1 files changed, 22 insertions, 0 deletions
diff --git a/builder/dnbd3-rootfs/scripts/utils.sh b/builder/dnbd3-rootfs/scripts/utils.sh
index 4c0ffee2..95a17af4 100644
--- a/builder/dnbd3-rootfs/scripts/utils.sh
+++ b/builder/dnbd3-rootfs/scripts/utils.sh
@@ -99,3 +99,25 @@ function utils_dependency_check() {
     done
     return $result
 }
+function utils_create_partition_via_offset() {
+    local device="$1"
+    local nameOrUUID="$2"
+    local loopDevice=$(losetup -f)
+
+    local sectorSize=$(blockdev --getbsz $device)
+    local partitionInfo=$(partx --raw --noheadings --output START,NAME,UUID /dev/nbd0 2>/dev/null| grep $nameOrUUID)
+    local offsetSectors=$(echo $partitionInfo | cut -d' ' -f1)
+    if [ -z "$offsetSectors" ]; then
+        warn "could not find partition with label/uuid '$nameOrUUID' on device $device"
+        return 1
+    fi
+    #warn $(($offsetSectors*512)) # could overflow on 32bit systems
+    local offsetBytes=$(echo $| awk -v x=$offsetSectors -v y=$sectorSize '{print x * y}')
+
+    # test if mount works directly (problem with btrfs device id)
+    #mount -v -o loop,offset=$offsetBytes $device $mountPoint
+    losetup -v -o $offsetBytes $loopDevice $device
+    echo $loopDevice
+}
+
+