From 29523170630804b6083c6d46ac54d65e06bde176 Mon Sep 17 00:00:00 2001
From: Miquel Sabaté Solà <mssola@mssola.com>
Date: Tue, 23 Sep 2025 16:41:59 +0200
Subject: bin: Guess the QEMU_KERNEL to be used based on cwd
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Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
---
 .bashrc               |  1 -
 bin/run-riscv-qemu.sh | 21 +++++++++++++++++----
 2 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/.bashrc b/.bashrc
index c844f04..8358e1c 100644
--- a/.bashrc
+++ b/.bashrc
@@ -130,7 +130,6 @@ fi
 # Local builds for busybox and the Linux kernel. Needed by scripts like
 # `bin/run-riscv-qemu.sh`.
 export BUSYBOX_SRC="$HOME/src/busybox/1.36.1"
-export QEMU_KERNEL="$HOME/src/git.kernel.org/linux/kernel/riscv/arch/riscv/boot/Image"
 
 ##
 # Misc.
diff --git a/bin/run-riscv-qemu.sh b/bin/run-riscv-qemu.sh
index c96cafb..2e926cf 100755
--- a/bin/run-riscv-qemu.sh
+++ b/bin/run-riscv-qemu.sh
@@ -4,12 +4,25 @@ set -e
 
 # Enfore BUSYBOX_SRC and QEMU_KERNEL.
 if [ -z "$BUSYBOX_SRC" ]; then
-    echo "run-qemu (error): you need to define BUSYBOX_SRC."
+    echo "run-riscv-qemu (error): you need to define BUSYBOX_SRC."
     exit 1
 fi
+
+# If the $QEMU_KERNEL environment variable is not explicitely set, then guess
+# one based on the current working directory.
 if [ -z "$QEMU_KERNEL" ]; then
-    echo "run-qemu (error): you need to define QEMU_KERNEL with the Image to be used."
-    exit 1
+    if [ ! -z "$ARCH" ]; then
+        if [ -f "arch/$ARCH/boot/Image" ]; then
+            QEMU_KERNEL=$(realpath "arch/$ARCH/boot/Image")
+        else
+            echo "run-riscv-qemu (error): you need to define QEMU_KERNEL with the Image to be used."
+            exit 1
+        fi
+        echo "run-riscv-qemu (info): using '$QEMU_KERNEL' as the Linux kernel Image."
+    else
+        echo "run-riscv-qemu (error): you need to define QEMU_KERNEL with the Image to be used."
+        exit 1
+    fi
 fi
 
 # Configurable variables.
@@ -31,7 +44,7 @@ while [[ $# -gt 0 ]]; do
         shift
         ;;
     -*)
-        echo "run-qemu (error): unknown option '$1'."
+        echo "run-riscv-qemu (error): unknown option '$1'."
         exit 1
         ;;
     *)
-- 
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