podup 0.4.0

Translate and run docker-compose files on rootless Podman
Documentation 
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use podup::{parse_file, parse_str};
use std::io::Write;

#[test]
fn extends_same_file() {
	let yaml = r#"
services:
  base:
    image: alpine
    environment:
      LOG: info
  app:
    extends: base
"#;
	let file = parse_str(yaml).unwrap();
	assert_eq!(file.services["app"].image.as_deref(), Some("alpine"));
}

#[test]
fn extends_merges_environment() {
	let yaml = r#"
services:
  base:
    image: alpine
    environment:
      LOG: info
      KEEP: yes
  app:
    extends:
      service: base
    environment:
      LOG: debug
      EXTRA: ok
"#;
	let file = parse_str(yaml).unwrap();
	let env = file.services["app"].environment.to_map();
	// Override wins for LOG, base value preserved for KEEP, override-only EXTRA present.
	assert_eq!(
		env.get("LOG").and_then(|v| v.clone()).as_deref(),
		Some("debug")
	);
	assert_eq!(
		env.get("KEEP").and_then(|v| v.clone()).as_deref(),
		Some("yes")
	);
	assert_eq!(
		env.get("EXTRA").and_then(|v| v.clone()).as_deref(),
		Some("ok")
	);
}

#[test]
fn extends_override_image_wins() {
	let yaml = r#"
services:
  base:
    image: alpine
  app:
    extends: base
    image: nginx:alpine
"#;
	let file = parse_str(yaml).unwrap();
	assert_eq!(file.services["app"].image.as_deref(), Some("nginx:alpine"));
}

#[test]
fn extends_chains_through_multiple_levels() {
	let yaml = r#"
services:
  grand:
    image: alpine
    environment:
      A: 1
  parent:
    extends: grand
    environment:
      B: 2
  child:
    extends: parent
    environment:
      C: 3
"#;
	let file = parse_str(yaml).unwrap();
	let env = file.services["child"].environment.to_map();
	assert!(env.contains_key("A"));
	assert!(env.contains_key("B"));
	assert!(env.contains_key("C"));
	assert_eq!(file.services["child"].image.as_deref(), Some("alpine"));
}

#[test]
fn extends_circular_errors() {
	let yaml = r#"
services:
  a:
    image: alpine
    extends: b
  b:
    image: alpine
    extends: a
"#;
	assert!(parse_str(yaml).is_err());
}

#[test]
fn extends_self_errors() {
	let yaml = r#"
services:
  a:
    image: alpine
    extends: a
"#;
	assert!(parse_str(yaml).is_err());
}

#[test]
fn extends_unknown_service_errors() {
	let yaml = r#"
services:
  a:
    image: alpine
    extends: missing
"#;
	assert!(parse_str(yaml).is_err());
}

#[test]
fn extends_with_external_file() {
	let dir = tempfile::tempdir().unwrap();
	let common_path = dir.path().join("common.yml");
	let mut f = std::fs::File::create(&common_path).unwrap();
	writeln!(
		f,
		r#"
services:
  base:
    image: alpine
    environment:
      FROM_BASE: yes
"#
	)
	.unwrap();

	let main_path = dir.path().join("docker-compose.yml");
	let mut m = std::fs::File::create(&main_path).unwrap();
	writeln!(
		m,
		r#"
services:
  app:
    extends:
      service: base
      file: ./common.yml
    environment:
      FROM_APP: yes
"#
	)
	.unwrap();

	let file = parse_file(&main_path).unwrap();
	assert_eq!(file.services["app"].image.as_deref(), Some("alpine"));
	let env = file.services["app"].environment.to_map();
	assert!(env.contains_key("FROM_BASE"));
	assert!(env.contains_key("FROM_APP"));
}