1 files changed, 96 insertions, 0 deletions
diff --git a/tools/get-options.sh b/tools/get-options.sh
new file mode 100755
index 000000000..49d798ce7
--- /dev/null
+++ b/tools/get-options.sh
@@ -0,0 +1,96 @@
+#!/bin/bash
+
+# This file is part of util-linux.
+#
+# This file 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; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This file 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.
+#
+# Copyright (C) 2025 Christian Goeschel Ndjomouo <cgoesc2@wgu.edu>
+TOP_SRCDIR=${TOP_SRCDIR:-../}
+
+# Directories that contain relevant source files for util-linux programs.
+src_file_paths="$(grep -rE --include="*.c" --exclude="*test_*"          \
+                        --exclude-dir="lib*"                            \
+                        --exclude-dir="po*"                             \
+                        --exclude-dir="tests"                           \
+                        --exclude-dir="tools"                           \
+                        --exclude-dir="bash-completion"                 \
+                        --exclude-dir=".[a-z]*"                         \
+                        --exclude-dir="man-common"                      \
+                        --exclude-dir="Documentation"                   \
+                        --exclude-dir="build*"                          \
+                        -l "getopt_long(_only)?\s*\("                   \
+                )"
+
+# We skip these programs because they do not make use of 'struct option longopts[]'
+# which is passed to getopt(3) for command line argument parsing.
+unsupported_programs='blockdev|fsck|mkfs\.cramfs|pg|renice|whereis'
+
+# In general a program's source file name will be '<program_name>.c', however
+# some tools have differing file names. To handle these special cases we build
+# a hash table with the program name as the key and the actual source file name
+# as the value, the latter will ultimately be passed to find_prog_src().
+typeset -A canonical_src_prefix
+canonical_src_prefix=( \
+        [su]="su-common"
+)
+
+function find_prog_src() {
+        local prog
+        prog="$1"
+
+        for p in ${src_file_paths}; do
+                if [[ "${p##*/}" =~ ^"${prog}".c$ ]]; then
+                        echo "${TOP_SRCDIR}/${p}"
+                        break
+                fi
+        done
+}
+
+function extract_long_opts() {
+        local src_path
+        src_path="$1"
+
+        awk -F ',' 'BEGIN { x = 0 }; \
+                /struct[[:space:]]*option[[:space:]]*.*[[:space:]]*\[\][[:space:]]*=[[:space:]]*(\{)?/ { x = 1 } \
+                x && ! /.*\/\*.*(deprecated|COMPLETION:no).*\*\/.*/ {  print $1 } \
+                /\};/ { x = 0 }' "${src_path}"  \
+                | grep -Eo '".*"'               \
+                | tr -d '"'                     \
+                | sort                          \
+                | awk '{ printf "--%s\n", $0 }' \
+                | grep -v '^--_.*$'
+}
+
+function main() {
+        local progname
+        progname="$1"
+
+        if [[ "$progname" =~ $unsupported_programs ]]; then
+                echo "ENOTSUP"
+                return 0
+        fi
+
+        # Handle special programs that have unusual source file names
+        if [ -n "${canonical_src_prefix[$progname]+exists}" ]; then
+                progname="${canonical_src_prefix[$progname]}"
+        fi
+
+        src_path="$(find_prog_src "$progname")"
+        if [ -z "$src_path" ]; then
+                return 1
+        fi
+
+        extract_long_opts "$src_path"
+
+        return 0
+}
+
+main "$@"