enhance(main/termux-tools:termux-change-repo): fail if apt isn't installed

packages/termux-tools/build.sh

@@ -2,7 +2,7 @@ TERMUX_PKG_HOMEPAGE=https://termux.org/
 TERMUX_PKG_DESCRIPTION="Basic system tools for Termux"
 TERMUX_PKG_LICENSE="GPL-3.0"
 TERMUX_PKG_MAINTAINER="@termux"
-TERMUX_PKG_VERSION=0.186
+TERMUX_PKG_VERSION=0.187
 TERMUX_PKG_SKIP_SRC_EXTRACT=true
 TERMUX_PKG_PLATFORM_INDEPENDENT=true
 TERMUX_PKG_ESSENTIAL=true

packages/termux-tools/termux-change-repo

@@ -1,5 +1,8 @@
 #!@TERMUX_PREFIX@/bin/bash
 
+# Setup TERMUX_APP_PACKAGE_MANAGER
+source "@TERMUX_PREFIX@/bin/termux-setup-package-manager" || exit 1
+
 if [ "$1" == "--help" ] || [ "$1" == "-help" ]; then
     echo "Script for redirecting subscribed repositories to mirrors."
     echo "You can choose between mirrors listed at"
@@ -196,6 +199,17 @@ replace_repository() {
     fi
 }
 
+if ! command -v apt 1>/dev/null; then
+    echo "Error: changing mirrors can't execute because apt is not installed."
+    exit 1
+fi
+
+if [ "$TERMUX_APP_PACKAGE_MANAGER" = "pacman" ]; then
+    read -p "Warning: termux-change-repo can only change mirrors for apt, is that what you intended? [y|n] " -n 1 -r
+    echo
+    [[ ${REPLY} =~ ^[Nn]$ ]] && exit
+fi
+
 TEMPFILE="$(mktemp @TERMUX_PREFIX@/tmp/mirror.XXXXXX)"
 
 REPOSITORIES=()