"""
grubby - command ``/usr/sbin/grubby``
=====================================
This is a collection of parsers that all deal with the command ``grubby``.
Parsers included in this module are:
GrubbyDefaultIndex - command ``grubby --default-index``
-------------------------------------------------------
GrubbyDefaultKernel - command ``grubby --default-kernel``
---------------------------------------------------------
"""
from insights.core import CommandParser
from insights.core.exceptions import ParseException, SkipComponent
from insights.core.plugins import parser
from insights.specs import Specs
[docs]
@parser(Specs.grubby_default_index)
class GrubbyDefaultIndex(CommandParser):
"""
This parser parses the output of command ``grubby --default-index``.
The typical output of this command is::
0
Examples:
>>> grubby_default_index.default_index
0
Raises:
SkipComponent: When output is empty
ParseException: When output is invalid
Attributes:
default_index (int): the numeric index of the current default boot entry, count from 0
"""
[docs]
def parse_content(self, content):
if not content:
raise SkipComponent('Empty output')
if len(content) != 1 or not content[0].isdigit():
raise ParseException('Invalid output: {0}', content)
self.default_index = int(content[0])
[docs]
@parser(Specs.grubby_default_kernel)
class GrubbyDefaultKernel(CommandParser):
"""
This parser parses the output of command ``grubby --default-kernel``.
The typical output of this command is::
/boot/vmlinuz-2.6.32-573.el6.x86_64
Examples:
>>> grubby_default_kernel.default_kernel
'/boot/vmlinuz-2.6.32-573.el6.x86_64'
Raises:
SkipComponent: When output is empty
ParseException: When output is invalid
Attributes:
default_kernel(str): The default kernel name for next boot
"""
[docs]
def parse_content(self, content):
if not content:
raise SkipComponent('Empty output')
# Skip the error lines to find the real default-kernel line.
# Typically, the default-kernel line is the last line in content.
default_kernel_str = None
if len(content) == 1:
default_kernel_str = content[0].strip()
else:
for idx in range(len(content) - 1, -1, -1):
line = content[idx]
if line.startswith('/boot/') and '/boot/vmlinuz-' in line:
if not default_kernel_str:
default_kernel_str = line.strip()
else:
raise ParseException('Invalid output: duplicate kernel lines: {0}', content)
if not default_kernel_str:
raise ParseException('Invalid output: no kernel line: {0}', content)
if len(default_kernel_str.split()) > 1:
raise ParseException('Invalid output: unparsable kernel line: {0}', content)
self.default_kernel = default_kernel_str