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require 'erb'
require 'fileutils'
require_relative 'resource'
module RCM
class DNFPackageManager
# Raised when a dnf subcommand exits with a non-zero status or when
# the dnf binary cannot be found.
class CommandFailed < StandardError; end
def installed?(pkg) = false
def install(pkg)
return if installed?(pkg)
run_dnf!('install', pkg)
end
def update(pkg)
run_dnf!('update', pkg)
end
def remove(pkg)
return unless installed?(pkg)
run_dnf!('remove', pkg)
end
private
# Execute dnf <subcommand> -y <pkg> using separate arguments (no shell
# interpolation). Raises CommandFailed when dnf exits non-zero or is
# not found ($? is nil when the binary cannot be exec'd).
def run_dnf!(subcommand, pkg)
result = system('dnf', subcommand, '-y', pkg)
return if result
exit_code = $?&.exitstatus || '?'
raise CommandFailed, "dnf #{subcommand} #{pkg} failed (exit #{exit_code})"
end
end
# Managing packages
class Package < Resource
attr_reader :path
class UnsupportedOS < StandardError; end
def initialize(name)
super(name)
# Use ::File to avoid resolving to RCM::File once file.rb is loaded.
raise UnsupportedOS, 'OS is not supported' unless ::File.file?('/etc/fedora-release')
@manager = DNFPackageManager.new
@name = name
end
def packages(*pks)
raise 'Not yet implemented'
end
def evaluate!
nil unless super
end
end
# Add file keyword to the DSL
class DSL
def package(name, &block)
return unless @conds_met
f = Package.new(name)
f.packages(f.instance_eval(&block))
self << f
f
end
end
end
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