From 9ed3ba85eaba4bc4bd12b290dc4daf00ffe159dc Mon Sep 17 00:00:00 2001
From: Ophestra <cat@gensokyo.uk>
Date: Fri, 15 Aug 2025 03:30:51 +0900
Subject: hst/fs: implement overlay fstype

This finally exposes overlay mounts in the high level hakurei API.

Signed-off-by: Ophestra <cat@gensokyo.uk>
---
 hst/fsoverlay_test.go | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 hst/fsoverlay_test.go

(limited to 'hst/fsoverlay_test.go')

diff --git a/hst/fsoverlay_test.go b/hst/fsoverlay_test.go
new file mode 100644
index 00000000..18ed0773
--- /dev/null
+++ b/hst/fsoverlay_test.go
@@ -0,0 +1,50 @@
+package hst_test
+
+import (
+	"testing"
+
+	"hakurei.app/container"
+	"hakurei.app/hst"
+)
+
+func TestFSOverlay(t *testing.T) {
+	checkFs(t, []fsTestCase{
+		{"nil", (*hst.FSOverlay)(nil), false, nil, nil, nil, "<invalid>"},
+		{"nil lower", &hst.FSOverlay{Dst: m("/etc"), Lower: []*container.Absolute{nil}}, false, nil, nil, nil, "<invalid>"},
+		{"zero lower", &hst.FSOverlay{Dst: m("/etc"), Upper: m("/"), Work: m("/")}, false, nil, nil, nil, "<invalid>"},
+		{"zero lower ro", &hst.FSOverlay{Dst: m("/etc")}, false, nil, nil, nil, "<invalid>"},
+		{"short lower", &hst.FSOverlay{Dst: m("/etc"), Lower: ms("/etc")}, false, nil, nil, nil, "<invalid>"},
+
+		{"full", &hst.FSOverlay{
+			Dst:   m("/nix/store"),
+			Lower: ms("/mnt-root/nix/.ro-store"),
+			Upper: m("/mnt-root/nix/.rw-store/upper"),
+			Work:  m("/mnt-root/nix/.rw-store/work"),
+		}, true, container.Ops{&container.MountOverlayOp{
+			Target: m("/nix/store"),
+			Lower:  ms("/mnt-root/nix/.ro-store"),
+			Upper:  m("/mnt-root/nix/.rw-store/upper"),
+			Work:   m("/mnt-root/nix/.rw-store/work"),
+		}}, m("/nix/store"), ms("/mnt-root/nix/.rw-store/upper", "/mnt-root/nix/.rw-store/work", "/mnt-root/nix/.ro-store"),
+			"w*/nix/store:/mnt-root/nix/.rw-store/upper:/mnt-root/nix/.rw-store/work:/mnt-root/nix/.ro-store"},
+
+		{"ro", &hst.FSOverlay{
+			Dst:   m("/mnt/src"),
+			Lower: ms("/tmp/.src0", "/tmp/.src1"),
+		}, true, container.Ops{&container.MountOverlayOp{
+			Target: m("/mnt/src"),
+			Lower:  ms("/tmp/.src0", "/tmp/.src1"),
+		}}, m("/mnt/src"), ms("/tmp/.src0", "/tmp/.src1"),
+			"*/mnt/src:/tmp/.src0:/tmp/.src1"},
+
+		{"ro work", &hst.FSOverlay{
+			Dst:   m("/mnt/src"),
+			Lower: ms("/tmp/.src0", "/tmp/.src1"),
+			Work:  m("/tmp"),
+		}, true, container.Ops{&container.MountOverlayOp{
+			Target: m("/mnt/src"),
+			Lower:  ms("/tmp/.src0", "/tmp/.src1"),
+		}}, m("/mnt/src"), ms("/tmp/.src0", "/tmp/.src1"),
+			"*/mnt/src:/tmp/.src0:/tmp/.src1"},
+	})
+}
-- 
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