From 88ab56c61779402d02ef8c577112b25d33f41f03 Mon Sep 17 00:00:00 2001
From: cytopia <cytopia@everythingcli.org>
Date: Wed, 25 Jul 2018 17:17:36 +0200
Subject: [PATCH] Harden linkcheck

---
 docs/linkcheck.sh | 37 ++++++++++++++++++++++++++++++-------
 1 file changed, 30 insertions(+), 7 deletions(-)

diff --git a/docs/linkcheck.sh b/docs/linkcheck.sh
index 2f5c00f0..8b5bc4ce 100755
--- a/docs/linkcheck.sh
+++ b/docs/linkcheck.sh
@@ -1,19 +1,42 @@
 #!/usr/bin/env bash
 
+setval() {
+	printf -v "$1" "%s" "$(cat)";
+	declare -p "$1";
+}
 
 RETURN=0
 
 for url in $(find _includes/ -name \*.rst -exec grep -Eo 'http(s)?://[-?:,._a/#-Z0-9]+' {} \; | sort -u ); do
 
-	header="$( curl -I "${url}" 2>/dev/null )"
-	line="$( echo "${header}" | grep -E '^HTTP/(1|2)' )"
-	stat="$( echo "${line}" | awk '{print $2}' )"
+	# Try to curl multiple times in case host is currently not reachable
+	max=60; i=0; fail=0
+	eval "$( curl -SsI "${url}" 2> >(setval errval) > >(setval header); <<<"$?" setval retval;  )"
+	while [ "${retval}" != "0" ] ; do
+	#while ! header="$( curl -I "${url}" 2>/dev/null )"; do
+		i=$(( i + 1 ))
+		sleep 2
+		if [ "${i}" -gt "${max}" ]; then
+			fail=1
+			break;
+		fi
+	done
 
-	if [ "${stat}" != "200" ]; then
-		printf "\e[0;31m[ERR]\e[0m %s %s\n" "${url}" "${line}"
-		RETURN=1
+	# Curl request failed
+	if [ "${fail}" = "1" ]; then
+		printf "\e[0;31m[FAIL]\e[0m %s %s\n" "${url}" "${errval}"
+
+	# Curl request succeeded
 	else
-		printf "\e[0;32m[OK]\e[0m  %s\n" "${url}"
+		line="$( echo "${header}" | grep -E '^HTTP/(1|2)' )"
+		stat="$( echo "${line}" | awk '{print $2}' )"
+
+		if [ "${stat}" != "200" ]; then
+			printf "\e[0;31m[ERR]\e[0m  %s %s\n" "${url}" "${line}"
+			RETURN=1
+		else
+			printf "\e[0;32m[OK]\e[0m   %s\n" "${url}"
+		fi
 	fi
 done