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isoinfo.py
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isoinfo.py
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#
# Project Kimchi
#
# Copyright IBM Corp, 2015-2016
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
import contextlib
import glob
import os
import platform
import re
import stat
import struct
import sys
import urllib2
from wok.exception import IsoFormatError, OperationFailed
from wok.plugins.kimchi.utils import check_url_path
from wok.utils import wok_log
iso_dir = [
##
# Portions of this data from libosinfo: http://libosinfo.org/
#
# Each tuple has the following three members:
# Distro ID: Nickname for the distro or OS family
# Distro Version: A function or string that provides a specific version
# given a regular expression match on the volume id string
# Regular Expression: A regex to match against the ISO Volume ID
##
('openbsd', lambda m: m.group(2),
('OpenBSD/(i386|amd64) (\d+\.\d+) Install CD')),
('centos', lambda m: m.group(1),
('CentOS[ _](\d+\.?\d?)[ _].+')),
('windows', '2000',
('W2AFPP|SP1AFPP|SP2AFPP|YRMAFPP|ZRMAFPP|W2AOEM|SP1AOEM|SP2AOEM' +
'|YRMAOEM|ZRMAOEM|W2ASEL|SP2ASEL|W2SFPP|SP1SFPP|SP2SFPP|YRMSFPP' +
'|ZRMSFPP|W2SOEM|W2SOEM|SP1SOEM|SP2SOEM|YRMSOEM|ZRMSOEM|W2SSEL' +
'|SP2SSEL|W2PFPP|SP1PFPP|SP2PFPP|YRMPFPP|ZRMPFPP|W2POEM|SP1POEM' +
'|SP2POEM|YRMPOEM|ZRMPOEM|W2PSEL|SP2PSEL|W2PCCP|WIN2000|W2K_SP4')),
('windows', 'xp',
('WXPFPP|WXHFPP|WXPCCP|WXHCCP|WXPOEM|WXHOEM|WXPVOL|WXPEVL|XRMPFPP' +
'|XRMHFPP|XRMPCCP|XRMHCCP|XRMPOEM|XRMHOEM|XRMPVOL|XRMSD2|X1APFPP' +
'|X1AHFPP|X1APCCP|X1APCCP|X1AHCCP|X1APOEM|X1AHOEM|X1APVOL|VRMPFPP' +
'|VRMHFPP|VRMPCCP|VRMHCCP|VRMPOEM|VRMHOEM|VRMPVOL|VRMSD2|VX2PFPP' +
'|VX2HFPP|VX2PCCP|VX2HCCP|VX2POEM|VX2HOEM|VX2PRMFPP|VX2PVOL|GRTMUPD' +
'|GRTMPFPP|GRTMPRMFPP|GRTMHFPP|GRTMHKFPP|GRTMHKNFPP|GRTMHRMFPP' +
'|GRTMPOEM|GRTMHOEM|GRTMPVOL|GRTMPKNVOL|GRTMPKVOL|GRTMPRMVOL' +
'|MX2PFPP|MRMSD2|ARMPXFPP|ARMPXCCP|ARMPXOEM|ARMPXVOL|AX2PXCFPP' +
'|AX2PXFPP|NRMPIFPP')),
('windows', '2003',
('ARMECHK|ARMEVOL|ARMSVOL|ARMWVOL|ARMEEVL|ARMSEVL|ARMWEVL|ARMEOEM' +
'|ARMDOEM|ARMSOEM|ARMWOEM|ARMEFPP|ARMDFPP|ARMSFPP|ARMWFPP|NRMECHK' +
'|NRMEVOL|NRMSVOL|NRMWVOL|NRMEEVL|NRMSEVL|NRMWEVL|NRMEOEM|NRMDOEM' +
'|NRMSOEM|NRMWOEM|NRMEFPP|NRMDFPP|NRMSFPP|NRMSFPP|CRMSVOL|CRMSXVOL' +
'|BRMEVOL|BX2DVOL|ARMEEVL|BRMEEVL|CR0SP2|ARMEICHK|ARMEIFPP|ARMEIEVL' +
'|ARMEIOEM|ARMDIOEM|ARMEXFPP|ARMDFPP|ARMSXFPP|CR0SPX2|NRMEICHK' +
'|NRMEIFPP|NRMDIFPP|NRMEIOEM|NRMDIOEM|NRMEIVOL|NRMEIEVL|BRMEXVOL' +
'|BX2DXVOL|ARMEIFPP|CR0SPI2')),
('windows', '2003r2',
('CRMEFPP|CRMSFPP|CR0SCD2|CR0ECD2|BX2SFPP|BX2EFPP|BRMECD2FRE' +
'|BRMSCD2FRE|CRMEXFPP|CRMSXFPP|CR0SCD2X|CR0ECD2X|BX2SXFPP|BX2EXFPP' +
'|BRMECD2XFRE|BRMSCD2XFRE|CRMDVOL|CRMDXVOL')),
('windows', '2008',
('KRTMSVOL|KRTMSCHK|KRMWVOL|KRMSVOL|KRTMSXVOL|KRTMSXCHK|KRMWXVOL' +
'|KRMSXVOL')),
('windows', '2008r2',
('GRMSXVOL|GRMSXFRER|GRMSHXVOL|GRMSIAIVOL|SRVHPCR2')),
('windows', 'vista',
('FB1EVOL|LRMCFRE|FRTMBVOL|FRMBVOL|FRMEVOL|FB1EXVOL|LRMCXFRE' +
'|FRTMBXVOL|FRMBXVOL|FRMEXVOL|LRMEVOL|LRMEXVOL')),
('windows', '7',
('GRMCULFRER|GSP1RMCNPRFRER|GSP1RMCNULFRER|GSP1RMCULFRER' +
'|GSP1RMCPRFRER|GRMCENVOL|GRMCNENVOL|GRMCPRFRER|GSP1RMCPRVOL' +
'|GRMCULXFRER|GSP1RMCPRXFRER|GSP1RMCNHPXFRER|GRMCHPXFRER|GRMCXCHK' +
'|GSP1RMCENXVOL|GRMCENXVOL|GRMCNENXVOL|GRMCPRXFRER|GSP1RMCPRXVOL')),
('windows', '8',
('HB1_CCPA_X86FRE|HRM_CCSA_X86FRE|HRM_CCSA_X86CHK|HRM_CCSNA_X86CHK' +
'|HRM_CCSNA_X86FRE|HRM_CENA_X86FREV|HRM_CENA_X86CHKV' +
'|HRM_CENNA_X86FREV|HRM_CENNA_X86CHKV|HRM_CPRA_X86FREV' +
'|HRM_CPRNA_X86FREV|HB1_CCPA_X64FRE|HRM_CCSA_X64FRE' +
'|HRM_CCSA_X64CHK|HRM_CCSNA_X64FRE|HRM_CCSNA_X64CHK' +
'|HRM_CENNA_X64FREV|HRM_CENNA_X64CHKV|HRM_CENA_X64FREV' +
'|HRM_CENA_X64CHKV|HRM_CPRA_X64FREV|HRM_CPRNA_X64FREV')),
('sles', '10', 'SLES10|SUSE-Linux-Enterprise-Server.001'),
('sles', '11', 'SUSE_SLES-11-0-0|SLE-11'),
('sles', '12', 'SLE-12'),
('sles', lambda m: "11sp%s" % m.group(1), 'SLES-11-SP(\d+)'),
('opensuse', lambda m: m.group(1), 'openSUSE[ -](\d+\.\d+)'),
('opensuse', '11.1', 'SU1110.001'),
('opensuse', '11.3',
'openSUSE-DVD-i586-Build0702..001|openSUSE-DVD-x86_64.0702..001'),
('opensuse', '11.4',
'openSUSE-DVD-i586-Build0024|openSUSE-DVD-x86_640024'),
('opensuse', '12.1',
'openSUSE-DVD-i586-Build0039|openSUSE-DVD-x86_640039'),
('opensuse', '12.2',
'openSUSE-DVD-i586-Build0167|openSUSE-DVD-x86_640167'),
('opensuse', lambda m: m.group(1), 'openSUSE-Leap-(\d+\.\d+)'),
('rhel', '4.8', 'RHEL/4-U8'),
('rhel', lambda m: m.group(2), 'RHEL(-LE)?[_/-](\d+\.\d+)'),
('debian', lambda m: m.group(1), 'Debian (\d+\.\d+)'),
('ubuntu', lambda m: m.group(2), '[Uu]buntu(-Server)? (\d+\.\d+)'),
('fedora', lambda m: m.group(1), 'Fedora-WS-[\D-]+-(\d+)'),
('fedora', lambda m: m.group(1), 'Fedora-S-[\w-]+-(\d+)'),
('fedora', lambda m: m.group(1), 'Fedora[ -](\d+)'),
('fedora', lambda m: m.group(1), 'Fedora.*-(\d+)-'),
('gentoo', lambda m: m.group(1), 'Gentoo Linux \w+ (\d+)'),
('powerkvm', 'live_cd', 'POWERKVM_LIVECD'),
('arch', lambda m: m.group(1), 'ARCH_(\d+)'),
]
class IsoImage(object):
"""
Scan an iso9660 image to extract the Volume ID and check for boot-ability
ISO-9660 specification:
http://www.ecma-international.org/publications/standards/Ecma-119.htm
El-Torito specification:
http://download.intel.com/support/motherboards/desktop/sb/specscdrom.pdf
"""
SECTOR_SIZE = 2048
VOL_DESC = struct.Struct("=B5sBB32s32s")
EL_TORITO_BOOT_RECORD = struct.Struct("=B5sB32s32sI")
EL_TORITO_VALIDATION_ENTRY = struct.Struct("=BBH24sHBB")
EL_TORITO_BOOT_ENTRY = struct.Struct("=BBHBBHL20x")
# Path table info starting in ISO9660 offset 132. We force little
# endian byte order (the '<' sign) because Power systems can run on
# both.
# First int is path table size, next 4 bytes are discarded (it is
# the same info but in big endian) and next int is the location.
PATH_TABLE_SIZE_LOC = struct.Struct("<I 4s I")
def __init__(self, path):
self.path = path
self.remote = self._is_iso_remote()
self.volume_id = None
self.bootable = False
self._scan()
def _is_iso_remote(self):
if os.path.exists(self.path):
st_mode = os.stat(self.path).st_mode
if stat.S_ISREG(st_mode) or stat.S_ISBLK(st_mode):
return False
if check_url_path(self.path):
return True
raise IsoFormatError("KCHISO0001E", {'filename': self.path})
def probe(self):
if not self.bootable:
raise IsoFormatError("KCHISO0002E", {'filename': self.path})
matcher = Matcher(self.volume_id)
for d, v, regex in iso_dir:
if matcher.search(regex):
distro = d
if hasattr(v, '__call__'):
version = v(matcher)
else:
version = v
return (distro, version)
msg = "probe_iso: Unable to identify ISO %s with Volume ID: %s"
wok_log.debug(msg, self.path, self.volume_id)
return ('unknown', 'unknown')
def _unpack(self, s, data):
return s.unpack(data[:s.size])
def _scan_el_torito(self, data):
"""
Search the Volume Descriptor Table for an El Torito boot record. If
found, the boot record will provide a link to a boot catalogue. The
first entry in the boot catalogue is a validation entry. The next
entry contains the default boot entry. The default boot entry will
indicate whether the image is considered bootable.
"""
vd_type = -1
for i in xrange(1, 4):
fmt = IsoImage.EL_TORITO_BOOT_RECORD
ptr = i * IsoImage.SECTOR_SIZE
tmp_data = data[ptr:ptr + fmt.size]
if len(tmp_data) < fmt.size:
return
(vd_type, vd_ident, vd_ver,
et_ident, pad0, boot_cat) = self._unpack(fmt, tmp_data)
if vd_type == 255: # Volume record terminator
return
if vd_type == 0: # Found El-Torito Boot Record
break
if not et_ident.startswith('EL TORITO SPECIFICATION'):
raise IsoFormatError("KCHISO0003E",
{'filename': self.path})
offset = IsoImage.SECTOR_SIZE * boot_cat
size = IsoImage.EL_TORITO_VALIDATION_ENTRY.size + \
IsoImage.EL_TORITO_BOOT_ENTRY.size
data = self._get_iso_data(offset, size)
fmt = IsoImage.EL_TORITO_VALIDATION_ENTRY
tmp_data = data[0:fmt.size]
ptr = fmt.size
(hdr_id, platform_id, pad0,
ident, csum, key55, keyAA) = self._unpack(fmt, tmp_data)
if key55 != 0x55 or keyAA != 0xaa:
raise IsoFormatError("KCHISO0004E",
{'filename': self.path})
fmt = IsoImage.EL_TORITO_BOOT_ENTRY
tmp_data = data[ptr:ptr + fmt.size]
(boot, media_type, load_seg, sys_type,
pad0, sectors, load_rba) = self._unpack(fmt, tmp_data)
if boot == 0x88:
self.bootable = True
elif boot == 0:
self.bootable = False
else:
raise IsoFormatError("KCHISO0005E",
{'filename': self.path})
def _scan_ppc(self):
"""
PowerPC firmware does not use the conventional El Torito boot
specification. Instead, it looks for a file '/ppc/bootinfo.txt'
which contains boot information. A PPC image is bootable if
this file exists in the filesystem [1].
To detect if a PPC ISO is bootable, we could simply mount the
ISO and search for the boot file as we would with any other
file in the filesystem. We can also look for the boot file
searching byte by byte the ISO image. This is possible because
the PPC ISO image follows the ISO9660 standard [2]. Mounting
the ISO requires extra resources and it takes longer than
searching the image data, thus we chose the latter approach
in this code.
To locate a file we must access the Path Table, which contains
the records of all the directories in the ISO. After locating
the directory/subdirectory that contains the file, we access
the Directory Record to find it.
.. [1] https://www.ibm.com/developerworks/community/wikis/home?\
lang=en#!/wiki/W51a7ffcf4dfd_4b40_9d82_446ebc23c550/page/PowerLinux\
%20Boot%20howto
.. [2] http://wiki.osdev.org/ISO_9660
"""
# To locate any file we must access the Path Table, which
# contains the records of all the directories in the ISO.
# ISO9660 dictates that the Path Table location information
# is at offset 132, inside the Primary Volume Descriptor,
# after the SystemArea (16*SECTOR_SIZE).
#
# In the Path table info we're forcing little endian byte
# order (the '<' sign) because Power systems can run on
# both.
#
# First int is path table size, next 4 bytes are discarded (it is
# the same info but in big endian) and next int is the location.
PATH_TABLE_LOC_OFFSET = 16 * IsoImage.SECTOR_SIZE + 132
PATH_TABLE_SIZE_LOC = struct.Struct("<I 4s I")
path_table_loc_data = self._get_iso_data(PATH_TABLE_LOC_OFFSET,
PATH_TABLE_SIZE_LOC.size)
path_size, unused, path_loc = self._unpack(PATH_TABLE_SIZE_LOC,
path_table_loc_data)
# Fetch the Path Table using location and size found above
path_table_offset = path_loc * IsoImage.SECTOR_SIZE
path_table_data = self._get_iso_data(path_table_offset, path_size)
# Loop inside the path table to find the directory 'ppc'.
# The contents of the registers are:
# - length of the directory identifier (1 byte)
# - extended attribute record length (1 byte)
# - location of directory register (4 bytes)
# - directory number of parent dir (2 bytes)
# - directory name (size varies according to length)
# - padding field - 1 byte if the length is odd, not present if even
DIR_NAMELEN_LOCATION_PARENT = struct.Struct("<B B I H")
dir_struct_size = DIR_NAMELEN_LOCATION_PARENT.size
i = 0
while i < path_size:
dir_data = path_table_data[i: i+dir_struct_size]
i += dir_struct_size
# We won't use the Extended Attribute Record
dir_namelen, unused, dir_loc, dir_parent = \
self._unpack(DIR_NAMELEN_LOCATION_PARENT, dir_data)
if dir_parent == 1:
# read the dir name using the namelen
dir_name = path_table_data[i: i+dir_namelen].rstrip()
if dir_name.lower() == 'ppc':
# stop searching, dir was found
break
# Need to consider the optional padding field as well
i += dir_namelen + dir_namelen % 2
if i > path_size:
# Didn't find the '/ppc' directory. ISO is not bootable.
self.bootable = False
return
# Get the 'ppc' directory record using 'dir_loc'.
ppc_dir_offset = dir_loc * IsoImage.SECTOR_SIZE
# We need to find the sector size of this dir entry. The
# size of the File Section is located 10 bytes after
# the dir location.
DIR_SIZE_FMT = struct.Struct("<10sI")
data = self._get_iso_data(ppc_dir_offset, DIR_SIZE_FMT.size)
unused, dir_size = self._unpack(DIR_SIZE_FMT, data)
# If the dir is in the middle of a sector, the sector is
# padded zero and won't be utilized. We need to round up
# the result
dir_sectorsize = dir_size / IsoImage.SECTOR_SIZE
if dir_size % IsoImage.SECTOR_SIZE:
dir_sectorsize += 1
# Fixed-size directory record fields:
# - length of directory record (1 byte)
# - extended attr. record length (1 byte)
# - location of extend in both-endian format (8 bytes)
# - data length (size of extend) in both-endian (8 bytes)
# - recording date and time (7 bytes)
# - file flags (1 byte)
# - file unit size interleaved (1 byte)
# - interleave gap size (1 byte)
# - volume sequence number (4 bytes)
# - length of file identifier (1 byte)
#
# Of all these fields, we will use only 3 of them, 'ignoring'
# 30 bytes total.
STATIC_DIR_RECORD_FMT = struct.Struct("<B 24s B 6s B")
static_rec_size = STATIC_DIR_RECORD_FMT.size
# Maximum offset possible of all the records of this directory
DIR_REC_MAX = ppc_dir_offset + dir_sectorsize*IsoImage.SECTOR_SIZE
# Max size of a given directory record
MAX_DIR_SIZE = 255
# Name of the boot file
BOOT_FILE_NAME = "bootinfo.txt"
# Loop until one of the following happens:
# - boot file is found
# - end of directory record listing for the 'ppc' dir
while ppc_dir_offset < DIR_REC_MAX:
record_data = self._get_iso_data(ppc_dir_offset, MAX_DIR_SIZE)
dir_rec_len, unused, file_flags, unused2, file_name_len = \
self._unpack(STATIC_DIR_RECORD_FMT, record_data)
# if dir_rec_len = 0, increment offset (skip the
# dir_rec_len byte) and continue the loop
if dir_rec_len == 0:
ppc_dir_offset += 1
continue
# Get filename of the file/dir we're at.
filename = record_data[static_rec_size:
static_rec_size + file_name_len].rstrip()
# The second bit of the file_flags indicate if this record
# is a directory.
if BOOT_FILE_NAME in filename.lower() and (file_flags & 2) != 1:
self.bootable = True
return
# Update offset and keep looking. There is a padding here
# if the length of the file identifier is EVEN.
padding = 0
if not file_name_len % 2:
padding = 1
ppc_dir_offset += dir_rec_len + padding
# If reached this point the file wasn't found = not bootable
self.bootable = False
def _scan_s390x(self):
"""
s390x firmware does not use the conventional El Torito boot
specification. This method will be used to check s390x image
is bootable or not. Till then this will set bootable True.
"""
self.bootable = True
def _scan_primary_vol(self, data):
"""
Scan one sector for a Primary Volume Descriptor and extract the
Volume ID from the table
"""
primary_vol_data = data[0: -1]
info = self._unpack(IsoImage.VOL_DESC, primary_vol_data)
(vd_type, vd_ident, vd_ver, pad0, sys_id, vol_id) = info
if vd_type != 1:
raise IsoFormatError("KCHISO0006E", {'filename': self.path})
if vd_ident != 'CD001' or vd_ver != 1:
raise IsoFormatError("KCHISO0007E", {'filename': self.path})
if vol_id.strip() == 'RED_HAT':
# Some RHEL ISO images store the infomation of volume id in the
# location of volume set id mistakenly.
self.volume_id = self._get_volume_set_id(data)
else:
self.volume_id = vol_id
def _get_volume_set_id(self, data):
# The index is picked from ISO-9660 specification.
return data[190: 318]
def _get_iso_data(self, offset, size):
if self.remote:
try:
request = urllib2.Request(self.path)
range_header = "bytes=%d-%d" % (offset, offset + size - 1)
request.add_header("range", range_header)
with contextlib.closing(urllib2.urlopen(request)) as response:
data = response.read()
except urllib2.URLError as e:
raise OperationFailed("KCHISO0009E", {'err': e})
else:
with open(self.path) as fd:
fd.seek(offset)
data = fd.read(size)
return data
def _scan(self):
offset = 16 * IsoImage.SECTOR_SIZE
size = 4 * IsoImage.SECTOR_SIZE
data = self._get_iso_data(offset, size)
if len(data) < 2 * IsoImage.SECTOR_SIZE:
return
self._scan_primary_vol(data)
if platform.machine().startswith('ppc'):
self._scan_ppc()
elif platform.machine().startswith('s390x'):
self._scan_s390x()
else:
self._scan_el_torito(data)
class Matcher(object):
"""
Simple utility class to assist with matching a given string against a
series of regular expressions.
"""
def __init__(self, matchstring):
self.matchstring = matchstring
def search(self, regex):
self.lastmatch = re.search(regex, self.matchstring)
return bool(self.lastmatch)
def group(self, num):
return self.lastmatch.group(num)
def probe_iso(status_helper, params):
loc = params['path'].encode("utf-8")
updater = params['updater']
ignore = False
ignore_list = params.get('ignore_list', [])
def update_result(iso, ret):
path = os.path.abspath(iso) if os.path.isfile(iso) else iso
updater({'path': path, 'distro': ret[0], 'version': ret[1]})
if os.path.isdir(loc):
for root, dirs, files in os.walk(loc):
for dir_name in ignore_list:
if root in glob.glob(dir_name):
ignore = True
break
if ignore:
ignore = False
continue
for name in files:
if not name.lower().endswith('.iso'):
continue
iso = os.path.join(root, name)
try:
iso_img = IsoImage(iso)
ret = iso_img.probe()
update_result(iso, ret)
except:
continue
else:
iso_img = IsoImage(loc)
ret = iso_img.probe()
update_result(loc, ret)
if status_helper is not None:
status_helper('', True)
if __name__ == '__main__':
iso_list = []
def updater(iso_info):
iso_list.append(iso_info)
probe_iso(None, dict(path=sys.argv[1], updater=updater))
print iso_list