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//! Tool configuration.
use crate::util::{check_network_names, expand_optional_pathbuf, expand_optional_pathbufs};
use log::debug;
use serde::{Deserialize, Serialize};
use std::default::Default;
use std::fs;
use std::path::{Path, PathBuf};
/// Configuration from configuration file.
#[derive(Default, Debug, Deserialize, Serialize)]
#[serde(deny_unknown_fields)]
pub struct Configuration {
/// Base image, if provided.
pub default_base_image: Option<PathBuf>,
/// Default size of new VM image, in GiB.
pub default_image_gib: Option<u64>,
/// Default memory to give to new VM, in MiB.
pub default_memory_mib: Option<u64>,
/// Default number of CPUs for a new VM.
pub default_cpus: Option<u64>,
/// Should host certificates be generated for new VMs?
pub default_generate_host_certificate: Option<bool>,
/// Should new VM be started automatically on host boot?
pub default_autostart: Option<bool>,
/// List of default networks to add to hosts.
pub default_networks: Option<Vec<String>>,
/// Directory where new VM images should be created, if given.
pub image_directory: Option<PathBuf>,
/// List of path names of SSH public keys to put into the default
/// user's `authorized_keys` file.
pub authorized_keys: Option<Vec<PathBuf>>,
/// Path name to SSH CA key for creating SSH host certificates.
pub ca_key: Option<PathBuf>,
/// Path name to SSH CA public key for verifying SSH user certificates.
pub user_ca_pubkey: Option<PathBuf>,
/// Should SSH authorized keys files be allowed by default?
pub default_allow_authorized_keys: Option<bool>,
}
/// Errors from this module.
#[derive(Debug, thiserror::Error)]
pub enum ConfigurationError {
/// Network name error.
#[error(transparent)]
NetworkNameError(#[from] crate::util::NetworkNameError),
/// Error reading configuration file.
#[error("couldn't read configuration file {0}")]
ReadError(PathBuf, #[source] std::io::Error),
/// YAML parsing error.
#[error(transparent)]
YamlError(#[from] serde_yaml::Error),
/// Error expanding a ~user in a path name.
#[error(transparent)]
HomeDirError(#[from] home_dir::Error),
}
impl Configuration {
/// Read configuration from named file.
pub fn from_file(filename: &Path) -> Result<Self, ConfigurationError> {
if filename.exists() {
debug!("reading configuration file {}", filename.display());
let config = fs::read(filename)
.map_err(|err| ConfigurationError::ReadError(filename.to_path_buf(), err))?;
let mut config: Configuration = serde_yaml::from_slice(&config)?;
if let Some(ref networks) = config.default_networks {
check_network_names(networks)?;
}
config.expand_tildes()?;
config.fill_in_missing_networks();
debug!("config: {:#?}", config);
Ok(config)
} else {
Ok(Self::default())
}
}
fn fill_in_missing_networks(&mut self) {
if self.default_networks.is_none() {
self.default_networks = Some(vec!["network=default".to_string()]);
}
}
fn expand_tildes(&mut self) -> Result<(), home_dir::Error> {
expand_optional_pathbuf(&mut self.default_base_image)?;
expand_optional_pathbuf(&mut self.image_directory)?;
expand_optional_pathbuf(&mut self.image_directory)?;
expand_optional_pathbuf(&mut self.ca_key)?;
expand_optional_pathbuf(&mut self.user_ca_pubkey)?;
expand_optional_pathbufs(&mut self.authorized_keys)?;
Ok(())
}
}
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