zkCircuits: fix BaseDir handling

until now, voconed didn't put the files inside VOCONED_DIR

now:
* `go test ./...` uses ~/.cache/vocdoni/zkCircuits/
* `node` uses ~/.vocdoni/zkCircuits/
* `voconed` uses ~/.voconed/zkCircuits/

and both `node` and `voconed` use `/app/run/zkCircuits` when inside docker

cmd/node/main.go

@@ -348,7 +348,7 @@ func main() {
 
 	// Overwrite the default path to download the zksnarks circuits artifacts
 	// using the global datadir as parent folder.
-	circuit.BaseDir = filepath.Join(globalCfg.DataDir, circuit.BaseDir)
+	circuit.BaseDir = filepath.Join(globalCfg.DataDir, "zkCircuits")
 
 	// Ensure we can have at least 8k open files. This is necessary, since
 	// many components like IPFS and Tendermint require keeping many active

cmd/voconed/voconed.go

@@ -16,6 +16,7 @@ import (
 	"github.com/spf13/viper"
 	"go.vocdoni.io/dvote/api/faucet"
 	"go.vocdoni.io/dvote/crypto/ethereum"
+	"go.vocdoni.io/dvote/crypto/zk/circuit"
 	"go.vocdoni.io/dvote/internal"
 	"go.vocdoni.io/dvote/log"
 	"go.vocdoni.io/dvote/vochain/state"
@@ -178,6 +179,10 @@ func main() {
 
 	log.Infof("using data directory at %s", config.dir)
 
+	// Overwrite the default path to download the zksnarks circuits artifacts
+	// using the global datadir as parent folder.
+	circuit.BaseDir = filepath.Join(config.dir, "zkCircuits")
+
 	mngKey := ethereum.SignKeys{}
 	if err := mngKey.AddHexKey(config.keymanager); err != nil {
 		log.Fatal(err)

crypto/zk/circuit/circuit.go

@@ -19,21 +19,17 @@ var downloadCircuitsTimeout = time.Minute * 5
 
 // BaseDir is where the artifact cache is expected to be found.
 // If the artifacts are not found there, they will be downloaded and stored.
-// If unset ("") it will default to ~/.cache/vocdoni/zkCircuits/
+//
+// Defaults to ~/.cache/vocdoni/zkCircuits/
 //
 // In any case, the LocalDir path associated with the circuit config will be appended at the end
-var BaseDir = ""
-
-func init() {
-	// if base dir is unset, default to ~/.cache/vocdoni/
-	if BaseDir == "" {
-		home, err := os.UserHomeDir()
-		if err != nil {
-			panic(err)
-		}
-		BaseDir = home + "/.cache/vocdoni/zkCircuits"
+var BaseDir = func() string {
+	home, err := os.UserHomeDir()
+	if err != nil {
+		panic(err)
 	}
-}
+	return filepath.Join(home, ".cache", "vocdoni", "zkCircuits")
+}()
 
 // ZkCircuit struct wraps the circuit configuration and contains the file
 // content of the circuit artifacts (provingKey, verificationKey and wasm)

dockerfiles/vocone/.env

@@ -1,5 +1,6 @@
 IMAGE_TAG=main
 # VOCONED_KEYMANAGER=571063b70545d01b8c130bb411b5f0220e06b8db236bb12e77ae478f7078b77b
+VOCONED_DIR=/app/run
 VOCONED_PORT=9090
 VOCONED_URLPATH=/v2
 VOCONED_BLOCKPERIOD=5