blazehash 0.2.5

Forensic file hasher — hashdeep for the modern era, BLAKE3 by default
Documentation 
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use assert_cmd::Command;
use tempfile::TempDir;
use std::fs;

fn write_manifest_a(dir: &TempDir) -> std::path::PathBuf {
    let p = dir.path().join("a.hash");
    fs::write(&p, concat!(
        "## manifest: A\n",
        "sha256  aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa  shared.txt\n",
        "sha256  bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb  only_in_a.txt\n",
        "sha256  cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc  also_shared.pdf\n",
    )).unwrap();
    p
}

fn write_manifest_b(dir: &TempDir) -> std::path::PathBuf {
    let p = dir.path().join("b.hash");
    fs::write(&p, concat!(
        "## manifest: B\n",
        "sha256  dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd  shared.txt\n",
        "sha256  eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee  only_in_b.txt\n",
        "sha256  ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff  also_shared.pdf\n",
    )).unwrap();
    p
}

#[test]
fn test_intersect_finds_common_paths() {
    let dir = TempDir::new().unwrap();
    let a = write_manifest_a(&dir);
    let b = write_manifest_b(&dir);
    let out = Command::cargo_bin("blazehash").unwrap()
        .args(["intersect", a.to_str().unwrap(), b.to_str().unwrap()])
        .output().unwrap();
    assert!(out.status.success());
    let stdout = String::from_utf8_lossy(&out.stdout);
    assert!(stdout.contains("shared.txt"), "shared path must appear");
    assert!(stdout.contains("also_shared.pdf"), "second shared path must appear");
    assert!(!stdout.contains("only_in_a.txt"), "a-only path must not appear");
    assert!(!stdout.contains("only_in_b.txt"), "b-only path must never appear");
}

#[test]
fn test_intersect_uses_hash_from_first_manifest() {
    let dir = TempDir::new().unwrap();
    let a = write_manifest_a(&dir);
    let b = write_manifest_b(&dir);
    let out = Command::cargo_bin("blazehash").unwrap()
        .args(["intersect", a.to_str().unwrap(), b.to_str().unwrap()])
        .output().unwrap();
    assert!(out.status.success());
    let stdout = String::from_utf8_lossy(&out.stdout);
    assert!(stdout.contains("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"),
        "output must use hash from first manifest");
    assert!(!stdout.contains("dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd"),
        "hash from second manifest must not appear for shared.txt");
}

#[test]
fn test_intersect_no_common_paths_exits_nonzero() {
    let dir = TempDir::new().unwrap();
    let a = dir.path().join("a.hash");
    let b = dir.path().join("b.hash");
    fs::write(&a, "sha256  aaaa  file_a.txt\n").unwrap();
    fs::write(&b, "sha256  bbbb  file_b.txt\n").unwrap();
    let out = Command::cargo_bin("blazehash").unwrap()
        .args(["intersect", a.to_str().unwrap(), b.to_str().unwrap()])
        .output().unwrap();
    assert!(!out.status.success(), "empty intersection must exit nonzero");
}

#[test]
fn test_intersect_output_to_file() {
    let dir = TempDir::new().unwrap();
    let a = write_manifest_a(&dir);
    let b = write_manifest_b(&dir);
    let out_path = dir.path().join("common.hash");
    Command::cargo_bin("blazehash").unwrap()
        .args(["intersect", a.to_str().unwrap(), b.to_str().unwrap(),
               "-o", out_path.to_str().unwrap()])
        .assert().success();
    let content = fs::read_to_string(&out_path).unwrap();
    assert!(content.contains("shared.txt"));
}

#[test]
fn test_intersect_missing_second_arg_fails() {
    let dir = TempDir::new().unwrap();
    let a = dir.path().join("a.hash");
    fs::write(&a, "sha256  aaaa  f.txt\n").unwrap();
    Command::cargo_bin("blazehash").unwrap()
        .args(["intersect", a.to_str().unwrap()])
        .assert().failure();
}