selftest: add a test that verifies unlink works when "force user" is set

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14617

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>

source3/script/tests/test_force_user_unlink.sh

@@ -0,0 +1,40 @@
+#!/bin/sh
+#
+# Test unlink on share with "force user"
+#
+# Copyright (C) 2021 Ralph Boehme
+
+incdir=$(dirname $0)/../../../testprogs/blackbox
+. $incdir/subunit.sh
+. $incdir/common_test_fns.inc
+
+smbclient="$BINDIR/smbclient"
+error_inject_conf=$(dirname ${SMB_CONF_PATH})/error_inject.conf
+failed=0
+
+test_forced_user_can_delete() {
+    out=$($smbclient -U $DOMAIN/$USERNAME%$PASSWORD //$SERVER_IP/force_user_error_inject -c "rm dir/file")
+    if [ $? -ne 0 ] ; then
+	echo $out
+	return 1
+    fi
+    tmp=$(echo $out | grep NT_STATUS_ )
+    if [ $? -eq 0 ] ; then
+	return 1
+    fi
+    return 0
+}
+
+echo "error_inject:unlinkat = EACCES" > ${error_inject_conf}
+
+$smbclient -U $DOMAIN/$USERNAME%$PASSWORD //$SERVER_IP/force_user_error_inject -c "mkdir dir" || failed=`expr $failed + 1`
+$smbclient -U $DOMAIN/$USERNAME%$PASSWORD //$SERVER_IP/force_user_error_inject -c "put WHATSNEW.txt dir/file" || failed=`expr $failed + 1`
+
+testit "test_forced_user_can_delete" test_forced_user_can_delete || failed=`expr $failed + 1`
+
+rm ${error_inject_conf}
+
+# Clean up after ourselves.
+$smbclient -U $DOMAIN/$USERNAME%$PASSWORD //$SERVER_IP/force_user_error_inject -c "del dir/file; rmdir dir"
+
+testok $0 $failed