Encode our upgrade policy in productMatches/versionMatches and enforce it.

For Fedora, this means we will not allow upgrades of detected root filesystems
more than two releases old, or "upgrading" a newer install with an older one.
For RHEL, we don't yet know what to do so just allow things to continue as they
always have.  Using "upgradeany" still circumvents this check.

1 files changed, 9 insertions, 0 deletions

diff --git a/installclass.py b/installclass.py
index c36e9e9bf..a3a97aed5 100644
--- a/installclass.py
+++ b/installclass.py
@@ -213,6 +213,15 @@ class BaseInstallClass(object):
 	anaconda.id.reset()
 	anaconda.id.instClass = self
 
+    def versionMatches(self, oldver):
+        pass
+
+    def productMatches(self, oldprod):
+        pass
+
+    def productUpgradable(self, oldprod, oldver):
+        return self.productMatches(oldprod) and self.versionMatches(oldver)
+
     def __init__(self):
 	pass