Specify the level of compression to use.
Values should be a single digit from 1 to 9. Note that setting the level to either extreme may or may not give the desired result. Be sure to check the documentation for the compressor being used.
The default `level` is 6.
Use the `–rsyncable` option with `gzip`.
This option directs `gzip` to compress data using an algorithm that allows `rsync` to efficiently detect changes. This is especially useful when used to compress `Archive` or `Database` backups that will be stored using Backup’s `RSync` Storage option.
The `–rsyncable` option is only available on patched versions of `gzip`. While most distributions apply this patch, this option may not be available on your system. If it’s not available, Backup will log a warning and continue to use the compressor without this option.
Determine if --rsyncable is supported and cache the result.
# File lib/backup/compressor/gzip.rb, line 46 def self.has_rsyncable? return @has_rsyncable unless @has_rsyncable.nil? cmd = "#{ utility(:gzip) } --rsyncable --version >/dev/null 2>&1; echo $?" @has_rsyncable = %[#{ cmd }].chomp == '0' end
Creates a new instance of Backup::Compressor::Gzip
# File lib/backup/compressor/gzip.rb, line 54 def initialize(&block) load_defaults! @level ||= false @rsyncable ||= false instance_eval(&block) if block_given? @cmd = "#{ utility(:gzip) }#{ options }" @ext = '.gz' end
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