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To: Proxmox Backup Server development discussion
<pbs-devel@lists.proxmox.com>, Hannes Laimer <h.laimer@proxmox.com>
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Subject: Re: [pbs-devel] [PATCH proxmox-backup v3 12/24] add auto-mounting
for removable datastores
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comments inline
On 4/9/24 13:00, Hannes Laimer wrote:
> Signed-off-by: Hannes Laimer <h.laimer@proxmox.com>
> ---
> debian/proxmox-backup-server.install | 1 +
> debian/proxmox-backup-server.udev | 3 ++
> etc/Makefile | 3 +-
> etc/removable-device-attach@.service.in | 8 +++
> src/bin/proxmox_backup_manager/datastore.rs | 55 +++++++++++++++++++++
> 5 files changed, 69 insertions(+), 1 deletion(-)
> create mode 100644 etc/removable-device-attach@.service.in
>
> diff --git a/debian/proxmox-backup-server.install b/debian/proxmox-backup-server.install
> index ee114ea3..cda01069 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@.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 afdfb2bc..e21b8bc7 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 42f639f6..730de4f8 100644
> --- a/etc/Makefile
> +++ b/etc/Makefile
> @@ -7,7 +7,8 @@ DYNAMIC_UNITS := \
> proxmox-backup-banner.service \
> proxmox-backup-daily-update.service \
> proxmox-backup.service \
> - proxmox-backup-proxy.service
> + proxmox-backup-proxy.service \
> + removable-device-attach@.service
>
> all: $(UNITS) $(DYNAMIC_UNITS) pbs-enterprise.list
>
> diff --git a/etc/removable-device-attach@.service.in b/etc/removable-device-attach@.service.in
> new file mode 100644
> index 00000000..fe256548
> --- /dev/null
> +++ b/etc/removable-device-attach@.service.in
> @@ -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 --uuid %i
> \ No newline at end of file
> diff --git a/src/bin/proxmox_backup_manager/datastore.rs b/src/bin/proxmox_backup_manager/datastore.rs
> index f8462459..319d5eb0 100644
> --- a/src/bin/proxmox_backup_manager/datastore.rs
> +++ b/src/bin/proxmox_backup_manager/datastore.rs
> @@ -195,6 +195,60 @@ async fn delete_datastore(mut param: Value, rpcenv: &mut dyn RpcEnvironment) ->
> 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(mut param: Value, rpcenv: &mut dyn RpcEnvironment) -> Result<Value, Error> {
> + let output_format = extract_output_format(&mut param);
> + let uuid = param["uuid"]
> + .as_str()
> + .ok_or_else(|| format_err!("uuid has to be specified"))?;
> +
> + let info = &api2::config::datastore::API_METHOD_LIST_DATASTORES;
> + let data: Value = match info.handler {
> + ApiHandler::Sync(handler) => (handler)(serde_json::json!({}), info, rpcenv)?,
> + _ => unreachable!(),
> + };
> +
> + let store_name = data.as_array().and_then(|list| {
> + list.iter()
> + .filter_map(Value::as_object)
> + .find(|store| store.get("backing-device").map_or(false, |d| d.eq(&uuid)))
> + .and_then(|s| s.get("name").and_then(Value::as_str))
> + });
> +
> + if let Some(store_name) = store_name {
> + let client = connect_to_localhost()?;
> + let result = client
> + .post(
> + &format!("api2/json/admin/datastore/{}/mount", store_name),
> + None,
> + )
> + .await?;
Did not test this, but could this also be done by creating a new `param`
instance containing the `store` and `node` and call it via the code below?
```
let info = &api2::admin::datastore::API_METHOD_MOUNT;
let result = match info.handler {
ApiHandler::Sync(handler) => (handler)(param, info, rpcenv)?,
_ => unreachable!(),
};
```
> +
> + view_task_result(&client, result, &output_format).await?;
> + Ok(Value::Null)
> + } else {
> + Err(format_err!(
> + "'{}' is not associated with any datastore",
> + &uuid
> + ))
use bail and inline uuid, removing unneeded reference
> + }
> +}
> +
> pub fn datastore_commands() -> CommandLineInterface {
> let cmd_def = CliCommandMap::new()
> .insert("list", CliCommand::new(&API_METHOD_LIST_DATASTORES))
> @@ -240,6 +294,7 @@ pub fn datastore_commands() -> CommandLineInterface {
> pbs_config::datastore::complete_calendar_event,
> ),
> )
> + .insert("uuid-mount", CliCommand::new(&API_METHOD_UUID_MOUNT))
> .insert(
> "remove",
> CliCommand::new(&API_METHOD_DELETE_DATASTORE)