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require 'rubygems/command'
require 'rubygems/package'
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,
:extensions_set => false,
: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',
'in addition to regular gems') do |value, options|
options[:extensions_set] = true
options[:extensions] = value
end
add_option('--only-executables',
'Only restore executables') do |value, options|
options[:only_executables] = value
end
add_option('-E', '--[no-]env-shebang',
'Rewrite executables with a shebang',
'of /usr/bin/env') do |value, options|
options[:env_shebang] = 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:
'--extensions'
end
def description # :nodoc:
<<-EOF
The pristine command compares an installed gem with the contents of its
cached .gem file and restores any files that don't match the cached .gem's
copy.
If you have made modifications to an installed gem, the pristine command
will revert them. All extensions are rebuilt and all bin stubs for the gem
are regenerated after checking for modifications.
If the cached gem cannot be found it will be downloaded.
If --no-extensions is provided pristine will not attempt to restore a gem
with an extension.
If --extensions is given (but not --all or gem names) only gems with
extensions will be restored.
EOF
end
def usage # :nodoc:
"#{program_name} [GEMNAME ...]"
end
def execute
specs = if options[:all] then
Gem::Specification.map
# `--extensions` must be explicitly given to pristine only gems
# with extensions.
elsif options[:extensions_set] and
options[:extensions] and options[:args].empty? then
Gem::Specification.select do |spec|
spec.extensions and not spec.extensions.empty?
end
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|
if spec.default_gem?
say "Skipped #{spec.full_name}, it is a default gem"
next
end
if spec.bundled_gem_in_old_ruby?
say "Skipped #{spec.full_name}, it is bundled with old Ruby"
next
end
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
found, _ = Gem::SpecFetcher.fetcher.spec_for_dependency dep
if found.empty?
say "Skipped #{spec.full_name}, it was not found from cache and remote sources"
next
end
spec_candidate, source = found.first
Gem::RemoteFetcher.fetcher.download spec_candidate, source.uri.to_s, spec.base_dir
end
env_shebang =
if options.include? :env_shebang then
options[:env_shebang]
else
install_defaults = Gem::ConfigFile::PLATFORM_DEFAULTS['install']
install_defaults.to_s['--env-shebang']
end
installer = Gem::Installer.new(gem,
:wrappers => true,
:force => true,
:install_dir => spec.base_dir,
:env_shebang => env_shebang,
:build_args => spec.build_args)
if options[:only_executables] then
installer.generate_bin
else
installer.install
end
say "Restored #{spec.full_name}"
end
end
end
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