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LibrePilot/flight/Project/versionblob.py

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#!/usr/bin/env python
# Generate a version blob for
# the OpenPilot firmware.
#
# By E. Lafargue (c) 2011 E. Lafargue & the OpenPilot team
# Licence: GPLv3
#
###
# Usage:
# versionblob.py --append --firmware=<Firmware file name> --boardid=<Board code>
#
# append: if present, then append blob to firmware file directly, otherwise create "blob.bin"
# firmware: the filename of the firmware binary
# boardid: as a string, the board code, for example "0401" for CC board version 1.
# should match the codes in firmware description files.
#
# We have 100 bytes for the whole description.
#
# Only the first 40 are visible on the FirmwareIAP uavobject, the remaining
# 60 are ok to use for packaging and will be saved in the flash
#
# Structure is:
# 4 bytes: header: "OpFw"
# 4 bytes: GIT commit tag (short version of SHA1)
# 4 bytes: Unix timestamp of compile time
# 2 bytes: target platform. Should follow same rule as BOARD_TYPE and BOARD_REVISION in board define files.
# 26 bytes: commit tag if it is there, otherwise branch name. Zero-padded
# ---- 40 bytes limit ---
# 20 bytes: SHA1 sum of the firmware.
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# 40 bytes: free for now.
import binascii
import os
from time import time
import argparse
# Do the argument parsing:
parser = argparse.ArgumentParser(description='Generate firmware desciption blob')
parser.add_argument('--append', action='store_true')
parser.add_argument('--firmware', help='name of firmware binary file' , required=True)
parser.add_argument('--boardid', help='ID of board model, for example 0401 for CopterControl', required=True)
args = parser.parse_args()
print args
if args.append == True:
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print 'Appending description blob directly to ' + args.firmware
filename = args.firmware
file = open(filename,"ab")
else:
filename = 'blob.bin'
file = open(filename,"wb")
# Write the magic value:
file.write("OpFw")
# Get the short commit tag of the current git repository.
# Strip it to 8 characters for a 4 byte (int32) value.
# We have no full guarantee of unicity, but it is good enough
# with the rest of the information in the structure.
hs= os.popen('git rev-parse --short=8 HEAD').read().strip()
print "Version: " + hs
hb=binascii.a2b_hex(hs)
file.write(hb)
# Then the Unix time into a 32 bit integer:
print "Date: " + hex(int(time())).lstrip('0x')
hb = binascii.a2b_hex(hex(int(time())).lstrip('0x'))
file.write(hb)
# Then write board type and board revision
hb = binascii.a2b_hex(args.boardid)
file.write(hb)
# Last: a user-friendly description if it exists in GIT, otherwise
# just "unreleased"
hs = os.popen('git describe --exact-match').read()
if len(hs) == 0 :
print "Unreleased: get branch name instead"
hs = os.popen('git branch --contains HEAD').read()
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file.write(hs[0:26])
file.write("\0"*(26-len(hs)))
## Now we are at the 40 bytes mark.
## Add the 20 byte SHA1 hash of the firmware:
import hashlib
sha1 = hashlib.sha1()
with open('build/coptercontrol/CopterControl.bin','rb') as f:
for chunk in iter(lambda: f.read(8192), ''):
sha1.update(chunk)
file.write(sha1.digest())
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# Pad will null bytes:
file.write('\0'*40)
file.close()