chroot hooks are special, they don't get the environment because it gets scrubbed by rootcmd; so we have to call dpkg --print-architecture after all

live-build/ubuntu-core/hooks/01-divert-grub-install.chroot_early

@@ -1,5 +1,7 @@
 #!/bin/sh -ex
 
+ARCH=$(dpkg --print-architecture)
+
 case $ARCH in
     i386|amd64)
         dpkg-divert --quiet --add \

live-build/ubuntu-core/hooks/12-add-foreign-libc6.chroot

@@ -4,7 +4,7 @@ set -ex
 
 echo "I: Checking if we are amd64 and libc6:i386 should be installed"
 
-if [ "$ARCH" = "amd64" ]; then
+if [ "$(dpkg --print-architecture)" = "amd64" ]; then
     echo "I: Enabling i386 multiarch support on amd64"
     dpkg --add-architecture i386
 

live-build/ubuntu-core/hooks/16-ensure-uboot.chroot

@@ -2,7 +2,7 @@
 
 set -e
 
-case $ARCH in
+case "$(dpkg --print-architecture)" in
     arm*)
         mkdir -p /boot/uboot
         cat > /etc/fw_env.config <<EOF

live-build/ubuntu-core/hooks/99-undivert-grub-install.chroot

@@ -1,5 +1,7 @@
 #! /bin/sh -ex
 
+ARCH=$(dpkg --print-architecture)
+
 case $ARCH in
     i386|amd64)
         rm -f /usr/sbin/grub-install

live-build/ubuntu-cpc/hooks/001-divert-sync.chroot_early

@@ -1,6 +1,8 @@
 #!/bin/sh
 set -e
 
+ARCH=$(dpkg --print-architecture)
+
 dpkg-divert --quiet --add --divert /bin/sync.REAL --rename /bin/sync
 cat > /bin/sync <<'EOF'
 #! /bin/sh

live-build/ubuntu-cpc/hooks/999-cpc-fixes.chroot

@@ -18,6 +18,8 @@ _xchroot() {
 }
 
 #### COMMON architecture independent functions
+arch=$(_xchroot "${rootd}" dpkg --print-architecture)
+
 add_serial_console() {
    condev=$1
    idir="$rootd/etc/init"
@@ -125,7 +127,7 @@ fi
 #### END COMMON ARCH FUNCTIONS
 
 
-case $ARCH in
+case $arch in
 	# ARM images are special
 	armhf|arm64)
 		echo "Configuring ARM Serial Port"

live-build/ubuntu-touch/hooks/60-install-click.chroot

@@ -20,10 +20,12 @@ tmpdir="$(mktemp -d)"
 cleanup () { rm -rf "$tmpdir"; }
 trap cleanup EXIT
 
+CLICKARCH=$(dpkg --print-architecture)
+
 wget --no-verbose -O "$tmpdir/click_list" "$click_list"
 for package in $(cat "$tmpdir/click_list")
 do
-    if echo $package | egrep -q "_$ARCH.click|_all.click|_unknown.click|_multi.click"; then
+    if echo $package | egrep -q "_$CLICKARCH.click|_all.click|_unknown.click|_multi.click"; then
         echo "Setting up $package"
         wget --no-verbose -O "$tmpdir/$package" "$click_uri/$package"
 	# FIXME: first attempt, a hard-coded list of the packages that go to