From 4606f34353aa7ef1d55dbbe4ec8111b8c25f8d07 Mon Sep 17 00:00:00 2001
From: Dietmar Maurer <dietmar@proxmox.com>
Date: Thu, 10 Dec 2020 13:20:39 +0100
Subject: [PATCH] tape: implement read-label command

---
 src/api2/tape/drive.rs     | 49 +++++++++++++++++++++++++++++++++++++
 src/api2/types/tape/mod.rs |  3 +++
 src/bin/proxmox-tape.rs    | 50 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 102 insertions(+)

diff --git a/src/api2/tape/drive.rs b/src/api2/tape/drive.rs
index 6b398117..cb360364 100644
--- a/src/api2/tape/drive.rs
+++ b/src/api2/tape/drive.rs
@@ -24,6 +24,7 @@ use crate::{
         LinuxTapeDrive,
         ScsiTapeChanger,
         TapeDeviceInfo,
+        MediaLabelInfoFlat,
     },
     tape::{
         TAPE_STATUS_DIR,
@@ -358,6 +359,54 @@ fn write_media_label(
     Ok(())
 }
 
+#[api(
+    input: {
+        properties: {
+            drive: {
+                schema: DRIVE_ID_SCHEMA,
+            },
+        },
+    },
+    returns: {
+        type: MediaLabelInfoFlat,
+    },
+)]
+/// Read media label
+pub fn read_label(drive: String) -> Result<MediaLabelInfoFlat, Error> {
+
+    let (config, _digest) = config::drive::config()?;
+
+    let mut drive = open_drive(&config, &drive)?;
+
+    let info = drive.read_label()?;
+
+    let info = match info {
+        Some(info) => {
+            let mut flat = MediaLabelInfoFlat {
+                uuid: info.label.uuid.to_string(),
+                changer_id: info.label.changer_id.clone(),
+                ctime: info.label.ctime,
+                media_set_ctime: None,
+                media_set_uuid: None,
+                pool: None,
+                seq_nr: None,
+            };
+            if let Some((set, _)) = info.media_set_label {
+                flat.pool = Some(set.pool.clone());
+                flat.seq_nr = Some(set.seq_nr);
+                flat.media_set_uuid = Some(set.uuid.to_string());
+                flat.media_set_ctime = Some(set.ctime);
+            }
+            flat
+        }
+        None => {
+            bail!("Media is empty (no label).");
+        }
+    };
+
+    Ok(info)
+}
+
 #[sortable]
 pub const SUBDIRS: SubdirMap = &sorted!([
     (
diff --git a/src/api2/types/tape/mod.rs b/src/api2/types/tape/mod.rs
index 6c3b8770..58abecc6 100644
--- a/src/api2/types/tape/mod.rs
+++ b/src/api2/types/tape/mod.rs
@@ -11,3 +11,6 @@ pub use media_pool::*;
 
 mod media_status;
 pub use media_status::*;
+
+mod media;
+pub use media::*;
diff --git a/src/bin/proxmox-tape.rs b/src/bin/proxmox-tape.rs
index a16b06ac..a038680a 100644
--- a/src/bin/proxmox-tape.rs
+++ b/src/bin/proxmox-tape.rs
@@ -12,6 +12,7 @@ use proxmox::{
 };
 
 use proxmox_backup::{
+    tools::format::render_epoch,
     api2::{
         self,
         types::{
@@ -229,6 +230,50 @@ fn label_media(
     Ok(())
 }
 
+#[api(
+    input: {
+        properties: {
+            drive: {
+                schema: DRIVE_ID_SCHEMA,
+                optional: true,
+            },
+             "output-format": {
+                schema: OUTPUT_FORMAT,
+                optional: true,
+             },
+        },
+    },
+)]
+/// Read media label
+fn read_label(
+    mut param: Value,
+    rpcenv: &mut dyn RpcEnvironment,
+) -> Result<(), Error> {
+   let (config, _digest) = config::drive::config()?;
+
+    param["drive"] = lookup_drive_name(&param, &config)?.into();
+
+    let output_format = get_output_format(&param);
+    let info = &api2::tape::drive::API_METHOD_READ_LABEL;
+    let mut data = match info.handler {
+        ApiHandler::Sync(handler) => (handler)(param, info, rpcenv)?,
+        _ => unreachable!(),
+    };
+
+    let options = default_table_format_options()
+        .column(ColumnConfig::new("changer-id"))
+        .column(ColumnConfig::new("uuid"))
+        .column(ColumnConfig::new("ctime").renderer(render_epoch))
+        .column(ColumnConfig::new("pool"))
+        .column(ColumnConfig::new("media-set-uuid"))
+        .column(ColumnConfig::new("media-set-ctime").renderer(render_epoch))
+        ;
+
+    format_and_print_result_full(&mut data, info.returns, &output_format, &options);
+
+    Ok(())
+
+}
 fn main() {
 
     let cmd_def = CliCommandMap::new()
@@ -247,6 +292,11 @@ fn main() {
             CliCommand::new(&API_METHOD_EJECT_MEDIA)
                 .completion_cb("drive", complete_drive_name)
         )
+        .insert(
+            "read-label",
+            CliCommand::new(&API_METHOD_READ_LABEL)
+                .completion_cb("drive", complete_drive_name)
+        )
         .insert(
             "label",
             CliCommand::new(&API_METHOD_LABEL_MEDIA)