diff --git a/pym/calculate/lib/utils/portage.py b/pym/calculate/lib/utils/portage.py
index edce2bb..3fe8c1a 100644
--- a/pym/calculate/lib/utils/portage.py
+++ b/pym/calculate/lib/utils/portage.py
@@ -40,6 +40,7 @@ from .common import getTupleVersion
 from contextlib import closing
 from functools import total_ordering
 from itertools import ifilter, imap, chain, groupby
+import hashlib
 
 Colors = TextState.Colors
 import glob
@@ -1789,3 +1790,38 @@ def clear_binhost_garbage(dn):
                    fullpath=True):
         if fn.endswith(".portage.lockfile") or fn.endswith(".partial"):
             os.unlink(fn)
+
+class PortageState(object):
+    """
+    Подсчёт контрольной суммы для определения изменений /etc/portage
+    """
+    paths = ["/etc/portage", "/var/log/emerge.log"]
+
+    def __init__(self, prefix='/'):
+        self.prefix = prefix
+
+    def readFileContent(self, fn):
+        if fn.endswith("/var/log/emerge.log"):
+            return readFile(fn)[:-200]
+        return readFile(fn)
+
+    def getpathdata(self, fn):
+        yield "%s"%fn
+        if path.lexists(fn):
+            if path.islink(fn):
+                yield os.readlink(fn)
+            elif path.isdir(fn):
+                for x in os.listdir(fn):
+                    dfn = pathJoin(fn, x)
+                    for dirdata in self.getpathdata(dfn):
+                        yield dirdata
+            else:
+                yield readFile(fn)
+
+    def get_state(self):
+        m = hashlib.md5()
+        for dn in self.paths:
+            fdn = pathJoin(self.prefix, dn)
+            for data in self.getpathdata(fdn):
+                m.update(data)
+        return m.hexdigest()