topotests: Allow runing under both docker and podman

Signed-off-by: famfo <[email protected]>

tests/topotests/docker/build.sh

@@ -1,11 +1,20 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # SPDX-License-Identifier: MIT
 #
 # Copyright 2018 Network Device Education Foundation, Inc. ("NetDEF")
 
 cd "$(dirname "$0")"/..
 
-exec docker build --pull \
+which docker > /dev/null
+if [[ $? == 0 ]]; then
+    cmd="docker"
+else
+    which podman > /dev/null
+    [[ $? != 0 ]] && echo "Could not find docker or podman executable" && exit 1
+    cmd="podman"
+fi
+
+exec "${cmd}" build --pull \
 		  --compress \
 		  -t frrouting/topotests:latest \
 		  .

tests/topotests/docker/frr-topotests.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # SPDX-License-Identifier: MIT
 #
 # Copyright 2018 Network Device Education Foundation, Inc. ("NetDEF")
@@ -113,10 +113,23 @@ if [ -z "$TOPOTEST_FRR" ]; then
 	git -C "$TOPOTEST_FRR" ls-files -z > "${TOPOTEST_LOGS}/git-ls-files"
 fi
 
+set +e
+
+which docker > /dev/null
+if [[ $? == 0 ]]; then
+    cmd="docker"
+else
+    which podman > /dev/null
+    [[ $? != 0 ]] && echo "Could not find docker or podman executable" && exit 1
+    cmd="podman"
+fi
+
+set -e
+
 if [ -z "$TOPOTEST_BUILDCACHE" ]; then
 	TOPOTEST_BUILDCACHE=topotest-buildcache
-	docker volume inspect "${TOPOTEST_BUILDCACHE}" &> /dev/null \
-		|| docker volume create "${TOPOTEST_BUILDCACHE}"
+	"${cmd}" volume inspect "${TOPOTEST_BUILDCACHE}" &> /dev/null \
+		|| "${cmd}" volume create "${TOPOTEST_BUILDCACHE}"
 fi
 
 if [[ -n "$TMUX" ]]; then
@@ -145,4 +158,4 @@ if [ -t 0 ]; then
 	set -- -t "$@"
 fi
 
-exec docker run "$@"
+exec "${cmd}" run "$@"