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-rwxr-xr-xmorphlib/exts/sysroot.check30
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diff --git a/morphlib/exts/sysroot.check b/morphlib/exts/sysroot.check
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+#!/bin/sh
+# Copyright (C) 2015 Codethink Limited
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+# Preparatory checks for Morph 'sysroot' write extension
+
+set -eu
+
+location="$1"
+if [ -d "$location" ]; then
+ echo >&2 "ERROR: Deployment directory already exists: $location"
+ exit 1
+fi
+
+if [ "$UPGRADE" == "yes" ]; then
+ echo >&2 "ERROR: Cannot upgrade a sysroot deployment"
+ exit 1
+fi