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# encoding: utf-8
require_relative "helpers/os_common"
module Train::Platforms::Detect
class Scanner
include Train::Platforms::Detect::Helpers::OSCommon
def initialize(backend)
@backend = backend
@platform = {}
@family_hierarchy = []
# detect cache variables
@files = {}
@uname = {}
@lsb = {}
@cache = {}
end
# Main detect method to scan all platforms for a match
#
# @return Train::Platform instance or error if none found
def scan
# start with the platform/families who have no families (the top levels)
top = Train::Platforms.top_platforms
top.each do |_name, plat|
# we are doing a instance_eval here to make sure we have the proper
# context with all the detect helper methods
next unless instance_eval(&plat.detect)
# if we have a match start looking at the children
plat_result = scan_children(plat)
next if plat_result.nil?
# return platform to backend
@family_hierarchy << plat.name
return get_platform(plat_result)
end
raise Train::PlatformDetectionFailed, "Sorry, we are unable to detect your platform"
end
def scan_children(parent)
parent.children.each do |plat, condition|
next unless instance_eval(&plat.detect)
if plat.class == Train::Platforms::Platform
return plat if condition.empty? || check_condition(condition)
elsif plat.class == Train::Platforms::Family
plat = scan_family_children(plat)
return plat unless plat.nil?
end
end
nil
end
def scan_family_children(plat)
child_result = scan_children(plat) unless plat.children.nil?
return if child_result.nil?
@family_hierarchy << plat.name
child_result
end
def check_condition(condition)
condition.each do |k, v|
op, expected = v.strip.split(" ")
op = "==" if op == "="
return false if @platform[k].nil? || !instance_eval("'#{@platform[k]}' #{op} '#{expected}'")
end
true
end
def get_platform(plat)
plat.backend = @backend
plat.platform = @platform
plat.add_platform_methods
plat.family_hierarchy = @family_hierarchy
plat
end
end
end
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