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# This file is part of cloud-init. See LICENSE file for license information.
import logging
import os
import re
from typing import NamedTuple, Optional
from cloudinit import performance, subp
from cloudinit.util import (
is_container,
is_DragonFlyBSD,
is_FreeBSD,
is_OpenBSD,
)
LOG = logging.getLogger(__name__)
# Path for DMI Data
DMI_SYS_PATH = "/sys/class/dmi/id"
class KernelNames(NamedTuple):
linux: str
freebsd: Optional[str]
openbsd: Optional[str]
# FreeBSD's kenv(1) and Linux /sys/class/dmi/id/* both use different names from
# dmidecode. The values are the same, and ultimately what we're interested in.
# Likewise, OpenBSD has the most commonly used things we need in sysctl(8)'s
# hw hierarchy. Moreover, this means it can be run without kern.allowkmem=1.
# These tools offer a "cheaper" way to access those values over dmidecode.
# This is our canonical translation table. If we add more tools on other
# platforms to find dmidecode's values, their keys need to be put in here.
DMIDECODE_TO_KERNEL = {
"baseboard-asset-tag": KernelNames(
"board_asset_tag", "smbios.planar.tag", None
),
"baseboard-manufacturer": KernelNames(
"board_vendor", "smbios.planar.maker", None
),
"baseboard-product-name": KernelNames(
"board_name", "smbios.planar.product", None
),
"baseboard-serial-number": KernelNames(
"board_serial", "smbios.planar.serial", None
),
"baseboard-version": KernelNames(
"board_version", "smbios.planar.version", None
),
"bios-release-date": KernelNames("bios_date", "smbios.bios.reldate", None),
"bios-vendor": KernelNames("bios_vendor", "smbios.bios.vendor", None),
"bios-version": KernelNames("bios_version", "smbios.bios.version", None),
"chassis-asset-tag": KernelNames(
"chassis_asset_tag", "smbios.chassis.tag", None
),
"chassis-manufacturer": KernelNames(
"chassis_vendor", "smbios.chassis.maker", "hw.vendor"
),
"chassis-serial-number": KernelNames(
"chassis_serial", "smbios.chassis.serial", "hw.uuid"
),
"chassis-version": KernelNames(
"chassis_version", "smbios.chassis.version", None
),
"system-manufacturer": KernelNames(
"sys_vendor", "smbios.system.maker", "hw.vendor"
),
"system-product-name": KernelNames(
"product_name", "smbios.system.product", "hw.product"
),
"system-serial-number": KernelNames(
"product_serial", "smbios.system.serial", "hw.uuid"
),
"system-uuid": KernelNames(
"product_uuid", "smbios.system.uuid", "hw.uuid"
),
"system-version": KernelNames(
"product_version", "smbios.system.version", None
),
}
def _read_dmi_syspath(key: str) -> Optional[str]:
"""
Reads dmi data from /sys/class/dmi/id
"""
kmap = DMIDECODE_TO_KERNEL.get(key)
if kmap is None or kmap.linux is None:
return None
dmi_key_path = "{0}/{1}".format(DMI_SYS_PATH, kmap.linux)
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 performance.Timed(f"Reading {dmi_key_path}"), 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 _read_kenv(key: str) -> Optional[str]:
"""
Reads dmi data from FreeBSD's kenv(1)
"""
kmap = DMIDECODE_TO_KERNEL.get(key)
if kmap is None or kmap.freebsd is None:
return None
LOG.debug("querying dmi data %s", kmap.freebsd)
try:
cmd = ["kenv", "-q", kmap.freebsd]
result = subp.subp(cmd).stdout.strip()
LOG.debug("kenv returned '%s' for '%s'", result, kmap.freebsd)
return result
except subp.ProcessExecutionError as e:
LOG.debug("failed kenv cmd: %s\n%s", cmd, e)
return None
def _read_sysctl(key: str) -> Optional[str]:
"""
Reads dmi data from OpenBSD's sysctl(8)
"""
kmap = DMIDECODE_TO_KERNEL.get(key)
if kmap is None or kmap.openbsd is None:
return None
LOG.debug("querying dmi data %s", kmap.openbsd)
try:
cmd = ["sysctl", "-qn", kmap.openbsd]
result = subp.subp(cmd).stdout.strip()
LOG.debug("sysctl returned '%s' for '%s'", result, kmap.openbsd)
return result
except subp.ProcessExecutionError as e:
LOG.debug("failed sysctl cmd: %s\n%s", cmd, e)
return None
def _call_dmidecode(key: str, dmidecode_path: str) -> Optional[str]:
"""
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 = subp.subp(cmd).stdout.strip()
LOG.debug("dmidecode returned '%s' for '%s'", result, key)
if result.replace(".", "") == "":
return ""
return result
except subp.ProcessExecutionError as e:
LOG.debug("failed dmidecode cmd: %s\n%s", cmd, e)
return None
def read_dmi_data(key: str) -> Optional[str]:
"""
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
if is_FreeBSD() or is_DragonFlyBSD():
return _read_kenv(key)
if is_OpenBSD():
return _read_sysctl(key)
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.debug("did not find either path %s or dmidecode command", DMI_SYS_PATH)
return None
def sub_dmi_vars(src: str) -> str:
"""Replace __dmi.VARNAME__ with DMI values from either sysfs or kenv."""
if "__" not in src:
return src
valid_dmi_keys = DMIDECODE_TO_KERNEL.keys()
for match in re.findall(r"__dmi\.([^_]+)__", src):
if match not in valid_dmi_keys:
LOG.warning(
"Ignoring invalid __dmi.%s__ in %s. Expected one of: %s.",
match,
src,
valid_dmi_keys,
)
continue
dmi_value = read_dmi_data(match)
if not dmi_value:
dmi_value = ""
LOG.debug(
"Replacing __dmi.%s__ in '%s' with '%s'.",
match,
src,
dmi_value,
)
src = src.replace(f"__dmi.{match}__", dmi_value)
return src