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#!/usr/lib/env ruby | |
# Acquires a shared lock on a SQLite database file and copies it to a backup | |
# usage: backup-db.rb DBFILE.db BACKUPFILE.db | |
# author: William Benton (willb@redhat.com) | |
# Public domain. | |
require 'sqlite3' | |
require 'fileutils' | |
def backup_db(db_file, backup_file) | |
begin | |
db = SQLite3::Database.new(db_file) | |
db.transaction(:immediate) do |ignored| | |
# starting a transaction with ":immediate" means we get a shared lock | |
# and thus any db writes (unlikely!) complete before we copy the file | |
FileUtils.cp(db_file, backup_file, :preserve=>true) | |
end | |
ensure | |
db.close | |
end | |
end | |
backup_db(ARGV[0], ARGV[1]) |
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