def GetLatestBootstrapUrl():
    base_url = 'http://mirrors.kernel.org/archlinux/iso/latest/'
    sha1sums = utils.HttpGet(base_url + 'sha1sums.txt')
    items = sha1sums.splitlines()
    for item in items:
        if TARGET_ARCH in item and 'bootstrap' in item:
            entries = item.split()
            return base_url + entries[1], entries[0]
    raise RuntimeError('Cannot find Arch bootstrap url')
Beispiel #2
0
def DistroSpecific(g: guestfs.GuestFS):
    el_release = utils.GetMetadataAttribute('el_release')
    install_gce = utils.GetMetadataAttribute('install_gce_packages')
    rhel_license = utils.GetMetadataAttribute('use_rhel_gce_license')

    # This must be performed prior to making network calls from the guest.
    # Otherwise, if /etc/resolv.conf is present, and has an immutable attribute,
    # guestfs will fail with:
    #
    #   rename: /sysroot/etc/resolv.conf to
    #     /sysroot/etc/i9r7obu6: Operation not permitted
    utils.common.ClearEtcResolv(g)

    # Some imported images haven't contained `/etc/yum.repos.d`.
    if not g.exists('/etc/yum.repos.d'):
        g.mkdir('/etc/yum.repos.d')

    if rhel_license == 'true':
        if 'Red Hat' in g.cat('/etc/redhat-release'):
            g.command(['yum', 'remove', '-y', '*rhui*'])
            logging.info('Adding in GCE RHUI package.')
            g.write('/etc/yum.repos.d/google-cloud.repo',
                    repo_compute % el_release)
            yum_install(g, 'google-rhui-client-rhel' + el_release)

    if install_gce == 'true':
        logging.info('Installing GCE packages.')
        g.write('/etc/yum.repos.d/google-cloud.repo',
                repo_compute % el_release)
        if el_release == '6':
            if 'CentOS' in g.cat('/etc/redhat-release'):
                logging.info('Installing CentOS SCL.')
                g.command(['rm', '-f', '/etc/yum.repos.d/CentOS-SCL.repo'])
                yum_install(g, 'centos-release-scl')
            # Install Google Cloud SDK from the upstream tar and create links for the
            # python27 SCL environment.
            logging.info('Installing python27 from SCL.')
            yum_install(g, 'python27')
            logging.info('Installing Google Cloud SDK from tar.')
            sdk_base_url = 'https://dl.google.com/dl/cloudsdk/channels/rapid'
            sdk_base_tar = '%s/google-cloud-sdk.tar.gz' % sdk_base_url
            tar = utils.HttpGet(sdk_base_tar)
            g.write('/tmp/google-cloud-sdk.tar.gz', tar)
            g.command(
                ['tar', 'xzf', '/tmp/google-cloud-sdk.tar.gz', '-C', '/tmp'])
            sdk_version = g.cat('/tmp/google-cloud-sdk/VERSION').strip()

            logging.info('Getting Cloud SDK Version %s', sdk_version)
            sdk_version_tar = 'google-cloud-sdk-%s-linux-x86_64.tar.gz' % sdk_version
            sdk_version_tar_url = '%s/downloads/%s' % (sdk_base_url,
                                                       sdk_version_tar)
            logging.info('Getting versioned Cloud SDK tar file from %s',
                         sdk_version_tar_url)
            tar = utils.HttpGet(sdk_version_tar_url)
            sdk_version_tar_file = os.path.join('/tmp', sdk_version_tar)
            g.write(sdk_version_tar_file, tar)
            g.mkdir_p('/usr/local/share/google')
            g.command([
                'tar', 'xzf', sdk_version_tar_file, '-C',
                '/usr/local/share/google', '--no-same-owner'
            ])

            logging.info('Creating CloudSDK SCL symlinks.')
            sdk_bin_path = '/usr/local/share/google/google-cloud-sdk/bin'
            g.ln_s(os.path.join(sdk_bin_path, 'git-credential-gcloud.sh'),
                   os.path.join('/usr/bin', 'git-credential-gcloud.sh'))
            for binary in ['bq', 'gcloud', 'gsutil']:
                binary_path = os.path.join(sdk_bin_path, binary)
                new_bin_path = os.path.join('/usr/bin', binary)
                bin_str = '#!/bin/bash\nsource /opt/rh/python27/enable\n%s $@' % \
                    binary_path
                g.write(new_bin_path, bin_str)
                g.chmod(0o755, new_bin_path)
        else:
            g.write_append('/etc/yum.repos.d/google-cloud.repo',
                           repo_sdk % el_release)
            yum_install(g, 'google-cloud-sdk')
        yum_install(g, 'google-compute-engine', 'google-osconfig-agent')

    logging.info('Updating initramfs')
    for kver in g.ls('/lib/modules'):
        # Although each directory in /lib/modules typically corresponds to a
        # kernel version  [1], that may not always be true.
        # kernel-abi-whitelists, for example, creates extra directories in
        # /lib/modules.
        #
        # Skip building initramfs if the directory doesn't look like a
        # kernel version. Emulates the version matching from depmod [2].
        #
        # 1. https://tldp.org/LDP/Linux-Filesystem-Hierarchy/html/lib.html
        # 2. https://kernel.googlesource.com/pub/scm/linux/kernel/git/mmarek/kmod
        # /+/tip/tools/depmod.c#2537
        if not re.match(r'^\d+.\d+', kver):
            logging.debug(
                '/lib/modules/{} doesn\'t look like a kernel directory. '
                'Skipping creation of initramfs for it'.format(kver))
            continue
        if not g.exists(os.path.join('/lib/modules', kver, 'modules.dep')):
            try:
                g.command(['depmod', kver])
            except RuntimeError as e:
                logging.info(
                    'Failed to write initramfs for {kver}. If image fails to '
                    'boot, verify that depmod /lib/modules/{kver} runs on '
                    'the original machine'.format(kver=kver))
                logging.debug('depmod error: {}'.format(e))
                continue
        if el_release == '6':
            # Version 6 doesn't have option --kver
            g.command(['dracut', '-v', '-f', kver])
        else:
            g.command(['dracut', '--stdlog=1', '-f', '--kver', kver])

    logging.info('Update grub configuration')
    if el_release == '6':
        # Version 6 doesn't have grub2, file grub.conf needs to be updated by hand
        g.write('/tmp/grub_gce_generated', grub_cfg)
        g.sh(r'grep -P "^[\t ]*initrd|^[\t ]*root|^[\t ]*kernel|^[\t ]*title" '
             r'/boot/grub/grub.conf >> /tmp/grub_gce_generated;'
             r'sed -i "s/console=ttyS0[^ ]*//g" /tmp/grub_gce_generated;'
             r'sed -i "/^[\t ]*kernel/s/$/ console=ttyS0,38400n8/" '
             r'/tmp/grub_gce_generated;'
             r'mv /tmp/grub_gce_generated /boot/grub/grub.conf')
    else:
        g.write('/etc/default/grub', grub2_cfg)
        g.command(['grub2-mkconfig', '-o', '/boot/grub2/grub.cfg'])

    # Reset network for DHCP.
    logging.info('Resetting network to DHCP for eth0.')
    # Remove NetworkManager-config-server if it's present. The package configures
    # NetworkManager to *not* use DHCP.
    #  https://access.redhat.com/solutions/894763
    g.command(['yum', 'remove', '-y', 'NetworkManager-config-server'])
    g.write('/etc/sysconfig/network-scripts/ifcfg-eth0', ifcfg_eth0)
Beispiel #3
0
def DistroSpecific(g):
    el_release = utils.GetMetadataParam('el_release')
    install_gce = utils.GetMetadataParam('install_gce_packages')
    rhel_license = utils.GetMetadataParam('use_rhel_gce_license')

    if rhel_license == 'true':
        if 'Red Hat' in g.cat('/etc/redhat-release'):
            g.command(['yum', 'remove', '-y', '*rhui*'])
            logging.info('Adding in GCE RHUI package.')
            g.write('/etc/yum.repos.d/google-cloud.repo',
                    repo_compute % el_release)
            g.command([
                'yum', 'install', '-y',
                'google-rhui-client-rhel%s' % el_release
            ])

    if install_gce == 'true':
        logging.info('Installing GCE packages.')
        g.write('/etc/yum.repos.d/google-cloud.repo',
                repo_compute % el_release)
        if el_release == '7':
            g.write_append('/etc/yum.repos.d/google-cloud.repo',
                           repo_sdk % el_release)
            g.command(['yum', '-y', 'install', 'google-cloud-sdk'])
        if el_release == '6':
            if 'CentOS' in g.cat('/etc/redhat-release'):
                logging.info('Installing CentOS SCL.')
                g.command(['rm', '-f', '/etc/yum.repos.d/CentOS-SCL.repo'])
                g.command(['yum', '-y', 'install', 'centos-release-scl'])
            # Install Google Cloud SDK from the upstream tar and create links for the
            # python27 SCL environment.
            logging.info('Installing python27 from SCL.')
            g.command(['yum', '-y', 'install', 'python27'])
            g.command([
                'scl', 'enable', 'python27',
                'pip2.7 install --upgrade google_compute_engine'
            ])

            logging.info('Installing Google Cloud SDK from tar.')
            sdk_base_url = 'https://dl.google.com/dl/cloudsdk/channels/rapid'
            sdk_base_tar = '%s/google-cloud-sdk.tar.gz' % sdk_base_url
            tar = utils.HttpGet(sdk_base_tar)
            g.write('/tmp/google-cloud-sdk.tar.gz', tar)
            g.command(
                ['tar', 'xzf', '/tmp/google-cloud-sdk.tar.gz', '-C', '/tmp'])
            sdk_version = g.cat('/tmp/google-cloud-sdk/VERSION').strip()

            logging.info('Getting Cloud SDK Version %s', sdk_version)
            sdk_version_tar = 'google-cloud-sdk-%s-linux-x86_64.tar.gz' % sdk_version
            sdk_version_tar_url = '%s/downloads/%s' % (sdk_base_url,
                                                       sdk_version_tar)
            logging.info('Getting versioned Cloud SDK tar file from %s',
                         sdk_version_tar_url)
            tar = utils.HttpGet(sdk_version_tar_url)
            sdk_version_tar_file = os.path.join('/tmp', sdk_version_tar)
            g.write(sdk_version_tar_file, tar)
            g.mkdir_p('/usr/local/share/google')
            g.command([
                'tar', 'xzf', sdk_version_tar_file, '-C',
                '/usr/local/share/google', '--no-same-owner'
            ])

            logging.info('Creating CloudSDK SCL symlinks.')
            sdk_bin_path = '/usr/local/share/google/google-cloud-sdk/bin'
            g.ln_s(os.path.join(sdk_bin_path, 'git-credential-gcloud.sh'),
                   os.path.join('/usr/bin', 'git-credential-gcloud.sh'))
            for binary in ['bq', 'gcloud', 'gsutil']:
                binary_path = os.path.join(sdk_bin_path, binary)
                new_bin_path = os.path.join('/usr/bin', binary)
                bin_str = '#!/bin/bash\nsource /opt/rh/python27/enable\n%s $@' % binary_path
                g.write(new_bin_path, bin_str)
                g.chmod(0755, new_bin_path)

        g.command([
            'yum', '-y', 'install', 'google-compute-engine',
            'python-google-compute-engine'
        ])

    logging.info('Updating initramfs')
    for kver in g.ls('/lib/modules'):
        if el_release == '6':
            # Version 6 doesn't have option --kver
            g.command(['dracut', '-v', '-f', kver])
        else:
            g.command(['dracut', '-v', '-f', '--kver', kver])

    logging.info('Update grub configuration')
    if el_release == '6':
        # Version 6 doesn't have grub2, file grub.conf needs to be updated by hand
        g.write('/tmp/grub_gce_generated', grub_cfg)
        g.sh(r'grep -P "^[\t ]*initrd|^[\t ]*root|^[\t ]*kernel|^[\t ]*title" '
             r'/boot/grub/grub.conf >> /tmp/grub_gce_generated;'
             r'sed -i "s/console=ttyS0[^ ]*//g" /tmp/grub_gce_generated;'
             r'sed -i "/^[\t ]*kernel/s/$/ console=ttyS0,38400n8/" '
             r'/tmp/grub_gce_generated;'
             r'mv /tmp/grub_gce_generated /boot/grub/grub.conf')
    else:
        g.write('/etc/default/grub', grub2_cfg)
        g.command(['grub2-mkconfig', '-o', '/boot/grub2/grub.cfg'])

    # Reset network for DHCP.
    logging.info('Resetting network to DHCP for eth0.')
    g.write('/etc/sysconfig/network-scripts/ifcfg-eth0', ifcfg_eth0)
def DistroSpecific(g):
    el_release = utils.GetMetadataAttribute('el_release')
    install_gce = utils.GetMetadataAttribute('install_gce_packages')
    rhel_license = utils.GetMetadataAttribute('use_rhel_gce_license')

    # This must be performed prior to making network calls from the guest.
    # Otherwise, if /etc/resolv.conf is present, and has an immutable attribute,
    # guestfs will fail with:
    #
    #   rename: /sysroot/etc/resolv.conf to
    #     /sysroot/etc/i9r7obu6: Operation not permitted
    utils.common.ClearEtcResolv(g)

    if rhel_license == 'true':
        if 'Red Hat' in g.cat('/etc/redhat-release'):
            g.command(['yum', 'remove', '-y', '*rhui*'])
            logging.info('Adding in GCE RHUI package.')
            g.write('/etc/yum.repos.d/google-cloud.repo',
                    repo_compute % el_release)
            yum_install(g, 'google-rhui-client-rhel' + el_release)

    if install_gce == 'true':
        logging.info('Installing GCE packages.')
        g.write('/etc/yum.repos.d/google-cloud.repo',
                repo_compute % el_release)
        if el_release == '6':
            if 'CentOS' in g.cat('/etc/redhat-release'):
                logging.info('Installing CentOS SCL.')
                g.command(['rm', '-f', '/etc/yum.repos.d/CentOS-SCL.repo'])
                yum_install(g, 'centos-release-scl')
            # Install Google Cloud SDK from the upstream tar and create links for the
            # python27 SCL environment.
            logging.info('Installing python27 from SCL.')
            yum_install(g, 'python27')
            g.command(
                ['scl', 'enable', 'python27', 'pip2.7 install --upgrade pip'])
            g.command([
                'scl', 'enable', 'python27',
                'pip2.7 install --upgrade google_compute_engine'
            ])

            logging.info('Installing Google Cloud SDK from tar.')
            sdk_base_url = 'https://dl.google.com/dl/cloudsdk/channels/rapid'
            sdk_base_tar = '%s/google-cloud-sdk.tar.gz' % sdk_base_url
            tar = utils.HttpGet(sdk_base_tar)
            g.write('/tmp/google-cloud-sdk.tar.gz', tar)
            g.command(
                ['tar', 'xzf', '/tmp/google-cloud-sdk.tar.gz', '-C', '/tmp'])
            sdk_version = g.cat('/tmp/google-cloud-sdk/VERSION').strip()

            logging.info('Getting Cloud SDK Version %s', sdk_version)
            sdk_version_tar = 'google-cloud-sdk-%s-linux-x86_64.tar.gz' % sdk_version
            sdk_version_tar_url = '%s/downloads/%s' % (sdk_base_url,
                                                       sdk_version_tar)
            logging.info('Getting versioned Cloud SDK tar file from %s',
                         sdk_version_tar_url)
            tar = utils.HttpGet(sdk_version_tar_url)
            sdk_version_tar_file = os.path.join('/tmp', sdk_version_tar)
            g.write(sdk_version_tar_file, tar)
            g.mkdir_p('/usr/local/share/google')
            g.command([
                'tar', 'xzf', sdk_version_tar_file, '-C',
                '/usr/local/share/google', '--no-same-owner'
            ])

            logging.info('Creating CloudSDK SCL symlinks.')
            sdk_bin_path = '/usr/local/share/google/google-cloud-sdk/bin'
            g.ln_s(os.path.join(sdk_bin_path, 'git-credential-gcloud.sh'),
                   os.path.join('/usr/bin', 'git-credential-gcloud.sh'))
            for binary in ['bq', 'gcloud', 'gsutil']:
                binary_path = os.path.join(sdk_bin_path, binary)
                new_bin_path = os.path.join('/usr/bin', binary)
                bin_str = '#!/bin/bash\nsource /opt/rh/python27/enable\n%s $@' % \
                    binary_path
                g.write(new_bin_path, bin_str)
                g.chmod(0o755, new_bin_path)
        else:
            g.write_append('/etc/yum.repos.d/google-cloud.repo',
                           repo_sdk % el_release)
            yum_install(g, 'google-cloud-sdk')

        if el_release == '8':
            yum_install(g, 'google-compute-engine',
                        'python3-google-compute-engine')
        else:
            yum_install(g, 'google-compute-engine',
                        'python-google-compute-engine')

    logging.info('Updating initramfs')
    for kver in g.ls('/lib/modules'):
        if not g.exists(os.path.join('/lib/modules', kver, 'modules.dep')):
            g.command(['depmod', kver])
        if el_release == '6':
            # Version 6 doesn't have option --kver
            g.command(['dracut', '-v', '-f', kver])
        else:
            g.command(['dracut', '--stdlog=1', '-f', '--kver', kver])

    logging.info('Update grub configuration')
    if el_release == '6':
        # Version 6 doesn't have grub2, file grub.conf needs to be updated by hand
        g.write('/tmp/grub_gce_generated', grub_cfg)
        g.sh(r'grep -P "^[\t ]*initrd|^[\t ]*root|^[\t ]*kernel|^[\t ]*title" '
             r'/boot/grub/grub.conf >> /tmp/grub_gce_generated;'
             r'sed -i "s/console=ttyS0[^ ]*//g" /tmp/grub_gce_generated;'
             r'sed -i "/^[\t ]*kernel/s/$/ console=ttyS0,38400n8/" '
             r'/tmp/grub_gce_generated;'
             r'mv /tmp/grub_gce_generated /boot/grub/grub.conf')
    else:
        g.write('/etc/default/grub', grub2_cfg)
        g.command(['grub2-mkconfig', '-o', '/boot/grub2/grub.cfg'])

    # Reset network for DHCP.
    logging.info('Resetting network to DHCP for eth0.')
    # Remove NetworkManager-config-server if it's present. The package configures
    # NetworkManager to *not* use DHCP.
    #  https://access.redhat.com/solutions/894763
    g.command(['yum', 'remove', '-y', 'NetworkManager-config-server'])
    g.write('/etc/sysconfig/network-scripts/ifcfg-eth0', ifcfg_eth0)
def DistroSpecific(spec: TranslateSpec):
    g = spec.g
    el_release = spec.el_release
    # This must be performed prior to making network calls from the guest.
    # Otherwise, if /etc/resolv.conf is present, and has an immutable attribute,
    # guestfs will fail with:
    #
    #   rename: /sysroot/etc/resolv.conf to
    #     /sysroot/etc/i9r7obu6: Operation not permitted
    utils.common.ClearEtcResolv(g)

    # Some imported images haven't contained `/etc/yum.repos.d`.
    if not g.exists('/etc/yum.repos.d'):
        g.mkdir('/etc/yum.repos.d')

    if spec.distro == Distro.RHEL:
        if spec.use_rhel_gce_license:
            run(g, ['yum', 'remove', '-y', '*rhui*'])
            logging.info('Adding in GCE RHUI package.')
            g.write('/etc/yum.repos.d/google-cloud.repo',
                    repo_compute % el_release)
            yum_install(g, 'google-rhui-client-rhel' + el_release)

    # Historically, translations have failed for corrupt dbcache and rpmdb.
    if yum_is_on_path(spec):
        run(g, 'yum clean -y all')

    if spec.install_gce:
        logging.info('Installing GCE packages.')
        g.write('/etc/yum.repos.d/google-cloud.repo',
                repo_compute % el_release)
        if el_release == '6':
            # yum operations fail when the epel repo is used with stale
            # ca-certificates, causing translation to fail. To avoid that,
            # update ca-certificates when the epel repo is found.
            #
            # The `--disablerepo` flag does the following:
            #  1. Skip the epel repo for *this* operation only.
            #  2. Block update if the epel repo isn't found.
            p = run(g,
                    'yum update -y ca-certificates --disablerepo=epel',
                    raiseOnError=False)
            logging.debug('Attempted conditional update of '
                          'ca-certificates. Success expected only '
                          'if epel repo is installed. Result={}'.format(p))

            # Install Google Cloud SDK from the upstream tar and create links for the
            # python27 SCL environment.
            logging.info('Installing python27 from SCL.')
            yum_install(g, 'python27')
            logging.info('Installing Google Cloud SDK from tar.')
            sdk_base_url = 'https://dl.google.com/dl/cloudsdk/channels/rapid'
            sdk_base_tar = '%s/google-cloud-sdk.tar.gz' % sdk_base_url
            tar = utils.HttpGet(sdk_base_tar)
            g.write('/tmp/google-cloud-sdk.tar.gz', tar)
            run(g,
                ['tar', 'xzf', '/tmp/google-cloud-sdk.tar.gz', '-C', '/tmp'])
            sdk_version = g.cat('/tmp/google-cloud-sdk/VERSION').strip()

            logging.info('Getting Cloud SDK Version %s', sdk_version)
            sdk_version_tar = 'google-cloud-sdk-%s-linux-x86_64.tar.gz' % sdk_version
            sdk_version_tar_url = '%s/downloads/%s' % (sdk_base_url,
                                                       sdk_version_tar)
            logging.info('Getting versioned Cloud SDK tar file from %s',
                         sdk_version_tar_url)
            tar = utils.HttpGet(sdk_version_tar_url)
            sdk_version_tar_file = os.path.join('/tmp', sdk_version_tar)
            g.write(sdk_version_tar_file, tar)
            g.mkdir_p('/usr/local/share/google')
            run(g, [
                'tar', 'xzf', sdk_version_tar_file, '-C',
                '/usr/local/share/google', '--no-same-owner'
            ])

            logging.info('Creating CloudSDK SCL symlinks.')
            sdk_bin_path = '/usr/local/share/google/google-cloud-sdk/bin'
            g.ln_s(os.path.join(sdk_bin_path, 'git-credential-gcloud.sh'),
                   os.path.join('/usr/bin', 'git-credential-gcloud.sh'))
            for binary in ['bq', 'gcloud', 'gsutil']:
                binary_path = os.path.join(sdk_bin_path, binary)
                new_bin_path = os.path.join('/usr/bin', binary)
                bin_str = '#!/bin/bash\nsource /opt/rh/python27/enable\n%s $@' % \
                    binary_path
                g.write(new_bin_path, bin_str)
                g.chmod(0o755, new_bin_path)
                logging.info('Enabling rsyslog')
                run(g, 'chkconfig rsyslog on')
        else:
            g.write_append('/etc/yum.repos.d/google-cloud.repo',
                           repo_sdk % el_release)
            yum_install(g, 'google-cloud-sdk')
        yum_install(g, 'google-compute-engine', 'google-osconfig-agent')

    logging.info('Updating initramfs')
    for kver in g.ls('/lib/modules'):
        logging.debug('Updating initramfs for ' + kver)
        # Although each directory in /lib/modules typically corresponds to a
        # kernel version  [1], that may not always be true.
        # kernel-abi-whitelists, for example, creates extra directories in
        # /lib/modules.
        #
        # Skip building initramfs if the directory doesn't look like a
        # kernel version. Emulates the version matching from depmod [2].
        #
        # 1. https://tldp.org/LDP/Linux-Filesystem-Hierarchy/html/lib.html
        # 2. https://kernel.googlesource.com/pub/scm/linux/kernel/git/mmarek/kmod
        # /+/tip/tools/depmod.c#2537
        if not re.match(r'^\d+.\d+', kver):
            logging.debug(
                '/lib/modules/{} doesn\'t look like a kernel directory. '
                'Skipping creation of initramfs for it'.format(kver))
            continue

        # We perform a best-effort attempt to rebuild initramfs; if there's a
        # failure, continue while giving the user some debug tips. This is
        # sensible since the existing initramfs may work for booting. Or the
        # failure may be associated with an older kernel that will never be used.
        cmds = []
        if not g.exists(os.path.join('/lib/modules', kver, 'modules.dep')):
            cmds.append(['depmod', kver])
        if el_release == '6':
            # Version 6 doesn't have option --kver
            cmds.append(['dracut', '-v', '-f', kver])
        else:
            cmds.append(['dracut', '--stdlog=1', '-f', '--kver', kver])
        for cmd in cmds:
            try:
                run(g, cmd)
            except RuntimeError as e:
                cmd_string = ' '.join(cmd)
                logging.debug('`{cmd}` error: {err}'.format(cmd=cmd_string,
                                                            err=e))
                msg = (
                    'Failed to write initramfs for {kver}. If the image '
                    'fails to boot: Boot the original machine, remove unused '
                    'kernel versions, verify that `{cmd}` runs, re-export '
                    'the disks, and re-import.').format(kver=kver,
                                                        cmd=cmd_string)
                logging.info(msg)
                break

    logging.info('Update grub configuration')
    if el_release == '6':
        # Version 6 doesn't have grub2, file grub.conf needs to be updated by hand
        g.write('/tmp/grub_gce_generated', grub_cfg)
        run(
            g,
            r'grep -P "^[\t ]*initrd|^[\t ]*root|^[\t ]*kernel|^[\t ]*title" '
            r'/boot/grub/grub.conf >> /tmp/grub_gce_generated;'
            r'sed -i "s/console=ttyS0[^ ]*//g" /tmp/grub_gce_generated;'
            r'sed -i "/^[\t ]*kernel/s/$/ console=ttyS0,38400n8/" '
            r'/tmp/grub_gce_generated;'
            r'mv /tmp/grub_gce_generated /boot/grub/grub.conf')
    else:
        g.write('/etc/default/grub', grub2_cfg)
        run(g, ['grub2-mkconfig', '-o', '/boot/grub2/grub.cfg'])

    reset_network_for_dhcp(spec)