do_cmake.sh: simple cmake helper

Signed-off-by: Sage Weil <sage@redhat.com>

diff --git a/do_cmake.sh b/do_cmake.sh
new file mode 100755 (executable)
index 0000000..5f9e73a
--- /dev/null
+++ b/do_cmake.sh
@@ -0,0 +1,9 @@
+#!/bin/sh -x
+git submodule update --init --recursive
+if test -e build; then
+    echo 'build dir already exists; rm -rf build and re-run'
+    exit 1
+fi
+mkdir build
+cd build
+cmake $@ ..