[ssh] Stop collecting 'ls' information from non-local home dirs

Commands like 'ls -laZ' can take some time to run in remote filesystems,
for example NFS. When you have hundreds of them, sos can take a long
time to walk through it, and could be even worse if we use the option
'recursive'.
For ssh home dirs, we don't need the listing, so in this patch we detect
the type of filesystem and run the command only on local ones.

Related: RHEL-22389, SUPDEV-156

Signed-off-by: Jose Castillo <[email protected]>

sos/report/plugins/ssh.py

@@ -80,8 +80,21 @@ def user_ssh_files_permissions(self):
         """
         users_data = pwd.getpwall()
 
+        fs_mount_info = {}
+        try:
+            with open('/proc/mounts', "r", encoding='UTF-8') as mounts_file:
+                for line in mounts_file:
+                    (fs_file, fs_vstype) = line.split()[1:3]
+                    fs_mount_info[fs_file] = fs_vstype
+        except Exception:
+            self._log_error("Couldn't read /proc/mounts")
+            return
+        non_local_fs = {'nfs', 'nfs4', 'autofs'}
         # Read the home paths of users in the system and check the ~/.ssh dirs
         for user in users_data:
+            if user.pw_dir in fs_mount_info and \
+                    fs_mount_info[user.pw_dir] in non_local_fs:
+                continue
             home_dir = self.path_join(user.pw_dir, '.ssh')
             self.add_dir_listing(home_dir)