Disassembler
ce325cf3d0
- Bump basic OS to Alpine 3.9 - Restructure repo and add layer versioning - Use JSON for all metadata - Merge abuild branch (but without abuild)
211 lines
6.8 KiB
Python
Executable File
211 lines
6.8 KiB
Python
Executable File
#!/usr/bin/python3
|
|
|
|
import os
|
|
import shutil
|
|
import subprocess
|
|
import sys
|
|
|
|
LXC_ROOT = '/var/lib/lxc'
|
|
CONFIG_TEMPLATE = '''# Image name
|
|
lxc.uts.name = {name}
|
|
|
|
# Network
|
|
lxc.net.0.type = veth
|
|
lxc.net.0.link = lxcbr0
|
|
lxc.net.0.flags = up
|
|
|
|
# Volumes
|
|
lxc.rootfs.path = {rootfs}
|
|
|
|
# Mounts
|
|
lxc.mount.entry = shm dev/shm tmpfs rw,nodev,noexec,nosuid,relatime,mode=1777,create=dir 0 0
|
|
lxc.mount.entry = /etc/hosts etc/hosts none bind,create=file 0 0
|
|
lxc.mount.entry = /etc/resolv.conf etc/resolv.conf none bind,create=file 0 0
|
|
{mounts}
|
|
|
|
# Init
|
|
lxc.init.cmd = {cmd}
|
|
lxc.init.uid = {uid}
|
|
lxc.init.gid = {gid}
|
|
lxc.init.cwd = {cwd}
|
|
|
|
# Environment
|
|
lxc.environment = PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
|
|
{env}
|
|
|
|
# Halt
|
|
lxc.signal.halt = {halt}
|
|
|
|
# Log
|
|
lxc.console.size = 1MB
|
|
lxc.console.logfile = /var/log/lxc/{name}.log
|
|
|
|
# Other
|
|
lxc.arch = x86_64
|
|
lxc.cap.drop = sys_admin
|
|
lxc.hook.pre-start = /usr/bin/vmmgr prepare-container
|
|
lxc.hook.start-host = /usr/bin/vmmgr register-container
|
|
lxc.hook.post-stop = /usr/bin/vmmgr unregister-container
|
|
lxc.include = /usr/share/lxc/config/common.conf
|
|
'''
|
|
|
|
class LXCImage:
|
|
def __init__(self, build_path):
|
|
self.name = None
|
|
self.layers = []
|
|
self.mounts = []
|
|
self.env = []
|
|
self.uid = 0
|
|
self.gid = 0
|
|
self.cmd = '/bin/true'
|
|
self.cwd = '/'
|
|
self.halt = 'SIGINT'
|
|
|
|
if os.path.isfile(build_path):
|
|
self.lxcfile = os.path.realpath(build_path)
|
|
self.build_dir = os.path.dirname(self.lxcfile)
|
|
else:
|
|
self.build_dir = os.path.realpath(build_path)
|
|
self.lxcfile = os.path.join(self.build_dir, 'lxcfile')
|
|
|
|
def build(self):
|
|
with open(self.lxcfile, 'r') as f:
|
|
lxcfile = [l.strip() for l in f.readlines()]
|
|
|
|
script = []
|
|
script_eof = None
|
|
|
|
for line in lxcfile:
|
|
if script_eof:
|
|
if line == script_eof:
|
|
script_eof = None
|
|
self.run_script(script)
|
|
else:
|
|
script.append(line)
|
|
elif line.startswith('RUN'):
|
|
script = []
|
|
script_eof = line.split()[1]
|
|
elif line.startswith('IMAGE'):
|
|
self.set_name(line.split()[1])
|
|
elif line.startswith('LAYER'):
|
|
self.add_layer(line.split()[1])
|
|
elif line.startswith('FIXLAYER'):
|
|
self.fix_layer(line.split()[1])
|
|
elif line.startswith('COPY'):
|
|
srcdst = line.split()
|
|
self.copy_files(srcdst[1], srcdst[2] if len(srcdst) == 3 else '')
|
|
elif line.startswith('MOUNT'):
|
|
mount = line.split()
|
|
self.add_mount(mount[1], mount[2], mount[3])
|
|
elif line.startswith('ENV'):
|
|
env = line.split()
|
|
self.add_env(env[1], env[2])
|
|
elif line.startswith('USER'):
|
|
uidgid = line.split()
|
|
self.set_user(uidgid[1], uidgid[2])
|
|
elif line.startswith('CMD'):
|
|
self.set_cmd(' '.join(line.split()[1:]))
|
|
elif line.startswith('WORKDIR'):
|
|
self.set_cwd(line.split()[1])
|
|
elif line.startswith('HALT'):
|
|
self.set_halt(line.split()[1])
|
|
# Add the final layer which will be treated as ephemeral
|
|
self.add_layer('{}/delta0'.format(self.name))
|
|
|
|
def rebuild_config(self):
|
|
if not self.name:
|
|
return
|
|
if len(self.layers) == 1:
|
|
rootfs = self.layers[0]
|
|
else:
|
|
# Multiple lower overlayfs layers are ordered from right to left (lower2:lower1:rootfs:upper)
|
|
rootfs = 'overlay:{}:{}'.format(':'.join(self.layers[:-1][::-1]), self.layers[-1])
|
|
mounts = '\n'.join(self.mounts)
|
|
env = '\n'.join(self.env)
|
|
with open(os.path.join(LXC_ROOT, self.name, 'config'), 'w') as f:
|
|
f.write(CONFIG_TEMPLATE.format(name=self.name,
|
|
rootfs=rootfs, mounts=mounts, env=env,
|
|
uid=self.uid, gid=self.gid,
|
|
cmd=self.cmd, cwd=self.cwd, halt=self.halt))
|
|
|
|
def run_script(self, script):
|
|
sh = os.path.join(self.layers[-1], 'run.sh')
|
|
with open(sh, 'w') as f:
|
|
f.write('#!/bin/sh\nset -ev\n\n{}\n'.format('\n'.join(script)))
|
|
os.chmod(sh, 0o700)
|
|
subprocess.run(['lxc-execute', '-n', self.name, '--', '/bin/sh', '-lc', '/run.sh'], check=True)
|
|
os.unlink(sh)
|
|
|
|
def set_name(self, name):
|
|
self.name = name
|
|
os.makedirs(os.path.join(LXC_ROOT, self.name), 0o755, True)
|
|
|
|
def add_layer(self, layer):
|
|
layer = os.path.join(LXC_ROOT, layer)
|
|
self.layers.append(layer)
|
|
os.makedirs(layer, 0o755, True)
|
|
self.rebuild_config()
|
|
|
|
def fix_layer(self, cmd):
|
|
subprocess.run([cmd]+self.layers, check=True)
|
|
|
|
def copy_files(self, src, dst):
|
|
dst = os.path.join(self.layers[-1], dst)
|
|
if src.startswith('http://') or src.startswith('https://'):
|
|
self.unpack_http_archive(src, dst)
|
|
else:
|
|
src = os.path.join(self.build_dir, src)
|
|
copy_tree(src, dst)
|
|
|
|
def unpack_http_archive(self, src, dst):
|
|
xf = 'xzf'
|
|
if src.endswith('.bz2'):
|
|
xf = 'xjf'
|
|
elif src.endswith('.xz'):
|
|
xf = 'xJf'
|
|
with subprocess.Popen(['wget', src, '-O', '-'], stdout=subprocess.PIPE) as wget:
|
|
with subprocess.Popen(['tar', xf, '-', '-C', dst], stdin=wget.stdout) as tar:
|
|
wget.stdout.close()
|
|
tar.wait()
|
|
|
|
def add_mount(self, type, src, dst):
|
|
self.mounts.append('lxc.mount.entry = {} {} none bind,create={} 0 0'.format(src, dst, type.lower()))
|
|
self.rebuild_config()
|
|
|
|
def add_env(self, key, value):
|
|
self.env.append('lxc.environment = {}={}'.format(key, value))
|
|
self.rebuild_config()
|
|
|
|
def set_user(self, uid, gid):
|
|
self.uid = uid
|
|
self.gid = gid
|
|
self.rebuild_config()
|
|
|
|
def set_cmd(self, cmd):
|
|
self.cmd = cmd
|
|
self.rebuild_config()
|
|
|
|
def set_cwd(self, cwd):
|
|
self.cwd = cwd
|
|
self.rebuild_config()
|
|
|
|
def set_halt(self, halt):
|
|
self.halt = halt
|
|
self.rebuild_config()
|
|
|
|
def copy_tree(src, dst):
|
|
if not os.path.isdir(src):
|
|
shutil.copy2(src, dst)
|
|
else:
|
|
os.makedirs(dst, exist_ok=True)
|
|
for name in os.listdir(src):
|
|
copy_tree(os.path.join(src, name), os.path.join(dst, name))
|
|
shutil.copystat(src, dst)
|
|
|
|
if __name__ == '__main__':
|
|
if len(sys.argv) != 2 or sys.argv[1] in ('-h', '--help'):
|
|
print('Usage: lxc-build <buildpath>\n where the buildpath can be either specific lxcfile or a directory containing one')
|
|
else:
|
|
i = LXCImage(sys.argv[1])
|
|
i.build()
|