qemu: export Qemu start script in release tarball

First basic step, we also want a menuconfig-like way of changing the
settings, e.g., networking options.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

board/common/post-image.sh

@@ -52,3 +52,7 @@ fi
 
 # For use outside of the build system, e.g., Qeneth
 ln -sf rootfs.squashfs "$BINARIES_DIR/$NAME$(ver).img"
+
+# Create the necessary files to run Qemu from a build
+grep QEMU_ "$BR2_CONFIG" | sed 's/"images[\/]*/"/g' > "/$BINARIES_DIR/qemu.cfg"
+cp "$BR2_EXTERNAL_INFIX_PATH/qemu/qemu.sh" "/$BINARIES_DIR/"

qemu/qemu.sh

@@ -184,7 +184,13 @@ if [ "$1" ]; then
     cd $1
 fi
 
-load_qemucfg .config
+if [ -f .config ]; then
+    # 'make run' from output/ or build directory
+    load_qemucfg .config
+else
+    # ./qemu.sh from output/images/ or release tarball
+    load_qemucfg qemu.cfg
+fi
 
 echo "Starting Qemu  ::  Ctrl-a x -- exit | Ctrl-a c -- toggle console/monitor"
 line=$(stty -g)