made yaml format backwards compatible

lib/spack/spack/architecture.py

@@ -90,7 +90,7 @@
 from spack.util.environment import get_path
 from spack.util.multiproc import parmap
 import spack.error as serr
-
+import spack.platforms
 
 class InvalidSysTypeError(serr.SpackError):
     def __init__(self, sys_type):
@@ -462,18 +462,24 @@ def arch_from_dict(d):
     """
     arch = Arch()
 
+    if isinstance(d, basestring):
+        # We have an old spec using a string for the architecture
+        arch.platform = spack.platforms.spack_compatibility.SpackCompatibility()
+        arch.platform_os = arch.platform.operating_system('default')
+        arch.target = Target(d)
+
+        arch.os_string = None
+        arch.target_string = None
+    else:
         if d is None:
             return None
         platform_dict = d['platform']
         os_dict = d['platform_os']
         target_dict = d['target']
 
-    platform = _platform_from_dict(platform_dict) if platform_dict else None
+        arch.platform = _platform_from_dict(platform_dict) if platform_dict else None
-    target = _target_from_dict(target_dict) if os_dict else None
+        arch.target = _target_from_dict(target_dict) if os_dict else None
-    platform_os = _operating_system_from_dict(os_dict) if os_dict else None
+        arch.platform_os = _operating_system_from_dict(os_dict) if os_dict else None
-    arch.platform = platform
-    arch.target = target
-    arch.platform_os = platform_os
 
         arch.os_string = None
         arch.target_string = None

lib/spack/spack/operating_systems/pre_v1.py

@@ -0,0 +1,17 @@
+import re
+import os
+
+from spack.architecture import OperatingSystem
+
+
+class PreV1(OperatingSystem):
+    """ Compute Node Linux (CNL) is the operating system used for the Cray XC
+    series super computers. It is a very stripped down version of GNU/Linux.
+    Any compilers found through this operating system will be used with
+    modules. If updated, user must make sure that version and name are 
+    updated to indicate that OS has been upgraded (or downgraded)
+    """
+    def __init__(self):
+        name = 'PreVersion1.0'
+        version = '1.0'
+        super(PreV1, self).__init__(name, version)

lib/spack/spack/platforms/spack_compatibility.py

@@ -0,0 +1,23 @@
+import subprocess
+from spack.architecture import Platform
+from spack.operating_systems.pre_v1
+
+class SpackCompatibility(Platform):
+    priority    = 9999
+
+    # We don't use the normal target getters for this platform
+    # Instead, targets are added directly when parsing the yaml
+
+    # OS is the spack backwards compatibility os.
+    front_os = 'PreVersion1.0'
+    back_os = 'PreVersion1.0'
+    default_os = 'PreVersion1.0'
+
+    def __init__(self):
+        super(SpackCompatibility, self).__init__('spack_compatibility')
+        sc_os = spack.operating_systems.pre_v1.PreV1()
+        self.add_operating_system(sc_os.name, sc_os)
+
+    @classmethod
+    def detect(self):
+        return True