tests/shell: prettify JSON in test output and add helper

- add helper script "json-pretty.sh" for prettify/format JSON.
  It uses either `jq` or a `python` fallback. In my tests, they
  produce the same output, but the output is not guaranteed to be
  stable. This is mainly for informational purpose.

- add a "json-diff-pretty.sh" which prettifies two JSON inputs and
  shows a diff of them.

- in "test-wrapper.sh", after the check for a .json-nft dump fails, also
  call "json-diff-pretty.sh" and write the output to "ruleset-diff.json.pretty".
  This is beside "ruleset-diff.json", which contains the original diff.

Signed-off-by: Thomas Haller <thaller@redhat.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/tests/shell/helpers/json-diff-pretty.sh b/tests/shell/helpers/json-diff-pretty.sh
new file mode 100755
index 00000000..bebb7e8e
--- /dev/null
+++ b/tests/shell/helpers/json-diff-pretty.sh
@@ -0,0 +1,17 @@
+#!/bin/bash -e
+
+BASEDIR="$(dirname "$0")"
+
+[ $# -eq 2 ] || (echo "$0: expects two JSON files as arguments" ; exit 1)
+
+FILE1="$1"
+FILE2="$2"
+
+pretty()
+{
+	"$BASEDIR/json-pretty.sh" < "$1" 2>&1 || :
+}
+
+echo "Cmd: \"$0\" \"$FILE1\" \"$FILE2\""
+diff -u "$FILE1" "$FILE2" 2>&1 || :
+diff -u <(pretty "$FILE1") <(pretty "$FILE2") 2>&1 || :