From 367d7151ce25bce7137de4cb436d5017f1f53c24 Mon Sep 17 00:00:00 2001
From: gfanton <8671905+gfanton@users.noreply.github.com>
Date: Tue, 1 Aug 2023 19:35:15 +0200
Subject: [PATCH] feat: add GNO_ROOT_DIR environment variables

This PR adds the ability to obtain the root directory from the GNO_ROOT_DIR environment variable. If this variable is not set, the root directory is then guessed using the go list command.

Signed-off-by: gfanton <8671905+gfanton@users.noreply.github.com>
---
 gnovm/cmd/gno/util.go | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/gnovm/cmd/gno/util.go b/gnovm/cmd/gno/util.go
index 1bbdb968c45..3de742d2a5a 100644
--- a/gnovm/cmd/gno/util.go
+++ b/gnovm/cmd/gno/util.go
@@ -105,10 +105,16 @@ func fmtDuration(d time.Duration) string {
 }
 
 func guessRootDir() string {
+	// try to get the root directory from the GNOROOT environment variable.
+	if rootdir := os.Getenv("GNOROOT"); rootdir != "" {
+		return filepath.Clean(rootdir)
+	}
+
+	// if GNOROOT is not set, try to guess the root directory using the `go list` command.
 	cmd := exec.Command("go", "list", "-m", "-mod=mod", "-f", "{{.Dir}}", "github.com/gnolang/gno")
 	out, err := cmd.CombinedOutput()
 	if err != nil {
-		log.Fatal("can't guess --root-dir, please fill it manually.")
+		log.Fatal("can't guess --root-dir, please fill it manually or define the GNOROOT environment variable globally.")
 	}
 	rootDir := strings.TrimSpace(string(out))
 	return rootDir