From 844d58c7fbce09d42f4f123cf7d775db84301162 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 GNOROOT environment variables

Adds the ability to obtain the root directory from the GNOROOT 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