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#!/usr/bin/env python3
# Copyright (C) 2020 Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
import os
import re
import sh
import sys
def usage(progname):
print("Usage:")
print(" {} dd [path/to/mmcblk0.img] <path/to/file.pit> "
"# Prints dd commands to extract the partitions".format(progname))
print(" {} redmine <path/to/file.pit> "
"# Prints a redmine table describing the partitions".format(progname))
sys.exit(1)
def get_human_size(size):
size_names = {
1024*1024 : 'GiB',
1024 : 'KiB',
}
if size == 0:
return '0'
elif size == None:
return None
for k, v in size_names.items():
if (size / k) < 1:
continue
elif size % k == 0:
return "{}{}".format((size / k), v)
return size
def generate_dd_commands(pit_data, input_file='mmcblk0'):
results = []
block_size = 512
for k, v in pit_data.items():
output_file = v.get('partition_name', None)
partition_location = v.get('partition_block_offset', None)
partition_size = v.get('partition_block_count', None)
if not output_file or not partition_location or not partition_size:
continue
results.append("# dd bs={} if={} of={} skip={} count={}".format(
block_size,
input_file,
output_file,
int (partition_location / 512),
int (partition_size / 512),
))
return os.linesep.join(results)
# TODO: also generate tables for mediawiki
def generate_redmine_table(pit_data):
results = ""
# Top header
results += "|_. PIT "
results += "|_. Linux name "
results += "|_. Block device "
results += "|_. Mount point "
results += "|_. Partition type "
results += "|._ Description "
results += "|_. size or size@location for 16G eMMC "
results += "|" + os.linesep
for k, v in pit_data.items():
results += "| {} ".format(v.get('partition_name', ''))
results += "| "
results += "| "
results += "| "
results += "| "
results += "| "
partition_size = get_human_size(v.get('partition_block_count', None))
partition_location = get_human_size(
v.get('partition_block_offset', None))
results += "| "
if partition_size:
results += "{}".format(partition_size)
if partition_location:
results += "@{}".format(partition_location)
results += "|" + os.linesep
return results
# TODO:
# - hook libpit instead
# - Handle and decode the following information:
# - Binary Type: 0 (AP)
# - Device Type: 2 (MMC)
# - Attributes: 5 (Read/Write)
# - Update Attributes: 5 (FOTA)
def parse_pit(pit_file_path):
results = {}
entry_nr = None
output = sh.heimdall('print-pit', '--file', pit_file_path)
for line in output.split(os.linesep):
found = re.search('^Entry Count: (.*)$', line)
if found:
nr_entries = int(found.group(1))
continue
found = re.search('^--- Entry #(.*) ---$', line)
if found:
entry_nr = int(found.group(1))
results[str(entry_nr)] = {}
continue
found = re.search('^Partition Block Size/Offset: (.*)$', line)
if found:
partition_block_offset = int(found.group(1)) * 512
results[str(entry_nr)]['partition_block_offset'] = \
partition_block_offset
continue
found = re.search('^Partition Block Count: (.*)$', line)
if found:
partition_block_count = int(found.group(1)) * 512
results[str(entry_nr)]['partition_block_count'] = \
partition_block_count
continue
found = re.search('^Partition Name: (.*)$', line)
if found:
partition_name = str(found.group(1))
results[str(entry_nr)]['partition_name'] = partition_name
continue
found = re.search('^Partition Name: (.*)$', line)
if found:
identifier = int(found.group(1))
results[str(entry_nr)]['identifier'] = identifier
continue
found = re.search('^Flash Filename: (.*)$', line)
if found:
flash_filename = str(found.group(1))
results[str(entry_nr)]['flash_filename'] = flash_filename
continue
found = re.search('^FOTA Filename: (.*)$', line)
if found:
fota_filename = str(found.group(1))
results[str(entry_nr)]['fota_filename'] = fota_filename
continue
found = re.search('^File Offset \(Obsolete\): (.*)$', line)
if found:
obsolete_file_offset = str(found.group(1))
results[str(entry_nr)]['obsolete_file_offset'] = \
obsolete_file_offset
continue
found = re.search('^File Size \(Obsolete\): (.*)$', line)
if found:
obsolete_file_size = str(found.group(1))
results[str(entry_nr)]['obsolete_file_size'] = \
obsolete_file_offset
continue
return results
if __name__ == "__main__":
if len(sys.argv) == 3 and sys.argv[1] == 'redmine':
pit_data = parse_pit(sys.argv[2])
print(generate_redmine_table(pit_data))
elif len(sys.argv) == 3 and sys.argv[1] == 'dd':
pit_data = parse_pit(sys.argv[2])
print(generate_dd_commands(pit_data))
elif len(sys.argv) == 4 and sys.argv[1] == 'dd':
pit_data = parse_pit(sys.argv[2])
mmcblk0_path = sys.argv[3]
print(generate_dd_commands(pit_data, mmcblk0_path))
else:
usage(sys.argv[0])
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