sh: Make use of bashisms in bash scripts

Both [[ ]] and (( )) bashisms are better than the alternative
in POSIX sh, since they are builtin and don't suffer from quoting
or number-of-args issues.

Signed-off-by: Manuel Mendez <mmendez@equinix.com>

deploy/vagrant/scripts/tinkerbell.sh

@@ -34,7 +34,7 @@ setup_nat() (
 main() (
 	export DEBIAN_FRONTEND=noninteractive
 
-	if [ ! -f ./.env ]; then
+	if ! [[ -f ./.env ]]; then
 		./generate-env.sh eth1 >.env
 	fi
 

generate-env.sh

@@ -14,7 +14,7 @@ ERR="${RED:-}ERROR:${RESET:-}"
 source ./current_versions.sh
 
 err() (
-	if [ -z "${1:-}" ]; then
+	if [[ -z ${1:-} ]]; then
 		cat >&2
 	else
 		echo "$ERR " "$@" >&2
@@ -94,7 +94,7 @@ EOF
 )
 
 main() (
-	if [ -z "${1:-}" ]; then
+	if [[ -z ${1:-} ]]; then
 		err "Usage: $0 network-interface-name > .env"
 		exit 1
 	fi

setup.sh

@@ -38,7 +38,7 @@ NEXT="${GREEN:-}NEXT:${RESET:-}"
 get_distribution() (
 	local lsb_dist=""
 	# Every system that we officially support has /etc/os-release
-	if [ -r /etc/os-release ]; then
+	if [[ -r /etc/os-release ]]; then
 		# shellcheck disable=SC1091
 		lsb_dist="$(. /etc/os-release && echo "$ID")"
 	fi
@@ -50,7 +50,7 @@ get_distribution() (
 get_distro_version() (
 	local lsb_version="0"
 	# Every system that we officially support has /etc/os-release
-	if [ -r /etc/os-release ]; then
+	if [[ -r /etc/os-release ]]; then
 		# shellcheck disable=SC1091
 		lsb_version="$(. /etc/os-release && echo "$VERSION_ID")"
 	fi
@@ -112,10 +112,10 @@ setup_networking() (
 	fi
 
 	NAT_INTERFACE=""
-	if [ -r .nat_interface ]; then
+	if [[ -r .nat_interface ]]; then
 		NAT_INTERFACE=$(cat .nat_interface)
 	fi
-	if [ -n "$NAT_INTERFACE" ] && ip addr show "$NAT_INTERFACE" &>/dev/null; then
+	if [[ -n $NAT_INTERFACE ]] && ip addr show "$NAT_INTERFACE" &>/dev/null; then
 		# TODO(nshalman) the terraform code would just run these commands as-is once
 		# but it would be nice to make these more persistent based on OS
 		iptables -A FORWARD -i "$TINKERBELL_NETWORK_INTERFACE" -o "$NAT_INTERFACE" -j ACCEPT
@@ -135,10 +135,10 @@ setup_networking_manually() (
 
 setup_network_forwarding() (
 	# enable IP forwarding for docker
-	if [ "$(sysctl -n net.ipv4.ip_forward)" != "1" ]; then
-		if [ -d /etc/sysctl.d ]; then
+	if (($(sysctl -n net.ipv4.ip_forward) != 1)); then
+		if [[ -d /etc/sysctl.d ]]; then
 			echo "net.ipv4.ip_forward=1" >/etc/sysctl.d/99-tinkerbell.conf
-		elif [ -f /etc/sysctl.conf ]; then
+		elif [[ -f /etc/sysctl.conf ]]; then
 			echo "net.ipv4.ip_forward=1" >>/etc/sysctl.conf
 		fi
 
@@ -171,7 +171,7 @@ setup_networking_netplan() (
 )
 
 setup_networking_ubuntu_legacy() (
-	if [ ! -f /etc/network/interfaces ]; then
+	if ! [[ -f /etc/network/interfaces ]]; then
 		echo "$ERR file /etc/network/interfaces not found"
 		exit 1
 	fi
@@ -224,7 +224,7 @@ EOF
 
 	local cfgfile="/etc/sysconfig/network-scripts/ifcfg-$TINKERBELL_NETWORK_INTERFACE"
 
-	if [ -f "$cfgfile" ]; then
+	if [[ -f $cfgfile ]]; then
 		echo "$ERR network config already exists: $cfgfile"
 		echo "$BLANK Please update it to match this configuration:"
 		echo "$content"
@@ -245,12 +245,12 @@ setup_osie() (
 
 	local osie_current=$STATEDIR/webroot/misc/osie/current
 	local tink_workflow=$STATEDIR/webroot/workflow/
-	if [ ! -d "$osie_current" ] || [ ! -d "$tink_workflow" ]; then
+	if [[ ! -d $osie_current ]] || [[ ! -d $tink_workflow ]]; then
 		mkdir -p "$osie_current"
 		mkdir -p "$tink_workflow"
 		pushd "$SCRATCH"
 
-		if [ -z "${TB_OSIE_TAR:-}" ]; then
+		if [[ -z ${TB_OSIE_TAR:-} ]]; then
 			curl "${OSIE_DOWNLOAD_LINK}" -o ./osie.tar.gz
 			tar -zxf osie.tar.gz
 		else
@@ -305,7 +305,7 @@ check_container_status() (
 		--filter "event=health_status" \
 		--format '{{.Status}}')
 
-	if [ "$status" != "health_status: healthy" ]; then
+	if [[ $status != "health_status: healthy" ]]; then
 		echo "$ERR $container_name is not healthy. status: $status"
 		exit 1
 	fi
@@ -314,7 +314,7 @@ check_container_status() (
 generate_certificates() (
 	mkdir -p "$STATEDIR/certs"
 
-	if [ ! -f "$STATEDIR/certs/ca.json" ]; then
+	if ! [[ -f "$STATEDIR/certs/ca.json" ]]; then
 		jq \
 			'.
 			 | .names[0].L = $facility
@@ -325,7 +325,7 @@ generate_certificates() (
 			>"$STATEDIR/certs/ca.json"
 	fi
 
-	if [ ! -f "$STATEDIR/certs/server-csr.json" ]; then
+	if ! [[ -f "$STATEDIR/certs/server-csr.json" ]]; then
 		jq \
 			'.
 			| .hosts += [ $ip, "tinkerbell.\($facility).packet.net" ]
@@ -353,7 +353,7 @@ generate_certificates() (
 
 	# update host to trust registry certificate
 	if ! cmp --quiet "$STATEDIR/certs/ca.pem" "$certs_dir/tinkerbell.crt"; then
-		if [ ! -d "$certs_dir/tinkerbell.crt" ]; then
+		if ! [[ -d "$certs_dir/" ]]; then
 			# The user will be told to create the directory
 			# in the next block, if copying the certs there
 			# fails.
@@ -363,7 +363,7 @@ generate_certificates() (
 			echo "$ERR please copy $STATEDIR/certs/ca.pem to $certs_dir/tinkerbell.crt"
 			echo "$BLANK and run $0 again:"
 
-			if [ ! -d "$certs_dir" ]; then
+			if ! [[ -d $certs_dir ]]; then
 				echo "sudo mkdir -p '$certs_dir'"
 			fi
 			echo "sudo cp '$STATEDIR/certs/ca.pem' '$certs_dir/tinkerbell.crt'"
@@ -406,7 +406,7 @@ bootstrap_docker_registry() (
 
 setup_docker_registry() (
 	local registry_images="$STATEDIR/registry"
-	if [ ! -d "$registry_images" ]; then
+	if ! [[ -d $registry_images ]]; then
 		mkdir -p "$registry_images"
 	fi
 	start_registry
@@ -469,7 +469,7 @@ check_prerequisites() (
 		;;
 	esac
 
-	if [ $failed -eq 1 ]; then
+	if ((failed == 1)); then
 		echo "$ERR Prerequisites not met. Please install the missing commands and re-run $0."
 		exit 1
 	fi
@@ -489,7 +489,7 @@ do_setup() (
 	echo "$INFO starting tinkerbell stack setup"
 	check_prerequisites "$lsb_dist" "$lsb_version"
 
-	if [ ! -f "$ENV_FILE" ]; then
+	if ! [[ -f $ENV_FILE ]]; then
 		echo "$ERR Run './generate-env.sh network-interface > \"$ENV_FILE\"' before continuing."
 		exit 1
 	fi