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Code Issues Projects Releases Wiki Activity

Image cloning changes

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Refactor and try to mask ssh
keys for root user.

Try to preserve selinux context for masked files.

Add progress indicator for writing to disk.
This commit is contained in:
Jarrod Johnson 2021-07-19 17:30:26 -04:00
parent db735a654d
commit 22008f9dc9
2 changed files with 97 additions and 15 deletions
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68
confluent_osdeploy/el8-diskless/profiles/default/scripts/image2disk.py
View File

@ -2,7 +2,10 @@
import json
import os
import re
import time
import socket
import struct
import sys
import subprocess
def get_next_part_meta(img, imgsize):
@ -78,6 +81,20 @@ def fixup(rootdir, vols):
entry[3] = entry[3].ljust(28)
tab = '\t'.join(entry)
tfile.write(tab + '\n')
with open(os.path.join(rootdir, 'etc/hostname'), 'w') as nameout:
nameout.write(socket.gethostname())
#NEED: grub config, ssh (maybe in script that calls image2disk), hostname.
#network interfaces, /etc/shadow of root's password, efibootmgr, various failed services
# grub error:
# error: ../../grub-core/commands/search.c:296:no such device:
#^M7c1840f3-64e3-4fca-ae3d-aa5ae9333e32.
#^Merror: ../../grub-core/commands/search.c:296:no such device:
#^M7c1840f3-64e3-4fca-ae3d-aa5ae9333e32.
#^Merror: ../../grub-core/commands/search.c:296:no such device: A278-1D2E.
#^Merror: ../../grub-core/commands/search.c:296:no such device: A278-1D2E.
def had_swap():
@ -224,7 +241,56 @@ def install_to_disk(imgpath):
subprocess.check_call(['mount', vol['targetdisk'], '/run/imginst/targ'])
source = vol['mount'].replace('/', '_')
source = '/run/imginst/sources/' + source
subprocess.check_call(['cp', '-ax', source + '/.', '/run/imginst/targ'])
blankfsstat = os.statvfs('/run/imginst/targ')
blankused = (blankfsstat.f_blocks - blankfsstat.f_bfree) * blankfsstat.f_bsize
sys.stdout.write('\nWriting {0}: '.format(vol['mount']))
with subprocess.Popen(['cp', '-ax', source + '/.', '/run/imginst/targ']) as copier:
stillrunning = copier.poll()
lastprogress = 0.0
while stillrunning is None:
currfsstat = os.statvfs('/run/imginst/targ')
currused = (currfsstat.f_blocks - currfsstat.f_bfree) * currfsstat.f_bsize
currused -= blankused
with open('/proc/meminfo') as meminf:
for line in meminf.read().split('\n'):
if line.startswith('Dirty:'):
_, dirty, _ = line.split()
dirty = int(dirty) * 1024
progress = (currused - dirty) / vol['minsize']
if progress < lastprogress:
progress = lastprogress
if progress > 0.99:
progress = 0.99
lastprogress = progress
progress = progress * 100
sys.stdout.write('\rWriting {0}: {1:3.2f}%'.format(vol['mount'], progress).ljust(70))
sys.stdout.flush()
time.sleep(0.5)
stillrunning = copier.poll()
if stillrunning != 0:
raise Exception("Error copying volume")
with subprocess.Popen(['sync']) as syncrun:
stillrunning = syncrun.poll()
while stillrunning is None:
with open('/proc/meminfo') as meminf:
for line in meminf.read().split('\n'):
if line.startswith('Dirty:'):
_, dirty, _ = line.split()
dirty = int(dirty) * 1024
progress = (vol['minsize'] - dirty) / vol['minsize']
if progress < lastprogress:
progress = lastprogress
if progress > 0.99:
progress = 0.99
lastprogress = progress
progress = progress * 100
sys.stdout.write('\rWriting {0}: {1:3.2f}%'.format(vol['mount'], progress).ljust(70))
sys.stdout.flush()
time.sleep(0.5)
stillrunning = syncrun.poll()
sys.stdout.write('\rDone writing {0}'.format(vol['mount']).ljust(70))
sys.stdout.write('\n')
sys.stdout.flush()
subprocess.check_call(['umount', '/run/imginst/targ'])
for vol in allvols:
subprocess.check_call(['mount', vol['targetdisk'], '/run/imginst/targ/' + vol['mount']])

44
imgutil/imgutil
View File

@ -66,31 +66,47 @@ def sanitize_shadow(shadowfile):
newshadow += ':'.join(passent) + '\n'
return newshadow
def mask_file(filename, maskwith='/run/imgutil/captmp/empty'):
if os.path.exists(filename):
_mount_file(maskwith, filename)
def mask_file(mdir, filename, maskwith='/run/imgutil/captmp/empty'):
if filename.startswith(mdir):
filename = filename.replace(mdir, '', 1)
if filename[0] == '/':
filename = filename[1:]
filename = os.path.join(mdir, filename)
if filename[0] == '/':
filename = filename[1:]
filename = os.path.join('/run/imgutil/capin/', filename)
if os.path.exists(filename):
secontext = os.getxattr(filename, 'security.selinux')
_mount_file(maskwith, filename)
if secontext:
secontext = secontext.split(b'\x00', 1)[0].decode('utf8')
subprocess.check_call(['chcon', secontext, maskwith])
def capture_fs(args):
fsinfo, fname = args
_mount(fsinfo['mount'], '/run/imgutil/capin', flags=MS_BIND|MS_RDONLY)
targdir = None
if fsinfo['mount'] == '/etc':
targdir = '/run/imgutil/capin'
elif fsinfo['mount'] == '/':
targdir = '/run/imgutil/capin/etc'
if targdir is not None:
mask_file(os.path.join(targdir, 'shadow'), '/run/imgutil/captmp/shadow')
mask_file(os.path.join(targdir, 'gshadow'), '/run/imgutil/captmp/gshadow')
mask_file(os.path.join(targdir, 'fstab'), '/run/imgutil/captmp/fstab')
mask_file(os.path.join(targdir, 'shadow-'))
mask_file(os.path.join(targdir, 'gshadow-'))
mask_file(os.path.join(targdir, 'hostname'))
mdir = fsinfo['mount']
mask_file(mdir, '/etc/shadow', '/run/imgutil/captmp/shadow')
mask_file(mdir, '/etc/gshadow', '/run/imgutil/captmp/gshadow')
mask_file(mdir, '/etc/fstab', '/run/imgutil/captmp/fstab')
mask_file(mdir, '/etc/confluent/confluent.apikey')
mask_file(mdir, '/etc/shadow-')
mask_file(mdir, '/etc/gshadow-')
mask_file(mdir, '/etc/hostname')
if '/etc'.startswith(mdir):
targdir = '/etc'.replace(mdir, '', 1)
targdir = os.path.join('/run/imgutil/capin', targdir)
for tname in glob.glob(os.path.join(targdir, 'ssh/*key')):
_mount_file('/run/imgutil/captmp/empty', tname)
for tname in glob.glob(os.path.join(targdir, 'pki/tls/private/*')):
_mount_file('/run/imgutil/captmp/empty', tname)
if os.path.exists(os.path.join(targdir, 'sysconfig/network-scripts')):
_mount('none', os.path.join(targdir, 'sysconfig/network-scripts'), 'tmpfs')
if '/root'.startswith(mdir):
targdir = '/root'.replace(mdir, '', 1)
for tname in glob.glob(os.path.join(targdir, '.ssh/id_*')):
_mount_file('/run/imgutil/captmp/empty, tname')
subprocess.check_call(['mksquashfs', '/run/imgutil/capin', fname + '.sfs', '-comp', 'xz'])
def capture_system():