add root resize script

resize.sh

@@ -0,0 +1,63 @@
+#!/bin/bash
+FSTYPE=$(cat /proc/cmdline |tr ' ' '\n' | awk -F= '/rootfstype/{print $2}')
+BLKDEV_ROOTPART=$(findmnt / -o SOURCE -n)
+ROOTPART_SEQ=$(echo $BLKDEV_ROOTPART | grep -o "[0-9]$")
+BLKDEV_ROOTPART_NAME=$(echo $BLKDEV_ROOTPART | cut -d "/" -f 3)
+BLKDEV=/dev/$(find /sys/block/*/ | grep $BLKDEV_ROOTPART_NAME$ | cut -d "/" -f 4)
+RESIZE_TARGET=$BLKDEV_ROOTPART
+
+if [ ! $RESIZER ]; then
+    case $FSTYPE in
+        f2fs)
+            RESIZER=$(which resize.f2fs)
+            ;;
+        ext2|ext3|ext4)
+            RESIZER=$(which resize2fs)
+            ;;
+        btrfs)
+            RESIZER=$(which btrfs)
+            RESIZER_ARGS="filesystem resize max"
+            RESIZE_TARGET="/"
+            mount -o remount,rw $RESIZE_TARGET
+            ;;
+        *)
+            RESIZER=$(which resize.$FSTYPE)
+            echo "FSTYPE is $FSTYPE, RESIZER could be $RESIZER"
+            ;;
+    esac
+    if [ ! -e $RESIZER ]; then
+        echo "Filesystem resizer for $FSTYPE not found!"
+        exit 1
+    fi
+fi
+
+echo "Resizing partiton..."
+parted -s $BLKDEV -- resizepart $ROOTPART_SEQ 100%
+
+echo "Informing kernel..."
+# Make sure we have updated partition info
+partx -u $BLKDEV
+partx -u $BLKDEV_ROOTPART
+partprobe $BLKDEV
+partprobe $BLKDEV_ROOTPART
+
+echo "Resizing filesystem..."
+$RESIZER $RESIZER_ARGS $RESIZE_TARGET
+
+systemctl daemon-reload 2>/dev/null
+ldconfig 2>/dev/null
+
+echo "Syncing to disk..."
+sync && sync
+
+echo ''
+echo "Rebooting in 5 seconds..."
+a=5
+for i in $(seq 1 5); do
+echo $a
+sleep 1
+a=$((a-1))
+done
+
+echo "Rebooting..."
+init 6