New plugin for making vsys scripts PLC-controllable.

diff --git a/plugins/vsys_privs.py b/plugins/vsys_privs.py
new file mode 100755 (executable)
index 0000000..2dad075
--- /dev/null
+++ b/plugins/vsys_privs.py
@@ -0,0 +1,122 @@
+"""
+vsys sub-configurator.  Maintains configuration parameters associated with vsys scripts.
+All slice attributes with the prefix vsys_ are written into configuration files on the
+node for the reference of vsys scripts.
+"""
+
+import logger
+import os
+from sets import Set
+
+VSYS_PRIV_DIR = "/etc/planetlab/vsys-attributes"
+
+def start(options, conf):
+    logger.log("vsys_privs plugin v0.1")
+    if (not os.path.exists(VSYS_PRIV_DIR)):
+        os.makedirs(VSYS_PRIV_DIR)
+        logger.log("Created vsys attributes dir")
+
+def GetSlivers(data, config=None, plc=None):
+    privs = {}
+
+    # Parse attributes and update dict of scripts
+    for sliver in data['slivers']:
+        slice = sliver['name']
+        for attribute in sliver['attributes']:
+            tag = attribute['tagname']
+            value = attribute['value']
+            if tag.startswith('vsys_'):
+                if (privs.has_key(slice)):
+                    slice_priv = privs[slice]
+                    if (slice_priv.has_key(tag)):
+                        slice_priv[tag].append(value)
+                    else:
+                        slice_priv[tag]=[value]
+
+                    privs[slice] = slice_priv
+                else:
+                    privs[slice] = {tag:[value]}
+
+    cur_privs = read_privs()
+    write_privs(cur_privs, privs)
+
+def read_privs():
+    cur_privs={}
+    priv_finder = os.walk(VSYS_PRIV_DIR)
+    priv_find = [i for i in priv_finder]
+    (rootdir,slices,foo) = priv_find[0]
+
+    for slice in slices:
+        cur_privs[slice]={}
+
+    if (len(priv_find)>1):
+        for (slicedir,bar,tagnames) in priv_find[1:]:
+            if (bar != []):
+                # The depth of the vsys-privileges directory = 1
+                pass
+
+            for tagname in tagnames:
+                tagfile = os.path.join(slicedir,tagname)
+                values_n = file(tagfile).readlines()
+                values = map(lambda s:s.rstrip(),values_n)
+                slice = os.path.basename(slicedir)
+                cur_privs[slice][tagname]=values
+
+    return cur_privs
+
+def write_privs(cur_privs,privs):
+    for slice in privs.keys():
+        variables = privs[slice]
+        slice_dir = os.path.join(VSYS_PRIV_DIR,slice)
+        if (not os.path.exists(slice_dir)):
+            os.mkdir(slice_dir)
+
+        # Add values that do not exist
+        for k in variables.keys():
+            v = variables[k]
+            if (cur_privs.has_key(slice) 
+                    and cur_privs[slice].has_key(k)
+                    and cur_privs[slice][k] == v):
+                # The binding has not changed
+                print "Binding for %s, %s has not changed"%(slice,k) 
+                pass
+            else:
+                v_file = os.path.join(slice_dir, k)
+                f = open(v_file,'w')
+                data = '\n'.join(v)
+                f.write(data)
+                f.close()
+
+    # Remove files and directories 
+    # that are invalid
+    for slice in cur_privs.keys():
+        variables = cur_privs[slice]
+        slice_dir = os.path.join(VSYS_PRIV_DIR,slice)
+
+        # Add values that do not exist
+        for k in variables.keys():
+            if (privs.has_key(slice) 
+                    and cur_privs[slice].has_key(k)):
+                # ok, spare this tag
+                print "Sparing  %s, %s "%(slice,k) 
+            else:
+                v_file = os.path.join(slice_dir, k)
+                os.remove(v_file)    
+
+        if (not privs.has_key(slice)):
+            os.rmdir(slice_dir)
+
+
+if __name__ == "__main__":           
+    test_slivers = {'slivers':[
+        {'name':'foo','attributes':[
+            {'tagname':'vsys_m','value':'2'},
+            {'tagname':'vsys_m','value':'3'},
+            {'tagname':'vsys_m','value':'4'}
+            ]},
+        {'name':'bar','attributes':[
+            #{'tagname':'vsys_x','value':'z'}
+            ]}
+        ]}
+    start(None,None)
+    GetSlivers(test_slivers)