From: Jason A. Donenfeld <Jason@zx2c4.com>
Date: Sun, 1 Oct 2017 19:42:32 +0000 (+0200)
Subject: wg-quick: verify wireguard interface in more clever way
X-Git-Tag: v1.0.20191226~218
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cbd2b0531f116c286dd6fffcac78f1af57717037;p=thirdparty%2Fwireguard-tools.git

wg-quick: verify wireguard interface in more clever way

This helps with old Debian which has ancient iproute2, as well as paving
the path toward this script supporting userspace implementations.

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

diff --git a/src/wg-quick.bash b/src/wg-quick.bash
index c70c078..5295c8b 100755
--- a/src/wg-quick.bash
+++ b/src/wg-quick.bash
@@ -249,7 +249,7 @@ cmd_up() {
 }
 
 cmd_down() {
-	[[ -n $(ip link show dev "$INTERFACE" type wireguard 2>/dev/null) ]] || die "\`$INTERFACE' is not a WireGuard interface"
+	[[ " $(wg show interfaces) " == *" $INTERFACE "* ]] || die "\`$INTERFACE' is not a WireGuard interface"
 	execute_hook "$PRE_DOWN"
 	[[ $SAVE_CONFIG -eq 0 ]] || save_config
 	unset_dns