We have been using bind mounts to select K8s versions, but they are not
well supported by Puppet and suffer from fragility since you cannot
remove a bind mount while an executable is still running from it. They
also need to be re-created when creating an OSTree hotfix or when
applying software patches.
Symlinks suffer from no such issues, they just need to be created in
a filesystem that is not managed by OSTree.
Accordingly, make the current bindmount-related code conditional on
the bindmount directory actually being present. That way the code
will not complain when we switch to using symlinks.
Story: 2011047
Task: 49917
TEST PLAN:
PASS: Run the modified code snippet standalone on system where
/usr/local/kubernetes/current/ exists, ensure it attempts to
run the two mount commands.
PASS: Run the modified code snippet standalone on system where
/usr/local/kubernetes/current/ does not exist, ensure it does not
attempt to run the two mount commands.
Change-Id: I1dfea974ae9532cf316bb1fac701ae93f5507681
5435387623