[cip-dev][isar-cip-core][PATCH v2 02/13] initramfs-crypt-hook: Align systemd encryption and clevis encryption

[Quirin Gylstorff <Quirin.Gylstorff@siemens.com>]

From: Quirin Gylstorff <quirin.gylstorff@siemens.com>

The following changes were copied from systemd to clevis:
 - check return of resize command
The following changes were copied form clevis to systemd:
 - check if create_filesystem command is empty
 - use part_device(/dev/*) instead of disk
   label(/dev/disk/by-partlabel/*)

Signed-off-by: Quirin Gylstorff <quirin.gylstorff@siemens.com>
---
 .../files/encrypt_partition.clevis.script     |  6 ++++--
 .../files/encrypt_partition.systemd.script    | 21 +++++++++++--------
 2 files changed, 16 insertions(+), 11 deletions(-)

diff --git a/recipes-initramfs/initramfs-crypt-hook/files/encrypt_partition.clevis.script b/recipes-initramfs/initramfs-crypt-hook/files/encrypt_partition.clevis.script
index 0318966..4e76c44 100644
--- a/recipes-initramfs/initramfs-crypt-hook/files/encrypt_partition.clevis.script
+++ b/recipes-initramfs/initramfs-crypt-hook/files/encrypt_partition.clevis.script
@@ -2,7 +2,7 @@
 #
 # CIP Core, generic profile
 #
-# Copyright (c) Siemens AG, 2023
+# Copyright (c) Siemens AG, 2023-2024
 #
 # Authors:
 #  Quirin Gylstorff <quirin.gylstorff@siemens.com>
@@ -82,7 +82,9 @@ reencrypt_existing_partition() {
 	reduced_size="$(expr "$part_size_blocks" - 65536 )"
 	reduced_size_in_byte="$(expr "$reduced_size" \* 512)"
 	reduced_size_in_kb="$(expr "$reduced_size_in_byte" / 1024)K"
-	resize2fs "$1" "${reduced_size_in_kb}"
+	if ! resize2fs "$1" "${reduced_size_in_kb}"; then
+		panic "reencryption of filesystem $1 cannot continue!"
+	fi
 	if [ -x /usr/sbin/cryptsetup-reencrypt ]; then
 		/usr/sbin/cryptsetup-reencrypt --new --reduce-device-size "$reduce_device_size"k "$1" < "$2"
 	else
diff --git a/recipes-initramfs/initramfs-crypt-hook/files/encrypt_partition.systemd.script b/recipes-initramfs/initramfs-crypt-hook/files/encrypt_partition.systemd.script
index eeeb55a..f97a461 100644
--- a/recipes-initramfs/initramfs-crypt-hook/files/encrypt_partition.systemd.script
+++ b/recipes-initramfs/initramfs-crypt-hook/files/encrypt_partition.systemd.script
@@ -2,7 +2,7 @@
 #
 # CIP Core, generic profile
 #
-# Copyright (c) Siemens AG, 2023
+# Copyright (c) Siemens AG, 2023-2024
 #
 # Authors:
 #  Quirin Gylstorff <quirin.gylstorff@siemens.com>
@@ -47,6 +47,9 @@ modprobe loop
 tpm_device=/dev/tpmrm0
 partition_sets="$PARTITIONS"
 create_file_system_cmd="$CREATE_FILE_SYSTEM_CMD"
+if [ -z "${create_file_system_cmd}" ]; then
+	create_file_system_cmd="mke2fs -t ext4"
+fi
 
 service_watchdog() {
 	for n in $(seq $(($SETUP_TIMEOUT / 10)) ); do
@@ -83,8 +86,7 @@ enroll_tpm2_token() {
 }
 
 reencrypt_existing_partition() {
-	part_device="$(readlink -f "$partition")"
-	part_size_blocks="$(cat /sys/class/block/"$(awk -v dev="$part_device" 'BEGIN{split(dev,a,"/"); print a[3]}' )"/size)"
+	part_size_blocks="$(cat /sys/class/block/"$(awk -v dev="$1" 'BEGIN{split(dev,a,"/"); print a[3]}' )"/size)"
 	# reduce the filesystem and partition by 32M to fit the LUKS header
 	reduce_device_size=32768
 	reduced_size="$(expr "$part_size_blocks" - 65536 )"
@@ -111,15 +113,16 @@ for partition_set in $partition_sets; do
 	partition=/dev/disk/by-partlabel/"$partition_label"
 	crypt_mount_name="encrypted_$partition_label"
 	decrypted_part=/dev/mapper/"$crypt_mount_name"
+	part_device=$(readlink -f "$partition")
 
 	# check if partition is already encrypted with systemd-tpm2
 	if /usr/sbin/cryptsetup luksDump --batch-mode "$partition" \
 			| grep -q "systemd-tpm2"; then
-		open_tpm2_partition "$partition"
 		if ! mount -t "$(get_fstype "${decrypted_part}")" "${decrypted_part}" \
 			 "${rootmnt}${partition_mountpoint}"; then
 			panic "Can't mount encrypted partition '${decrypted_part}'!"
 		fi
+		open_tpm2_partition "$part_device"
 		continue
 	fi
 
@@ -136,15 +139,15 @@ for partition_set in $partition_sets; do
 
 	case "${partition_format}" in
 		"reencrypt")
-			reencrypt_existing_partition "$partition" "$tmp_key"
-			enroll_tpm2_token "$partition" "$tmp_key"
-			open_tpm2_partition "$partition"
+			reencrypt_existing_partition "$part_device" "$tmp_key"
+			enroll_tpm2_token "$part_device" "$tmp_key"
+			open_tpm2_partition "$part_device"
 		;;
 		"format")
 			/usr/sbin/cryptsetup luksFormat --batch-mode \
 				 --type luks2 "$partition" < "$tmp_key"
-			enroll_tpm2_token "$partition" "$tmp_key"
-			open_tpm2_partition "$partition"
+			enroll_tpm2_token "$part_device" "$tmp_key"
+			open_tpm2_partition "$part_device"
 			eval "${create_file_system_cmd} ${decrypted_part}"
 		;;
 		*)
-- 
2.43.0