Fix ports build, clarify instructions and README

Author: byteduck

CMakeLists.txt

@@ -92,6 +92,6 @@ ADD_CUSTOM_TARGET(qemu
 )
 
 ADD_CUSTOM_TARGET(tests
-    COMMAND ${CMAKE_SOURCE_DIR}/scripts/qemu.sh kernel-tests=true
+	COMMAND ${CMAKE_COMMAND} -E env "KERNEL_NAME=${KERNEL_EXECUTABLE_NAME}" "ARCH=${CMAKE_SYSTEM_PROCESSOR}" ${CMAKE_SOURCE_DIR}/scripts/qemu.sh kernel-tests=true
     USES_TERMINAL
 )

INSTRUCTIONS.md

@@ -53,13 +53,14 @@ To build something from the `edit` directory, pass the `edited-[thing]` to the `
 ## Building and running duckOS
 1. In the `build/[arch]` directory, run `make install` to build the kernel & programs.
 2. Run `make image` to make the disk image.
+    - If you'd like to add extra files to the image, create a folder named `user` at the root of the repository. These files will be copied to the root of the built image.
 4. Run `make qemu` to run qemu with the image you just made.
 5. Enjoy!
 
 ## Running kernel unit tests
 To run kernel unit tests, run `make install` and `make image` as usual, and then use `make tests` to run tests. Instead of running init, the kernel will run unit tests after booting.
 
-Alternatively, supply the `kernel-tests` kernel argument to run tests.
+Alternatively, supply the `kernel-tests=true` kernel argument to run tests.
 
 ## Raspberry Pi
 *Note: aarch64 support is WIP, and even less likely to work properly on real hardware than in qemu. duckOS currently supports the Raspberry Pi 3B.*

README.md

@@ -109,6 +109,7 @@ Ports can be installed by running [ports.sh](ports/ports.sh) supplied with the d
 Some of the more exciting ports are:
 
 - [DOOM](ports/doom)
+    - You'll need to provide your own DOOM wadfile and put it in the /apps/doom.app/ directory. (See [the build instructions](INSTRUCTIONS.md#building-and-running-duckos) for more details.)
 - [binutils](ports/binutils)
 - [gcc](ports/gcc)
 - [sdl2](ports/sdl2)

ports/ports.sh

@@ -3,9 +3,9 @@
 
 PORTS_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 SOURCE_DIR="$PORTS_DIR/.."
-ROOT_DIR="$SOURCE_DIR/cmake-build/root"
+ROOT_DIR="$SOURCE_DIR/build/i686/root"
 PORTS_D_DIR="$ROOT_DIR/usr/ports.d"
-PATH="$PATH:$SOURCE_DIR/toolchain/tools/bin"
+PATH="$PATH:$SOURCE_DIR/toolchain/tools/i686/bin"
 NUM_JOBS=$(( $(nproc) / 2 ))
 
 SED_BIN="sed"