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module GPGME
##
# Convenience methods to check different aspects of the gpg system
# installation.
module Engine
class << self
##
# Verify that the engine implementing the protocol +proto+ is installed in
# the system. Can be one of +PROTOCOL_OpenPGP+ or +PROTOCOL_CMS+.
#
# @return [Boolean] true if the engine is installed.
#
# @example
# GPGME::Engine.check_version(GPGME::PROTOCOL_OpenPGP) # => true
#
def check_version(proto)
err = GPGME::gpgme_engine_check_version(proto)
exc = GPGME::error_to_exception(err)
!exc
end
##
# Return an array of {GPGME::EngineInfo} structures of enabled engines.
#
# @example
# GPGME::Engine.info.first
# # => #<GPGME::EngineInfo:0x00000100d4fbd8
# @file_name="/usr/local/bin/gpg",
# @protocol=0,
# @req_version="1.3.0",
# @version="1.4.11">
#
def info
rinfo = []
GPGME::gpgme_get_engine_info(rinfo)
rinfo
end
##
# Change the default configuration of the crypto engine implementing
# protocol +proto+.
#
# @param proto
# Can be one of +PROTOCOL_OpenPGP+ or +PROTOCOL_CMS+.
#
# @param file_name
# The file name of the executable program implementing the protocol.
#
# @param home_dir
# The directory name of the configuration directory.
#
# @example
# GPGME::Engine.set_info(GPGME::PROTOCOL_OpenPGP, '/usr/local/bin/gpg', home_dir)
#
def set_info(proto, file_name, home_dir)
err = GPGME::gpgme_set_engine_info(proto, file_name, home_dir)
exc = GPGME::error_to_exception(err)
raise exc if exc
end
##
# Sets the home dir for the configuration options. This way one could,
# for example, load the keys from a customized keychain.
#
# @example
# GPGME::Engine.home_dir = '/tmp'
#
def home_dir=(home_dir)
current = info.first
set_info current.protocol, current.file_name, home_dir
end
##
# Return the default configuration.
#
# @example
# GPGME::Engine.dirinfo('homedir')
# # => '/home/user/.gnupg"
#
def dirinfo(what)
GPGME::gpgme_get_dirinfo(what)
end
end # class << self
end # class Engine
end # module GPGME
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