diff options
Diffstat (limited to 'lib/chef/provider/powershell_script.rb')
| -rw-r--r-- | lib/chef/provider/powershell_script.rb | 51 |
1 files changed, 32 insertions, 19 deletions
diff --git a/lib/chef/provider/powershell_script.rb b/lib/chef/provider/powershell_script.rb index ed44dee6ae..3c52db1f33 100644 --- a/lib/chef/provider/powershell_script.rb +++ b/lib/chef/provider/powershell_script.rb @@ -30,8 +30,8 @@ class Chef end def action_run - valid_syntax = validate_script_syntax! - super if valid_syntax + validate_script_syntax! + super end def flags @@ -62,30 +62,43 @@ class Chef def validate_script_syntax! interpreter_arguments = default_interpreter_flags.join(' ') Tempfile.open(['chef_powershell_script-user-code', '.ps1']) do | user_script_file | - user_script_file.puts("{#{@new_resource.code}}") - user_script_file.close + # Wrap the user's code in a PowerShell script block so that + # it isn't executed. However, syntactically invalid script + # in that block will still trigger a syntax error which is + # exactly what we want here -- verify the syntax without + # actually running the script. + user_code_wrapped_in_powershell_script_block = <<-EOH +{ + #{@new_resource.code} +} +EOH + user_script_file.puts user_code_wrapped_in_powershell_script_block + # A .close or explicit .flush required to ensure the file is + # written to the file system at this point, which is required since + # the intent is to execute the code just written to it. + user_script_file.close validation_command = "\"#{interpreter}\" #{interpreter_arguments} -Command #{user_script_file.path}" - # For consistency with other script resources, allow even syntax errors - # to be suppressed if the returns attribute would have suppressed it - # at converge. - valid_returns = [0] - specified_returns = @new_resource.returns.is_a?(Integer) ? - [@new_resource.returns] : - @new_resource.returns - valid_returns.concat([1]) if specified_returns.include?(1) - - result = shell_out!(validation_command, {returns: valid_returns}) - result.exitstatus == 0 + # Note that other script providers like bash allow syntax errors + # to be suppressed by setting 'returns' to a value that the + # interpreter would return as a status code in the syntax + # error case. We explicitly don't do this here -- syntax + # errors will not be suppressed, since doing so could make + # it harder for users to detect / debug invalid scripts. + + # Therefore, the only return value for a syntactically valid + # script is 0. If an exception is raised by shellout, this + # means a non-zero return and thus a syntactically invalid script. + shell_out!(validation_command, {returns: [0]}) end end def default_interpreter_flags - # 'Bypass' is preferable since it doesn't require user input confirmation - # for files such as PowerShell modules downloaded from the - # Internet. However, 'Bypass' is not supported prior to - # PowerShell 3.0, so the fallback is 'Unrestricted' + # Execution policy 'Bypass' is preferable since it doesn't require + # user input confirmation for files such as PowerShell modules + # downloaded from the Internet. However, 'Bypass' is not supported + # prior to PowerShell 3.0, so the fallback is 'Unrestricted' execution_policy = Chef::Platform.supports_powershell_execution_bypass?(run_context.node) ? 'Bypass' : 'Unrestricted' [ |