Read path to hhfab from ENV in reinstall script

Signed-off-by: Pau Capdevila <[email protected]>

pkg/hhfab/vlabhelpers.go

@@ -254,7 +254,8 @@ func (c *Config) prepareReinstallScript() (func(), string, error) {
 	cleanup := func() { os.RemoveAll(dir) }
 
 	path := filepath.Join(dir, "vlabhelpers_reinstall.exp")
-	if err := os.WriteFile(path, []byte(reinstallScript), 0o755); err != nil { //nolint:gosec
+	slog.Info("Creating helper script", "path", path)
+	if err := os.WriteFile(path, []byte(reinstallScript), 0o700); err != nil { //nolint:gosec
 		return cleanup, "", fmt.Errorf("failed to write reinstall script: %w", err)
 	}
 
@@ -292,6 +293,15 @@ func (c *Config) VLABSwitchReinstall(ctx context.Context, opts SwitchReinstallOp
 		}
 	}
 
+	self, err := os.Executable()
+	if err != nil {
+		return fmt.Errorf("getting executable path: %w", err)
+	}
+
+	if err := os.Setenv("HHFAB_BIN", self); err != nil {
+		return fmt.Errorf("setting HHFAB_BIN env variable: %w", err)
+	}
+
 	cleanup, script, err := c.prepareReinstallScript()
 	if err != nil {
 		if cleanup != nil {

pkg/hhfab/vlabhelpers_reinstall.exp

@@ -7,6 +7,7 @@ set timeout -1
 
 # Initialize variables
 set WAIT_READY 0
+set remaining_args {}
 
 # Parse arguments
 for {set i 0} {$i < [llength $argv]} {incr i} {
@@ -70,6 +71,7 @@ set ERROR_GRUB 3
 set ERROR_INSTALL 4
 set ERROR_TIMEOUT 5
 set ERROR_EOF 6
+set ERROR_HHFAB 7
 
 # Define a procedure for GRUB menu handling
 proc handle_grub_menu {SW_NAME KEY_HOME KEY_DOWN ONIE_HIGHLIGHT} {
@@ -102,16 +104,26 @@ proc handle_grub_menu {SW_NAME KEY_HOME KEY_DOWN ONIE_HIGHLIGHT} {
     }
 }
 
-# connect to the serial console of the switch
-# using hhfab now for simplicity but might want to do it directly instead?
-puts "connecting to serial of $SW_NAME via hhfab serial..."
-# check if hhfab is in the local folder or in the path
-set HHFAB "NO"
-if {[file exists "./hhfab"]} {
-	set HHFAB "./hhfab"
-} else {
-	set HHFAB [exec which hhfab]
+# Check if HHFAB_BIN is set in the environment
+set HHFAB [exec echo $env(HHFAB_BIN)]
+
+# Fallback hhfab if it's in the local folder or in PATH
+if {$HHFAB eq ""} {
+	if {[file exists "./hhfab"]} {
+		set HHFAB "./hhfab"
+	} else {
+		set HHFAB [exec which hhfab]
+	}
 }
+
+# Verify that HHFAB contains a valid path
+if {!([file exists $HHFAB] && [file executable $HHFAB])} {
+	log_message "ERR" $SW_NAME "HHFAB does not contain a valid path or is not executable."
+	exit $ERROR_HHFAB
+}
+
+# connect to the serial console of the switch with hhfab
+puts "connecting to serial of $SW_NAME via hhfab serial..."
 spawn $HHFAB vlab serial -n $SW_NAME
 expect {
 	-ex "Type the hot key to suspend the connection: <CTRL>Z" {