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# This file is part of cloud-init. See LICENSE file for license information.
from cloudinit import log as logging
from cloudinit import subp
from cloudinit.util import is_container
import os
LOG = logging.getLogger(__name__)
# Path for DMI Data
DMI_SYS_PATH = "/sys/class/dmi/id"
# dmidecode and /sys/class/dmi/id/* use different names for the same value,
# this allows us to refer to them by one canonical name
DMIDECODE_TO_DMI_SYS_MAPPING = {
'baseboard-asset-tag': 'board_asset_tag',
'baseboard-manufacturer': 'board_vendor',
'baseboard-product-name': 'board_name',
'baseboard-serial-number': 'board_serial',
'baseboard-version': 'board_version',
'bios-release-date': 'bios_date',
'bios-vendor': 'bios_vendor',
'bios-version': 'bios_version',
'chassis-asset-tag': 'chassis_asset_tag',
'chassis-manufacturer': 'chassis_vendor',
'chassis-serial-number': 'chassis_serial',
'chassis-version': 'chassis_version',
'system-manufacturer': 'sys_vendor',
'system-product-name': 'product_name',
'system-serial-number': 'product_serial',
'system-uuid': 'product_uuid',
'system-version': 'product_version',
}
def _read_dmi_syspath(key):
"""
Reads dmi data with from /sys/class/dmi/id
"""
if key not in DMIDECODE_TO_DMI_SYS_MAPPING:
return None
mapped_key = DMIDECODE_TO_DMI_SYS_MAPPING[key]
dmi_key_path = "{0}/{1}".format(DMI_SYS_PATH, mapped_key)
LOG.debug("querying dmi data %s", dmi_key_path)
if not os.path.exists(dmi_key_path):
LOG.debug("did not find %s", dmi_key_path)
return None
try:
with open(dmi_key_path, "rb") as fp:
key_data = fp.read()
except PermissionError:
LOG.debug("Could not read %s", dmi_key_path)
return None
# uninitialized dmi values show as all \xff and /sys appends a '\n'.
# in that event, return empty string.
if key_data == b'\xff' * (len(key_data) - 1) + b'\n':
key_data = b""
try:
return key_data.decode('utf8').strip()
except UnicodeDecodeError as e:
LOG.error("utf-8 decode of content (%s) in %s failed: %s",
dmi_key_path, key_data, e)
return None
def _call_dmidecode(key, dmidecode_path):
"""
Calls out to dmidecode to get the data out. This is mostly for supporting
OS's without /sys/class/dmi/id support.
"""
try:
cmd = [dmidecode_path, "--string", key]
(result, _err) = subp.subp(cmd)
result = result.strip()
LOG.debug("dmidecode returned '%s' for '%s'", result, key)
if result.replace(".", "") == "":
return ""
return result
except (IOError, OSError) as e:
LOG.debug('failed dmidecode cmd: %s\n%s', cmd, e)
return None
def read_dmi_data(key):
"""
Wrapper for reading DMI data.
If running in a container return None. This is because DMI data is
assumed to be not useful in a container as it does not represent the
container but rather the host.
This will do the following (returning the first that produces a
result):
1) Use a mapping to translate `key` from dmidecode naming to
sysfs naming and look in /sys/class/dmi/... for a value.
2) Use `key` as a sysfs key directly and look in /sys/class/dmi/...
3) Fall-back to passing `key` to `dmidecode --string`.
If all of the above fail to find a value, None will be returned.
"""
if is_container():
return None
syspath_value = _read_dmi_syspath(key)
if syspath_value is not None:
return syspath_value
def is_x86(arch):
return (arch == 'x86_64' or (arch[0] == 'i' and arch[2:] == '86'))
# running dmidecode can be problematic on some arches (LP: #1243287)
uname_arch = os.uname()[4]
if not (is_x86(uname_arch) or uname_arch in ('aarch64', 'amd64')):
LOG.debug("dmidata is not supported on %s", uname_arch)
return None
dmidecode_path = subp.which('dmidecode')
if dmidecode_path:
return _call_dmidecode(key, dmidecode_path)
LOG.warning("did not find either path %s or dmidecode command",
DMI_SYS_PATH)
return None
# vi: ts=4 expandtab
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