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lifecycle: bind via EXTRA_NSPAWN_FLAGS in /etc/nixos-containers/<name>.conf

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müde 2026-05-14 22:06:27 +02:00
parent 326da5a7bf
commit 377eb994a1
1 changed files with 11 additions and 11 deletions
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22
hive-c0re/src/lifecycle.rs
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@ -37,23 +37,23 @@ pub async fn spawn(name: &str, agent_flake: &str, agent_dir: &Path) -> Result<()
validate(name)?;
let container = container_name(name);
run(&["create", &container, "--flake", agent_flake]).await?;
write_nspawn_override(&container, agent_dir)?;
append_bind_flag(&container, agent_dir)?;
run(&["start", &container]).await
}
/// `nixos-container` in this stack doesn't expose `--bind`, so we drop a
/// `.nspawn` override that systemd-nspawn picks up at start time.
fn write_nspawn_override(container: &str, agent_dir: &Path) -> Result<()> {
const NSPAWN_DIR: &str = "/run/systemd/nspawn";
std::fs::create_dir_all(NSPAWN_DIR)
.with_context(|| format!("create {NSPAWN_DIR}"))?;
let path = format!("{NSPAWN_DIR}/{container}.nspawn");
let content = format!(
"[Files]\nBind={}:{CONTAINER_RUNTIME_MOUNT}\n",
/// `nixos-container` doesn't expose `--bind` on the CLI, but its start script
/// expands `$EXTRA_NSPAWN_FLAGS` (from `/etc/nixos-containers/<name>.conf`)
/// unquoted into the `systemd-nspawn` invocation. Append a `--bind` flag there.
fn append_bind_flag(container: &str, agent_dir: &Path) -> Result<()> {
let path = format!("/etc/nixos-containers/{container}.conf");
let line = format!(
"\nEXTRA_NSPAWN_FLAGS=\"--bind={}:{CONTAINER_RUNTIME_MOUNT}\"\n",
agent_dir.display()
);
let mut content = std::fs::read_to_string(&path).with_context(|| format!("read {path}"))?;
content.push_str(&line);
std::fs::write(&path, content).with_context(|| format!("write {path}"))?;
tracing::info!(%path, "wrote nspawn bind override");
tracing::info!(%path, "appended EXTRA_NSPAWN_FLAGS for bind mount");
Ok(())
}