From 4b3bed3c9a6f4bcff75bb6c9391e727b534dc773 Mon Sep 17 00:00:00 2001
From: per1234 <accounts@perglass.com>
Date: Tue, 30 Jun 2020 11:46:35 -0700
Subject: [PATCH] [skip ci] Fix installation script's latest tag determination
 code

GitHub changed the HTML of the release page, which resulted in grep finding multiple instances of the pattern, causing the installation script to fail when no version parameter was provided:

$ curl -fsSL https://raw.githubusercontent.com/arduino/arduino-cli/master/install.sh | sh
Installing in /home/per/temporary/bin
ARCH=64bit
OS=Linux
Using curl as download tool
TAG=0.11.0
0.11.0
0.11.0
CLI_DIST=arduino-cli_0.11.0
0.11.0
0.11.0_Linux_64bit.tar.gz
Downloading https://downloads.arduino.cc/arduino-cli/arduino-cli_0.11.0
0.11.0
0.11.0_Linux_64bit.tar.gz
Failed to install arduino-cli

The chosen fix was to expand the grep pattern to something that should only ever occur once on an HTML page.
---
 install.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/install.sh b/install.sh
index cad8885c6bd..7d3ed301f2b 100755
--- a/install.sh
+++ b/install.sh
@@ -84,9 +84,9 @@ checkLatestVersion() {
 	local regex="[0-9][A-Za-z0-9\.-]*"
 	local latest_url="https://github.com/arduino/arduino-cli/releases/latest"
 	if [ "$DOWNLOAD_TOOL" = "curl" ]; then
-		tag=$(curl -SsL $latest_url | grep -o "Release $regex · arduino/arduino-cli" | grep -o "$regex")
+		tag=$(curl -SsL $latest_url | grep -o "<title>Release $regex · arduino/arduino-cli" | grep -o "$regex")
 	elif [ "$DOWNLOAD_TOOL" = "wget" ]; then
-		tag=$(wget -q -O - $latest_url | grep -o "Release $regex · arduino/arduino-cli" | grep -o "$regex")
+		tag=$(wget -q -O - $latest_url | grep -o "<title>Release $regex · arduino/arduino-cli" | grep -o "$regex")
 	fi
 	if [ "x$tag" = "x" ]; then
 		echo "Cannot determine latest tag."