simplify --debian-installer choices

`false` and `none` make no sense as choices for this option. Here we
replace `false` with `none`, and remove `true`.

Note that `true` was treated as an alias for netinst (see the changes to
source_disk and and binary_disk).

For backwards compatibility we still allow `true` and `false` by converting
them to `netinst` and `none` respectively, whilst printing a warning to
encourage users to move to `netinst`/`none`.

Gbp-Dch: Short
Closes: #952864

1 files changed, 1 insertions, 1 deletions

diff --git a/scripts/build/installer_preseed b/scripts/build/installer_preseed
index 798c6ae68..8a29ac0a6 100755
--- a/scripts/build/installer_preseed
+++ b/scripts/build/installer_preseed
@@ -27,7 +27,7 @@ Set_defaults
 
 # Check d-i configuration
 case "${LB_DEBIAN_INSTALLER}" in
-	false)
+	none)
 		exit 0
 		;;
 esac