config

  1#!/usr/bin/env bash
  2# SPDX-License-Identifier: GPL-2.0
  3# Manipulate options in a .config file from the command line
  4
  5myname=${0##*/}
  6
  7# If no prefix forced, use the default CONFIG_
  8CONFIG_="${CONFIG_-CONFIG_}"
  9
 10# We use an uncommon delimiter for sed substitutions
 11SED_DELIM=$(echo -en "\001")
 12
 13usage() {
 14	cat >&2 <<EOL
 15Manipulate options in a .config file from the command line.
 16Usage:
 17$myname options command ...
 18commands:
 19	--enable|-e option   Enable option
 20	--disable|-d option  Disable option
 21	--module|-m option   Turn option into a module
 22	--set-str option string
 23	                     Set option to "string"
 24	--set-val option value
 25	                     Set option to value
 26	--undefine|-u option Undefine option
 27	--state|-s option    Print state of option (n,y,m,undef)
 28
 29	--enable-after|-E beforeopt option
 30                             Enable option directly after other option
 31	--disable-after|-D beforeopt option
 32                             Disable option directly after other option
 33	--module-after|-M beforeopt option
 34                             Turn option into module directly after other option
 35	--refresh            Refresh the config using old settings
 36
 37	commands can be repeated multiple times
 38
 39options:
 40	--file config-file   .config file to change (default .config)
 41	--keep-case|-k       Keep next symbols' case (dont' upper-case it)
 42
 43$myname doesn't check the validity of the .config file. This is done at next
 44make time.
 45
 46By default, $myname will upper-case the given symbol. Use --keep-case to keep
 47the case of all following symbols unchanged.
 48
 49$myname uses 'CONFIG_' as the default symbol prefix. Set the environment
 50variable CONFIG_ to the prefix to use. Eg.: CONFIG_="FOO_" $myname ...
 51EOL
 52	exit 1
 53}
 54
 55checkarg() {
 56	ARG="$1"
 57	if [ "$ARG" = "" ] ; then
 58		usage
 59	fi
 60	case "$ARG" in
 61	${CONFIG_}*)
 62		ARG="${ARG/${CONFIG_}/}"
 63		;;
 64	esac
 65	if [ "$MUNGE_CASE" = "yes" ] ; then
 66		ARG="`echo $ARG | tr a-z A-Z`"
 67	fi
 68}
 69
 70txt_append() {
 71	local anchor="$1"
 72	local insert="$2"
 73	local infile="$3"
 74	local tmpfile="$infile.swp"
 75
 76	# sed append cmd: 'a\' + newline + text + newline
 77	cmd="$(printf "a\\%b$insert" "\n")"
 78
 79	sed -e "/$anchor/$cmd" "$infile" >"$tmpfile"
 80	# replace original file with the edited one
 81	mv "$tmpfile" "$infile"
 82}
 83
 84txt_subst() {
 85	local before="$1"
 86	local after="$2"
 87	local infile="$3"
 88	local tmpfile="$infile.swp"
 89
 90	sed -e "s$SED_DELIM$before$SED_DELIM$after$SED_DELIM" "$infile" >"$tmpfile"
 91	# replace original file with the edited one
 92	mv "$tmpfile" "$infile"
 93}
 94
 95txt_delete() {
 96	local text="$1"
 97	local infile="$2"
 98	local tmpfile="$infile.swp"
 99
100	sed -e "/$text/d" "$infile" >"$tmpfile"
101	# replace original file with the edited one
102	mv "$tmpfile" "$infile"
103}
104
105set_var() {
106	local name=$1 new=$2 before=$3
107
108	name_re="^($name=|# $name is not set)"
109	before_re="^($before=|# $before is not set)"
110	if test -n "$before" && grep -Eq "$before_re" "$FN"; then
111		txt_append "^$before=" "$new" "$FN"
112		txt_append "^# $before is not set" "$new" "$FN"
113	elif grep -Eq "$name_re" "$FN"; then
114		txt_subst "^$name=.*" "$new" "$FN"
115		txt_subst "^# $name is not set" "$new" "$FN"
116	else
117		echo "$new" >>"$FN"
118	fi
119}
120
121undef_var() {
122	local name=$1
123
124	txt_delete "^$name=" "$FN"
125	txt_delete "^# $name is not set" "$FN"
126}
127
128FN=.config
129CMDS=()
130while [[ $# -gt 0 ]]; do
131	if [ "$1" = "--file" ]; then
132		if [ "$2" = "" ]; then
133			usage
134		fi
135		FN="$2"
136		shift 2
137	else
138		CMDS+=("$1")
139		shift
140	fi
141done
142
143set -- "${CMDS[@]}"
144if [ "$1" = "" ] ; then
145	usage
146fi
147
148MUNGE_CASE=yes
149while [ "$1" != "" ] ; do
150	CMD="$1"
151	shift
152	case "$CMD" in
153	--keep-case|-k)
154		MUNGE_CASE=no
155		continue
156		;;
157	--refresh)
158		;;
159	--*-after|-E|-D|-M)
160		checkarg "$1"
161		A=$ARG
162		checkarg "$2"
163		B=$ARG
164		shift 2
165		;;
166	-*)
167		checkarg "$1"
168		shift
169		;;
170	esac
171	case "$CMD" in
172	--enable|-e)
173		set_var "${CONFIG_}$ARG" "${CONFIG_}$ARG=y"
174		;;
175
176	--disable|-d)
177		set_var "${CONFIG_}$ARG" "# ${CONFIG_}$ARG is not set"
178		;;
179
180	--module|-m)
181		set_var "${CONFIG_}$ARG" "${CONFIG_}$ARG=m"
182		;;
183
184	--set-str)
185		# sed swallows one level of escaping, so we need double-escaping
186		set_var "${CONFIG_}$ARG" "${CONFIG_}$ARG=\"${1//\"/\\\\\"}\""
187		shift
188		;;
189
190	--set-val)
191		set_var "${CONFIG_}$ARG" "${CONFIG_}$ARG=$1"
192		shift
193		;;
194	--undefine|-u)
195		undef_var "${CONFIG_}$ARG"
196		;;
197
198	--state|-s)
199		if grep -q "# ${CONFIG_}$ARG is not set" $FN ; then
200			echo n
201		else
202			V="$(grep "^${CONFIG_}$ARG=" $FN)"
203			if [ $? != 0 ] ; then
204				echo undef
205			else
206				V="${V/#${CONFIG_}$ARG=/}"
207				V="${V/#\"/}"
208				V="${V/%\"/}"
209				V="${V//\\\"/\"}"
210				echo "${V}"
211			fi
212		fi
213		;;
214
215	--enable-after|-E)
216		set_var "${CONFIG_}$B" "${CONFIG_}$B=y" "${CONFIG_}$A"
217		;;
218
219	--disable-after|-D)
220		set_var "${CONFIG_}$B" "# ${CONFIG_}$B is not set" "${CONFIG_}$A"
221		;;
222
223	--module-after|-M)
224		set_var "${CONFIG_}$B" "${CONFIG_}$B=m" "${CONFIG_}$A"
225		;;
226
227	--refresh)
228		yes "" | make oldconfig KCONFIG_CONFIG=$FN
229		;;
230
231	*)
232		echo "bad command: $CMD" >&2
233		usage
234		;;
235	esac
236done