Add spack md5 command for simple checksumming.

lib/spack/spack/cmd/md5.py

@@ -0,0 +1,52 @@
+##############################################################################
+# Copyright (c) 2013-2014, Lawrence Livermore National Security, LLC.
+# Produced at the Lawrence Livermore National Laboratory.
+#
+# This file is part of Spack.
+# Written by Todd Gamblin, tgamblin@llnl.gov, All rights reserved.
+# LLNL-CODE-647188
+#
+# For details, see https://scalability-llnl.github.io/spack
+# Please also see the LICENSE file for our notice and the LGPL.
+#
+# 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 2.1 dated February 1999.
+#
+# 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 terms and
+# conditions of the GNU General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with this program; if not, write to the Free Software Foundation,
+# Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+##############################################################################
+import os
+import hashlib
+from external import argparse
+
+import llnl.util.tty as tty
+from llnl.util.filesystem import *
+
+import spack.util.crypto
+
+description = "Calculate md5 checksums for files."
+
+def setup_parser(subparser):
+    setup_parser.parser = subparser
+    subparser.add_argument('files', nargs=argparse.REMAINDER,
+                           help="Files to checksum.")
+
+def md5(parser, args):
+    if not args.files:
+        setup_parser.parser.print_help()
+
+    for f in args.files:
+        if not os.path.isfile(f):
+            tty.die("Not a file: %s" % f)
+        if not can_access(f):
+            tty.die("Cannot read file: %s" % f)
+
+        checksum = spack.util.crypto.checksum(hashlib.md5, f)
+        print "%s  %s" % (checksum, f)