#!/bin/bash

# Verify that a file created on a node is readable via NFS after a failover.

# We write a file into an exported directory on a node, mount the NFS
# share from a node, verify that we can read the file via NFS and that
# we can still read it after a failover.

# Prerequisites:

# * An active CTDB cluster with at least 2 nodes with public addresses.

# * Test must be run on a real or virtual cluster rather than against
#   local daemons.

# * Test must not be run from a cluster node.

# Steps:

# 1.  Verify that the cluster is healthy.
# 2.  Select a public address and its corresponding node.
# 3.  Select the 1st NFS share exported on the node.
# 4.  Write a file into exported directory on the node and calculate its
#     checksum.
# 5.  Mount the selected NFS share.
# 6.  Read the file via the NFS mount and calculate its checksum.
# 7.  Compare checksums.
# 8.  Disable the selected node.
# 9.  Read the file via NFS and calculate its checksum.
# 10. Compare the checksums.

# Expected results:

# * Checksums for the file on all 3 occasions should be the same.

. "${TEST_SCRIPTS_DIR}/cluster.bash"

set -e

ctdb_test_init

nfs_test_setup

echo "Create file containing random data..."
local_f=$(mktemp)
ctdb_test_exit_hook_add rm -f "$local_f"
dd if=/dev/urandom of=$local_f bs=1k count=1
local_sum=$(sum $local_f)

scp -p "$local_f" "[${test_ip}]:${nfs_remote_file}"
try_command_on_node $test_node "chmod 644 $nfs_remote_file"

nfs_sum=$(sum $nfs_local_file)

if [ "$local_sum" = "$nfs_sum" ] ; then
    echo "GOOD: file contents read correctly via NFS"
else
    echo "BAD: file contents are different over NFS"
    echo "  original file: $local_sum"
    echo "       NFS file: $nfs_sum"
    exit 1
fi

gratarp_sniff_start

echo "Disabling node $test_node"
try_command_on_node 0 $CTDB disable -n $test_node
wait_until_node_has_status $test_node disabled

gratarp_sniff_wait_show

new_sum=$(sum $nfs_local_file)
[ $? -eq 0 ]

if [ "$nfs_sum" = "$new_sum" ] ; then
    echo "GOOD: file contents unchanged after failover"
else
    echo "BAD: file contents are different after failover"
    echo "  original file: $nfs_sum"
    echo "       NFS file: $new_sum"
    exit 1
fi