scripts: Fix helper edge cases

Propagate patch and module-list failures, normalize the script
directory, and expand the actual Mercurial subrepository name when
matching paths. Keep the existing no-optional-patches behavior
unchanged.

scripts/generate-patched-kernel

@@ -28,7 +28,7 @@ script_dir="$(dirname "$0")"
 if [ "${script_dir#/}" = "${script_dir}" ]; then
   script_dir="$PWD/$script_dir"
 fi
-scriptdir="${scriptdir%/.}"
+script_dir="${script_dir%/.}"
 scst_dir="$(dirname "${script_dir}")"
 
 # shellcheck source=./kernel-functions
@@ -51,5 +51,5 @@ cd "${target}" || exit $?
   grep -v /in-tree/ |
   while read -r p; do
     echo "==== $p"
-    patch -p1 <"${scst_dir}/$p"
+    patch -p1 <"${scst_dir}/$p" || exit $?
   done

scripts/list-non-source-files

@@ -8,7 +8,7 @@ prefix_matches() {
   f="$1"
   shift
   for s in "$@"; do
-    if [ "$f" = "$s" ] || [ "${f#s/}" != "$f" ]; then
+    if [ "$f" = "$s" ] || [ "${f#"$s/"}" != "$f" ]; then
       return 0
     fi
   done

scripts/sign-modules

@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -o pipefail
+
 # Parse modules.order and sign the modules found in that file.
 
 if [ -z "$KDIR" ]; then