hst/fs: interface filesystem config

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

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

hst/config_test.go

@@ -0,0 +1,35 @@
+package hst_test
+
+import (
+	"testing"
+
+	"hakurei.app/container"
+	"hakurei.app/hst"
+)
+
+func TestExtraPermConfig(t *testing.T) {
+	testCases := []struct {
+		name   string
+		config *hst.ExtraPermConfig
+		want   string
+	}{
+		{"nil", nil, "<invalid>"},
+		{"nil path", &hst.ExtraPermConfig{Path: nil}, "<invalid>"},
+		{"r", &hst.ExtraPermConfig{Path: container.AbsFHSRoot, Read: true}, "r--:/"},
+		{"r+", &hst.ExtraPermConfig{Ensure: true, Path: container.AbsFHSRoot, Read: true}, "r--+:/"},
+		{"w", &hst.ExtraPermConfig{Path: hst.AbsTmp, Write: true}, "-w-:/.hakurei"},
+		{"w+", &hst.ExtraPermConfig{Ensure: true, Path: hst.AbsTmp, Write: true}, "-w-+:/.hakurei"},
+		{"x", &hst.ExtraPermConfig{Path: container.AbsFHSRunUser, Execute: true}, "--x:/run/user/"},
+		{"x+", &hst.ExtraPermConfig{Ensure: true, Path: container.AbsFHSRunUser, Execute: true}, "--x+:/run/user/"},
+		{"rwx", &hst.ExtraPermConfig{Path: container.AbsFHSTmp, Read: true, Write: true, Execute: true}, "rwx:/tmp/"},
+		{"rwx+", &hst.ExtraPermConfig{Ensure: true, Path: container.AbsFHSTmp, Read: true, Write: true, Execute: true}, "rwx+:/tmp/"},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			if got := tc.config.String(); got != tc.want {
+				t.Errorf("String: %q, want %q", got, tc.want)
+			}
+		})
+	}
+}