From 6249b09bd2788945cc85567b9e68362590a65f6d Mon Sep 17 00:00:00 2001
From: Vincent Ollivier <v@vinc.cc>
Date: Mon, 14 Oct 2024 22:47:26 +0200
Subject: [PATCH] Check for device presence

---
 src/api/vga/mod.rs | 12 +++++++++---
 src/usr/render.rs  |  3 ++-
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/src/api/vga/mod.rs b/src/api/vga/mod.rs
index 245d2503..768b586e 100644
--- a/src/api/vga/mod.rs
+++ b/src/api/vga/mod.rs
@@ -1,10 +1,16 @@
 use crate::api::fs;
 
 pub fn graphic_mode() {
-    fs::write("/dev/vga/mode", b"320x200").ok();
+    let dev = "/dev/vga/mode";
+    if fs::is_device(dev) {
+        fs::write(dev, b"320x200").ok();
+    }
 }
 
 pub fn text_mode() {
-    fs::write("/dev/vga/mode", b"80x25").ok();
-    print!("\x1b[2J\x1b[1;1H"); // Clear screen and move to top
+    let dev = "/dev/vga/mode";
+    if fs::is_device(dev) {
+        fs::write(dev, b"80x25").ok();
+        print!("\x1b[2J\x1b[1;1H"); // Clear screen and move to top
+    }
 }
diff --git a/src/usr/render.rs b/src/usr/render.rs
index 8784a0bf..bb7324ac 100644
--- a/src/usr/render.rs
+++ b/src/usr/render.rs
@@ -176,7 +176,8 @@ fn render_bmp(path: &str, config: &mut Config) -> Result<Command, ExitCode> {
                 palette[i * 3 + 1] = *g;
                 palette[i * 3 + 2] = *b;
             }
-            if fs::write("/dev/vga/palette", &palette).is_err() {
+            let dev = "/dev/vga/palette";
+            if !fs::is_device(dev) || fs::write(dev, &palette).is_err() {
                 error!("Could not set palette");
                 return Err(ExitCode::Failure);
             }