[PATCH v4 1/4] kdump-lib.sh: introduce a helper to get underlying crypt device
Signed-off-by: Kairui Song <kasong(a)redhat.com>
---
kdump-lib.sh | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/kdump-lib.sh b/kdump-lib.sh
index 4dcd134..ecb2721 100755
--- a/kdump-lib.sh
+++ b/kdump-lib.sh
@@ -958,3 +958,20 @@ kdump_get_arch_recommend_size()
echo $result
return 0
}
+
+# Print all underlying crypt devices of a block device
+# print nothing if device is not on top of a crypt device
+# $1: the block device to be checked in maj:min format
+get_luks_crypt_dev()
+{
+ [[ -b /dev/block/$1 ]] || return 1
+
+ local _type=$(eval "$(blkid -u filesystem,crypto -o export -- /dev/block/$1);
echo \$TYPE")
+ [[ $_type == "crypto_LUKS" ]] && echo $1
+
+ for _x in /sys/dev/block/$1/slaves/*; do
+ [[ -f $_x/dev ]] || continue
+ [[ $_x/subsystem -ef /sys/class/block ]] || continue
+ get_luks_crypt_dev "$(< "$_x/dev")"
+ done
+}
--
2.31.1