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require 'rubygems/command'
require 'rubygems/format'
require 'rubygems/installer'
require 'rubygems/version_option'
class Gem::Commands::PristineCommand < Gem::Command
include Gem::VersionOption
def initialize
super 'pristine',
'Restores installed gems to pristine condition from files located in the gem cache',
:version => Gem::Requirement.default, :extensions => true,
:all => false
add_option('--all',
'Restore all installed gems to pristine',
'condition') do |value, options|
options[:all] = value
end
add_option('--[no-]extensions',
'Restore gems with extensions') do |value, options|
options[:extensions] = value
end
add_version_option('restore to', 'pristine condition')
end
def arguments # :nodoc:
"GEMNAME gem to restore to pristine condition (unless --all)"
end
def defaults_str # :nodoc:
"--all --extensions"
end
def description # :nodoc:
<<-EOF
The pristine command compares the installed gems with the contents of the
cached gem and restores any files that don't match the cached gem's copy.
If you have made modifications to your installed gems, the pristine command
will revert them. After all the gem's files have been checked all bin stubs
for the gem are regenerated.
If the cached gem cannot be found, you will need to use `gem install` to
revert the gem.
If --no-extensions is provided pristine will not attempt to restore gems with
extensions.
EOF
end
def usage # :nodoc:
"#{program_name} [args]"
end
def execute
specs = if options[:all] then
Gem::Specification.map
else
get_all_gem_names.map do |gem_name|
Gem::Specification.find_all_by_name gem_name, options[:version]
end.flatten
end
if specs.to_a.empty? then
raise Gem::Exception,
"Failed to find gems #{options[:args]} #{options[:version]}"
end
install_dir = Gem.dir # TODO use installer option
raise Gem::FilePermissionError.new(install_dir) unless
File.writable?(install_dir)
say "Restoring gems to pristine condition..."
specs.each do |spec|
unless spec.extensions.empty? or options[:extensions] then
say "Skipped #{spec.full_name}, it needs to compile an extension"
next
end
gem = spec.cache_file
unless File.exist? gem then
require 'rubygems/remote_fetcher'
say "Cached gem for #{spec.full_name} not found, attempting to fetch..."
dep = Gem::Dependency.new spec.name, spec.version
Gem::RemoteFetcher.fetcher.download_to_cache dep
end
# TODO use installer options
installer = Gem::Installer.new(gem,
:wrappers => true,
:force => true,
:install_dir => spec.base_dir)
installer.install
say "Restored #{spec.full_name}"
end
end
end
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