hst/fs: interface filesystem config

This allows mount points to be represented by different underlying structs.

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

hst/fsbind_test.go

@@ -0,0 +1,66 @@
+package hst_test
+
+import (
+	"testing"
+
+	"hakurei.app/container"
+	"hakurei.app/hst"
+)
+
+func TestFSBind(t *testing.T) {
+	checkFs(t, "bind", []fsTestCase{
+		{"nil", (*hst.FSBind)(nil), nil, nil, nil, "<invalid>"},
+
+		{"full", &hst.FSBind{
+			Dst:      m("/dev"),
+			Src:      m("/mnt/dev"),
+			Optional: true,
+			Device:   true,
+		}, container.Ops{&container.BindMountOp{
+			Source: m("/mnt/dev"),
+			Target: m("/dev"),
+			Flags:  container.BindWritable | container.BindDevice | container.BindOptional,
+		}}, m("/dev"), ms("/mnt/dev"),
+			"d+/mnt/dev:/dev"},
+
+		{"full write dev", &hst.FSBind{
+			Dst:    m("/dev"),
+			Src:    m("/mnt/dev"),
+			Write:  true,
+			Device: true,
+		}, container.Ops{&container.BindMountOp{
+			Source: m("/mnt/dev"),
+			Target: m("/dev"),
+			Flags:  container.BindWritable | container.BindDevice,
+		}}, m("/dev"), ms("/mnt/dev"),
+			"d*/mnt/dev:/dev"},
+
+		{"full write", &hst.FSBind{
+			Dst:   m("/tmp"),
+			Src:   m("/mnt/tmp"),
+			Write: true,
+		}, container.Ops{&container.BindMountOp{
+			Source: m("/mnt/tmp"),
+			Target: m("/tmp"),
+			Flags:  container.BindWritable,
+		}}, m("/tmp"), ms("/mnt/tmp"),
+			"w*/mnt/tmp:/tmp"},
+
+		{"full no flags", &hst.FSBind{
+			Dst: m("/etc"),
+			Src: m("/mnt/etc"),
+		}, container.Ops{&container.BindMountOp{
+			Source: m("/mnt/etc"),
+			Target: m("/etc"),
+		}}, m("/etc"), ms("/mnt/etc"),
+			"*/mnt/etc:/etc"},
+
+		{"nil dst", &hst.FSBind{
+			Src: m("/"),
+		}, container.Ops{&container.BindMountOp{
+			Source: m("/"),
+			Target: m("/"),
+		}}, m("/"), ms("/"),
+			"*/"},
+	})
+}