hst/fs: implement link fstype

Symlinks do not require special treatment, and doing this allows placing links in order.

Signed-off-by: Ophestra <cat@gensokyo.uk>

hst/fslink_test.go

@@ -0,0 +1,49 @@
+package hst_test
+
+import (
+	"testing"
+
+	"hakurei.app/container"
+	"hakurei.app/hst"
+)
+
+func TestFSLink(t *testing.T) {
+	checkFs(t, []fsTestCase{
+		{"nil", (*hst.FSLink)(nil), false, nil, nil, nil, "<invalid>"},
+		{"zero", new(hst.FSLink), false, nil, nil, nil, "<invalid>"},
+
+		{"deref rel", &hst.FSLink{Target: m("/"), Linkname: ":3", Dereference: true}, false, nil, nil, nil, "<invalid>"},
+		{"deref", &hst.FSLink{
+			Target:      m("/run/current-system"),
+			Linkname:    "/run/current-system",
+			Dereference: true,
+		}, true, container.Ops{
+			&container.SymlinkOp{
+				Target:      m("/run/current-system"),
+				LinkName:    "/run/current-system",
+				Dereference: true,
+			},
+		}, m("/run/current-system"), nil,
+			"&/run/current-system:*/run/current-system"},
+
+		{"direct", &hst.FSLink{
+			Target:   m("/etc/mtab"),
+			Linkname: "/proc/mounts",
+		}, true, container.Ops{
+			&container.SymlinkOp{
+				Target:   m("/etc/mtab"),
+				LinkName: "/proc/mounts",
+			},
+		}, m("/etc/mtab"), nil, "&/etc/mtab:/proc/mounts"},
+
+		{"direct rel", &hst.FSLink{
+			Target:   m("/etc/mtab"),
+			Linkname: "../proc/mounts",
+		}, true, container.Ops{
+			&container.SymlinkOp{
+				Target:   m("/etc/mtab"),
+				LinkName: "../proc/mounts",
+			},
+		}, m("/etc/mtab"), nil, "&/etc/mtab:../proc/mounts"},
+	})
+}