Gem cycling using md5 hashes
I have a directory containing gems, and I often change them. To save myself the task of manually re-installing each one whenever anything changes, I wrote a simple script which keeps track of the files and runs rake tasks whenever any is modified.
The script is almost self-explanatory, but here’s the gist:
- first time you run it, it writes a YAML file with a big hash of a relevant files and their hashes
- after that, it performs the same md5 hashes and if the hash has changed it runs rake gem:uninstall rake gem:repackage rake gem:install in the directory where the change was noticed, then rewrites the hash.
It’s pretty scrappy, and needs to be placed and run from the base dir of the gems. And it doesn’t check manifests, yet.
require 'pathname' require 'find' require 'digest/md5' require 'yaml' = [] @new = {} = [] = ENV['PWD'] def get_new_file_list Dir.chdir Find.find('./') do |f| << f end .delete_if {|e| e.split('/').size == 2 } # ie in root dir .delete_if {|e| e.include?('pkg') } # ignore build dirs end def recurse_files @new = {} .each do |f| if !FileTest.directory?(f) && File.exists?(f) @new[f] = Digest::MD5.hexdigest(File.read(f)) end end end def write_new Dir.chdir File.open("md5.yaml", "w+") do |file| file.write @new.to_yaml end end def differences newclone = @new.clone oldclone = @old.clone newclone.delete_if {|key, value| @old[key] == value } oldclone.delete_if {|key, value| @new[key] == value } diff = newclone.merge(oldclone) diff.keys.each do |k| << k.split('/')[1] end .uniq! end def cycle_gem gem_dir puts "updating #{gem_dir}..." dir = + '/' + gem_dir Dir.chdir(dir) system('rake gem:uninstall') system('rake gem:repackage') system('rake gem:install') end get_new_file_list recurse_files if File::exists?('md5.yaml') @old = YAML.load_file('md5.yaml') differences else write_new end if .size > 0 .each do |g| cycle_gem g end get_new_file_list recurse_files write_new puts "updated #{.join(' ')}" else puts "nothing to update" end
Tags: ruby, scripts