forked from DGNum/colmena
83 lines
2.8 KiB
Rust
83 lines
2.8 KiB
Rust
//! Static files required to evaluate a Hive configuation.
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//!
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//! We embed Nix expressions (eval.nix, options.nix, modules.nix) as well as
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//! as the auto-rollback script (auto-rollback.sh) into the resulting binary
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//! to ease distribution. The files are written to a temporary path when
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//! we need to use them.
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use std::fs::OpenOptions;
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use std::io::Write;
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use std::os::unix::fs::OpenOptionsExt;
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use tempfile::TempDir;
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use super::HivePath;
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const EVAL_NIX: &[u8] = include_bytes!("eval.nix");
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const OPTIONS_NIX: &[u8] = include_bytes!("options.nix");
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const MODULES_NIX: &[u8] = include_bytes!("modules.nix");
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/// Static files required to evaluate a Hive configuration.
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#[derive(Debug)]
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pub(super) struct Assets {
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/// Temporary directory holding the files.
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temp_dir: TempDir,
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}
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impl Assets {
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pub fn new() -> Self {
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let temp_dir = TempDir::new().unwrap();
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create_file(&temp_dir, "eval.nix", false, EVAL_NIX);
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create_file(&temp_dir, "options.nix", false, OPTIONS_NIX);
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create_file(&temp_dir, "modules.nix", false, MODULES_NIX);
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Self { temp_dir }
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}
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/// Returns the base expression from which the evaluated Hive can be used.
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pub fn get_base_expression(&self, hive_path: &HivePath) -> String {
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match hive_path {
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HivePath::Legacy(path) => {
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format!(
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"with builtins; let eval = import {eval_nix}; hive = eval {{ rawHive = import {path}; colmenaOptions = import {options_nix}; colmenaModules = import {modules_nix}; }}; in ",
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path = path.to_str().unwrap(),
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eval_nix = self.get_path("eval.nix"),
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options_nix = self.get_path("options.nix"),
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modules_nix = self.get_path("modules.nix"),
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)
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}
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HivePath::Flake(flake) => {
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format!(
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"with builtins; let eval = import {eval_nix}; hive = eval {{ flakeUri = \"{flake_uri}\"; colmenaOptions = import {options_nix}; colmenaModules = import {modules_nix}; }}; in ",
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flake_uri = flake.uri(),
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eval_nix = self.get_path("eval.nix"),
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options_nix = self.get_path("options.nix"),
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modules_nix = self.get_path("modules.nix"),
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)
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}
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}
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}
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fn get_path(&self, name: &str) -> String {
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self.temp_dir
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.path()
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.join(name)
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.to_str()
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.unwrap()
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.to_string()
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}
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}
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fn create_file(base: &TempDir, name: &str, executable: bool, contents: &[u8]) {
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let mode = if executable { 0o700 } else { 0o600 };
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let path = base.path().join(name);
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let mut f = OpenOptions::new()
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.create_new(true)
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.write(true)
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.mode(mode)
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.open(path)
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.unwrap();
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f.write_all(contents).unwrap();
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}
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