Bring in goodies from testing.

# Conflicts:
#	docs/testing/wine-proton.md

internal/wine/proton.go

@@ -5,8 +5,6 @@ package wine
 
 import (
 	"bytes"
-	"crypto/sha256"
-	"fmt"
 	"os"
 	"path/filepath"
 	"sort"
@@ -104,81 +102,3 @@ func helper_arguments(controllerOnly bool, settings Settings) []string {
 	}
 	return arguments
 }
-
-// A pressure-vessel wineserver cannot see the host's /usr. Publish complete,
-// immutable helper sets in the home-mounted state directory. Never overwrite
-// an older set: running processes may still have its sidecar mapped.
-func stage_helper(helper string, environment map[string]string) (string, error) {
-	if _, present := environment["PRESSURE_VESSEL_RUNTIME"]; !present {
-		return helper, nil
-	}
-	stateHome := os.Getenv("XDG_STATE_HOME")
-	if stateHome == "" {
-		home, err := os.UserHomeDir()
-		if err != nil {
-			return "", err
-		}
-		stateHome = filepath.Join(home, ".local", "state")
-	}
-	if !filepath.IsAbs(stateHome) {
-		return "", fmt.Errorf("Wine helper state directory must be absolute")
-	}
-	names := []string{filepath.Base(helper), filepath.Base(helper) + ".so", "wine-access-menu.dll", "wine-access-menu32.dll", "wine-access-menu-host32.exe"}
-	contents := make(map[string][]byte)
-	modes := make(map[string]os.FileMode)
-	digest := sha256.New()
-	for _, name := range names {
-		path := filepath.Join(filepath.Dir(helper), name)
-		data, err := os.ReadFile(path)
-		if err != nil {
-			return "", fmt.Errorf("read helper set: %w", err)
-		}
-		info, err := os.Stat(path)
-		if err != nil {
-			return "", err
-		}
-		contents[name], modes[name] = data, 0600
-		if info.Mode().Perm()&0111 != 0 {
-			modes[name] = 0700
-		}
-		fmt.Fprintf(digest, "%s\x00%d\x00%d\x00", name, len(data), modes[name])
-		digest.Write(data)
-	}
-	root := filepath.Join(stateHome, "cthulhu", "wine-access", "helper")
-	if err := os.MkdirAll(root, 0700); err != nil {
-		return "", err
-	}
-	stage := filepath.Join(root, fmt.Sprintf("%x", digest.Sum(nil)))
-	if _, err := os.Stat(stage); os.IsNotExist(err) {
-		temporary, err := os.MkdirTemp(root, ".stage-")
-		if err != nil {
-			return "", err
-		}
-		defer os.RemoveAll(temporary)
-		for _, name := range names {
-			if err := os.WriteFile(filepath.Join(temporary, name), contents[name], modes[name]); err != nil {
-				return "", err
-			}
-		}
-		if err := os.Rename(temporary, stage); err != nil {
-			if info, statErr := os.Stat(stage); statErr != nil || !info.IsDir() {
-				return "", err
-			}
-		}
-	}
-	for _, name := range names {
-		path := filepath.Join(stage, name)
-		data, err := os.ReadFile(path)
-		if err != nil {
-			return "", err
-		}
-		info, err := os.Stat(path)
-		if err != nil {
-			return "", err
-		}
-		if !bytes.Equal(data, contents[name]) || info.Mode().Perm() != modes[name] {
-			return "", fmt.Errorf("incomplete or modified staged Wine helper")
-		}
-	}
-	return filepath.Join(stage, filepath.Base(helper)), nil
-}