BuildSystem: Download correct cmake if it is not available

script/build.sh

@@ -6,6 +6,11 @@ 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 $@
 }
@@ -66,10 +71,6 @@ if [[ $# -eq 0 ]]; then
 	exit 1
 fi
 
-if [[ -z $CMAKE_COMMAND ]]; then
-	export CMAKE_COMMAND=cmake
-fi
-
 case $1 in
 	toolchain)
 		build_toolchain

script/check-requirements.sh

@@ -0,0 +1,53 @@
+#!/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
+	cd $BANAN_BUILD_DIR/toolchain
+
+	wget https://cmake.org/files/v3.26/$CMAKE_FULL_NAME.tar.gz
+	tar xf $CMAKE_FULL_NAME.tar.gz
+	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

@@ -29,3 +29,5 @@ fi
 if [[ -z $BANAN_BOOTLOADER ]]; then
 	export BANAN_BOOTLOADER="BANAN"
 fi
+
+source $BANAN_SCRIPT_DIR/check-requirements.sh

script/install-bootloader.sh

@@ -15,6 +15,11 @@ fi
 if [[ -z $BANAN_ROOT_DIR ]]; then
 	echo "You must set the BANAN_ROOT_DIR environment variable" >&2
 	exit 1
+fi
+
+if [[ -z $CMAKE_COMMAND ]]; then
+	echo "You must set the CMAKE_COMMAND environment variable" >&2
+	exit 1
 fi	
 
 ROOT_PARTITION_INDEX=2
@@ -32,7 +37,7 @@ fi
 if ! [ -d $INSTALLER_BUILD_DIR ]; then
 	mkdir -p $INSTALLER_BUILD_DIR
 	cd $INSTALLER_BUILD_DIR
-	cmake ..
+	$CMAKE_COMMAND ..
 fi
 
 cd $INSTALLER_BUILD_DIR