tape support: add drive configuration

src/api2/types/mod.rs

@@ -20,6 +20,10 @@ pub use userid::Userid;
 pub use userid::Authid;
 pub use userid::{PROXMOX_TOKEN_ID_SCHEMA, PROXMOX_TOKEN_NAME_SCHEMA, PROXMOX_GROUP_ID_SCHEMA};
 
+mod tape;
+pub use tape::*;
+
+
 // File names: may not contain slashes, may not start with "."
 pub const FILENAME_FORMAT: ApiStringFormat = ApiStringFormat::VerifyFn(|name| {
     if name.starts_with('.') {

src/config.rs

@@ -24,6 +24,7 @@ pub mod sync;
 pub mod token_shadow;
 pub mod user;
 pub mod verify;
+pub mod drive;
 
 /// Check configuration directory permissions
 ///

src/config/drive.rs

@@ -0,0 +1,145 @@
+use std::collections::HashMap;
+
+use anyhow::{bail, Error};
+use lazy_static::lazy_static;
+
+use proxmox::{
+    api::{
+        schema::*,
+        section_config::{
+            SectionConfig,
+            SectionConfigData,
+            SectionConfigPlugin,
+        },
+    },
+    tools::fs::{
+        open_file_locked,
+        replace_file,
+        CreateOptions,
+    },
+};
+
+use crate::{
+    api2::types::{
+        DRIVE_ID_SCHEMA,
+        VirtualTapeDrive,
+        LinuxTapeDrive,
+        ScsiTapeChanger,
+    },
+};
+
+lazy_static! {
+    pub static ref CONFIG: SectionConfig = init();
+}
+
+
+fn init() -> SectionConfig {
+    let mut config = SectionConfig::new(&DRIVE_ID_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 LinuxTapeDrive::API_SCHEMA {
+        Schema::Object(ref obj_schema) => obj_schema,
+        _ => unreachable!(),
+    };
+    let plugin = SectionConfigPlugin::new("linux".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
+}
+
+pub const DRIVE_CFG_FILENAME: &str = "/etc/proxmox-backup/tape.cfg";
+pub const DRIVE_CFG_LOCKFILE: &str = "/etc/proxmox-backup/.tape.lck";
+
+pub fn lock() -> Result<std::fs::File, Error> {
+    open_file_locked(DRIVE_CFG_LOCKFILE, std::time::Duration::new(10, 0), true)
+}
+
+pub fn config() -> Result<(SectionConfigData, [u8;32]), Error> {
+
+    let content = proxmox::tools::fs::file_read_optional_string(DRIVE_CFG_FILENAME)?;
+    let content = content.unwrap_or(String::from(""));
+
+    let digest = openssl::sha::sha256(content.as_bytes());
+    let data = CONFIG.parse(DRIVE_CFG_FILENAME, &content)?;
+    Ok((data, digest))
+}
+
+pub fn save_config(config: &SectionConfigData) -> Result<(), Error> {
+    let raw = CONFIG.write(DRIVE_CFG_FILENAME, &config)?;
+
+    let backup_user = crate::backup::backup_user()?;
+    let mode = nix::sys::stat::Mode::from_bits_truncate(0o0640);
+    // set the correct owner/group/permissions while saving file
+    // owner(rw) = root, group(r)= backup
+    let options = CreateOptions::new()
+        .perm(mode)
+        .owner(nix::unistd::ROOT)
+        .group(backup_user.gid);
+
+    replace_file(DRIVE_CFG_FILENAME, raw.as_bytes(), options)?;
+
+    Ok(())
+}
+
+pub fn check_drive_exists(config: &SectionConfigData, drive: &str) -> Result<(), Error> {
+    match config.sections.get(drive) {
+        Some((section_type, _)) => {
+            if !(section_type == "linux" || 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 Linux tape drives
+pub fn complete_linux_drive_name(_arg: &str, _param: &HashMap<String, String>) -> Vec<String> {
+    match config() {
+        Ok((data, _digest)) => data.sections.iter()
+            .filter(|(_id, (section_type, _))| {
+                section_type == "linux"
+            })
+            .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![],
+    }
+}