# Rex tasks for Rocky Linux r-nodes (r0, r1, r2) — k3s cluster VMs.
#
# Run from repository root:
#   rex -f f3s/r-nodes/Rexfile nfs_mount_monitor
#
# All tasks connect as root (r-nodes require root for systemd and
# /usr/local/bin writes; paul user has no sudo configured on these VMs).

use Rex -feature => [ '1.14', 'exec_autodie' ];
use Rex::Logger;
use File::Basename qw(dirname);
use File::Spec::Functions qw(catfile rel2abs);

my $RNODES_DIR = dirname( rel2abs(__FILE__) );

# All three k3s Rocky Linux VMs; root SSH is configured via authorized_keys.
group r_nodes => qw(
  192.168.1.120
  192.168.1.121
  192.168.1.122
);

user 'root';
sudo FALSE;

# Deploy in parallel — tasks are idempotent and independent per node.
parallelism 3;

# Deploy the NFS mount health-monitor script and its systemd units to
# all three r-nodes, then reload systemd and restart the timer so the
# new files take effect immediately.
#
# Files managed:
#   /usr/local/bin/check-nfs-mount.sh       (monitor + auto-repair script)
#   /etc/systemd/system/nfs-mount-monitor.service
#   /etc/systemd/system/nfs-mount-monitor.timer
#
# Idempotent: Rex only writes the file when content changes; the
# on_change handler reloads systemd and restarts the timer only when
# something actually changed.
desc 'Deploy NFS mount monitor script and systemd units to r0/r1/r2';
task 'nfs_mount_monitor',
  group => 'r_nodes',
  sub {
    my $monitor_dir = catfile( $RNODES_DIR, 'nfs-mount-monitor' );

    # Reload flag — set to 1 if any file changed, so we only reload once.
    my $changed = 0;

    # Deploy the health-monitor script.
    file '/usr/local/bin/check-nfs-mount.sh',
      source    => catfile( $monitor_dir, 'check-nfs-mount.sh' ),
      owner     => 'root',
      group     => 'root',
      mode      => '755',
      on_change => sub { $changed = 1 };

    # Deploy the systemd service unit.
    file '/etc/systemd/system/nfs-mount-monitor.service',
      source    => catfile( $monitor_dir, 'nfs-mount-monitor.service' ),
      owner     => 'root',
      group     => 'root',
      mode      => '644',
      on_change => sub { $changed = 1 };

    # Deploy the systemd timer unit.
    file '/etc/systemd/system/nfs-mount-monitor.timer',
      source    => catfile( $monitor_dir, 'nfs-mount-monitor.timer' ),
      owner     => 'root',
      group     => 'root',
      mode      => '644',
      on_change => sub { $changed = 1 };

    if ($changed) {
        Rex::Logger::info('Files changed — reloading systemd and restarting timer');
        run 'systemctl daemon-reload';
        run 'systemctl restart nfs-mount-monitor.timer';
    }

    # Ensure the timer is enabled and running regardless of whether files changed.
    service 'nfs-mount-monitor.timer', ensure => 'started';
    run 'systemctl enable nfs-mount-monitor.timer';
  };

1;

# vim: syntax=perl