termux-tools: add login hook for running commands before shell is launched

packages/termux-tools/build.sh

@@ -9,8 +9,11 @@ TERMUX_PKG_ESSENTIAL=true
 TERMUX_PKG_BREAKS="termux-keyring (<< 1.9)"
 TERMUX_PKG_CONFLICTS="procps (<< 3.3.15-2)"
 TERMUX_PKG_SUGGESTS="termux-api"
-TERMUX_PKG_CONFFILES="etc/motd
-etc/motd-playstore"
+TERMUX_PKG_CONFFILES="
+etc/motd
+etc/motd-playstore
+etc/termux-login.sh
+"
 
 # Some of these packages are not dependencies and used only to ensure
 # that core packages are installed after upgrading (we removed busybox
@@ -68,4 +71,10 @@ termux_step_make_install() {
 		cp $TERMUX_PREFIX/share/examples/termux/termux.properties $TERMUX_ANDROID_HOME/.termux/
 	fi
 	EOF
+
+	cat <<- EOF > $TERMUX_PREFIX/etc/termux-login.sh
+	##
+	## This script is sourced by $PREFIX/bin/login before executing shell.
+	##
+	EOF
 }

packages/termux-tools/login

@@ -28,6 +28,10 @@ if [ -f @TERMUX_PREFIX@/lib/libtermux-exec.so ]; then
 	$SHELL -c "coreutils --coreutils-prog=true" > /dev/null 2>&1 || unset LD_PRELOAD
 fi
 
+if [ -f @TERMUX_PREFIX@/etc/termux-login.sh ]; then
+	. @TERMUX_PREFIX@/etc/termux-login.sh
+fi
+
 if [ -n "$TERM" ]; then
 	exec "$SHELL" -l "$@"
 else