choose base image by arch instead of platform

container-runtime/.gitignore

@@ -4,5 +4,5 @@ bundle.js
 startInit.js
 service/
 service.js
-alpine.squashfs
+*.squashfs
 /tmp

container-runtime/download-base-image.sh

@@ -9,10 +9,11 @@ VERSION=3.19
 ARCH=${ARCH:-$(uname -m)}
 FLAVOR=default
 
-if [ "$ARCH" = "x86_64" ]; then
-    ARCH=amd64
-elif [ "$ARCH" = "aarch64" ]; then
-    ARCH=arm64
+_ARCH=$ARCH
+if [ "$_ARCH" = "x86_64" ]; then
+    _ARCH=amd64
+elif [ "$_ARCH" = "aarch64" ]; then
+    _ARCH=arm64
 fi
 
-curl https://images.linuxcontainers.org/$(curl --silent https://images.linuxcontainers.org/meta/1.0/index-system | grep "^$DISTRO;$VERSION;$ARCH;$FLAVOR;" | head -n1 | sed 's/^.*;//g')/rootfs.squashfs --output alpine.squashfs
+curl https://images.linuxcontainers.org/$(curl --silent https://images.linuxcontainers.org/meta/1.0/index-system | grep "^$DISTRO;$VERSION;$_ARCH;$FLAVOR;" | head -n1 | sed 's/^.*;//g')/rootfs.squashfs --output alpine.${ARCH}.squashfs

container-runtime/update-image.sh

@@ -9,7 +9,7 @@ set -e
 if mountpoint tmp/combined; then sudo umount tmp/combined; fi
 if mountpoint tmp/lower; then sudo umount tmp/lower; fi
 mkdir -p tmp/lower tmp/upper tmp/work tmp/combined
-sudo mount alpine.squashfs tmp/lower
+sudo mount alpine.${ARCH}.squashfs tmp/lower
 sudo mount -t overlay -olowerdir=tmp/lower,upperdir=tmp/upper,workdir=tmp/work overlay tmp/combined
 
 QEMU=
@@ -33,9 +33,9 @@ fi
 
 sudo truncate -s 0 tmp/combined/etc/resolv.conf
 sudo chown -R 0:0 tmp/combined
-rm -f ../build/lib/container-runtime/rootfs.squashfs
+rm -f rootfs.${ARCH}.squashfs
 mkdir -p ../build/lib/container-runtime
-sudo mksquashfs tmp/combined ../build/lib/container-runtime/rootfs.squashfs
+sudo mksquashfs tmp/combined rootfs.${ARCH}.squashfs
 sudo umount tmp/combined
 sudo umount tmp/lower
 sudo rm -rf tmp