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Add keytab-editor.

keytab-editor is a script that combines yamltab and the default text editor to
offer seamless edition of keytab files.

Xavier G authored on 26/04/2020 21:40:28
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+#!/usr/bin/env bash
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+
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+# Copyright © 2020 Xavier G. <xavier.yamltab@kindwolf.org>
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+# This work is free. You can redistribute it and/or modify it under the
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+# terms of the Do What The Fuck You Want To Public License, Version 2,
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+# as published by Sam Hocevar. See the COPYING file for more details.
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+
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+# Helper variables:
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+yamltab="${YAMLTAB_PATH:-yamltab}"
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+
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+# Helper functions:
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+function edit {
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+	if `which editor > /dev/null`; then
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+		editor "$@"
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+	else
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+		"${EDITOR:-vi}" "$@"
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+	fi
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+}
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+
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+function cleanup {
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+	[ -f "${tmp_file}" ] && unlink "${tmp_file}"
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+	[ -f "${tmp_file}.yaml" ] && unlink "${tmp_file}.yaml"
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+	[ -d "${tmp_dir}" ] && rmdir "${tmp_dir}"
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+}
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+
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+function exit {
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+	cleanup
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+	builtin exit $1
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+}
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+
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+# Expect a keytab file as single argument:
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+keytab="${1:?Usage: $0 keytab}"
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+keytab_filename="$(basename "${keytab}")"
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+
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+# Redundant with the chmod below; might compensate for some whacky editors?
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+umask 0077
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+
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+# Prepare temporary files:
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+tmp_dir="$(mktemp --directory)" || exit $?
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+tmp_file="${tmp_dir}/${keytab_filename}"
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+touch "${tmp_file}" "${tmp_file}.yaml" || exit $?
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+chmod go-rwx "${tmp_file}" "${tmp_file}.yaml" || exit $?
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+
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+# Dump the given keytab as YAML:
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+"${yamltab}" "${keytab}" > "${tmp_file}.yaml" || exit $?
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+md5_before="$(md5sum "${tmp_file}.yaml")"
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+
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+# Edit the keytab as YAML:
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+edit "${tmp_file}.yaml"
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+rc=$?
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+
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+# If the YAML dump was not modified, leave the keytab untouched:
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+md5_after="$(md5sum "${tmp_file}.yaml")"
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+if [ "${md5_before}" == "${md5_after}" ]; then
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+	echo "No changes detected, ${keytab} left untouched."
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+	exit 0
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+else
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+	# Convert the YAML into a binary keytab:
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+	"${yamltab}" "${tmp_file}.yaml" > "${tmp_file}" || exit $?
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+	# Replace the old keytab with the new one:
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+	cat "${tmp_file}" > "${keytab}" || exit $?
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+fi
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+exit $rc