xbps-src: added new helper script to return dependency list.

xbps-src/libexec/Makefile

@@ -1,6 +1,6 @@
 include ../vars.mk
 
-SH_BINS = xbps-src-chroot-helper xbps-src-doinst-helper
+SH_BINS = xbps-src-chroot-helper xbps-src-doinst-helper xbps-src-getdeps-helper
 MOUNT_BIN = xbps-src-chroot-capmount
 UMOUNT_BIN = xbps-src-chroot-capumount
 CHROOT_BIN = xbps-src-capchroot

xbps-src/libexec/xbps-src-getdeps-helper.sh.in

@@ -0,0 +1,24 @@
+#!/bin/sh
+
+set -e
+
+. @@XBPS_INSTALL_ETCDIR@@/xbps-src.conf
+. @@XBPS_INSTALL_SHAREDIR@@/shutils/init_funcs.sh
+
+set_defvars
+
+. $XBPS_SHUTILSDIR/tmpl_funcs.sh
+. $XBPS_SHUTILSDIR/common_funcs.sh
+
+[ $# -ne 2 ] && echo "usage: $(basename $0) <run|build> <pkgname>" && exit 1
+
+setup_subpkg_tmpl $2
+if [ "$1" = "run" ]; then
+	[ -n "$run_depends" ] && echo "$run_depends"
+elif [ "$1" = "build" ]; then
+	[ -n "$build_depends" ] && echo "$build_depends"
+else
+	usage
+fi
+
+exit 0