"AM" 9.8.1 - add support for SteamOS (#1688)

* Update APP-MANAGER: use AppMan Mode on SteamDeck SteamOS by default

* Update INSTALL:
 - add version and determine $PATH compatibility
- allow the use of a different "AM_BRANCH"
- fix DATADIR usage

fix #1687

Author: ivan-hc

APP-MANAGER

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-AMVERSION="9.8-1"
+AMVERSION="9.8.1"
 
 # Determine main repository and branch
 AMREPO="https://raw.githubusercontent.com/ivan-hc/AM/main"
@@ -832,13 +832,14 @@ _use_appman() {
 		echo "$DIVIDING_LINE"
 	else
 		[ ! -f "$APPMANCONFIG"/appman-mode ] && mkdir -p "$APPMANCONFIG" && touch "$APPMANCONFIG"/appman-mode
-		_appman && printf "%b\n" "$APPMAN_MSG"
+		_appman && [ -z "$IMMUTABLE_ON" ] && printf "%b\n" "$APPMAN_MSG"
 	fi
 }
 
 if [ "$AMCLI" = am ]; then
+	uname -a | grep -qi "Linux deck \|Linux steamdeck " && IMMUTABLE_ON="1" && [ ! -f "$APPMANCONFIG"/appman-mode ] && mkdir -p "$APPMANCONFIG" && touch "$APPMANCONFIG"/appman-mode
 	if [ -f "$APPMANCONFIG"/appman-mode ]; then
-		[ ! -f "$APPMANCONFIG"/appman-config ] && printf "%b\n" "$APPMAN_MSG"
+		[ ! -f "$APPMANCONFIG"/appman-config ] && [ -z "$IMMUTABLE_ON" ] && printf "%b\n" "$APPMAN_MSG"
 		_appman
 		AMCLIPATH="$CLI_PATH"
 	elif [ ! -w "$AMPATH" ]; then
@@ -1394,7 +1395,7 @@ case "$1" in
 		MODULE="install.am"
 		_online_check
 		_check_fedora_mess
-		[ "$CLI" = am ] && [ -f "$APPMANCONFIG"/appman-mode ] && printf "%b\n" "$APPMAN_MSG"
+		[ "$CLI" = am ] && [ -f "$APPMANCONFIG"/appman-mode ] && [ -z "$IMMUTABLE_ON" ] && printf "%b\n" "$APPMAN_MSG"
 		_use_module "$@"
 		;;
 	'sandbox'|'--sandbox'|'--disable-sandbox')
@@ -1480,7 +1481,7 @@ case "$1" in
 		################################################################################################################################################################
 
 		_use_help() {
-			[ "$CLI" = am ] && [ -f "$APPMANCONFIG"/appman-mode ] && printf "%b\n" "$APPMAN_MSG"
+			[ "$CLI" = am ] && [ -f "$APPMANCONFIG"/appman-mode ] && [ -z "$IMMUTABLE_ON" ] && printf "%b\n" "$APPMAN_MSG"
 			echo -e $"
 			NAME: ${Green}$AMCLIUPPER\033[0m		VERSION: ${Green}$AMVERSION\033[0m
 

INSTALL

@@ -1,10 +1,15 @@
 #!/bin/sh
+################################################################################################################################################################
+#
+#				"AM" INSTALL, version 20250702
+#
+################################################################################################################################################################
 
 # Colors
 RED='\033[0;31m'; LightBlue='\033[1;34m'; Green='\033[0;32m'
 
 # For developers
-AM_BRANCH="main"
+[ -z "$AM_BRANCH" ] && AM_BRANCH="main"
 
 # Check dependencies for this script
 _check_dependency() {
@@ -36,13 +41,19 @@ _prepare_am_directory() {
 	printf '%s\n' 'rm -R -f /opt/am' >> /opt/am/remove
 	chmod a+x /opt/am/remove || exit 1
 
-	# DOWNLOAD AND LINK THE MAIN SCRIPT
+	# DOWNLOAD THE MAIN SCRIPT
 	if ! wget -q "https://raw.githubusercontent.com/ivan-hc/AM/$AM_BRANCH/APP-MANAGER"; then
 		echo "💀 ERROR: Cannot download am"
 		exit 1
 	fi
 	chmod a+x /opt/am/APP-MANAGER
-	ln -fs /opt/am/APP-MANAGER /usr/local/bin/am 2> /dev/null || printf "${RED}WARNING: Couldn't link am to \"/usr/local/bin/am\"!\033[0m\n"
+	# LINK THE MAIN SCRIPT IN $PATH
+	if uname -a | grep -qi "Linux deck \|Linux steamdeck "; then
+		[ -d "/home/${SUDO_USER:-$DOAS_USER}" ] && BINDIR="/home/${SUDO_USER:-$DOAS_USER}/.local/bin" || BINDIR=""
+		[ -n "$BINDIR" ] && mkdir -p "$BINDIR" && ln -fs /opt/am/APP-MANAGER "$BINDIR"/am 2>/dev/null && sed -i "s#/usr/local/bin#$BINDIR#g" /opt/am/remove
+	else
+		ln -fs /opt/am/APP-MANAGER /usr/local/bin/am 2>/dev/null || printf "${RED}WARNING: Couldn't link am to \"/usr/local/bin/am\"!\033[0m\n"
+	fi
 }
 
 _download_am_modules() {