From f558aafc781927f2656c1f8b1ba25053acf341df Mon Sep 17 00:00:00 2001
From: Leonid Plyushch <leonid.plyushch@gmail.com>
Date: Sat, 10 Aug 2019 20:22:30 +0300
Subject: [PATCH] coreutils: disallow on-device build

It can delete utility 'ln' in the process of installation:

 make  install-exec-hook
 make[4]: Entering directory '/data/data/com.termux/files/home/.termux-build/coreutils/build'
 /bin/sh: 12: ln: not found
---
 packages/coreutils/build.sh | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/packages/coreutils/build.sh b/packages/coreutils/build.sh
index 90ea0dcbe..04c54c293 100644
--- a/packages/coreutils/build.sh
+++ b/packages/coreutils/build.sh
@@ -27,4 +27,10 @@ ac_cv_func_getpass=yes
 termux_step_pre_configure() {
 	CPPFLAGS+=" -DDEFAULT_TMPDIR=\\\"$TERMUX_PREFIX/tmp\\\""
 	CPPFLAGS+=" -D__USE_FORTIFY_LEVEL=0"
+
+	# On device build is unsupported as it removes utility 'ln' (and maybe
+	# something else) in the installation process.
+	if [ -n "$TERMUX_ON_DEVICE_BUILD" ]; then
+		termux_error_exit "Package '$TERMUX_PKG_NAME' is not safe for on-device builds."
+	fi
 }