test: Reinstate podman as default runner

Partial revert of 23469bbe3b. When running tests in a GitHub action,
we do not want to run as host root user. Therefore, restore podman as
the default runner, but make sure to prefer docker when attaching to
the host network namespace.

test/.env

@@ -8,16 +8,33 @@ ixdir=$(readlink -f "$testdir/..")
 logdir=$(readlink -f "$testdir/.log")
 envdir="$HOME/.infix-test-venv"
 qeneth="$testdir/qeneth/qeneth"
+runners="podman docker"
 
 build_ps1()
 {
     echo "\e[1m\$(date \"+%H:%M:%S\") \h$1\e[0m:\W # "
 }
 
+#
+# Figure out available container runner
+#
+runner()
+{
+    for r in $runners; do
+	which $r >/dev/null && {
+	    echo $r
+	    return
+	}
+    done
+
+    echo "ERROR: No container manager found (tried \"$runners\")" >&2
+    exit 1
+}
+
 #
 # Returns the latest started infamy container
 #
 infamy()
 {
-    docker ps -f name='infamy.*' --format '{{.Names}}' |tail -1
+    $(runner) ps -f name='infamy.*' --format '{{.Names}}' |tail -1
 }

test/env

@@ -23,6 +23,11 @@ usage: test/env [<OPTS>] -f <IMAGE> -q <QENETH-DIR> <COMMAND> [<ARGS>...]
       Don't containerize the command, run it directly in the current
       namespaces
 
+    -D
+      Prefer Docker over podman. This is implied when -t is specified,
+      as podman does not allow the necessary network permissions to be
+      granted to the container
+
     -f <IMAGE>
        Specify images required for test, squashfs image is required
        if testing with kernel. bios and disk image is required if
@@ -86,7 +91,7 @@ name()
     nm=infamy
     id=0
 
-    names=$(docker ps -f name='infamy.*' --format '{{.Names}}')
+    names=$($(runner) ps -f name='infamy.*' --format '{{.Names}}')
     while true; do
 	name="$nm$id"
 	unset hit
@@ -112,17 +117,20 @@ containerize=yes
 [ -c /dev/kvm ] && kvm="--device=/dev/kvm"
 files=
 
-while getopts "cCf:hiKp:q:t:" opt; do
+while getopts "cCDf:hiKp:q:t:" opt; do
     case ${opt} in
 	c)
-	    docker image prune -af
-            docker volume prune -f
-            docker container prune -f
+	    $(runner) image prune -af
+            $(runner) volume prune -f
+            $(runner) container prune -f
 	    exit 0
 	    ;;
 	C)
 	    containerize=
 	    ;;
+	D)
+	    runners="docker podman"
+	    ;;
 	f)
 	    files="$files $OPTARG"
 	    ;;
@@ -145,6 +153,7 @@ while getopts "cCf:hiKp:q:t:" opt; do
 	t)
 	    topology="$OPTARG"
 	    network="--network host --volume $topology:$topology:ro"
+	    runners="docker podman"
 	    ;;
 	*)
 	    >&2 echo "Unknown option -$opt"
@@ -156,7 +165,7 @@ done
 
 if [ "$containerize" ]; then
     # shellcheck disable=SC2016
-        exec docker run \
+        exec $(runner) run \
 	 --cap-add=NET_RAW \
 	 --cap-add=NET_ADMIN \
 	 --device=/dev/net/tun \

test/shell

@@ -17,4 +17,4 @@ usage()
 sys=$1
 [ -n "$sys" ] || sys=$(infamy)
 
-docker exec -it --workdir "$ixdir/test" "$sys" ./env -C sh
+$(runner) exec -it --workdir "$ixdir/test" "$sys" ./env -C sh