bootloaders: fix ignoring LB_DEBIAN_INSTALLER_GUI in menu creation

LB_DEBIAN_INSTALLER_GUI defines whether or not to provide the graphical
installer. the installer_debian-installer script pays attention to it and
does not download it if not wanted. the actual bootloaders however
(both grub2/loopback and syslinux) ignore it, which leaves broken and
unwanted menu entries. this fixes that.

Gbp-Dch: Short
Closes: #952890

scripts/build/binary_loopback_cfg

@@ -247,6 +247,7 @@ then
 	INITRD_GI="/install/gtk/initrd.gz"
 	APPEND_GI="video=vesa:ywrap,mtrr vga=788 quiet ${LB_BOOTAPPEND_INSTALL}"
 
+	if [ "${LB_DEBIAN_INSTALLER_GUI}" = "true" ]; then
 		Grub_install_entry "Start installer" "installgui" "${KERNEL_GI}" "${INITRD_GI}" "${APPEND_GI}"
 
 		Grub_install_entry "Install in graphical mode" "installgui" "${KERNEL_GI}" "${INITRD_GI}" "${APPEND_GI}"
@@ -257,6 +258,14 @@ then
 		Grub_install_entry "Automatic install in text mode" "auto" "${KERNEL_DI}" "${INITRD_DI}" "auto=true priority=critical ${APPEND_DI}"
 		Grub_install_entry "Rescue system in graphical mode" "rescuegui" "${KERNEL_GI}" "${INITRD_GI}" "rescue/enable=true ${APPEND_GI}"
 		Grub_install_entry "Rescue system in text mode" "rescue" "${KERNEL_DI}" "${INITRD_DI}" "rescue/enable=true ${APPEND_DI}"
+	else
+		Grub_install_entry "Start installer" "install" "${KERNEL_DI}" "${INITRD_DI}" "${APPEND_DI}"
+
+		Grub_install_entry "Install in text mode" "install" "${KERNEL_DI}" "${INITRD_DI}" "${APPEND_DI}"
+		Grub_install_entry "Expert install in text mode" "expert" "${KERNEL_DI}" "${INITRD_DI}" "priority=low ${APPEND_DI}"
+		Grub_install_entry "Automatic install in text mode" "auto" "${KERNEL_DI}" "${INITRD_DI}" "auto=true priority=critical ${APPEND_DI}"
+		Grub_install_entry "Rescue system in text mode" "rescue" "${KERNEL_DI}" "${INITRD_DI}" "rescue/enable=true ${APPEND_DI}"
+	fi
 fi
 
 # Assembling memtest configuration

scripts/build/binary_syslinux

@@ -150,6 +150,15 @@ case "${LB_BUILD_WITH_CHROOT}" in
 		;;
 esac
 
+# Use correct install menu set
+if [ "${LB_DEBIAN_INSTALLER_GUI}" = "true" ]; then
+	rm "${_TARGET}"/install_text.cfg
+	mv "${_TARGET}"/install_gui.cfg "${_TARGET}"/install.cfg
+else
+	rm "${_TARGET}"/install_gui.cfg
+	mv "${_TARGET}"/install_text.cfg "${_TARGET}"/install.cfg
+fi
+
 # Configuring files
 if [ -e "${_TARGET}/live.cfg.in" ]
 then

share/bootloaders/extlinux/install_text.cfg

@@ -0,0 +1,5 @@
+label install
+	menu label ^Install
+	linux /install/vmlinuz
+	initrd /install/initrd.gz
+	append vga=788 @APPEND_INSTALL@ --- quiet

share/bootloaders/isolinux/install_text.cfg

@@ -0,0 +1,5 @@
+label install
+	menu label ^Install
+	linux /install/vmlinuz
+	initrd /install/initrd.gz
+	append vga=788 @APPEND_INSTALL@ --- quiet

share/bootloaders/pxelinux/install_text.cfg

@@ -0,0 +1,5 @@
+label install
+	menu label ^Install
+	linux /install/vmlinuz
+	initrd /install/initrd.gz
+	append vga=788 @APPEND_INSTALL@ --- quiet

share/bootloaders/syslinux/install_text.cfg

@@ -0,0 +1,5 @@
+label install
+	menu label ^Install
+	linux /install/vmlinuz
+	initrd /install/initrd.gz
+	append vga=788 @APPEND_INSTALL@ --- quiet