Resolve relative replacements

This allows us to use user-defined replacements that have a
relative path, since our temporary modules exist in different dirs.

cmd/xcaddy/main.go

@@ -175,7 +175,7 @@ func runDev(ctx context.Context, args []string) error {
  // and since this tool is a carry-through for the user's actual
  // go.mod, we need to transfer their replace directives through
  // to the one we're making
- cmd = exec.Command("go", "list", "-m", "-f={{if .Replace}}{{.Path}} => {{.Replace}}{{end}}", "all")
+ cmd = exec.Command("go", "list", "-m", "-f={{if .Replace}}{{.Path}}=>{{.Replace}}{{end}}", "all")
  cmd.Stderr = os.Stderr
  out, err = cmd.Output()
  if err != nil {
@@ -186,10 +186,14 @@ func runDev(ctx context.Context, args []string) error {
  if len(parts) != 2 || parts[0] == "" || parts[1] == "" {
  continue
  }
- replacements = append(replacements, xcaddy.NewReplace(
- strings.TrimSpace(parts[0]),
- strings.TrimSpace(parts[1]),
- ))
+
+ // adjust relative replacements in original module since our temporary module is in a different directory
+ if !filepath.IsAbs(parts[1]) {
+ parts[1] = filepath.Join(moduleDir, parts[1])
+ log.Printf("[INFO] Resolved relative replacement %s to %s", line, parts[1])
+ }
+
+ replacements = append(replacements, xcaddy.NewReplace(parts[0], parts[1]))
  }
 
  // reconcile remaining path segments; for example if a module foo/a