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