109 lines
4.3 KiB
Ruby
109 lines
4.3 KiB
Ruby
module LXC
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class << self
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def start_ephemeral(original_container_name, target_container_name, opts={})
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orig = LXC::Container.new(original_container_name)
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dest = LXC::Container.new(target_container_name)
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raise "#{original_container_name} is not present. Exiting.." unless orig.defined?
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raise "#{target_container_name} is already present. Exiting.." if dest.defined?
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dest_path = File.join(LXC.global_config_item('lxc.lxcpath'), target_container_name)
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Dir.mkdir(dest_path, 0770)
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dest.load_config(orig.config_file_name)
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dest.set_config_item("lxc.utsname", dest.name)
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dest.set_config_item("lxc.rootfs", File.join(dest_path, "rootfs"))
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dest.config_item("lxc.network").each_with_index do |network_type, index|
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dest.set_config_item("lxc.network.#{index}.hwaddr", random_mac) if dest.config_item("lxc.network.#{index}.hwaddr")
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end
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create_pre_mount(orig, dest, opts)
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create_post_stop(orig, dest, opts)
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dest.save_config
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dest.start(daemonize: opts[:daemonize])
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if !dest.wait(:running, 5)
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dest.stop
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dest.destroy if dest.defined?
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raise "The container '#{dest.name}' failed to start."
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end
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end
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private
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def new_overlay?
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@new_overlay ||= File.readlines('/proc/filesystems').include?("nodev\toverlay\n")
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end
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def random_mac
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mac = [0x00, 0x16, 0x3e,
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SecureRandom.random_number(0x7f),
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SecureRandom.random_number(0xff),
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SecureRandom.random_number(0xff)
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]
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mac.map {|number| number.to_s(16) }.join(':')
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end
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def create_pre_mount(orig, dest, opts)
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dest_path = File.join(LXC.global_config_item('lxc.lxcpath'), dest.name)
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overlay_dirs = [[orig.config_item("lxc.rootfs"), File.join(dest_path, "rootfs")]]
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File.open(File.join(dest_path, 'pre-mount'), 'w+', 0755) do |pre_mount|
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pre_mount.puts "#!/bin/sh"
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pre_mount.puts %Q{LXC_DIR="#{dest_path}"}
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pre_mount.puts %Q{LXC_BASE="#{orig.name}"}
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pre_mount.puts %Q{LXC_NAME="#{dest.name}"}
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overlay_dirs.each_with_index do |entry, count|
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tmpdir = File.join(dest_path, 'tmpfs')
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pre_mount.puts "mkdir -p #{tmpdir}"
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deltdir = File.join(tmpdir, "/delta#{count}")
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workdir = File.join(tmpdir, "/work#{count}")
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pre_mount.puts "mkdir -p #{deltdir} #{entry[1]} #{workdir if new_overlay?}"
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pre_mount.puts "getfacl -a #{entry[0]} | setfacl --set-file=- #{deltdir} || true"
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pre_mount.puts "getfacl -a #{entry[0]} | setfacl --set-file=- #{entry[1]} || true"
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if new_overlay?
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pre_mount.puts "mount -n -t overlay -oupperdir=#{deltdir},lowerdir=#{entry[0]},workdir=#{workdir} none #{entry[1]}"
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else
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pre_mount.puts "mount -n -t overlayfs -oupperdir=#{deltdir},lowerdir=#{entry[0]} none #{entry[1]}"
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end
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end
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opts[:bdir].each do |host_entry, container_entry|
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if Dir.exists?(host_entry)
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src_path = File.absolute_path(host_entry)
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dst_path = File.join(dest_path, 'rootfs', container_entry)
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pre_mount.puts "mkdir -p #{dst_path}"
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pre_mount.puts "mount -n --bind #{src_path} #{dst_path}"
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else
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raise "Couldn't locate #{host_entry} on the host"
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end
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end
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pre_mount.puts %Q{[ -e $LXC_DIR/configured ] && exit 0}
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pre_mount.puts %Q{for file in $LXC_DIR/rootfs/etc/hostname \\}
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pre_mount.puts %Q{ $LXC_DIR/rootfs/etc/hosts \\}
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pre_mount.puts %Q{ $LXC_DIR/rootfs/etc/sysconfig/network \\}
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pre_mount.puts %Q{ $LXC_DIR/rootfs/etc/sysconfig/network-scripts/ifcfg-eth0; do}
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pre_mount.puts %Q{ [ -f "$file" ] && sed -i -e "s/$LXC_BASE/$LXC_NAME/" $file}
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pre_mount.puts %Q{done}
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pre_mount.puts %Q{touch $LXC_DIR/configured}
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end
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dest.set_config_item("lxc.hook.pre-mount", File.join(dest_path, "pre-mount"))
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end
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def create_post_stop(orig, dest, opts)
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dest_path = File.join(LXC.global_config_item('lxc.lxcpath'), dest.name)
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File.open(File.join(dest_path, 'post-stop'), 'w+', 0755) do |post_stop|
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post_stop.puts %Q{[ -d #{dest_path} ] && rm -Rf "#{dest_path}"}
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end
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dest.set_config_item("lxc.hook.post-stop", File.join(dest_path, "post-stop"))
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end
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end
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end
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