"""Get information from os-release."""
import os
OS_RELEASE_FILENAME = "/var/lib/snapd/hostfs/etc/os-release"
OS_RELEASE_FILENAME_FALLBACK = "/etc/os-release"
OS_RELEASE_FILENAME_SECONDARY_FALLBACK = "/usr/lib/os-release"
OS_RELEASE_FILE_KEYS = {
"NAME": "distributor-id",
"PRETTY_NAME": "description",
"VERSION_ID": "release",
"VERSION_CODENAME": "code-name",
}
def get_os_filename():
"""
Provide the appropriate file for os release info.
If a snap, we want the host os so need to use
/var/lib/snapd/hostfs/etc/os-release, if not a snap
/etc/os-release will be used as first fallback or
/usr/lib/os-release as a fallback as indicated in os-release
at Freedesktop.org
"""
os_filename = OS_RELEASE_FILENAME
if not os.path.exists(os_filename) or not os.access(
os_filename,
os.R_OK,
):
os_filename = OS_RELEASE_FILENAME_FALLBACK
if not os.path.exists(os_filename) or not os.access(
os_filename,
os.R_OK,
):
os_filename = OS_RELEASE_FILENAME_FALLBACK
return os_filename
def parse_os_release(os_release_filename=None):
"""
Returns a C{dict} holding information about the system LSB release
by attempting to parse C{os_release_filename} if specified. If no
filename is provided
@raises: A FileNotFoundError if C{filename} does not exist.
"""
info = {}
if os_release_filename is None:
os_release_filename = get_os_filename()
with open(os_release_filename) as fd:
for line in fd:
key, value = line.split("=")
if key in OS_RELEASE_FILE_KEYS:
key = OS_RELEASE_FILE_KEYS[key.strip()]
value = value.strip().strip('"')
info[key] = value
return info
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