Fix build of Windows MSI when running as root (#28)

Use permissive file permissions to allow mounting files into Wix Docker container.

Fixes #1424

README.md

@@ -8,7 +8,7 @@ Orbit is the recommended agent for Fleet. But Orbit can be used with or without
 
 ## Try Orbit
 
-#### With [`fleetctl preview` already running](https://github.com/fleetdm/fleet#try-fleet) and [Go](https://golang.org/doc/install) installed:
+#### With [`fleetctl preview` already running](https://github.com/fleetdm/fleet#try-fleet) and [Go](https://golang.org/doc/install) 1.16 installed:
 
 ```bash
 # From within the top-level directory of this repo…

changes/.keep

@@ -0,0 +1 @@
+IGNORE BUT DO NOT REMOVE. THIS IS HERE SO THAT THE DIRECTORY REMAINS

changes/build-msi-root

@@ -0,0 +1 @@
+* Fix permissions for building MSI when packaging as root user. Fixes fleetdm/fleet#1424

cmd/package/package.go

@@ -52,7 +52,7 @@ func main() {
 		&cli.StringFlag{
 			Name:        "version",
 			Usage:       "Version for package product",
-			Value:       "0.0.2",
+			Value:       "0.0.3",
 			Destination: &opt.Version,
 		},
 		&cli.BoolFlag{

pkg/packaging/packaging.go

@@ -3,6 +3,7 @@ package packaging
 
 import (
 	"io"
+	"io/fs"
 	"io/ioutil"
 	"os"
 	"path/filepath"
@@ -114,3 +115,17 @@ func writeSecret(opt Options, orbitRoot string) error {
 
 	return nil
 }
+
+func chmodRecursive(path string, perm os.FileMode) error {
+		return filepath.Walk(path, func(path string, info fs.FileInfo, err error) error {
+			if err != nil {
+				return errors.Wrap(err, "walk error")
+			}
+
+			if err := os.Chmod(path, perm); err != nil {
+				return errors.Wrap(err, "chmod")
+			}
+
+			return nil
+		})
+}

pkg/packaging/windows.go

@@ -59,6 +59,11 @@ func BuildMSI(opt Options) error {
 		return errors.Wrap(err, "write wix file")
 	}
 
+	// Make sure permissions are permissive so that the `wine` user in the Wix Docker container can access files.
+	if err := chmodRecursive(tmpDir, os.ModePerm); err != nil {
+		return err
+	}
+
 	if err := wix.Heat(tmpDir); err != nil {
 		return errors.Wrap(err, "package root files")
 	}