wg-quick: darwin: use bash from environment and require bash 4+

For properly configured Homebrew installations /usr/local/bin should be
before /bin, so this should still work. This allows the script to be
used in more than one setting.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

2 files changed, 23 insertions, 23 deletions

diff --git a/src/wg-quick/darwin.bash b/src/wg-quick/darwin.bash
index ba1e49b..4a3240c 100755
--- a/src/wg-quick/darwin.bash
+++ b/src/wg-quick/darwin.bash
@@ -1,11 +1,9 @@
-#!/usr/local/bin/bash
+#!/usr/bin/env bash
 # SPDX-License-Identifier: GPL-2.0
 #
 # Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
 #
 
-# The shebang is in /usr/local because this requires bash 4.
-
 set -e -o pipefail
 shopt -s extglob
 export LC_ALL=C
@@ -29,6 +27,18 @@ CONFIG_FILE=""
 PROGRAM="${0##*/}"
 ARGS=( "$@" )
 
+cmd() {
+	echo "[#] $*" >&2
+	"$@"
+}
+
+die() {
+	echo "$PROGRAM: $*" >&2
+	exit 1
+}
+
+[[ ${BASH_VERSINFO[0]} -ge 4 ]] || die "Version mismatch: bash ${BASH_VERSINFO[0]} detected, when bash 4+ required"
+
 parse_options() {
 	local interface_section=0 line key value stripped
 	CONFIG_FILE="$1"
@@ -71,16 +81,6 @@ read_bool() {
 	esac
 }
 
-cmd() {
-	echo "[#] $*" >&2
-	"$@"
-}
-
-die() {
-	echo "$PROGRAM: $*" >&2
-	exit 1
-}
-
 auto_su() {
 	[[ $UID == 0 ]] || exec sudo -p "$PROGRAM must be run as root. Please enter the password for %u to continue: " "$SELF" "${ARGS[@]}"
 }
diff --git a/src/wg-quick/linux.bash b/src/wg-quick/linux.bash
index cd66b4d..38ccad2 100755
--- a/src/wg-quick/linux.bash
+++ b/src/wg-quick/linux.bash
@@ -26,6 +26,16 @@ CONFIG_FILE=""
 PROGRAM="${0##*/}"
 ARGS=( "$@" )
 
+cmd() {
+	echo "[#] $*" >&2
+	"$@"
+}
+
+die() {
+	echo "$PROGRAM: $*" >&2
+	exit 1
+}
+
 parse_options() {
 	local interface_section=0 line key value stripped
 	CONFIG_FILE="$1"
@@ -68,16 +78,6 @@ read_bool() {
 	esac
 }
 
-cmd() {
-	echo "[#] $*" >&2
-	"$@"
-}
-
-die() {
-	echo "$PROGRAM: $*" >&2
-	exit 1
-}
-
 auto_su() {
 	[[ $UID == 0 ]] || exec sudo -p "$PROGRAM must be run as root. Please enter the password for %u to continue: " "$SELF" "${ARGS[@]}"
 }