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Licensed under the Apache License, Version 2.0 (the "License"); | ||
you may not use this source code except in compliance with the License. | ||
You may obtain a copy of the License at | ||
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https://www.apache.org/licenses/LICENSE-2.0 | ||
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Unless required by applicable law or agreed to in writing, software | ||
distributed under the License is distributed on an "AS IS" BASIS, | ||
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
See the License for the specific language governing permissions and | ||
limitations under the License. |
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macadmin-scripts | ||
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Some scripts that might be of use to macOS admins. Might be related to Munki; | ||
might not. |
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#!/usr/bin/python | ||
# encoding: utf-8 | ||
# | ||
# Copyright 2017 Greg Neagle. | ||
# | ||
# Licensed under the Apache License, Version 2.0 (the "License"); | ||
# you may not use this file except in compliance with the License. | ||
# You may obtain a copy of the License at | ||
# | ||
# http://www.apache.org/licenses/LICENSE-2.0 | ||
# | ||
# Unless required by applicable law or agreed to in writing, software | ||
# distributed under the License is distributed on an "AS IS" BASIS, | ||
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
# See the License for the specific language governing permissions and | ||
# limitations under the License. | ||
'''A tool to make bootable disk volumes from the output of autonbi. Especially | ||
useful to make bootable disks containing Imagr and the 'SIP-ignoring' kernel, | ||
which allows Imagr to run scripts that affect SIP state, set UAKEL options, and | ||
run the `startosinstall` component, all of which might otherwise require network | ||
booting from a NetInstall-style nbi.''' | ||
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import argparse | ||
import os | ||
import plistlib | ||
import subprocess | ||
import sys | ||
import urlparse | ||
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# dmg helpers | ||
def mountdmg(dmgpath): | ||
""" | ||
Attempts to mount the dmg at dmgpath and returns first mountpoint | ||
""" | ||
mountpoints = [] | ||
dmgname = os.path.basename(dmgpath) | ||
cmd = ['/usr/bin/hdiutil', 'attach', dmgpath, | ||
'-mountRandom', '/tmp', '-nobrowse', '-plist', | ||
'-owners', 'on'] | ||
proc = subprocess.Popen(cmd, bufsize=-1, | ||
stdout=subprocess.PIPE, stderr=subprocess.PIPE) | ||
(pliststr, err) = proc.communicate() | ||
if proc.returncode: | ||
print >> sys.stderr, 'Error: "%s" while mounting %s.' % (err, dmgname) | ||
return None | ||
if pliststr: | ||
plist = plistlib.readPlistFromString(pliststr) | ||
for entity in plist['system-entities']: | ||
if 'mount-point' in entity: | ||
mountpoints.append(entity['mount-point']) | ||
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return mountpoints[0] | ||
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def unmountdmg(mountpoint): | ||
""" | ||
Unmounts the dmg at mountpoint | ||
""" | ||
proc = subprocess.Popen(['/usr/bin/hdiutil', 'detach', mountpoint], | ||
bufsize=-1, stdout=subprocess.PIPE, | ||
stderr=subprocess.PIPE) | ||
(dummy_output, err) = proc.communicate() | ||
if proc.returncode: | ||
print >> sys.stderr, 'Polite unmount failed: %s' % err | ||
print >> sys.stderr, 'Attempting to force unmount %s' % mountpoint | ||
# try forcing the unmount | ||
retcode = subprocess.call(['/usr/bin/hdiutil', 'detach', mountpoint, | ||
'-force']) | ||
if retcode: | ||
print >> sys.stderr, 'Failed to unmount %s' % mountpoint | ||
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def locate_basesystem_dmg(nbi): | ||
'''Finds and returns the relative path to the BaseSystem.dmg within the | ||
NetInstall.dmg''' | ||
source_boot_plist = os.path.join(nbi, 'i386/com.apple.Boot.plist') | ||
try: | ||
boot_args = plistlib.readPlist(source_boot_plist) | ||
except Exception, err: | ||
print >> sys.stderr, err | ||
sys.exit(-1) | ||
kernel_flags = boot_args.get('Kernel Flags') | ||
if not kernel_flags: | ||
print >> sys.stderr, 'i386/com.apple.Boot.plist is missing Kernel Flags' | ||
sys.exit(-1) | ||
# kernel flags should in the form 'root-dmg=file:///path' | ||
if not kernel_flags.startswith('root-dmg='): | ||
print >> sys.stderr, 'Unexpected Kernel Flags: %s' % kernel_flags | ||
sys.exit(-1) | ||
file_url = kernel_flags[9:] | ||
dmg_path = urlparse.unquote(urlparse.urlparse(file_url).path) | ||
# return path minus leading slash | ||
return dmg_path.lstrip('/') | ||
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def copy_system_version_plist(nbi, target_volume): | ||
'''Copies System/Library/CoreServices/SystemVersion.plist from the | ||
BaseSystem.dmg to the target volume.''' | ||
netinstall_dmg = os.path.join(nbi, 'NetInstall.dmg') | ||
if not os.path.exists(netinstall_dmg): | ||
print >> sys.stderr, "Missing NetInstall.dmg from nbi folder" | ||
sys.exit(-1) | ||
print 'Mounting %s...' % netinstall_dmg | ||
netinstall_mount = mountdmg(netinstall_dmg) | ||
if not netinstall_mount: | ||
sys.exit(-1) | ||
basesystem_dmg = os.path.join(netinstall_mount, locate_basesystem_dmg(nbi)) | ||
print 'Mounting %s...' % basesystem_dmg | ||
basesystem_mount = mountdmg(basesystem_dmg) | ||
if not basesystem_mount: | ||
unmountdmg(netinstall_mount) | ||
sys.exit(-1) | ||
source = os.path.join( | ||
basesystem_mount, 'System/Library/CoreServices/SystemVersion.plist') | ||
dest = os.path.join( | ||
target_volume, 'System/Library/CoreServices/SystemVersion.plist') | ||
try: | ||
subprocess.check_call( | ||
['/usr/bin/ditto', '-V', source, dest]) | ||
except subprocess.CalledProcessError, err: | ||
print >> sys.stderr, err | ||
unmountdmg(basesystem_mount) | ||
unmountdmg(netinstall_mount) | ||
sys.exit(-1) | ||
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unmountdmg(basesystem_mount) | ||
unmountdmg(netinstall_mount) | ||
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def copy_boot_files(nbi, target_volume): | ||
'''Copies some boot files, yo''' | ||
files_to_copy = [ | ||
['NetInstall.dmg', 'NetInstall.dmg'], | ||
['i386/PlatformSupport.plist', | ||
'System/Library/CoreServices/PlatformSupport.plist'], | ||
['i386/booter', 'System/Library/CoreServices/boot.efi'], | ||
['i386/booter', 'usr/standalone/i386/boot.efi'], | ||
['i386/x86_64/kernelcache', | ||
'System/Library/PrelinkedKernels/prelinkedkernel'] | ||
] | ||
for source, dest in files_to_copy: | ||
full_source = os.path.join(nbi, source) | ||
full_dest = os.path.join(target_volume, dest) | ||
try: | ||
subprocess.check_call( | ||
['/usr/bin/ditto', '-V', full_source, full_dest]) | ||
except subprocess.CalledProcessError, err: | ||
print >> sys.stderr, err | ||
sys.exit(-1) | ||
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def make_boot_plist(nbi, target_volume): | ||
'''Creates our com.apple.Boot.plist''' | ||
source_boot_plist = os.path.join(nbi, 'i386/com.apple.Boot.plist') | ||
try: | ||
boot_args = plistlib.readPlist(source_boot_plist) | ||
except Exception, err: | ||
print >> sys.stderr, err | ||
sys.exit(-1) | ||
kernel_flags = boot_args.get('Kernel Flags') | ||
if not kernel_flags: | ||
print >> sys.stderr, 'i386/com.apple.Boot.plist is missing Kernel Flags' | ||
sys.exit(-1) | ||
# prepend the container-dmg path | ||
boot_args['Kernel Flags'] = ( | ||
'container-dmg=file:///NetInstall.dmg ' + kernel_flags) | ||
boot_plist = os.path.join( | ||
target_volume, | ||
'Library/Preferences/SystemConfiguration/com.apple.Boot.plist') | ||
plist_dir = os.path.dirname(boot_plist) | ||
if not os.path.exists(plist_dir): | ||
os.makedirs(plist_dir) | ||
try: | ||
plistlib.writePlist(boot_args, boot_plist) | ||
except Exception, err: | ||
print >> sys.stderr, err | ||
sys.exit(-1) | ||
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def bless(target_volume, label=None): | ||
'''Bless the target volume''' | ||
blessfolder = os.path.join(target_volume, 'System/Library/CoreServices') | ||
if not label: | ||
label = os.path.basename(target_volume) | ||
try: | ||
subprocess.check_call( | ||
['/usr/sbin/bless', '--folder', blessfolder, '--label', label]) | ||
except subprocess.CalledProcessError, err: | ||
print >> sys.stderr, err | ||
sys.exit(-1) | ||
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def main(): | ||
'''Do the thing we were made for''' | ||
parser = argparse.ArgumentParser() | ||
parser.add_argument('--nbi', required=True, metavar='path_to_nbi', | ||
help='Path to nbi folder created by autonbi.') | ||
parser.add_argument('--volume', required=True, | ||
metavar='path_to_disk_volume', | ||
help='Path to disk volume.') | ||
args = parser.parse_args() | ||
copy_system_version_plist(args.nbi, args.volume) | ||
copy_boot_files(args.nbi, args.volume) | ||
make_boot_plist(args.nbi, args.volume) | ||
bless(args.volume) | ||
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if __name__ == '__main__': | ||
main() |
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