changed(scripts|main/termux-tools): Use TERMUX_APP_PACKAGE_MANAGER instead of TERMUX_MAIN_PACKAGE_FORMAT

Make changes as per new design implemented in termux/termux-app@b950efec and termux/termux-app#2740

The package build and termux-tools scripts use current package manager for custom logic. The `termux-tools/termux-setup-package-manager` script has been added that will now be used to provide backward compatibility for termux-app `< 0.119.0` (when its released) and validate the package manager. It will also ensure the variable in not unset to prevent `unbound variable` errors if `set -u` is being used by calling scripts.

Closes #10782

Author: agnostic-apollo

scripts/login

@@ -23,8 +23,14 @@ else
 	done
 fi
 
-# for the correct operation of scripts that work with the package manager
-export TERMUX_MAIN_PACKAGE_FORMAT="@TERMUX_PACKAGE_FORMAT@"
+# TERMUX_APP_PACKAGE_MANAGER should be exported by termux-app v0.119.0+ itself
+if [ -z "${TERMUX_APP_PACKAGE_MANAGER-}" ]; then
+	if { [ -n "$(command -v dpkg)" ] && dpkg --compare-versions "$TERMUX_VERSION" lt 0.119.0; } ||   # apt
+		{ [ -n "$(command -v vercmp)" ] && [ "$(vercmp "$TERMUX_VERSION" 0.119.0)" = "-1" ]; }; then # pacman
+		# For the correct operation of scripts that work with the package manager
+		export TERMUX_MAIN_PACKAGE_FORMAT="@TERMUX_PACKAGE_FORMAT@"
+	fi
+fi
 
 if [ -f @TERMUX_PREFIX@/lib/libtermux-exec.so ]; then
 	export LD_PRELOAD=@TERMUX_PREFIX@/lib/libtermux-exec.so

scripts/pkg

@@ -2,16 +2,19 @@
 set -eu
 
 declare -A commands_pkg=(
-["debian"]="dpkg -L|apt show|select_mirror; update_apt_cache; apt install|apt autoclean|apt clean|apt list|apt list --installed|apt install --reinstall|select_mirror; update_apt_cache; apt search|apt remove|select_mirror; apt update; apt full-upgrade"
+["apt"]="dpkg -L|apt show|select_mirror; update_apt_cache; apt install|apt autoclean|apt clean|apt list|apt list --installed|apt install --reinstall|select_mirror; update_apt_cache; apt search|apt remove|select_mirror; apt update; apt full-upgrade"
 ["pacman"]="pacman -Ql|pacman -Qi|pacman -Sy --needed|pacman -Sc|pacman -Scc|pacman -Sl|pacman -Q|pacman -S|pacman -Sys|pacman -Rcns|pacman -Syu"
 )
 
+# Setup TERMUX_APP_PACKAGE_MANAGER
+source "@TERMUX_PREFIX@/bin/termux-setup-package-manager" || exit 1
+
 show_help() {
 	local cache_size
 	local cache_dir=""
-	if [ "$TERMUX_MAIN_PACKAGE_FORMAT" = "debian" ]; then
+	if [ "$TERMUX_APP_PACKAGE_MANAGER" = "apt" ]; then
 		cache_dir="@TERMUX_CACHE_DIR@/apt/archives"
-	elif [ "$TERMUX_MAIN_PACKAGE_FORMAT" = "pacman" ]; then
+	elif [ "$TERMUX_APP_PACKAGE_MANAGER" = "pacman" ]; then
 		cache_dir="@TERMUX_PREFIX@/var/cache/pacman/pkg"
 	fi
 	cache_size=$(du -sh "$cache_dir" 2>/dev/null | cut -f1)
@@ -194,9 +197,9 @@ if [ $# = 0 ]; then
 	show_help
 fi
 
-case "$TERMUX_MAIN_PACKAGE_FORMAT" in
-	debian|pacman) IFS="|" pkg_cmd=(${commands_pkg["$TERMUX_MAIN_PACKAGE_FORMAT"]});;
-	*) echo "Error: pkg is not supported with '$TERMUX_MAIN_PACKAGE_FORMAT' package manager format"; exit 1;;
+case "${TERMUX_APP_PACKAGE_MANAGER-}" in
+	apt|pacman) IFS="|" pkg_cmd=(${commands_pkg["$TERMUX_APP_PACKAGE_MANAGER"]});;
+	*) echo "Error: pkg is not supported with '${TERMUX_APP_PACKAGE_MANAGER-}' package manager"; exit 1;;
 esac
 
 CMD="$1"

scripts/termux-info

@@ -12,12 +12,12 @@ updates() {
 	if [ "$(id -u)" = "0" ]; then
 		echo "Running as root. Cannot check package updates."
 	else
-		if [ "$TERMUX_MAIN_PACKAGE_FORMAT" = "pacman" ]; then
-			pacman -Sy >/dev/null 2>&1
-			updatable=$(pacman -Qu)
-		else
+		if [ "$TERMUX_APP_PACKAGE_MANAGER" = "apt" ]; then
 			apt update >/dev/null 2>&1
 			updatable=$(apt list --upgradable 2>/dev/null | tail -n +2)
+		elif [ "$TERMUX_APP_PACKAGE_MANAGER" = "pacman" ]; then
+			pacman -Sy >/dev/null 2>&1
+			updatable=$(pacman -Qu)
 		fi
 
 		if [ -z "$updatable" ];then
@@ -69,6 +69,9 @@ repo_subscriptions_pacman() {
 	fi
 }
 
+# Setup TERMUX_APP_PACKAGE_MANAGER
+source "@TERMUX_PREFIX@/bin/termux-setup-package-manager" || exit 1
+
 output=""
 
 if [ -n "$TERMUX_VERSION" ]; then
@@ -84,18 +87,18 @@ fi
 
 output+="Packages CPU architecture:
 $(
-	if [ "$TERMUX_MAIN_PACKAGE_FORMAT" = "pacman" ]; then
-		pacman-conf | grep Architecture | sed 's/Architecture = //g'
-	else
+	if [ "$TERMUX_APP_PACKAGE_MANAGER" = "apt" ]; then
 		dpkg --print-architecture
+	elif [ "$TERMUX_APP_PACKAGE_MANAGER" = "pacman" ]; then
+		pacman-conf | grep Architecture | sed 's/Architecture = //g'
 	fi
 )
 Subscribed repositories:
 $(
-	if [ "$TERMUX_MAIN_PACKAGE_FORMAT" = "pacman" ]; then
-		repo_subscriptions_pacman
-	else
+	if [ "$TERMUX_APP_PACKAGE_MANAGER" = "apt" ]; then
 		repo_subscriptions_apt
+	elif [ "$TERMUX_APP_PACKAGE_MANAGER" = "pacman" ]; then
+		repo_subscriptions_pacman
 	fi
 )
 Updatable packages:

scripts/termux-setup-package-manager

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+# TERMUX_APP_PACKAGE_MANAGER should be exported by termux-app v0.119.0+
+# itself and should contain "apt" or "pacman".
+# TERMUX_MAIN_PACKAGE_FORMAT should be exported by login script in
+# termux-tools v0.161+ if termux-app version is less than 0.119.0 and
+# should contain "debian" or "pacman".
+if [ -z "${TERMUX_APP_PACKAGE_MANAGER-}" ]; then
+	if [ -n "${TERMUX_MAIN_PACKAGE_FORMAT-}" ]; then
+		TERMUX_APP_PACKAGE_MANAGER="$([ "${TERMUX_MAIN_PACKAGE_FORMAT-}" = "debian" ] && echo "apt" || echo "${TERMUX_MAIN_PACKAGE_FORMAT-}")"
+	else
+		TERMUX_APP_PACKAGE_MANAGER="@TERMUX_PACKAGE_MANAGER@"
+	fi
+fi
+
+case "${TERMUX_APP_PACKAGE_MANAGER-}" in
+	apt|pacman) :;;
+	*) echo "Unsupported package manager \"${TERMUX_APP_PACKAGE_MANAGER-}\". Only 'apt' and 'pacman' managers are supported" 1>&2; exit 1;;
+esac
+export TERMUX_APP_PACKAGE_MANAGER