scripts: Group source maintenance helpers under source/

Keep source inventory, cleanup and shell lint helpers together. Update the
Makefile, Debian packaging, scstadmin and the kernel, release and existing
checkpatch callers in the same commit so each consumer uses a valid path.

Keep run-shellcheck rooted at scripts/ after the move, preserving its
coverage of all tracked Bash helpers. Source selection and the existing
checkpatch exclusions are unchanged.

scripts/source/clean-source-tree

@@ -0,0 +1,51 @@
+#!/usr/bin/env bash
+
+shopt -s nullglob
+
+usage() {
+    echo "Usage: $(basename "$0") [ -x <exclude> ]*"
+    exit 1
+}
+
+remove_empty_directories() {
+    find . -depth -type d |
+        sed 's|^\./||' |
+        grep -Ev '^\.$|^\.git/|^\.git$' |
+        while read -r d; do
+	    for f in "$d"/{*,.*}; do
+		if ! [ -e "$f" ]; then
+		    rmdir "$d"
+		fi
+		break
+	    done
+	done
+}
+
+git_options=(-e TAGS)
+
+while [ "${1#-}" != "$1" ]; do
+    case "$1" in
+	-x)
+	    git_options+=(-e "$2")
+	    shift; shift;;
+	*)
+	    usage;;
+    esac
+done
+
+for d in "${@-.}"; do
+  (
+    if cd "$d"; then
+      if [ -e .git ] || [ -e ../.git ]; then
+        if ! type -p git >&/dev/null; then
+          echo "$0: git: not found."
+          exit 0
+        fi
+        git clean -f -d -x "${git_options[@]}" >/dev/null
+        remove_empty_directories
+      else
+        echo "$0: $d: not administered by Git."
+      fi
+    fi
+  )
+done

scripts/source/list-double-blank-lines

@@ -0,0 +1,31 @@
+#!/usr/bin/gawk -f
+
+############################################################################
+#
+# Script that takes a patch as input and lists the line numbers of double
+# blank lines in the input.
+#
+# Copyright (C) 2009 Bart Van Assche <bvanassche@acm.org>
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation, version 2
+# of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+############################################################################
+
+BEGIN {
+  last_is_blank = 0
+}
+
+{
+  is_blank = $0 ~ "^\\+$"
+  if (last_is_blank && is_blank)
+    print NR
+  last_is_blank = is_blank
+}

scripts/source/list-non-source-files

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+export LC_ALL=C
+
+for d in "${@-.}"; do
+(
+  cd "$d" &&
+  if git branch >&/dev/null; then
+    exec 3< <(find . -type f | cut -c3- | grep -v '^\.git/' | sort)
+    git ls-tree -r HEAD | cut -f2 -d'	' | sort |
+      while read -r f; do
+        while { read -r g; } <&3 && [ "$g" '<' "$f" ]; do echo "$g"; done
+      done
+    while { read -r g; } <&3; do echo "$g"; done
+    exec 3<&-
+  else
+    echo "Ignored directory $PWD"
+  fi
+)
+done

scripts/source/list-source-files

@@ -0,0 +1,57 @@
+#!/bin/bash
+
+list_source_files() {
+  local d r
+
+  d="$(cd "$1" && echo "$PWD")"
+  r="$d"
+  while [ "$r" != "/" ] && [ ! -e "$r/.git" ]; do
+    r="$(dirname "$r")"
+  done
+
+  if [ -e "$r/.git" ]; then
+    subdir="${d#"${r}"}"
+    if [ "$r" != "" ]; then
+      ( cd "$d" && git ls-tree --name-only -r HEAD ) | sed "s|^$subdir/||"
+    else
+      echo "Ignored directory $1" >&2
+    fi
+  else
+    (
+      cd "$d" &&
+      find . -type f -o -type l |
+      sed -e 's/^\.\///'				\
+	  -e '/\.depend_\(adm\|d\|f\)$/d'		\
+	  -e '/\.o$/d'					\
+	  -e '/\.o\.d$/d'				\
+	  -e '/\.o\.cmd$/d'				\
+	  -e '/\.ko$/d'					\
+	  -e '/\.ko\.cmd$/d'				\
+	  -e '/\.mod$/d'				\
+	  -e '/\.mod\.c$/d'				\
+	  -e '/\.mod\.cmd$/d'				\
+	  -e '/\/Module\.\(symver\|marker\)s$/d'	\
+	  -e '/\/\.Module\.symvers\.cmd$/d'		\
+	  -e '/\/\.modules\.order\.cmd$/d'		\
+	  -e '/\/\.tmp_versions\(\/\|$\)/d'		\
+	  -e '/\/blib\//d'				\
+	  -e '/\/conftest\/.*\/build-output-.*\.txt$/d'	\
+	  -e '/\/conftest\/.*\/result-.*\.txt$/d'	\
+	  -e '/\/modules\.order$/d'			\
+	  -e '/\/rpmbuilddir\//d'			\
+	  -e '/^iscsi-scst\/usr\/iscsi-scst-adm$/d'	\
+	  -e '/^iscsi-scst\/usr\/iscsi-scstd$/d'	\
+	  -e '/^rpmbuilddir\//d'			\
+	  -e '/^usr\/fileio\/fileio_tgt$/d'		\
+	  -e '/^usr\/stpgd\/stpgd$/d'			\
+	  -e '/debian\/tmp\//d'				\
+	  -e '/~$/d'
+    )
+  fi | sort
+}
+
+if [ $# = 0 ]; then
+  list_source_files "$PWD"
+else
+  for d in "$@"; do list_source_files "$d"; done
+fi

scripts/source/run-shellcheck

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+set -euo pipefail
+
+script_dir="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
+
+if ! command -v shellcheck >/dev/null 2>&1; then
+  echo "Error: shellcheck has not been installed." >&2
+  exit 1
+fi
+
+scripts_root="$(dirname -- "$script_dir")"
+source_files="$("$script_dir/list-source-files" "$scripts_root")"
+
+cd "$scripts_root"
+
+bash_scripts=()
+while IFS= read -r file; do
+  [ -n "$file" ] || continue
+  IFS= read -r first_line < "$file" || first_line=
+  case "$first_line" in
+    '#!'*bash*) bash_scripts+=("$file");;
+  esac
+done <<<"$source_files"
+
+if [ "${#bash_scripts[@]}" -eq 0 ]; then
+  echo "Error: no Bash scripts found under scripts/." >&2
+  exit 1
+fi
+
+shellcheck -x -P SCRIPTDIR "${bash_scripts[@]}"