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#!/usr/bin/ruby
#
# Program to create a snapshot and/or rotate a directory of backup snapshots
# using btrfs subvolume commands.
$LOAD_PATH.unshift("/usr/lib/byteback")
require 'trollop'
require 'byteback'
include Byteback
include Byteback::Log
opts = Trollop::options do
opt :root, "Backups directory (must be a btrfs subvolume)",
:type => :string
opt :snapshot, "Take a new snapshot"
opt :prune, "Prune old backups (by 'age' or 'importance')",
:type => :string
opt :list, "List backups (by 'age' or 'importance')",
:type => :string
opt :verbose, "Print diagnostics"
end
@root = opts[:root]
@verbose = opts[:verbose]
@do_snapshot = opts[:snapshot]
@do_list = opts[:list]
@do_prune = opts[:prune]
fatal("Must specify snapshot, prune or list") unless @do_snapshot || @do_prune || @do_list
fatal("--root not readable") unless File.directory?("#{@root}")
@backups = BackupDirectory.new(@root)
def get_snapshots_by(method)
if method == 'importance'
@backups.snapshot_times_by_importance.reverse # least important first
elsif method == 'age'
@backups.snapshot_times
else
raise ArgumentError.new("Unknown snapshot sort method #{method}")
end
end
if @do_snapshot
last_snapshot_time = @backups.snapshot_times.last
fatal("Last snapshot was less than six hours ago") unless
!last_snapshot_time ||
Time.now - @backups.snapshot_times.last >= 6*60*60 # FIXME: make configurable
info "Making new snapshot"
@backups.new_snapshot!
end
if @do_list
list = get_snapshots_by(@do_list)
print "Backups in #{@root} by #{@do_list}:\n"
list.each_with_index do |time, index|
print "#{sprintf('% 3d',index)}: #{time}\n"
end
end
if @do_prune
info "Counting last 10 backups"
target_free_space = 1.5 * @backups.average_snapshot_size(10)
info "Want to ensure we have #{target_free_space}"
if @backups.free >= target_free_space
info "(we have #{@backups.free} so no action needed)"
else
list = get_snapshots_by(@do_prune)
while @backups.free < target_free_space && !list.empty?
to_delete = list.pop
info "Deleting #{to_delete}"
@backups.delete_snapshot!(to_delete)
info "Leaves us with #{@backups.free}"
end
end
end
info "Finished"
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