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use std::default::Default;
use std::fs::write;
use std::path::Path;
use std::process::Command;
use tempfile::tempdir;
#[derive(Debug, thiserror::Error)]
pub enum CloudInitError {
#[error("failed to create ISO image with genisoimage: {0}")]
IsoFailed(String),
#[error(transparent)]
IoError(#[from] std::io::Error),
#[error(transparent)]
StringError(#[from] std::string::FromUtf8Error),
}
#[derive(Default, Debug, Clone)]
pub struct CloudInitConfig {
hostname: String,
authorized_keys: String,
}
impl CloudInitConfig {
pub fn hostname(&self) -> &str {
&self.hostname
}
pub fn set_hostname(&mut self, hostname: &str) {
self.hostname = hostname.to_string();
}
pub fn authorized_keys(&self) -> &str {
&self.authorized_keys
}
pub fn set_authorized_keys(&mut self, keys: &str) {
self.authorized_keys = keys.to_string();
}
fn write(&self, dir: &Path) -> std::io::Result<()> {
let metadata = dir.join("meta-data");
let userdata = dir.join("user-data");
write(
&metadata,
format!(
"# Amazon EC2 style metadata\nlocal-hostname: {}\n",
self.hostname()
),
)?;
write(
&userdata,
format!(
"#cloud-config\nssh_authorized_keys:\n- {}",
self.authorized_keys()
),
)?;
Ok(())
}
pub fn create_iso(&self, filename: &Path) -> Result<(), CloudInitError> {
let dir = tempdir()?;
self.write(dir.path())?;
let r = Command::new("genisoimage")
.arg("-quiet")
.arg("-volid")
.arg("cidata")
.arg("-joliet")
.arg("-rock")
.arg("-output")
.arg(filename)
.arg(dir.path())
.output()?;
if !r.status.success() {
let stderr = String::from_utf8(r.stderr)?;
return Err(CloudInitError::IsoFailed(stderr));
}
Ok(())
}
}
#[cfg(test)]
mod test {
use super::CloudInitConfig;
#[test]
fn is_empty_by_default() {
let init = CloudInitConfig::default();
assert_eq!(init.hostname(), "");
assert_eq!(init.authorized_keys(), "");
}
#[test]
fn sets_hostname() {
let mut init = CloudInitConfig::default();
init.set_hostname("foo");
assert_eq!(init.hostname(), "foo");
}
#[test]
fn sets_authorized_keys() {
let mut init = CloudInitConfig::default();
init.set_authorized_keys("auth");
assert_eq!(init.authorized_keys(), "auth");
}
}
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