BuildSystem: Always download cmake instead of using host's

If cmake was installed from snap, build system would cause an error
because some libfakeroot GLIBC requirement.

script/build.sh

@@ -6,11 +6,6 @@ source $BANAN_SCRIPT_DIR/config.sh
 
 FAKEROOT_FILE="$BANAN_BUILD_DIR/fakeroot-context"
 
-if [[ -z $CMAKE_COMMAND ]]; then
-	echo "No usable cmake binary found" >&2
-	exit 1
-fi
-
 run_fakeroot() {
 	fakeroot -i $FAKEROOT_FILE -s $FAKEROOT_FILE -- /bin/bash -c '$@' bash $@
 }
@@ -19,11 +14,21 @@ make_build_dir () {
 	mkdir -p $BANAN_BUILD_DIR
 	cd $BANAN_BUILD_DIR
 	if ! [[ -f "build.ninja" ]]; then
-		$CMAKE_COMMAND --toolchain=$BANAN_TOOLCHAIN_DIR/Toolchain.txt -G Ninja $BANAN_ROOT_DIR
+		$BANAN_CMAKE --toolchain=$BANAN_TOOLCHAIN_DIR/Toolchain.txt -G Ninja $BANAN_ROOT_DIR
 	fi
 }
 
 build_target () {
+	if ! [[ -f $BANAN_CMAKE ]]; then
+		echo "cmake not found, please re-run toolchain compilation script"
+		exit 1
+	fi
+
+	if ! type ninja &> /dev/null ; then
+		echo "ninja not found" >&2
+		exit 1
+	fi
+
 	make_build_dir
 	if [[ $# -eq 0 ]]; then
 		echo "No target provided"
@@ -34,15 +39,6 @@ build_target () {
 }
 
 build_toolchain () {
-	if [[ -f $BANAN_TOOLCHAIN_PREFIX/bin/$BANAN_TOOLCHAIN_TRIPLE_PREFIX-gcc ]]; then
-		echo "You already seem to have a toolchain."
-		read -e -p "Do you want to rebuild it [y/N]? " choice
-		if ! [[ "$choice" == [Yy]* ]]; then
-			echo "Aborting toolchain rebuild"
-			exit 0
-		fi
-	fi
-
 	$BANAN_TOOLCHAIN_DIR/build.sh
 }
 

script/check-requirements.sh

@@ -1,61 +0,0 @@
-#!/bin/bash
-
-CMAKE_VERSION_REQUIRED="3.26"
-
-version_atleast() {
-	[ "$1" = "$(echo -e "$1\n$2" | sort -rV | head -n1)" ]
-}
-
-download_cmake() {
-	read -e -p "Do you want to download it [y/N]? " choice
-	if ! [[ "$choice" == [Yy]* ]]; then
-		echo "Build requirements not met" >&2
-		return 1
-	fi
-
-	CMAKE_FULL_NAME="cmake-3.26.6-linux-x86_64"
-
-	mkdir -p $BANAN_BUILD_DIR/toolchain
-	mkdir -p $BANAN_TOOLCHAIN_PREFIX/bin
-	mkdir -p $BANAN_TOOLCHAIN_PREFIX/share
-	cd $BANAN_BUILD_DIR/toolchain
-
-	if ! [[ -f $CMAKE_FULL_NAME.tar.gz ]]; then
-		wget https://cmake.org/files/v3.26/$CMAKE_FULL_NAME.tar.gz
-	fi
-
-	if ! [[ -d $CMAKE_FULL_NAME ]]; then
-		tar xf $CMAKE_FULL_NAME.tar.gz
-	fi
-
-	cp -r $CMAKE_FULL_NAME/bin/* $BANAN_TOOLCHAIN_PREFIX/bin/
-	cp -r $CMAKE_FULL_NAME/share/* $BANAN_TOOLCHAIN_PREFIX/share/
-
-	export CMAKE_COMMAND="$BANAN_TOOLCHAIN_PREFIX/bin/cmake"
-}
-
-if ! type ninja &> /dev/null ; then
-	echo "ninja not found" >&2
-	return 1
-fi
-
-if [ -z "$CMAKE_COMMAND" ]; then
-	if [ -f $BANAN_TOOLCHAIN_PREFIX/bin/cmake ]; then
-		export CMAKE_COMMAND="$BANAN_TOOLCHAIN_PREFIX/bin/cmake"
-	else
-		export CMAKE_COMMAND=cmake
-	fi
-fi
-
-if ! type $CMAKE_COMMAND &> /dev/null ; then
-	echo "You don't seem to have cmake installed"
-	download_cmake
-	return 0
-fi
-
-CMAKE_VERSION=$($CMAKE_COMMAND --version | head -n1 | cut -d' ' -f3)
-if ! version_atleast "$CMAKE_VERSION" "$CMAKE_VERSION_REQUIRED" ; then
-	echo "Your cmake version ($CMAKE_VERSION) is less than the required $CMAKE_VERSION_REQUIRED"
-	download_cmake
-	return 0
-fi

script/config.sh

@@ -30,4 +30,4 @@ if [[ -z $BANAN_BOOTLOADER ]]; then
 	export BANAN_BOOTLOADER="BANAN"
 fi
 
-source $BANAN_SCRIPT_DIR/check-requirements.sh
+export BANAN_CMAKE=$BANAN_TOOLCHAIN_PREFIX/bin/cmake

script/install-bootloader.sh

@@ -25,8 +25,8 @@ if [ -z $BANAN_ROOT_DIR ]; then
 	exit 1
 fi
 
-if [ -z $CMAKE_COMMAND ]; then
-	echo "You must set the CMAKE_COMMAND environment variable" >&2
+if [ -z $BANAN_CMAKE ]; then
+	echo "You must set the BANAN_CMAKE environment variable" >&2
 	exit 1
 fi
 
@@ -77,7 +77,7 @@ install_banan_legacy() {
 	if [ ! -d $INSTALLER_BUILD_DIR ]; then
 		mkdir -p $INSTALLER_BUILD_DIR
 		cd $INSTALLER_BUILD_DIR
-		$CMAKE_COMMAND -G Ninja ../..
+		$BANAN_CMAKE -G Ninja ../..
 	fi
 
 	cd $INSTALLER_BUILD_DIR