In preparation for removing $(DOCKER_SCRIPT) from the tests/tcg configuration
files, have Make use the same container engine that had been probed at
configure time.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 configure                     | 11 ++++++++---
 tests/docker/Makefile.include |  2 +-
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/configure b/configure
index 6b38b0815c..0fd5a3cfad 100755
--- a/configure
+++ b/configure
@@ -1819,9 +1819,11 @@ esac
 
 container="no"
 if test $use_containers = "yes"; then
-    if has "docker" || has "podman"; then
-        container=$($python $source_path/tests/docker/docker.py probe)
-    fi
+    case $($python $source_path/tests/docker/docker.py probe) in
+        *docker) container=docker ;;
+        podman) container=podman ;;
+        no) container=no ;;
+    esac
 fi
 
 # cross compilers defaults, can be overridden with --cross-cc-ARCH
@@ -2401,6 +2403,9 @@ if test -n "$gdb_bin"; then
     fi
 fi
 
+if test "$container" != no; then
+    echo "ENGINE=$container" >> $config_host_mak
+fi
 echo "ROMS=$roms" >> $config_host_mak
 echo "MAKE=$make" >> $config_host_mak
 echo "PYTHON=$python" >> $config_host_mak
diff --git a/tests/docker/Makefile.include b/tests/docker/Makefile.include
index e68f91b853..d9b6ab7b41 100644
--- a/tests/docker/Makefile.include
+++ b/tests/docker/Makefile.include
@@ -14,7 +14,7 @@ DOCKER_DEFAULT_REGISTRY := registry.gitlab.com/qemu-project/qemu
 endif
 DOCKER_REGISTRY := $(if $(REGISTRY),$(REGISTRY),$(DOCKER_DEFAULT_REGISTRY))
 
-ENGINE := auto
+ENGINE ?= auto
 DOCKER_SCRIPT=$(SRC_PATH)/tests/docker/docker.py --engine $(ENGINE)
 
 CUR_TIME := $(shell date +%Y-%m-%d-%H.%M.%S.$$$$)
-- 
2.36.1