move drive config to pbs_config workspace

Also moved the tape type definitions to pbs_api_types.

pbs-config/src/drive.rs

@@ -0,0 +1,146 @@
+//! Tape drive/changer configuration
+//!
+//! This configuration module is based on [`SectionConfig`], and
+//! provides a type safe interface to store [`LtoTapeDrive`],
+//! [`VirtualTapeDrive`] and [`ScsiTapeChanger`] configurations.
+//!
+//! Drive type [`VirtualTapeDrive`] is only useful for debugging.
+//!
+//! [LtoTapeDrive]: crate::api2::types::LtoTapeDrive
+//! [VirtualTapeDrive]: crate::api2::types::VirtualTapeDrive
+//! [ScsiTapeChanger]: crate::api2::types::ScsiTapeChanger
+//! [SectionConfig]: proxmox::api::section_config::SectionConfig
+
+use std::collections::HashMap;
+
+use anyhow::{bail, Error};
+use lazy_static::lazy_static;
+
+use proxmox::{
+    api::{
+        schema::*,
+        section_config::{
+            SectionConfig,
+            SectionConfigData,
+            SectionConfigPlugin,
+        },
+    },
+};
+
+use crate::{open_backup_lockfile, replace_backup_config, BackupLockGuard};
+
+use pbs_api_types::{
+    DRIVE_NAME_SCHEMA, VirtualTapeDrive, LtoTapeDrive, ScsiTapeChanger,
+};
+
+
+lazy_static! {
+    /// Static [`SectionConfig`] to access parser/writer functions.
+    pub static ref CONFIG: SectionConfig = init();
+}
+
+
+fn init() -> SectionConfig {
+    let mut config = SectionConfig::new(&DRIVE_NAME_SCHEMA);
+
+    let obj_schema = match VirtualTapeDrive::API_SCHEMA {
+        Schema::Object(ref obj_schema) => obj_schema,
+        _ => unreachable!(),
+    };
+    let plugin = SectionConfigPlugin::new("virtual".to_string(), Some("name".to_string()), obj_schema);
+    config.register_plugin(plugin);
+
+    let obj_schema = match LtoTapeDrive::API_SCHEMA {
+        Schema::Object(ref obj_schema) => obj_schema,
+        _ => unreachable!(),
+    };
+    let plugin = SectionConfigPlugin::new("lto".to_string(), Some("name".to_string()), obj_schema);
+    config.register_plugin(plugin);
+
+    let obj_schema = match ScsiTapeChanger::API_SCHEMA {
+        Schema::Object(ref obj_schema) => obj_schema,
+        _ => unreachable!(),
+    };
+    let plugin = SectionConfigPlugin::new("changer".to_string(), Some("name".to_string()), obj_schema);
+    config.register_plugin(plugin);
+    config
+}
+
+/// Configuration file name
+pub const DRIVE_CFG_FILENAME: &str = "/etc/proxmox-backup/tape.cfg";
+/// Lock file name (used to prevent concurrent access)
+pub const DRIVE_CFG_LOCKFILE: &str = "/etc/proxmox-backup/.tape.lck";
+
+/// Get exclusive lock
+pub fn lock() -> Result<BackupLockGuard, Error> {
+    open_backup_lockfile(DRIVE_CFG_LOCKFILE, None, true)
+}
+
+/// Read and parse the configuration file
+pub fn config() -> Result<(SectionConfigData, [u8;32]), Error> {
+
+    let content = proxmox::tools::fs::file_read_optional_string(DRIVE_CFG_FILENAME)?
+        .unwrap_or_else(|| "".to_string());
+
+    let digest = openssl::sha::sha256(content.as_bytes());
+    let data = CONFIG.parse(DRIVE_CFG_FILENAME, &content)?;
+    Ok((data, digest))
+}
+
+/// Save the configuration file
+pub fn save_config(config: &SectionConfigData) -> Result<(), Error> {
+    let raw = CONFIG.write(DRIVE_CFG_FILENAME, &config)?;
+    replace_backup_config(DRIVE_CFG_FILENAME, raw.as_bytes())
+}
+
+/// Check if the specified drive name exists in the config.
+pub fn check_drive_exists(config: &SectionConfigData, drive: &str) -> Result<(), Error> {
+    match config.sections.get(drive) {
+        Some((section_type, _)) => {
+            if !(section_type == "lto" || section_type == "virtual") {
+                bail!("Entry '{}' exists, but is not a tape drive", drive);
+            }
+        }
+        None => bail!("Drive '{}' does not exist", drive),
+    }
+    Ok(())
+}
+
+
+// shell completion helper
+
+/// List all drive names
+pub fn complete_drive_name(_arg: &str, _param: &HashMap<String, String>) -> Vec<String> {
+    match config() {
+        Ok((data, _digest)) => data.sections.iter()
+            .map(|(id, _)| id.to_string())
+            .collect(),
+        Err(_) => return vec![],
+    }
+}
+
+/// List Lto tape drives
+pub fn complete_lto_drive_name(_arg: &str, _param: &HashMap<String, String>) -> Vec<String> {
+    match config() {
+        Ok((data, _digest)) => data.sections.iter()
+            .filter(|(_id, (section_type, _))| {
+                section_type == "lto"
+            })
+            .map(|(id, _)| id.to_string())
+            .collect(),
+        Err(_) => return vec![],
+    }
+}
+
+/// List Scsi tape changer names
+pub fn complete_changer_name(_arg: &str, _param: &HashMap<String, String>) -> Vec<String> {
+    match config() {
+        Ok((data, _digest)) => data.sections.iter()
+            .filter(|(_id, (section_type, _))| {
+                section_type == "changer"
+            })
+            .map(|(id, _)| id.to_string())
+            .collect(),
+        Err(_) => return vec![],
+    }
+}

pbs-config/src/lib.rs

@@ -1,4 +1,5 @@
 pub mod domains;
+pub mod drive;
 pub mod remote;
 
 use anyhow::{format_err, Error};