Talisman hook script ignore talisman upgrade based on variable (thoug…

…htworks#211)

* set TALISMAN_UPGRADE_TIMEOUT for upgrade timeout(seconds). Default = 10 secs
* set TALISMAN_SKIP_UPGRADE to true to skip upgrade

README.md

@@ -186,6 +186,11 @@ a real git revision!)
 # Upgrading
 Since release v0.4.4, Talisman <b>automatically updates</b> the binary to the latest release, when the hook is invoked (at pre-commit/pre-push, as set up). So, just sit back, relax, and keep using the latest Talisman without any extra efforts.
 
+The following environment variables can be set:
+
+1. TALISMAN_SKIP_UPGRADE: Set to true if you want to skip the automatic upgrade check. Default is false
+2. TALISMAN_UPGRADE_TIMEOUT: Max timeout before the upgrade is cancelled(in seconds). Default is 10 seconds 
+
 If at all you need to manually upgrade, here are the steps:
 <br>[Recommended] Update Talisman binary and hook scripts to the latest release:
 

global_install_scripts/talisman_hook_script.bash

@@ -46,8 +46,9 @@ talisman_hook_script)
 esac
 
 function check_and_upgrade_talisman_binary() {
-	if [ -n "${TALISMAN_HOME:-}" ]; then
-		LATEST_VERSION=$(curl -Is https://github.com/${ORG_REPO}/releases/latest | grep -E "Location" | grep -o '[^/]\+$' | grep -Eo '[0-9]+\.[0-9]+\.[0-9]+')
+	TALISMAN_UPGRADE_TIMEOUT=${TALISMAN_UPGRADE_TIMEOUT:-10}
+	if [[ -n "${TALISMAN_HOME:-}" && "$TALISMAN_SKIP_UPGRADE" != "true" ]]; then
+		LATEST_VERSION=$(curl -Is --max-time $TALISMAN_UPGRADE_TIMEOUT https://github.com/${ORG_REPO}/releases/latest | grep -E "Location" | grep -o '[^/]\+$' | grep -Eo '[0-9]+\.[0-9]+\.[0-9]+')
 		CURRENT_VERSION=$(${TALISMAN_BINARY} --version | grep -Eo '[0-9]+\.[0-9]+\.[0-9]+')
 		if [ ! -z "$LATEST_VERSION" ] && [ "$LATEST_VERSION" != "$CURRENT_VERSION" ]; then
 			echo ""