test: Drop support for running tests with podman

When testing in the host's namespace, only docker seems to offer the
required capabilities (due to its daemon/client architecture).

Qeneth tests can still be run in podman. Users will have to install
the docker wrappers for podman to make use of this.

doc/testing.md

@@ -103,10 +103,9 @@ executed.
 Several technologies are leveraged to accomplish this:
 
 - **Containers**: The entire execution is optionally done inside a
-  standardized container environment, using either `podman` or
-  `docker`.  This ensures that the software needed to run the test
-  suite is always available, no matter which distribution the user is
-  running on their machine.
+  standardized `docker` container environment.  This ensures that the
+  software needed to run the test suite is always available, no matter
+  which distribution the user is running on their machine.
 
 - **Python Virtual Environments**: To make sure that the expected
   versions of all Python packages are available, the execution is
@@ -119,6 +118,10 @@ Several technologies are leveraged to accomplish this:
   optionally be started with a virtual topology of DUTs to run the
   tests on.
 
+> `docker` is the only supported container environment when running
+> tests in the host's network namespace. When running on a virtual
+> Qeneth topology, `podman` may also be used by installing the
+> `podman-docker` package from your host system's distro.
 
 Interactive Usage
 -----------------

test/.env

@@ -14,27 +14,10 @@ build_ps1()
     echo "\e[1m\$(date \"+%H:%M:%S\") \h$1\e[0m:\W # "
 }
 
-#
-# Figure out available container runner
-#
-runner()
-{
-    if which podman >/dev/null; then
-	runner=podman
-    elif which docker >/dev/null; then
-	runner=docker
-    else
-	echo "Error: Neither podman or docker is installed, we recommend podman."
-	exit 1
-    fi
-
-    echo "$runner"
-}
-
 #
 # Returns the latest started infamy container
 #
 infamy()
 {
-    $(runner) ps -f name='infamy.*' --format '{{.Names}}' |tail -1
+    docker ps -f name='infamy.*' --format '{{.Names}}' |tail -1
 }

test/env

@@ -85,7 +85,7 @@ name()
     nm=infamy
     id=0
 
-    names=$($(runner) ps -f name='infamy.*' --format '{{.Names}}')
+    names=$(docker ps -f name='infamy.*' --format '{{.Names}}')
     while true; do
 	name="$nm$id"
 	unset hit
@@ -114,9 +114,9 @@ files=
 while getopts "cCf:hiKp:q:t:" opt; do
     case ${opt} in
 	c)
-	    $(runner) image prune -af
-            $(runner) volume prune -f
-            $(runner) container prune -f
+	    docker image prune -af
+            docker volume prune -f
+            docker container prune -f
 	    exit 0
 	    ;;
 	C)
@@ -153,7 +153,7 @@ done
 
 if [ "$containerize" ]; then
     # shellcheck disable=SC2016
-        exec $(runner) run \
+        exec docker 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)
 
-$(runner) exec -it --workdir "$ixdir/test" "$sys" ./env -C sh
+docker exec -it --workdir "$ixdir/test" "$sys" ./env -C sh