exec: append custom store

This is primarily for chroot stores. This might not be useful however since chroot store breaks builds.

cmd/nix-tool/main.go

@@ -45,11 +45,14 @@ func main() {
 			}
 		}
 
-		var extraArgs []string
+		var (
+			store     nix.Store
+			extraArgs []string
+		)
 		flagStore = strings.TrimSpace(flagStore)
 		if flagStore != string(os.PathSeparator) {
+			store = nix.Local(flagStore)
 			extraArgs = append(extraArgs,
-				"--store", flagStore,
 				// do not use any binary cache
 				nix.FlagOption, nix.OptionBuildUseSubstitutes, nix.ValueFalse,
 				nix.FlagOption, nix.OptionSubstituters, "",
@@ -62,7 +65,7 @@ func main() {
 		if flagVerbose {
 			stderr = os.Stderr
 		}
-		ctx = nix.New(nixCtx, extraArgs, os.Stdout, stderr)
+		ctx = nix.New(nixCtx, store, extraArgs, os.Stdout, stderr)
 
 		return nil
 	}).
@@ -111,7 +114,7 @@ func main() {
 		}
 
 		log.Println("copying to binary cache...")
-		if err := nix.Copy(ctx, flagCacheKeyPath, &nix.BinaryCache{
+		if err := nix.Copy(ctx, &nix.BinaryCache{
 			Compression:         flagCacheComp,
 			ParallelCompression: flagCachePComp,
 			Bucket:              flagCacheBucket,
@@ -119,6 +122,7 @@ func main() {
 			Region:              flagCacheRegion,
 			Scheme:              flagCacheScheme,
 			CredentialsPath:     flagCacheCredPath,
+			KeyPath:             flagCacheKeyPath,
 		}, slices.Values(collective)); err != nil {
 			return commandHandlerError(fmt.Sprintf("cannot copy: %v", err))
 		}