From 1f769dd9053409565b1384626170ba5c14628d68 Mon Sep 17 00:00:00 2001
From: "Kyle J. McKay" <mackyle@gmail.com>
Date: Sat, 8 Oct 2016 01:02:51 -0700
Subject: [PATCH] install.sh: verify $Girocco::Config::nc_openbsd_bin supports
 -U

Having a netcat (nc) that supports the -U (unix socket) option is
REQUIRED.  Therefore verify that the -U support actually works during
the install process and fail if it does not.

Signed-off-by: Kyle J. McKay <mackyle@gmail.com>
---
 install.sh | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/install.sh b/install.sh
index 036c052..e64c8f7 100755
--- a/install.sh
+++ b/install.sh
@@ -248,6 +248,36 @@ EOT
 	sleep 5
 fi
 
+test_nc_U() {
+	[ -n "$1" ] || return 1
+	_cmdnc="$(command -v "$1" 2>/dev/null || :)"
+	[ -n "$_cmdnc" ] && [ -x "$_cmdnc" ] || return 1
+	_tmpdir="$(mktemp -d /tmp/nc-u-XXXXXX)"
+	[ -n "$_tmpdir" ] && [ -d "$_tmpdir" ] || return 1
+	>"$_tmpdir/output"
+	(sleep 3 | "$_cmdnc" -l -U "$_tmpdir/socket" 2>/dev/null >"$_tmpdir/output" || >"$_tmpdir/failed")&
+	_bgpid="$!"
+	sleep 1
+	echo "testing" | "$_cmdnc" -w 1 -U "$_tmpdir/socket" >/dev/null 2>&1 || >"$_tmpdir/failed"
+	sleep 1
+	kill "$_bgpid" >/dev/null 2>&1 || :
+	read -r _result <"$_tmpdir/output" || :
+	_bad=
+	! [ -e "$_tmpdir/failed" ] || _bad=1
+	rm -rf "$_tmpdir"
+	[ -z "$_bad" ] && [ "$_result" = "testing" ]
+} >/dev/null 2>&1
+
+echo "*** Verifying \$Girocco::Config::nc_openbsd_bin supports -U option..."
+test_nc_U "$cfg_nc_openbsd_bin" || {
+	echo "ERROR: invalid Girocco::Config::nc_openbsd_bin setting" >&2
+	echo "ERROR: \"$cfg_nc_openbsd_bin\" does not grok the -U option" >&2
+	if [ "$(uname -s 2>/dev/null)" = "DragonFly" ]; then
+		echo "ERROR: see the src/dragonfly/README file for a solution" >&2
+	fi
+	exit 1
+}
+
 chown_make() {
 	if [ "$LOGNAME" = root -a -n "$SUDO_USER" -a "$SUDO_USER" != root ]; then
 		find "$@" -user root -print0 2>/dev/null | \
-- 
2.11.4.GIT