[cip-dev][isar-cip-core][PATCH v3 6/8] overlay: add prerequisite 'encrypt_partition'

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

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

If /var shall be encrypted encrypt_partition needs to be executed
before the overlay script.

If the prerequisite is not available the overlay script will be executed.

Signed-off-by: Quirin Gylstorff <quirin.gylstorff@siemens.com>
---
 .../initramfs-overlay-hook/files/overlay.hook        |  1 +
 .../initramfs-overlay-hook/files/overlay.script.tmpl | 12 +++++++-----
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/recipes-initramfs/initramfs-overlay-hook/files/overlay.hook b/recipes-initramfs/initramfs-overlay-hook/files/overlay.hook
index 5bec258..bc6a682 100644
--- a/recipes-initramfs/initramfs-overlay-hook/files/overlay.hook
+++ b/recipes-initramfs/initramfs-overlay-hook/files/overlay.hook
@@ -23,4 +23,5 @@ esac
 . /usr/share/initramfs-tools/hook-functions
 
 manual_add_modules overlay
+copy_exec /usr/bin/grep
 copy_exec /usr/bin/awk
diff --git a/recipes-initramfs/initramfs-overlay-hook/files/overlay.script.tmpl b/recipes-initramfs/initramfs-overlay-hook/files/overlay.script.tmpl
index 87ec72f..9739197 100644
--- a/recipes-initramfs/initramfs-overlay-hook/files/overlay.script.tmpl
+++ b/recipes-initramfs/initramfs-overlay-hook/files/overlay.script.tmpl
@@ -9,7 +9,7 @@
 #  Quirin Gylstorff <quirin.gylstorff@siemens.com>
 #
 
-PREREQ=""
+PREREQ="encrypt_partition"
 
 prereqs()
 {
@@ -33,10 +33,12 @@ ovl_lower_dirs="${INITRAMFS_OVERLAY_PATHS}"
 
 root_mount_storage=${rootmnt}${ovl_storage_path}
 
-if ! mount -t $(get_fstype /dev/disk/by-label/${ovl_partition_label}) \
-	   /dev/disk/by-label/${ovl_partition_label} \
-	   ${rootmnt}/${ovl_partition_label}; then
-	panic "Can't mount /${ovl_partition_label} partition - overlay will not work!"
+if ! grep -q "${rootmnt}/${ovl_partition_label}" /proc/mounts ; then
+	if ! mount -t $(get_fstype /dev/disk/by-label/${ovl_partition_label}) \
+		 /dev/disk/by-label/${ovl_partition_label} \
+		 ${rootmnt}/${ovl_partition_label}; then
+		panic "Can't mount /${ovl_partition_label} partition - overlay will not work!"
+	fi
 fi
 
 for ovl_lower_dir in ${ovl_lower_dirs}; do
-- 
2.39.1