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|
#!/usr/bin/ruby
# encoding: UTF-8
#
# Restore a file from the most recent backup, from the remote host.
#
$LOAD_PATH.unshift('/usr/lib/byteback')
$LOAD_PATH.unshift(File.join(File.dirname(__FILE__), '../lib')) # For development
require 'trollop'
require 'byteback/util'
require 'byteback/log'
require 'byteback/restore'
include Byteback::Util
include Byteback::Log
#
# Run a remote command.
#
def ssh(*ssh_args)
args = ['ssh',
'-o', 'BatchMode=yes',
'-o', 'ConnectionAttempts=5',
'-o', 'ConnectTimeout=30',
'-o', 'ServerAliveInterval=60',
'-o', 'TCPKeepAlive=yes',
'-x', '-a',
'-i', @ssh_key,
'-l', @destination_user,
@destination_host
] +
ssh_args.map { |a| a ? a : '' }
puts args.join(" " ) if @verbose
system(*args)
end
def list_files(pattern, snapshot, all)
args = ['byteback-receive', '--snapshot', snapshot, '--list']
args << "--all" if all
args << @verbose if @verbose
args += Byteback::Restore.encode_args(pattern)
ssh(*args)
end
#
# We cannot use plain 'rsync' here because the receiving-command will
# see that, and rewrite our arguments.
#
# To cater to this we have to wrap the rsync for the restore and we
# do that by setting "rsync-path" to point to a faux script.
#
#
def restore_files(paths, snapshot, all)
#
# Basic args
#
args = %w(rsync --archive --numeric-ids --inplace --relative --compress)
#
# Add on the I/O-timeout
#
args += ['--timeout', @io_timeout.to_s ] unless ( @io_timeout.nil? )
args += ['--rsh', "ssh -o BatchMode=yes -x -a -i #{@ssh_key} -l #{@destination_user}"]
args << '--verbose' if @verbose
args += ['--rsync-path', "byteback-restore --fake-super --snapshot #{snapshot}" + (all ? " --all" : "")]
#
# To add extra rsync flags, a file can be used. This can have flags all on one line, or one per line.
#
if File.exists?("/etc/byteback/rsync_flags")
args += File.readlines("/etc/byteback/rsync_flags").map(&:chomp)
end
dst = "#{@destination_user}@#{@destination_host}:"
paths.each do |path|
path = Byteback::Restore.encode_args(path).first
args << File.join(dst,path)
dst = ":"
end
args << "."
puts args.join(" " ) if @verbose
system(*args)
end
##
## Entry-point to our code.
##
if __FILE__ == $PROGRAM_NAME
ME = File.basename($PROGRAM_NAME)
#
# Parse our command-line arguments
#
opts = Trollop.options do
banner "#{ME}: Restore a file to this system from a byteback-enabled server\n "
opt :list, "List or find files on the backup server. This is the default mode."
opt :restore, "Restore files from the backup server."
opt :snapshot, "The specific snapshot to use",
:type => :string, :default => "*"
opt :destination, 'Backup destination (i.e. user@host:/path)',
:type => :string
opt :io_timeout, 'Number of seconds to allow I/O to timeout',
:type => :integer,
:default => 300
opt :ssh_key, 'SSH key filename',
:type => :string,
:default => '/etc/byteback/key',
:short => 'k'
opt :all, 'List or restore all versrions of each file',
:short => 'a'
opt :verbose, 'Show more output'
end
#
# Make sure we know what we're doing.
#
fatal("Please choose either --list or --restore") if opts[:list] and opts[:restore]
@verbose = opts[:verbose] ? '--verbose' : nil
@io_timeout = opts[:io_timeout] if opts[:io_timeout]
# Read the default destination
if File.exist?('/etc/byteback/destination')
@destination = File.read('/etc/byteback/destination').chomp
end
# Set the default SSH key
if File.exist?('/etc/byteback/key')
@ssh_key = '/etc/byteback/key'
end
#
# Allow the command-line to override them.
#
@ssh_key = opts[:ssh_key] unless opts[:ssh_key].nil?
@destination = opts[:destination] unless opts[:destination].nil?
#
# Check our destination
#
fatal('Must suply --destination or put it into /etc/bytebackup/destination') unless @destination
#
# Check our destination is well-formed
#
if @destination =~ /^(?:(.+)@)?([^@:]+):(.+)?$/
@destination_user, @destination_host, @destination_path = [Regexp.last_match(1), Regexp.last_match(2), Regexp.last_match(3)]
else
fatal('Destination must be a remote path, e.g. ssh@host.com:/store/backups')
end
#
# Test that we have an SSH-key which we can read.
#
fatal("Could not read ssh key #{@ssh_key}") unless File.readable?(@ssh_key)
#
# If the user didn't specify a file then we're not restoring anything,
# and we should abort.
#
if ARGV.empty?
fatal('You must specify a file to search/restore')
end
if opts[:restore]
#
# Restore a file
#
restore_files(ARGV.collect{|a| File.expand_path(a)}, opts[:snapshot], opts[:all])
exit(0)
end
list_files(ARGV.collect{|a| File.expand_path(a)}, opts[:snapshot], opts[:all])
exit(0)
end
|
