Only pass if root is really on an encrypted block device somewhere along the
chain of block devices.
---
modules.d/90crypt/check | 37 ++++++++++++++++++++++++++++++++++---
1 files changed, 34 insertions(+), 3 deletions(-)
diff --git a/modules.d/90crypt/check b/modules.d/90crypt/check
index 2297e0f..7d78c4b 100755
--- a/modules.d/90crypt/check
+++ b/modules.d/90crypt/check
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
# if cryptsetup is not installed, then we cannot support encrypted devices.
which cryptsetup >/dev/null 2>&1 || exit 1
@@ -6,8 +6,39 @@ which cryptsetup >/dev/null 2>&1 || exit 1
# hostonly checking should only return true if root is on a LUKS device
# in some way, but I am too lazy to figure out how to do that.
# Instead, fail if we do not have a LUKS device in use somewhere.
-if [ "$1" = "-h" ] ; then
- blkid | grep -q crypt_LUKS || exit 1
+
+is_crypt() { /lib/udev/vol_id /dev/block/$1 |grep -q crypto_LUKS; }
+
+check_block_and_slaves() (
+ # $1 = block device in major:minor format
+ local x
+ cd /sys/dev/block/$1
+ [[ -b /dev/block/$1 ]] || return 1 # Not a block device? So sorry.
+ is_crypt $1 && return
+ [[ -d slaves ]] || return 1 # there are no underlying devices, done.
+ # we want to search the tree breadthwise, so...
+ for x in slaves/*/dev; do
+ is_crypt $(cat "$x") && return 0
+ done
+ for x in slaves/*/dev; do
+ check_block_and_slaves $(cat "$x") && return 0
+ done
+ return 1
+)
+
+if [[ $1 = '-h' ]] ; then
+ rootdev=''
+ while read blkdev fs type opts misc; do
+ [[ $blkdev = rootfs ]] && continue # skip rootfs entry
+ [[ $fs = / ]] && { rootdev=$blkdev; break; }
+ done < /proc/mounts
+ [[ -b $rootdev ]] || exit 1 # Not on a block device? Definitly not
crypted.
+ # get major/minor for the device
+ majmin=$(ls -nLl "$rootdev" | \
+ (read x x x x maj min x; maj=${maj//,/}; echo $maj:$min))
+ # now, walk backwards though our master/slave relationships looking
+ # for a crypt_LUKS device
+ check_block_and_slaves $majmin || exit 1
fi
exit 0
--
1.6.0.4
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