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#!/usr/bin/python
# Copyright (C) 2014 Codethink Limited
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
'''A Baserock installer.'''
import morphlib
import os
import re
import sys
import json
import yaml
import subprocess
import tempfile
import errno
import time
import stat
import traceback
config_file = '/etc/install.conf'
to_mount = (
('/proc', 'proc', 'none'),
('/sys', 'sysfs', 'none'),
)
class NotDeviceError(Exception):
pass
class FileNotExistsError(Exception):
pass
class NotBaserockRootfsError(Exception):
pass
def validate_install_values(disk_dest, rootfs):
if not os.path.exists(disk_dest):
print "ERROR: The device %s doesn't exist." % disk_dest
raise FileNotExistsError
if not is_device(disk_dest):
print "ERROR: Not deploying to a device"
raise NotDeviceError
if not is_baserock_rootfs(rootfs):
print "ERROR: The rootfs %s is not a baserock rootfs." % rootfs
raise NotBaserockRootfsError
def is_baserock_rootfs(rootfs):
return os.path.isdir(os.path.join(rootfs, 'baserock'))
def run_install(writeext_path, deployment_config, rootfs, disk_dest):
env = dict(os.environ)
env.update(deployment_config)
subprocess.check_call([writeext_path, rootfs, disk_dest], env=env)
def finish_installation(postinstallcmd):
os.system("sync")
print "Executing `%s` in 5 seconds..." % postinstallcmd
time.sleep(5)
os.system(postinstallcmd)
def mount(partition, mount_point, fstype):
return subprocess.call(['mount', partition, mount_point, '-t', fstype])
def do_mounts(to_mount):
mounted = []
for mount_point, mount_type, source in to_mount:
print 'Mounting %s in %s' % (source, mount_point)
if not os.path.exists(mount_point):
os.makedirs(mount_point)
if mount(source, mount_point, mount_type) == 0:
mounted.append(mount_point)
return mounted
def do_unmounts(to_unmount):
for path in reversed(to_unmount):
print 'Unmounting %s' % path
if subprocess.call(['umount', path]) != 0:
print 'WARNING: Failed to `umount %s`' % path
def check_and_read_config(config_file):
print "Reading configuration from %s..." % config_file
keys = ('INSTALLER_TARGET_STORAGE_DEVICE',
'INSTALLER_ROOTFS_TO_INSTALL')
try:
with open(config_file) as f:
config = yaml.load(f)
except IOError as e:
if e.errno != errno.ENOENT:
raise
print "WARNING: Configuration file '%s' not found" % config_file
config = {}
device, rootfs = (read_option(config, key)
for key in keys)
postinstallcmd = read_option(config,
'INSTALLER_POST_INSTALL_COMMAND',
'reboot -f')
return device, rootfs, postinstallcmd
def read_option(config, option, default_value=None):
try:
value = config[option]
except KeyError as e:
if default_value:
value = default_value
else:
value = raw_input("Option '%s' missing, please enter a value: "
% option)
print "Option '%s' with value '%s'" % (option, value)
return value
def get_deployment_config(rootfs):
print "Reading deployment.meta of the system to install..."
try:
meta = open(os.path.join(rootfs, 'baserock/deployment.meta'))
except IOError as e:
if e.errno != errno.ENOENT:
raise
print "Failed to read deployment.meta, it will be empty"
deployment_config = {}
else:
deployment_config = json.load(meta).get('configuration', {})
meta.close()
print "################ Environment #################"
for key in deployment_config:
print "# %s: %s" % (key, deployment_config[key])
print "##############################################"
return deployment_config
def install_system(install_script):
subprocess.check_call(['sh', install_script])
def is_device(location):
try:
st = os.stat(location)
return stat.S_ISBLK(st.st_mode)
except OSError as e:
if e.errno == errno.ENOENT:
return False
raise
try:
print "Baserock installation script begins..."
mounted = do_mounts(to_mount)
writeext_path = morphlib.extensions._get_morph_extension_filename(
'rawdisk', '.write')
disk_dest, rootfs, postinstallcmd = check_and_read_config(
config_file)
validate_install_values(disk_dest, rootfs)
deployment_config=get_deployment_config(rootfs)
run_install(writeext_path, deployment_config, rootfs, disk_dest)
do_unmounts(mounted)
finish_installation(postinstallcmd)
except BaseException as e:
print traceback.format_exc()
print "Something failed, opening shell..."
print "Once you have finished, use `reboot -f`"
os.execl('/bin/sh', 'sh')
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