293 lines
8.1 KiB
Python
293 lines
8.1 KiB
Python
# -*- coding: utf-8 -*-
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#
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# 2013-2014 Nico Schottelius (nico-cdist at schottelius.org)
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#
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# This file is part of cdist.
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#
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# cdist is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# cdist is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with cdist. If not, see <http://www.gnu.org/licenses/>.
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#
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#
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import logging
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import glob
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import os
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import subprocess
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import stat
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import sys
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import shutil
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import tempfile
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import cdist.config
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import cdist.exec.local
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import cdist.exec.remote
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log = logging.getLogger(__name__)
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DEFAULT_MANIFEST = """
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for pkg in \
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file \
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linux-image-amd64 \
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lsb-release \
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openssh-server curl \
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syslinux grub2 \
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gdisk util-linux lvm2 mdadm \
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btrfs-tools e2fsprogs jfsutils reiser4progs xfsprogs; do
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__package $pkg --state present
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done
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# initramfs requires /init
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__link /init --source /sbin/init --type symbolic
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__file /etc/network/interfaces --source - --mode 0644 << eof
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# The loopback network interface
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auto lo
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iface lo inet loopback
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# The primary network interface
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auto eth0
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allow-hotplug eth0
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iface eth0 inet dhcp
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eof
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# Steven found this out - coyping it 1:1
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# fix the bloody 'stdin: is not a tty' problem
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__line /root/.profile --line 'mesg n' --state absent
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__hostname --name preos
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"""
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class PreOSExistsError(cdist.Error):
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def __init__(self, path):
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self.path = path
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def __str__(self):
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return 'Path %s already exists' % self.path
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class PreOSBootstrapError(cdist.Error):
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pass
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class PreOS(object):
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def __init__(self, target_dir, arch="amd64"):
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self.target_dir = target_dir
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self.arch = arch
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self.command = "debootstrap"
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self.suite = "stable"
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self.options = [ "--include=openssh-server",
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"--arch=%s" % self.arch ]
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self.pxelinux = "/usr/lib/syslinux/pxelinux.0"
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self.pxelinux_cfg = """
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DEFAULT preos
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LABEL preos
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KERNEL kernel
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INITRD initramfs
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"""
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def _init_helper(self):
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self.helper = {}
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self.helper["manifest"] = self.initial_manifest
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self.helper["remote_exec"] = """#!/bin/sh
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# echo $@
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# set -x
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chroot="$1"; shift
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script=$(mktemp "${chroot}/tmp/chroot-${0##*/}.XXXXXXXXXX")
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trap cleanup INT TERM EXIT
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cleanup() {
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[ $__cdist_debug ] || rm "$script"
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}
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echo "#!/bin/sh -l" > "$script"
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echo "$@" >> "$script"
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chmod +x "$script"
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relative_script="${script#$chroot}"
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# ensure PATH is setup
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export PATH=$PATH:/bin:/usr/bin:/sbin:/usr/sbin
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# run in chroot
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chroot "$chroot" "$relative_script"
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"""
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self.helper["remote_copy"] = """#!/bin/sh
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# echo $@
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# set -x
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src=$1; shift
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dst=$1; shift
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real_dst=$(echo $dst | sed 's,:,,')
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cp -L "$src" "$real_dst"
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"""
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@property
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def exists(self):
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return os.path.exists(self.target_dir)
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def bootstrap(self):
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if self.exists:
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raise PreOSExistsError(self.target_dir)
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cmd = [ self.command ]
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cmd.extend(self.options)
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cmd.append(self.suite)
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cmd.append(self.target_dir)
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log.debug("Bootstrap: %s" % cmd)
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try:
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subprocess.check_call(cmd)
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except subprocess.CalledProcessError:
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raise cdist.Error("Debootstrap failed (root priviliges required)")
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# Required to run this - otherwise apt-get install fails
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cmd = [ "chroot", self.target_dir, "/usr/bin/apt-get", "update" ]
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try:
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subprocess.check_call(cmd)
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except subprocess.CalledProcessError:
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raise cdist.Error("chrooted apt-get update failed (root priviliges required)")
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def create_helper_files(self, base_dir):
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for key, val in self.helper.items():
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filename = os.path.join(base_dir, key)
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with open(filename, "w") as fd:
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fd.write(val)
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os.chmod(filename, stat.S_IRUSR | stat.S_IXUSR)
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def create_kernel(self):
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dst = os.path.join(self.out_dir, "kernel")
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srcglob = glob.glob("%s/boot/vmlinuz-*" % self.target_dir)
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src = srcglob[0]
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log.info("Creating kernel ...")
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shutil.copyfile(src, dst, follow_symlinks=True)
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def create_pxelinux(self):
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dst = os.path.join(self.out_dir, "pxelinux.0")
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src = "%s/usr/lib/syslinux/pxelinux.0" % self.target_dir
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log.info("Creating pxelinux.0 ...")
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shutil.copyfile(src, dst, follow_symlinks=True)
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def create_pxeconfig(self):
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configdir = os.path.join(self.out_dir, "pxelinux.cfg")
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configfile = os.path.join(configdir, "default")
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log.info("Creating pxe configuration ...")
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if not os.path.isdir(configdir):
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os.mkdir(configdir)
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with open(configfile, "w") as fd:
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fd.write(self.pxelinux_cfg)
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def create_initramfs(self):
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out_file = os.path.join(self.out_dir, "initramfs")
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cmd="cd {target_dir}; find . -print0 | cpio --null -o --format=newc | gzip -9 > {out_file}".format(target_dir = self.target_dir, out_file = out_file)
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log.info("Creating initramfs ...")
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subprocess.check_call(cmd, shell=True)
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def ensure_out_dir_exists(self):
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os.makedirs(self.out_dir, exist_ok=True)
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def create_iso(self, out_dir):
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self.out_dir = out_dir
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self.ensure_out_dir_exists()
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raise cdist.Error("Generating ISO is not yet supported")
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def create_pxe(self, out_dir):
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self.out_dir = out_dir
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self.ensure_out_dir_exists()
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self.create_kernel()
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self.create_initramfs()
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self.create_pxeconfig()
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self.create_pxelinux()
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def setup_initial_manifest(self, user_initial_manifest, replace_manifest):
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if user_initial_manifest:
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if user_initial_manifest == '-':
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user_initial_manifest_content = sys.stdin.read()
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else:
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with open(user_initial_manifest, "r") as fd:
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user_initial_manifest_content = fd.read()
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else:
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user_initial_manifest_content = ""
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if replace_manifest:
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self.initial_manifest = user_initial_manifest_content
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else:
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self.initial_manifest = "{default}\n# User supplied manifest\n{user}".format(default=DEFAULT_MANIFEST, user=user_initial_manifest_content)
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def config(self):
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self._init_helper()
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handle, path = tempfile.mkstemp(prefix='cdist.stdin.')
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with tempfile.TemporaryDirectory() as tempdir:
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host = self.target_dir
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self.create_helper_files(tempdir)
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local = cdist.exec.local.Local(
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target_host=host,
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initial_manifest=os.path.join(tempdir, "manifest")
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)
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remote = cdist.exec.remote.Remote(
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target_host=host,
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remote_exec=os.path.join(tempdir, "remote_exec"),
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remote_copy=os.path.join(tempdir, "remote_copy"),
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)
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config = cdist.config.Config(local, remote)
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config.run()
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def cleanup(self):
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# Remove cruft from chroot
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for action in 'autoclean clean autoremove'.split():
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cmd = [ 'chroot', self.target_dir, '/usr/bin/apt-get', action]
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subprocess.check_call(cmd)
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@classmethod
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def commandline(cls, args):
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self = cls(target_dir=args.target_dir[0],
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arch=args.arch)
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# read initial manifest first - it may come from stdin
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if args.config:
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self.setup_initial_manifest(args.initial_manifest, args.replace_manifest)
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# Bootstrap: creates base directory
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if args.bootstrap:
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self.bootstrap()
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# Configure the OS
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if args.config:
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self.config()
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# Cleanup chroot
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self.cleanup()
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# Output pxe files
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if args.pxe_boot_dir:
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self.create_pxe(args.pxe_boot_dir)
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#if args.iso_boot_dir:
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# self.create_iso(args.iso_boot)
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