From 38450db74abdddfb3e366516f46e0e9c291002b1 Mon Sep 17 00:00:00 2001
From: Ophestra <cat@gensokyo.uk>
Date: Sun, 7 Jun 2026 21:12:15 +0900
Subject: internal/rosa: access backing storage through fs

This is more versatile than hardcoding the os.Root implementation.

Signed-off-by: Ophestra <cat@gensokyo.uk>
---
 internal/rosa/mirror_test.go | 77 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 internal/rosa/mirror_test.go

(limited to 'internal/rosa/mirror_test.go')

diff --git a/internal/rosa/mirror_test.go b/internal/rosa/mirror_test.go
new file mode 100644
index 00000000..a671cd31
--- /dev/null
+++ b/internal/rosa/mirror_test.go
@@ -0,0 +1,77 @@
+package rosa_test
+
+import (
+	"crypto/ed25519"
+	"io/fs"
+	"log"
+	"net/http/httptest"
+	"os"
+	"testing"
+	"testing/fstest"
+	"unique"
+
+	"hakurei.app/check"
+	"hakurei.app/fhs"
+	"hakurei.app/internal/pkg"
+	"hakurei.app/internal/rosa"
+	"hakurei.app/message"
+)
+
+func TestMirror(t *testing.T) {
+	t.Parallel()
+
+	pub, priv, err := ed25519.GenerateKey(nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	base := check.MustAbs(t.TempDir())
+	msg := message.New(log.New(os.Stderr, "mirror: ", 0))
+	msg.SwapVerbose(testing.Verbose())
+
+	var c *pkg.Cache
+	c, err = pkg.Open(t.Context(), msg, 0, 0, 0, base)
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(c.Close)
+
+	a := pkg.NewExec(
+		"", "",
+		nil, 0, false, false,
+		fhs.AbsRoot, nil, fhs.AbsRoot, nil,
+	)
+	id := c.Ident(a)
+	ids := pkg.Encode(id.Value())
+
+	var wantChecksum pkg.Checksum
+	if err = pkg.SumFS(&wantChecksum, fstest.MapFS{
+		".": {Mode: os.ModeDir | 0500},
+	}, "."); err != nil {
+		t.Fatal(err)
+	}
+	wantChecksums := pkg.Encode(wantChecksum)
+
+	server := httptest.NewServer(rosa.NewMirror(msg, fstest.MapFS{
+		"identifier/" + ids:         {Mode: fs.ModeSymlink | 0777, Data: []byte("../checksum/" + wantChecksums)},
+		"checksum/" + wantChecksums: {Mode: os.ModeDir | 0500},
+	}, priv))
+	t.Cleanup(server.Close)
+
+	var extern pkg.External
+	extern, err = rosa.NewRemote("http://example.com:80", pub, server.Client())
+	if err != nil {
+		t.Fatal(err)
+	}
+	c.SetExternal(extern)
+
+	var got unique.Handle[pkg.Checksum]
+	if _, got, err = c.Cure(a); err != nil {
+		t.Fatal(err)
+	} else if got.Value() != wantChecksum {
+		t.Logf(
+			"Cure: checksum = %s, want %s",
+			pkg.Encode(got.Value()), pkg.Encode(wantChecksum),
+		)
+	}
+}
-- 
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