find_spec_by_name_and_version(gem_name, version = Gem::Requirement.default, prerelease = false)
public
Finds a spec and the source_uri it came from for gem gem_name and
version. Returns an Array of specs and
sources required for installation of the gem.
# File lib/rubygems/dependency_installer.rb, line 202
def find_spec_by_name_and_version(gem_name,
version = Gem::Requirement.default,
prerelease = false)
spec_and_source = nil
glob = if File::ALT_SEPARATOR then
gem_name.gsub File::ALT_SEPARATOR, File::SEPARATOR
else
gem_name
end
local_gems = Dir["#{glob}*"].sort.reverse
local_gems.each do |gem_file|
next unless gem_file =~ /gem$/
begin
spec = Gem::Format.from_file_by_path(gem_file).spec
spec_and_source = [spec, gem_file]
break
rescue SystemCallError, Gem::Package::FormatError
end
end
unless spec_and_source then
dep = Gem::Dependency.new gem_name, version
dep.prerelease = true if prerelease
spec_and_sources = find_gems_with_sources(dep).reverse
spec_and_source = spec_and_sources.find { |spec, source|
Gem::Platform.match spec.platform
}
end
if spec_and_source.nil? then
raise Gem::GemNotFoundException.new(
"Could not find a valid gem '#{gem_name}' (#{version}) locally or in a repository",
gem_name, version, @errors)
end
@specs_and_sources = [spec_and_source]
end