Allow using a different docker binary in Makefile and tests

Necessary for building and testing locally using VirtualBox mode:
export DOCKER='fin docker'

Makefile

@@ -1,4 +1,5 @@
--include env_make
+# Allow using a different docker binary
+DOCKER ?= docker
 
 SHELL = /bin/bash
 VERSION ?= dev
@@ -12,38 +13,38 @@ DOCKSAL_IP=192.168.64.100
 .PHONY: build exec test push shell run start stop logs debug clean release
 
 build:
-	docker build -t ${REPO}:${VERSION} .
+	${DOCKER} build -t ${REPO}:${VERSION} .
 
 test:
 	IMAGE=${REPO}:${VERSION} bats tests/test.bats
 
 push:
-	docker push ${REPO}:${VERSION}
+	${DOCKER} push ${REPO}:${VERSION}
 
 exec:
-	@docker exec ${NAME} ${CMD}
+	@${DOCKER} exec ${NAME} ${CMD}
 
 exec-it:
-	@docker exec -it ${NAME} ${CMD}
+	@${DOCKER} exec -it ${NAME} ${CMD}
 
 shell:
 	@make exec-it -e CMD=sh
 
 run: clean
-	docker run --rm -it -e DNS_DOMAIN=docksal -e DNS_IP=${DOCKSAL_IP} ${REPO}:${VERSION} sh
+	${DOCKER} run --rm -it -e DNS_DOMAIN=docksal -e DNS_IP=${DOCKSAL_IP} ${REPO}:${VERSION} sh
 
 # This is the only place where fin is used/necessary
 start:
 	IMAGE_DNS=${REPO}:${VERSION} fin system reset dns
 
 stop:
-	docker stop ${NAME}
+	${DOCKER} stop ${NAME}
 
 logs:
-	docker logs ${NAME}
+	${DOCKER} logs ${NAME}
 
 logs-follow:
-	docker logs -f ${NAME}
+	${DOCKER} logs -f ${NAME}
 
 show-config:
 	make exec -e CMD="cat /etc/dnsmasq.d/docksal.conf"
@@ -54,6 +55,6 @@ release:
 	@scripts/release.sh
 
 clean:
-	docker rm -vf ${NAME} || true
+	${DOCKER} rm -vf ${NAME} || true
 
 default: build

tests/test.bats

@@ -1,7 +1,7 @@
 #!/usr/bin/env bats
 
 # Debugging
-teardown() {
+teardown () {
 	echo
 	echo "Output:"
 	echo "================================================================"
@@ -14,14 +14,14 @@ teardown() {
 _healthcheck ()
 {
 	local health_status
-	health_status=$(docker inspect --format='{{json .State.Health.Status}}' "$1" 2>/dev/null)
+	health_status=$(${DOCKER} inspect --format='{{json .State.Health.Status}}' "$1" 2>/dev/null)
 
 	# Wait for 5s then exit with 0 if a container does not have a health status property
 	# Necessary for backward compatibility with images that do not support health checks
 	if [[ $? != 0 ]]; then
-	echo "Waiting 10s for container to start..."
-	sleep 10
-	return 0
+		echo "Waiting 10s for container to start..."
+		sleep 10
+		return 0
 	fi
 
 	# If it does, check the status
@@ -32,8 +32,8 @@ _healthcheck ()
 _healthcheck_wait ()
 {
 	# Wait for cli to become ready by watching its health status
-	local container_name="${NAME}"
-	local delay=5
+	local container_name="${1}"
+	local delay=1
 	local timeout=30
 	local elapsed=0
 
@@ -58,10 +58,12 @@ _healthcheck_wait ()
 @test "${NAME} container is up and using the \"${IMAGE}\" image" {
 	[[ ${SKIP} == 1 ]] && skip
 
-	run _healthcheck_wait
+	run _healthcheck_wait ${NAME}
 	unset output
 
-	run docker ps --filter "name=${NAME}" --format "{{ .Image }}"
+	# Using "bash -c" here to expand ${DOCKER} (in case it's more that a single word).
+	# Without bats run returns "command not found"
+	run bash -c "${DOCKER} ps --filter 'name=${NAME}' --format '{{ .Image }}'"
 	[[ "$output" =~ "${IMAGE}" ]]
 	unset output
 }