move-asn1-header-files: error for wrong asn1c

Add a helpful error message if the user doesn't have the expected asn1c
version installed. Link to a new wiki page that explains which branch
one needs to build.

Without this patch, it just complains that HNBAP_Criticality.h can't be
moved.

Change-Id: I11980bf868055bccc05c5338ea330b70022cd874

move-asn1-header-files.sh

@@ -12,6 +12,22 @@ base_dir="$(dirname "$0")"
 include_subdir="$1"
 shift
 
+# Abort if any of the header files are missing
+for i in "$@"; do
+	if ! [ -e "$i" ]; then
+		echo
+		echo "ERROR: file '$i' has not been generated by asn1c!"
+		echo
+		echo "Are you using the Osmocom asn1c fork with the" \
+			"ASN1C_PREFIX feature?"
+		echo
+		echo "More information:"
+		echo "https://osmocom.org/projects/osmohnbgw/wiki/Generate_sources_from_ASN1_files"
+		echo
+		exit 1
+	fi
+done
+
 include_dir="$base_dir/include/$include_subdir"
 mkdir -p "$include_dir"
 echo "$PWD/*.h --> $include_dir"
@@ -27,6 +43,7 @@ collect_sed_commands() {
 }
 
 move_headers() {
+	echo "pwd: $PWD"
 	echo mv $@ "$include_dir/"
 	mv $@ "$include_dir/"
 }