[pbs-devel] [PATCH proxmox-backup v14 10/25] add auto-mounting for removable datastores

[Fabian Grünbichler]

On November 22, 2024 3:46 pm, Hannes Laimer wrote:
> If a device houses multiple datastore, none of them will be mounted
> automatically. If a device only contains a single datastore it will be
> mounted automatically. The reason for not mounting multiple datastore
> automatically is that we don't know which is actually wanted, and since
> mounting all means also all have to be unmounted manually, it made sense
> to have the user choose which to mount.
> 
> Signed-off-by: Hannes Laimer <h.laimer at proxmox.com>
> ---
> changes since v13:
>  * skip API alltogether and use mounting wrapper directly
>  * load datastore config directly
> 
>  debian/proxmox-backup-server.install        |  1 +
>  debian/proxmox-backup-server.udev           |  3 ++
>  etc/Makefile                                |  1 +
>  etc/removable-device-attach at .service        |  8 ++++
>  src/bin/proxmox_backup_manager/datastore.rs | 53 ++++++++++++++++++++-
>  5 files changed, 65 insertions(+), 1 deletion(-)
>  create mode 100644 etc/removable-device-attach at .service
> 
> diff --git a/debian/proxmox-backup-server.install b/debian/proxmox-backup-server.install
> index 79757eadb..ff581e3dd 100644
> --- a/debian/proxmox-backup-server.install
> +++ b/debian/proxmox-backup-server.install
> @@ -4,6 +4,7 @@ etc/proxmox-backup-daily-update.service /lib/systemd/system/
>  etc/proxmox-backup-daily-update.timer /lib/systemd/system/
>  etc/proxmox-backup-proxy.service /lib/systemd/system/
>  etc/proxmox-backup.service /lib/systemd/system/
> +etc/removable-device-attach at .service /lib/systemd/system/
>  usr/bin/pmt
>  usr/bin/pmtx
>  usr/bin/proxmox-tape
> diff --git a/debian/proxmox-backup-server.udev b/debian/proxmox-backup-server.udev
> index afdfb2bc7..e21b8bc71 100644
> --- a/debian/proxmox-backup-server.udev
> +++ b/debian/proxmox-backup-server.udev
> @@ -16,3 +16,6 @@ SUBSYSTEM=="scsi_generic", SUBSYSTEMS=="scsi", ATTRS{type}=="1", ENV{ID_SCSI_SER
>    SYMLINK+="tape/by-id/scsi-$env{ID_SCSI_SERIAL}-sg"
>  
>  LABEL="persistent_storage_tape_end"
> +
> +# triggers the mounting of a removable device
> +ACTION=="add", SUBSYSTEM=="block", ENV{ID_FS_UUID}!="", TAG+="systemd", ENV{SYSTEMD_WANTS}="removable-device-attach@$env{ID_FS_UUID}"
> \ No newline at end of file
> diff --git a/etc/Makefile b/etc/Makefile
> index 42f639f62..26e91684e 100644
> --- a/etc/Makefile
> +++ b/etc/Makefile
> @@ -2,6 +2,7 @@ include ../defines.mk
>  
>  UNITS := \
>  	proxmox-backup-daily-update.timer \
> +	removable-device-attach at .service
>  
>  DYNAMIC_UNITS := \
>  	proxmox-backup-banner.service \
> diff --git a/etc/removable-device-attach at .service b/etc/removable-device-attach at .service
> new file mode 100644
> index 000000000..e10d1ea3c
> --- /dev/null
> +++ b/etc/removable-device-attach at .service
> @@ -0,0 +1,8 @@
> +[Unit]
> +Description=Try to mount the removable device of a datastore with uuid '%i'.
> +After=proxmox-backup-proxy.service
> +Requires=proxmox-backup-proxy.service
> +
> +[Service]
> +Type=simple
> +ExecStart=/usr/sbin/proxmox-backup-manager datastore uuid-mount %i
> diff --git a/src/bin/proxmox_backup_manager/datastore.rs b/src/bin/proxmox_backup_manager/datastore.rs
> index 32a55fb9c..bcfdae786 100644
> --- a/src/bin/proxmox_backup_manager/datastore.rs
> +++ b/src/bin/proxmox_backup_manager/datastore.rs
> @@ -9,7 +9,7 @@ use proxmox_backup::api2;
>  use proxmox_backup::api2::config::datastore::DeletableProperty;
>  use proxmox_backup::client_helpers::connect_to_localhost;
>  
> -use anyhow::Error;
> +use anyhow::{format_err, Error};
>  use serde_json::Value;
>  
>  #[api(
> @@ -244,6 +244,53 @@ async fn update_datastore(name: String, mut param: Value) -> Result<(), Error> {
>      Ok(())
>  }
>  
> +#[api(
> +    protected: true,
> +    input: {
> +        properties: {
> +            uuid: {
> +                type: String,
> +                description: "The UUID of the device that should be mounted",
> +            },
> +            "output-format": {
> +                schema: OUTPUT_FORMAT,
> +                optional: true,
> +            },
> +        },
> +    },
> +)]
> +/// Try mounting a removable datastore given the UUID.
> +async fn uuid_mount(param: Value, _rpcenv: &mut dyn RpcEnvironment) -> Result<Value, Error> {
> +    let uuid = param["uuid"]
> +        .as_str()
> +        .ok_or_else(|| format_err!("uuid has to be specified"))?;
> +
> +    let (config, _digest) = pbs_config::datastore::config()?;
> +    let list: Vec<DataStoreConfig> = config.convert_to_typed_array("datastore")?;
> +    let matching_stores: Vec<DataStoreConfig> = list
> +        .into_iter()
> +        .filter(|store: &DataStoreConfig| {
> +            store
> +                .backing_device
> +                .clone()
> +                .map_or(false, |device| device.eq(&uuid))
> +        })
> +        .collect();
> +
> +    if matching_stores.len() != 1 {
> +        return Ok(Value::Null);
> +    }
> +
> +    if let Some(store) = matching_stores.get(0) {
> +        api2::admin::datastore::do_mount_device(store.clone())?;
> +        return Ok(Value::Null);

this return is redundant ;)

> +    }
> +
> +    // we don't want to fail for UUIDs that are not associated with datastores, as that produces
> +    // quite some noise in the logs, given this is check for every device that is plugged in.
> +    Ok(Value::Null)
> +}
> +
>  pub fn datastore_commands() -> CommandLineInterface {
>      let cmd_def = CliCommandMap::new()
>          .insert("list", CliCommand::new(&API_METHOD_LIST_DATASTORES))
> @@ -289,6 +336,10 @@ pub fn datastore_commands() -> CommandLineInterface {
>                      pbs_config::datastore::complete_calendar_event,
>                  ),
>          )
> +        .insert(
> +            "uuid-mount",
> +            CliCommand::new(&API_METHOD_UUID_MOUNT).arg_param(&["uuid"]),
> +        )
>          .insert(
>              "remove",
>              CliCommand::new(&API_METHOD_DELETE_DATASTORE)
> -- 
> 2.39.5
> 
> 
> 
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