add a SIF systemtest

To make sure that the basic functionality is exercised in Skopeo and
c/image CI.

Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

systemtest/020-copy.bats

@@ -144,6 +144,14 @@ function setup() {
     diff -urN $shareddir $dir2/blobs
 }
 
+@test "copy: sif image" {
+    local localimg=dir:$TESTDIR/dir
+
+    run_skopeo copy sif:${TEST_SOURCE_DIR}/testdata/busybox_latest.sif $localimg
+    run_skopeo inspect $localimg --format "{{.Architecture}}"
+    expect_output "amd64"
+}
+
 teardown() {
     podman rm -f reg
 

systemtest/helpers.bash

@@ -1,6 +1,10 @@
 #!/bin/bash
 
-SKOPEO_BINARY=${SKOPEO_BINARY:-$(dirname ${BASH_SOURCE})/../skopeo}
+# Directory containing system test sources
+TEST_SOURCE_DIR=${TEST_SOURCE_DIR:-$(dirname ${BASH_SOURCE})}
+
+# Skopeo executable
+SKOPEO_BINARY=${SKOPEO_BINARY:-${TEST_SOURCE_DIR}/../bin/skopeo}
 
 # Default timeout for a skopeo command.
 SKOPEO_TIMEOUT=${SKOPEO_TIMEOUT:-300}