1 files changed, 58 insertions, 0 deletions

diff --git a/meta/lib/oe/cve_check.py b/meta/lib/oe/cve_check.py
new file mode 100644
index 0000000000..ec48a3f829
--- /dev/null
+++ b/meta/lib/oe/cve_check.py
@@ -0,0 +1,58 @@
+import collections
+import re
+import itertools
+
+_Version = collections.namedtuple(
+    "_Version", ["release", "pre_l", "pre_v"]
+)
+
+class Version():
+    _version_pattern =  r"""v?(?:(?P<release>[0-9]+(?:[-\.][0-9]+)*)(?P<pre>[-_\.]?(?P<pre_l>(rc|alpha|beta|pre|preview|dev))[-_\.]?(?P<pre_v>[0-9]+)?)?)(.*)?"""
+    _regex = re.compile(r"^\s*" + _version_pattern + r"\s*$", re.VERBOSE | re.IGNORECASE)
+    def __init__(self, version):
+        match = self._regex.search(version)
+        if not match:
+            raise Exception("Invalid version: '{0}'".format(version))
+
+        self._version = _Version(
+            release=tuple(int(i) for i in match.group("release").replace("-",".").split(".")),
+            pre_l=match.group("pre_l"),
+            pre_v=match.group("pre_v")
+        )
+
+        self._key = _cmpkey(
+            self._version.release,
+            self._version.pre_l,
+            self._version.pre_v
+        )
+
+    def __le__(self, other):
+        if not isinstance(other, Version):
+            return NotImplemented
+        return self._key <= other._key
+
+    def __lt__(self, other):
+        if not isinstance(other, Version):
+            return NotImplemented
+        return self._key < other._key
+
+    def __ge__(self, other):
+        if not isinstance(other, Version):
+            return NotImplemented
+        return self._key >= other._key
+
+    def __gt__(self, other):
+        if not isinstance(other, Version):
+            return NotImplemented
+        return self._key > other._key
+
+def _cmpkey(release, pre_l, pre_v):
+    # remove leading 0
+    _release = tuple(
+        reversed(list(itertools.dropwhile(lambda x: x == 0, reversed(release))))
+    )
+    if pre_l is None and pre_v is None:
+        _pre = float('inf')
+    else:
+        _pre = float(pre_v) if pre_v else float('-inf')
+    return _release, _pre