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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
package main
import (
"crypto/sha256"
"fmt"
"os"
"runtime"
"testing"
)
// setupTmpdir sets up a known golden layout, covering all allowed file/folder types in a nar
func setupTmpdir(t *testing.T) string {
tmpdir := t.TempDir()
pwd, _ := os.Getwd()
os.Chdir(tmpdir)
defer os.Chdir(pwd)
os.MkdirAll("sub/dir", 0755)
os.Symlink("brokenfile", "brokenlink")
os.Symlink("sub/dir", "dirl")
os.Symlink("/abs/nonexistentdir", "dirb")
os.Create("sub/dir/file1")
f, _ := os.Create("file2m")
_ = f.Truncate(2 * 1024 * 1024)
f.Close()
os.Symlink("../file2m", "sub/goodlink")
return tmpdir
}
func TestWriteNar(t *testing.T) {
if runtime.GOOS == "windows" {
// Skip test on Windows as the Nix package manager is not supported on this platform
t.Skip("nix package manager is not available on Windows")
}
dir := setupTmpdir(t)
t.Run("nar", func(t *testing.T) {
// obtained via `nix-store --dump /tmp/... | sha256sum` of the above test dir
expected := "727613a36f41030e93a4abf2649c3ec64a2757ccff364e3f6f7d544eb976e442"
h := sha256.New()
os.Chdir(dir)
err := writeNAR(h, os.DirFS("."))
if err != nil {
t.Fatal(err)
}
hash := fmt.Sprintf("%x", h.Sum(nil))
if expected != hash {
t.Fatal("sha256sum of nar not matched", hash, expected)
}
})
}
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