md5 allow copy if file is missing

library/copy

@@ -66,29 +66,26 @@ if src:
 if dest:
     dest = os.path.expanduser(dest)
 
+md5sum_src = None
 # raise an error if there is no src file
 if not os.path.exists(src):
         exit_kv(rc=1, failed=1, msg="Source %s failed to transfer" % (src))
-
-# raise an error if there is no dest file
-if not os.path.exists(dest):
-    exit_kv(rc=1, failed=1, msg="Destination %s does not exist" % (dest))
-
-# raise an error if copy has no permission on dest
-if not os.access(dest, os.W_OK):
-    exit_kv(rc=1, failed=1, msg="Destination %s not writable" % (dest))
-elif not os.access(dest, os.R_OK):
-    exit_kv(rc=1, failed=1, msg="Destination %s not readable" % (dest))
-
-md5sum_src = None
+if not os.access(src, os.R_OK):
+    exit_kv(rc=1, failed=1, msg="Source %s not readable" % (src))
 md5sum_src = md5_sum(src)
 
 md5sum_dest = None
-try:
+# check if there is no dest file
+if os.path.exists(dest):
+    # raise an error if copy has no permission on dest
+    if not os.access(dest, os.W_OK):
+        exit_kv(rc=1, failed=1, msg="Destination %s not writable" % (dest))
+    if not os.access(dest, os.R_OK):
+        exit_kv(rc=1, failed=1, msg="Destination %s not readable" % (dest))
     md5sum_dest = md5_sum(dest)
-except IndexError:
-    # File doesn't exist yet, so clear to continue
-    pass
+else:
+    if not os.access(os.path.dirname(dest), os.W_OK):
+        exit_kv(rc=1, failed=1, msg="Destination %s not writable" % (dest))
 
 if md5sum_src != md5sum_dest:
     os.system("cp %s %s" % (src, dest))
@@ -97,6 +94,6 @@ else:
     changed = False
 
 # mission accomplished
-#print "md5sum=%s changed=%s" % (md5sum_dest, changed)
-exit_kv(dest=dest, src=src, changed="md5sum=%s changed=%s" % (md5sum_dest, changed))
+#print "md5sum=%s changed=%s" % (md5sum_src, changed)
+exit_kv(dest=dest, src=src, changed="md5sum=%s changed=%s" % (md5sum_src, changed))