[policies/redhat] make missing 'filesystem' package non-fatal

On Red Hat systems, we use the version of the installed filesystem'
package to enable handling of UsrMove[1] in the PATH used when
running commands from sos.

If the package is not present (e.g. because of a broken system
configuration, rpm timeout, corrupt database or other cause),
previous versions would fail immediately. In this situation
there was no way for the user to attempt a complete run (short
of fixing the problem related to the 'filesystem' package).

Now that the timeout has been lengthened for this command, make
the UsrMove determination a bit more robust to prevent users from
being unable to run sos at all:

  - If RPM fails entirely, exit (plugin enablement tests will fail)
  - If RPM succeeds but 'filesystem' is missing assume UsrMove
    (this is true for all supported Red Hat distros today)
  - Otherwise apply the normal PATH logic.

Signed-off-by: Bryn M. Reeves <bmr@redhat.com>

1 files changed, 10 insertions, 2 deletions

diff --git a/sos/policies/redhat.py b/sos/policies/redhat.py
index b801b5ed..ec1d9748 100644
--- a/sos/policies/redhat.py
+++ b/sos/policies/redhat.py
@@ -58,13 +58,21 @@ class RedHatPolicy(LinuxPolicy):
 
         pkgs = self.package_manager.all_pkgs()
 
-        # If rpm query timed out after timeout duration exit
+        # If rpm query failed, exit
         if not pkgs:
             print("Could not obtain installed package list", file=sys.stderr)
             sys.exit(1)
 
         # handle PATH for UsrMove
-        if pkgs['filesystem']['version'][0] == '3':
+        if 'filesystem' not in pkgs:
+            print("Could not find 'filesystem' package: "
+                  "assuming PATH settings")
+            usrmove = True
+        else:
+            filesys_version = pkgs['filesystem']['version']
+            usrmove = True if filesys_version[0] == '3' else False
+
+        if usrmove:
             self.PATH = "/usr/sbin:/usr/bin:/root/bin"
         else:
             self.PATH = "/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"