Fix shellcheck issue SC2086 (quotes)

SC2086: Double quote to prevent globbing and word splitting.

Also remove it from the exclude list in the CI config file.

debian/salsa-ci.yml

@@ -26,7 +26,7 @@ shellcheck:
   script:
     - apt-get update && apt-get upgrade -y
     - apt-get install -y shellcheck
-    - shellcheck -e SC1090,SC1091,SC2086 -s dash $(find rootfs/etc/initramfs-tools -type f -executable  | xargs grep -l '^#!/bin/sh')
+    - shellcheck -e SC1090,SC1091 -s dash $(find rootfs/etc/initramfs-tools -type f -executable  | xargs grep -l '^#!/bin/sh')
 
 build yamls:
   stage: build

rootfs/etc/initramfs-tools/scripts/local-bottom/rpi-resizerootfs

@@ -14,18 +14,18 @@ esac
 . /scripts/functions
 
 # Given the root partition, get the underlying device and partition number
-rootpart=$(realpath $ROOT)
-rootpart_nr=$(blkid -sPART_ENTRY_NUMBER -o value -p $rootpart)
+rootpart=$(realpath "$ROOT")
+rootpart_nr=$(blkid -sPART_ENTRY_NUMBER -o value -p "$rootpart")
 rootdev="/dev/$(lsblk -no pkname "$rootpart")"
 
 # Parted will detect if the GPT label is messed up and fix it
 # automatically, we just need to tell it to do so.
-parted -s $rootdev print 2>&1 | grep -z "fix the GPT" && {
-    echo "Fix" | parted ---pretend-input-tty $rootdev print
+parted -s "$rootdev" print 2>&1 | grep -z "fix the GPT" && {
+    echo "Fix" | parted ---pretend-input-tty "$rootdev" print
 }
 
 # Check if there's free space at the end of the device
-free_space="$(parted -m -s $rootdev print free | tail -n1 | grep free)"
+free_space="$(parted -m -s "$rootdev" print free | tail -n1 | grep free)"
 if test -z "$free_space"; then
     # Great, we already resized; nothing left to do!
     exit 0
@@ -37,16 +37,16 @@ log_begin_msg "$0 resizing $ROOT"
 umount "${rootmnt:?}"
 
 # Expand the partition size to fill the entire device
-parted -s $rootdev resizepart $rootpart_nr 100%
+parted -s "$rootdev" resizepart "$rootpart_nr" 100%
 
 wait_for_udev 5
 
 # Now resize the filesystem
-partprobe $rootdev
-resize2fs $rootpart
+partprobe "$rootdev"
+resize2fs "$rootpart"
 
 # Remount root
-if ! mount -r ${FSTYPE:+-t "${FSTYPE}"} ${ROOTFLAGS} "${ROOT}" "${rootmnt?}"; then
+if ! mount -r ${FSTYPE:+-t "${FSTYPE}"} "${ROOTFLAGS}" "${ROOT}" "${rootmnt?}"; then
     panic "Failed to mount ${ROOT} as root file system."
 fi