shutdown: leave a comment about cryptsetup v. dmsetup

Remind myself why we can't merge these so I'm not tempted to do this
again in the future.

Signed-off-by: Dave Reisner <dreisner@archlinux.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/shutdown b/shutdown
index b0934b7..a14e479 100644
--- a/shutdown
+++ b/shutdown
@@ -13,6 +13,8 @@ stop_device() {
     devtype=$(lsblk -drno TYPE "/dev/$1" 2>/dev/null) || return 1
     case $devtype in
         crypt)
+            # dmsetup could be used here, but we don't know that it
+            # exists.
             read devname <"$1/dm/name"
             cryptsetup remove "$devname"
             ;;