sd_path_to_iv(cmd_enc_path))
self.log(f'Writing {enc_path}') self.log(f'Writing {cmd_enc_path}')
with open(out_path, 'wb') as o: with open(cmd_out_path, 'wb') as o:
o.write(cipher.encrypt(final)) o.write(cipher.encrypt(final))
# this starts building the title info entry # this starts building the title info entry
@@ -450,6 +460,13 @@ class CustomInstall:
b'\0' * 0x2c b'\0' * 0x2c
] ]
if isdir(title_root):
self.log(f'Removing original install at {title_root}...')
rmtree(title_root)
makedirs(tidhigh_root, exist_ok=True)
rename(temp_title_root, title_root)
title_info_entries[cia.tmd.title_id] = b''.join(title_info_entry_data) title_info_entries[cia.tmd.title_id] = b''.join(title_info_entry_data)
cifinish_data[int(cia.tmd.title_id, 16)] = {'seed': (get_seed(cia.contents[0].program_id) if cia.contents[0].flags.uses_seed else None)} cifinish_data[int(cia.tmd.title_id, 16)] = {'seed': (get_seed(cia.contents[0].program_id) if cia.contents[0].flags.uses_seed else None)}