Move the rest of configuration parsing back

Turns out that we are actually using the parsed configuration in showing
help, so let's keep all the configuration together. It is nicer that way
anyway. But let's move the die function to the top so we can use it
during configuration parsing. Fortunately we don't need die_hepling
function which would cause a cycle.

schnapps.sh

@@ -41,6 +41,12 @@ GPG_PASS=""
 ROOT_DEV="$(btrfs fi show / | sed -n 's|.*\(/dev/[^[:blank:]]*\)$|\1|p' | head -n 1)"
 VERSION="@VERSION@"
 
+die() {
+    echo "$@" >&2
+    ERR="${ERR:-1}"
+    exit 1
+}
+
 # Read uci configuration if available
 if [ -f "/lib/functions.sh" ]; then
     . /lib/functions.sh
@@ -58,6 +64,17 @@ if [ -f "/lib/functions.sh" ]; then
     config_get GPG_PASS encrypt pass "$GPG_PASS"
 fi
 
+[ \! -f /etc/schnapps/config ] || . /etc/schnapps/config
+
+if [ "x$1" == "x-d" ]; then
+    ROOT_DEV="$(btrfs fi show $2 | sed -n 's|.*\(/dev/[^[:blank:]]*\)$|\1|p')"
+    shift 2
+fi
+
+[ -n "$ROOT_DEV" ] || die "Can't figure out device to work on"
+ROOT_LABEL="$(btrfs fi label "$ROOT_DEV")"
+[ -z "$ROOT_LABEL" ] || [ \! -f /etc/schnapps/"$ROOT_LABEL" ] || . /etc/schnapps/"$ROOT_LABEL"
+
 # Usage help
 USAGE="Usage: $(basename "$0") [-d root] command [options]
 
@@ -147,13 +164,6 @@ Commands:
   version                 Display version
 "
 
-
-die() {
-    echo "$@" >&2
-    ERR="${ERR:-1}"
-    exit 1
-}
-
 show_help() {
     echo "$USAGE"
 }
@@ -861,17 +871,6 @@ trap_cleanup() {
     exit "$ERR"
 }
 
-[ \! -f /etc/schnapps/config ] || . /etc/schnapps/config
-
-if [ "x$1" == "x-d" ]; then
-    ROOT_DEV="$(btrfs fi show $2 | sed -n 's|.*\(/dev/[^[:blank:]]*\)$|\1|p')"
-    shift 2
-fi
-
-[ -n "$ROOT_DEV" ] || die "Can't figure out device to work on"
-ROOT_LABEL="$(btrfs fi label "$ROOT_DEV")"
-[ -z "$ROOT_LABEL" ] || [ \! -f /etc/schnapps/"$ROOT_LABEL" ] || . /etc/schnapps/"$ROOT_LABEL"
-
 trap 'trap_cleanup' EXIT INT QUIT TERM ABRT
 mount_root