From 85f56f87b04cc7497c0841c3e1016eb9cc2167e1 Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Mon, 29 Jan 2024 15:52:50 +0100
Subject: [dev] find_partitions: Add --rw option to skip scanning ro devices

---
 modules/dev.inc | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/modules/dev.inc b/modules/dev.inc
index 13b042f..c054b63 100644
--- a/modules/dev.inc
+++ b/modules/dev.inc
@@ -8,7 +8,13 @@
 # The output will be a list of matching devices,
 # sorted from largest to smallest.
 dev_find_partitions() {
-	local ID dev target
+	local ID dev target rw
+	# check if only interested in writable devices
+	rw=
+	if [ "$1" = "--rw" ]; then
+		shift
+		rw=1
+	fi
 	# target for the scan, defaults to /dev to check everything
 	if [ "${1:0:1}" = "/" ] && [ -b "$1" ]; then
 		target="$1"
@@ -40,6 +46,7 @@ dev_find_partitions() {
 	done
 	local label number mbrid uuid
 	for dev in $(find $target* -type b); do
+		[ -n "$rw" ] && [ "$( cat "/sys/class/block/$dev/ro" )" = "1" ] && continue
 		dev_get_type "$dev" || continue
 		echo "$dev is $number - MBR=$mbrid, UUID=$uuid, label=$label" >&2
 		if regex_imatch "$mbrid" "^($want_type)$" || regex_imatch "$uuid" "^($want_uuid)$" \
-- 
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