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_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 _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')