tests: replace local hello world bundle with busybox bundle

Currently only amd64 and arm64v8 tarball have been checked in testdata,
while busybox bundle is downloaded on fly, and supports multiple architectures.

To enable integration tests for more architectures, the hello world
bundle is replaced by busybox one.

Signed-off-by: Shengjing Zhu <zhsj@debian.org>
(cherry picked from commit 66bf371)

tests/integration/README.md

@@ -60,7 +60,7 @@ load helpers
 
 # setup is called at the beginning of every test.
 function setup() {
-  setup_hello
+  setup_busybox
 }
 
 # teardown is called at the end of every test.
@@ -77,5 +77,4 @@ function teardown() {
   # check expected output
   [[ "${output}" == *"Hello"* ]]
 }
-
 ```

tests/integration/debug.bats

@@ -3,7 +3,8 @@
 load helpers
 
 function setup() {
-	setup_hello
+	setup_busybox
+	update_config '.process.args = ["/bin/echo", "Hello World"]'
 }
 
 function teardown() {

tests/integration/get-images.sh

@@ -64,7 +64,3 @@ DEBIAN_IMAGE="$TESTDATA/debian-${arch}.tar.xz"
 get "$DEBIAN_IMAGE" \
 	"https://github.com/debuerreotype/docker-debian-artifacts/raw/dist-${arch}/buster/slim/rootfs.tar.xz"
 echo "DEBIAN_IMAGE=$DEBIAN_IMAGE"
-
-# hello-world is local, no need to download.
-HELLO_IMAGE="$TESTDATA/hello-world-${arch}.tar"
-echo "HELLO_IMAGE=$HELLO_IMAGE"

tests/integration/helpers.bash

@@ -569,11 +569,6 @@ function setup_busybox() {
 	setup_bundle "$BUSYBOX_IMAGE"
 }
 
-function setup_hello() {
-	setup_bundle "$HELLO_IMAGE"
-	update_config '(.. | select(.? == "sh")) |= "/hello"'
-}
-
 function setup_debian() {
 	setup_bundle "$DEBIAN_IMAGE"
 }

tests/integration/mounts_sshfs.bats

@@ -16,7 +16,8 @@ function setup() {
 		skip "test requires working sshfs mounts"
 	fi
 
-	setup_hello
+	setup_busybox
+	update_config '.process.args = ["/bin/echo", "Hello World"]'
 }
 
 function teardown() {

tests/integration/run.bats

@@ -3,7 +3,8 @@
 load helpers
 
 function setup() {
-	setup_hello
+	setup_busybox
+	update_config '.process.args = ["/bin/echo", "Hello World"]'
 }
 
 function teardown() {

tests/integration/spec.bats

@@ -3,7 +3,8 @@
 load helpers
 
 function setup() {
-	setup_hello
+	setup_busybox
+	update_config '.process.args = ["/bin/echo", "Hello World"]'
 }
 
 function teardown() {

tests/integration/start_hello.bats

@@ -3,7 +3,8 @@
 load helpers
 
 function setup() {
-	setup_hello
+	setup_busybox
+	update_config '.process.args = ["/bin/echo", "Hello World"]'
 }
 
 function teardown() {