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//! Tool configuration.
use log::debug;
use serde::Deserialize;
use std::default::Default;
use std::fs;
use std::path::{Path, PathBuf};
/// Configuration from configuration file.
#[derive(Default, Debug, Deserialize)]
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>,
/// 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>,
}
/// Errors from this module.
#[derive(Debug, thiserror::Error)]
pub enum ConfigurationError {
/// 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),
}
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 config: Configuration = serde_yaml::from_slice(&config)?;
debug!("config: {:#?}", config);
Ok(config)
} else {
Ok(Self::default())
}
}
}
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