Added new multi bootloader helper functions

* Added: functions/bootloaders.sh . This file adds bootloader functions that are heavily used in efi scenarios where a bootloader can act as a first or an extra bootloader.

Since the introduction of the new switch:

--bootloaders

you can setup it like this:

--bootloaders=syslinux,grub-efi

.

This means that syslinux is the first bootloader and grub-efi is the extra bootloader.

* Added new bootloader functions: Check_Non_First_Bootloader and Check_Non_Extra_Bootloader.

These functions let each one of the bootloaders abort the build because
they cannot perform a role either as a first bootloader or as an extra bootloader.

* Added bootloader functions: Check_First_Bootloader_Role, Check_Extra_Bootloader_Role and Check_Any_Bootloader_Role

These functions let bootloaders to force their default role in a single line.

At the same time many binary bootloaders were rewritten to make use of the new bootloader role functions explained above.

These roles were enforced:

binary_grub-legacy : First bootloader
binary_grub-pc : Either first or extra bootloader
binary_syslinux : Either first or extra bootloader

If a bootloader is tried to be used in a role that it's not meant to be used then the build fails because that might lead to a non-bootable system.

1 files changed, 1 insertions, 18 deletions

diff --git a/scripts/build/binary_syslinux b/scripts/build/binary_syslinux
index 66c14a059..1a442d7a2 100755
--- a/scripts/build/binary_syslinux
+++ b/scripts/build/binary_syslinux
@@ -24,24 +24,7 @@ Arguments "${@}"
 Read_conffiles config/all config/common config/bootstrap config/chroot config/binary config/source
 Set_defaults
 
-FOUND_MYSELF=""
-OLDIFS="$IFS"
-IFS=","
-for BOOTLOADER in ${LB_BOOTLOADERS}
-do
-
-       case ${BOOTLOADER} in
-               "syslinux" )
-                       FOUND_MYSELF="True"
-                       break ;;
-       esac
-
-done
-IFS="$OLDIFS"
-
-if [ -z ${FOUND_MYSELF} ] ; then
-        exit 0
-fi
+Check_Any_Bootloader_Role "syslinux"
 
 Echo_message "Begin installing syslinux..."