diff --git a/spec/mspec/lib/mspec/runner/actions/leakchecker.rb b/spec/mspec/lib/mspec/runner/actions/leakchecker.rb index 69181b71d3..9cf5cefa3f 100644 --- a/spec/mspec/lib/mspec/runner/actions/leakchecker.rb +++ b/spec/mspec/lib/mspec/runner/actions/leakchecker.rb @@ -301,6 +301,7 @@ class LeakCheckerAction end def start + disable_nss_modules @checker = LeakChecker.new end @@ -316,4 +317,58 @@ class LeakCheckerAction end end end + + private + + # This function is intended to disable all NSS modules when ruby is compiled + # against glibc. NSS modules allow the system administrator to load custom + # shared objects into all processes using glibc, and use them to customise + # the behaviour of username, groupname, hostname, etc lookups. This is + # normally configured in the file /etc/nsswitch.conf. + # These modules often do things like open cache files or connect to system + # daemons like sssd or dbus, which of course means they have open file + # descriptors of their own. This can cause the leak-checking functionality + # in this file to report that such descriptors have been leaked, and fail + # the test suite. + # This function uses glibc's __nss_configure_lookup function to override any + # configuration in /etc/nsswitch.conf, and just use the built in files/dns + # name lookup functionality (which is of course perfectly sufficient for + # running ruby/spec). + def disable_nss_modules + begin + require 'fiddle' + rescue LoadError + # Make sure it's possible to run the test suite on a ruby implementation + # which does not (yet?) have Fiddle. + return + end + + begin + libc = Fiddle.dlopen(nil) + nss_configure_lookup = Fiddle::Function.new( + libc['__nss_configure_lookup'], + [Fiddle::Types::CONST_STRING, Fiddle::Types::CONST_STRING], + Fiddle::Types::INT + ) + rescue Fiddle::DLError + # We're not running with glibc - no need to do this. + return + end + + nss_configure_lookup.call 'passwd', 'files' + nss_configure_lookup.call 'shadow', 'files' + nss_configure_lookup.call 'group', 'files' + nss_configure_lookup.call 'hosts', 'files dns' + nss_configure_lookup.call 'services', 'files' + nss_configure_lookup.call 'netgroup', 'files' + nss_configure_lookup.call 'automount', 'files' + nss_configure_lookup.call 'aliases', 'files' + nss_configure_lookup.call 'ethers', 'files' + nss_configure_lookup.call 'gshadow', 'files' + nss_configure_lookup.call 'initgroups', 'files' + nss_configure_lookup.call 'networks', 'files dns' + nss_configure_lookup.call 'protocols', 'files' + nss_configure_lookup.call 'publickey', 'files' + nss_configure_lookup.call 'rpc', 'files' + end end