Add add/remove_fstab_entry agent actions (#2352)

Signed-off-by: Nathaniel Clark <nclark@whamcloud.com>

iml-agent/src/action_plugins/action_plugin.rs

@@ -45,6 +45,8 @@ pub fn create_registry() -> action_plugins::Actions {
  .add_plugin("mount_many", lustre::client::mount_many)
  .add_plugin("unmount", lustre::client::unmount)
  .add_plugin("unmount_many", lustre::client::unmount_many)
+ .add_plugin("add_fstab_entry", lustre::client::add_fstab_entry)
+ .add_plugin("remove_fstab_entry", lustre::client::remove_fstab_entry)
  .add_plugin("ha_resource_start", high_availability::start_resource)
  .add_plugin("ha_resource_stop", high_availability::stop_resource)
  .add_plugin("crm_attribute", high_availability::crm_attribute)

iml-agent/src/action_plugins/lustre/client.rs

@@ -104,6 +104,27 @@ pub async fn unmount(unmount: Unmount) -> Result<(), ImlAgentError> {
  .map(drop)
 }
 
+/// This action will attempt to:
+/// - Create the specified `Mount.mountpoint` path
+/// - Add a systemd mount to `/etc/fstab`
+/// - Optionally set systemd mount to start at boot iff `Mount.persist` is `true`.
+pub async fn add_fstab_entry(mount: Mount) -> Result<(), ImlAgentError> {
+ // This should return Ok(()) if the dir already exists.
+ fs::create_dir_all(&mount.mountpoint).await?;
+
+ update_fstab_entry(&mount.mountspec, &mount.mountpoint, mount.persist).await?;
+
+ Ok(())
+}
+
+/// This action will attempt to:
+/// - Remove a mountpoint from `/etc/fstab`
+pub async fn remove_fstab_entry(mount: Mount) -> Result<(), ImlAgentError> {
+ delete_fstab_entry(&mount.mountpoint).await?;
+
+ Ok(())
+}
+
 pub async fn unmount_many(xs: Vec<Unmount>) -> Result<(), ImlAgentError> {
  for x in xs {
  unmount(x).await?;