test: build source image from a remote image reference

Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>

test/02-from_image_ref.bats

@@ -0,0 +1,26 @@
+#!/usr/bin/env bats -t
+
+load helpers
+
+@test "Build from image reference" {
+	d=$(mktemp -d)
+    ref="registry.fedoraproject.org/fedora-minimal"
+	run_ctr -v ${d}:/output/ $CTR_IMAGE -i "${ref}"
+	[ "$status" -eq 0 ]
+	#echo ${lines[@]}
+	[[ ${lines[0]} =~ "Getting image source signatures" ]]
+	[[ ${lines[1]} =~ "Copying blob " ]]
+	[[ ${lines[5]} =~ "[SrcImg][INFO] [unpacking] layer sha256:" ]]
+    [[ ${lines[6]} =~ "[SrcImg][INFO] inspecting image reference ${ref}:" ]]
+	[[ ${lines[7]} =~ "[SrcImg][INFO] calling source collection drivers" ]]
+	# get the number of the last line
+	n=$(expr ${#lines[@]} - 1)
+	[[ ${lines[${n}]} =~ "[SrcImg][INFO] copied to oci:/output:latest-source" ]]
+	
+	echo "${d}"
+	[ -f "${d}/index.json" ]
+	[ -f "${d}/oci-layout" ]
+	[ "$(du -b ${d}/index.json | awk '{ print $1 }')" -gt 0 ]
+	[ "$(du -b ${d}/oci-layout | awk '{ print $1 }')" -gt 0 ]
+	[ "$(find ${d} -type f | wc -l)" -gt 5 ]
+}