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#!/usr/bin/python3
#
# Copyright (C) 2015 Red Hat
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see <https://www.gnu.org/licenses/>.
import os
import sys
def main(argv):
_, sysroot, bootloader = argv
if bootloader == "grub2":
sys.stdout.write('GRUB2 configuration validation not implemented.\n')
return 0
else:
return validate_syslinux(sysroot)
def fatal(msg):
sys.stderr.write(msg)
sys.stderr.write('\n')
sys.exit(1)
def get_ostree_option(optionstring):
for o in optionstring.split():
if o.startswith('ostree='):
return o[8:]
raise ValueError('ostree= not found in %r' % (optionstring,))
def parse_loader_configs(sysroot):
loaderpath = sysroot + '/boot/loader/entries'
entries = []
# Parse loader configs
for fname in os.listdir(loaderpath):
path = os.path.join(loaderpath, fname)
entry = {}
with open(path) as f:
for line in f:
line = line.strip()
if (line == '' or line.startswith('#')):
continue
k, v = line.split(' ', 1)
entry[k] = v
entries.append(entry)
entries.sort(key=lambda e: int(e['version']), reverse=True)
return entries
def validate_syslinux(sysroot):
syslinuxpath = sysroot + '/boot/syslinux/syslinux.cfg'
entries = parse_loader_configs(sysroot)
syslinux_entries = []
# Parse SYSLINUX config
with open(syslinuxpath) as f:
syslinux_entry = None
for line in f:
try:
k, v = line.strip().split(" ", 1)
except ValueError:
continue
if k == 'DEFAULT':
if syslinux_entry is not None:
syslinux_default = v
elif k == 'LABEL':
if syslinux_entry is not None:
syslinux_entries.append(syslinux_entry)
syslinux_entry = {}
syslinux_entry['title'] = v
elif k == 'KERNEL':
syslinux_entry['linux'] = v
elif k == 'INITRD':
syslinux_entry['initrd'] = v
elif k == 'APPEND':
syslinux_entry['options'] = v
if syslinux_entry is not None:
syslinux_entries.append(syslinux_entry)
if len(entries) != len(syslinux_entries):
fatal("Found {0} loader entries, but {1} SYSLINUX entries\n".format(
len(entries), len(syslinux_entries)))
def assert_key_same_file(a, b, key):
aval = a[key]
bval = b[key]
sys.stderr.write("aval: %r\nbval: %r\n" % (aval, bval))
# Paths in entries are always relative to /boot
entry = os.stat(sysroot + "/boot" + aval)
# Syslinux entries can be relative to /boot (if it's on another filesystem)
# or relative to / if /boot is on /.
s1 = os.stat(sysroot + bval)
s2 = os.stat(sysroot + "/boot" + bval)
# A symlink ensures that no matter what they point at the same file
assert_eq(entry, s1)
assert_eq(entry, s2)
for i, (entry, syslinuxentry) in enumerate(zip(entries, syslinux_entries)):
assert_key_same_file(entry, syslinuxentry, 'linux')
assert_key_same_file(entry, syslinuxentry, 'initrd')
entry_ostree = get_ostree_option(entry['options'])
syslinux_ostree = get_ostree_option(syslinuxentry['options'])
if entry_ostree != syslinux_ostree:
fatal("Mismatch on ostree option: {0} != {1}".format(
entry_ostree, syslinux_ostree))
sys.stdout.write('SYSLINUX configuration validated\n')
return 0
def assert_eq(a, b):
assert a == b, "%r == %r" % (a, b)
if __name__ == '__main__':
sys.exit(main(sys.argv))
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