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Old 07-10-2008, 01:48 PM
 
Default virt-convert: add format detection

# HG changeset patch
# User john.levon@sun.com
# Date 1215697570 25200
# Node ID 91d463e8e9921844271a90f416e0e6d94fd2af40
# Parent f5e35abf05eb1fa3b64af2cf2cdcfc26139025fd
virt-convert: add format detection

Add format detection, along with detection for VMX

Signed-off-by: John Levon <john.levon@sun.com>

diff --git a/virt-convert b/virt-convert
--- a/virt-convert
+++ b/virt-convert
@@ -1,9 +1,10 @@
#!/usr/bin/python
-#
-# Convert a VMware(tm) virtual machine into an XML image description
#
# Copyright 2008 Red Hat, Inc.
# Joey Boggs <jboggs@redhat.com>
+#
+# Copyright 2008 Sun Microsystems, Inc. All rights reserved.
+# Use is subject to license terms.
#
# 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
@@ -49,8 +50,7 @@
opts.add_option("-d", "--debug", action="store_true", dest="debug",
help=("Print debugging information"))
opts.add_option("-i", "--input-format", action="store",
- dest="input_format", default="vmx",
- help=("Input format, e.g. 'vmx'"))
+ dest="input_format", help=("Input format, e.g. 'vmx'"))
opts.add_option("-o", "--output-format", action="store",
dest="output_format", default="virt-image",
help=("Output format, e.g. 'virt-image'"))
@@ -71,35 +71,45 @@
options.disk_format not in diskcfg.disk_formats()):
opts.error("Unknown output disk format "%s"" % options.disk_format)

- # hard-code for now
- if options.input_format != "vmx":
- opts.error(("Unsupported input format "%s"" % options.input_format))
- if options.output_format != "virt-image":
- opts.error(("Unsupported output format "%s""
- % options.output_format))
- if os.path.isdir(args[0]):
- vmx_files = [x for x in os.listdir(args[0]) if x.endswith(".vmx") ]
- if (len(vmx_files)) == 0:
- opts.error(("No VM definition file was found in %s" % args[0]))
- if (len(vmx_files)) > 1:
- opts.error(("Too many .vmx definitions found in %s" % args[0]))
- options.input_file = os.path.join(args[0], vmx_files[0])
- options.input_dir = args[0]
- else:
- options.input_file = args[0]
- options.input_dir = os.path.dirname(os.path.realpath(args[0]))
-
if len(args) == 1:
options.output_file = None
options.output_dir = None
if os.path.isdir(args[0]):
- options.output_dir = options.input_dir
+ options.output_dir = args[0]
elif os.path.isdir(args[1]) or args[1].endswith("/"):
options.output_file = None
options.output_dir = args[1]
else:
options.output_file = args[1]
options.output_dir = os.path.dirname(os.path.realpath(args[1]))
+
+ if options.output_format not in formats.formats():
+ opts.error(("Unknown output format "%s"" % options.output_format))
+ if options.output_format not in formats.output_formats():
+ opts.error(("No output handler for format "%s""
+ % options.output_format))
+
+ if not options.input_format:
+ try:
+ (args[0], options.input_format) = formats.find_input(args[0])
+ except StandardError, e:
+ opts.error("Couldn't determine input format for "%s": %s" %
+ (args[0], e.message))
+ sys.exit(1)
+
+ if options.input_format not in formats.formats():
+ opts.error(("Unknown input format "%s"" % options.input_format))
+ if options.input_format not in formats.input_formats():
+ opts.error(("No input handler for format "%s""
+ % options.input_format))
+
+ if os.path.isdir(args[0]):
+ (options.input_file, _) = formats.find_input(args[0],
+ options.input_format)
+ options.input_dir = args[0]
+ else:
+ options.input_file = args[0]
+ options.input_dir = os.path.dirname(os.path.realpath(args[0]))

return options

@@ -134,19 +144,8 @@
options = parse_args()
cli.setupLogging("virt-convert", options.debug)

- try:
- inp = formats.find_parser_by_name(options.input_format)
- except:
- logging.error("No parser of format "%s" was found." %
- options.input_format)
- sys.exit(1)
-
- try:
- outp = formats.find_parser_by_name(options.output_format)
- except:
- logging.error("No parser of format "%s" was found." %
- options.output_format)
- sys.exit(1)
+ inp = formats.parser_by_name(options.input_format)
+ outp = formats.parser_by_name(options.output_format)

vmdef = None

diff --git a/virtconv/formats.py b/virtconv/formats.py
--- a/virtconv/formats.py
+++ b/virtconv/formats.py
@@ -17,6 +17,8 @@
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301 USA.
#
+
+import os

_parsers = [ ]

@@ -66,11 +68,13 @@
global _parsers
_parsers += [ parser ]

-def find_parser_by_name(name):
+def parser_by_name(name):
"""
- Return the parser of the given name
+ Return the parser of the given name.
"""
- return [p for p in _parsers if p.name == name][0] or None
+ parsers = [p for p in _parsers if p.name == name]
+ if len(parsers):
+ return parsers[0]

def find_parser_by_file(input_file):
"""
@@ -80,3 +84,46 @@
if p.identify_file(input_file):
return p
return None
+
+def formats():
+ """
+ Return a list of supported formats.
+ """
+ return [p.name for p in _parsers]
+
+def input_formats():
+ """
+ Return a list of supported input formats.
+ """
+ return [p.name for p in _parsers if p.can_import]
+
+def output_formats():
+ """
+ Return a list of supported output formats.
+ """
+ return [p.name for p in _parsers if p.can_export]
+
+def find_input(path, format = None):
+ """
+ Search for a configuration file automatically. If @format is given,
+ then only search using a matching format parser.
+ """
+
+ if os.path.isdir(path):
+ files = os.listdir(path)
+
+ for p in _parsers:
+ if not p.can_identify:
+ continue
+ if format and format != p.name:
+ continue
+
+ if os.path.isfile(path):
+ if p.identify_file(path):
+ return (path, p.name)
+ elif os.path.isdir(path):
+ for cfgfile in [ x for x in files if x.endswith(p.suffix) ]:
+ if p.identify_file(os.path.join(path, cfgfile)):
+ return (os.path.join(path, cfgfile), p.name)
+
+ raise StandardError("unknown format")
diff --git a/virtconv/parsers/virtimage.py b/virtconv/parsers/virtimage.py
--- a/virtconv/parsers/virtimage.py
+++ b/virtconv/parsers/virtimage.py
@@ -81,6 +81,9 @@
"""
name = "virt-image"
suffix = ".virt-image.xml"
+ can_import = False
+ can_export = True
+ can_identify = False

@staticmethod
def identify_file(input_file):
diff --git a/virtconv/parsers/vmx.py b/virtconv/parsers/vmx.py
--- a/virtconv/parsers/vmx.py
+++ b/virtconv/parsers/vmx.py
@@ -22,6 +22,8 @@
import virtconv.vmcfg as vmcfg
import virtconv.diskcfg as diskcfg

+import re
+
class vmx_parser(formats.parser):
"""
Support for VMWare .vmx files. Note that documentation is
@@ -31,13 +33,23 @@

name = "vmx"
suffix = ".vmx"
+ can_import = True
+ can_export = False
+ can_identify = True

@staticmethod
def identify_file(input_file):
"""
Return True if the given file is of this format.
"""
- raise NotImplementedError
+ infile = open(input_file, "r")
+ line = infile.readline()
+ infile.close()
+
+ # some .vmx files don't bother with the header
+ if re.match(r'^config.versions+=', line):
+ return True
+ return re.match(r'^#!s*/usr/bin/vm(ware|player)', line) is not None

@staticmethod
def import_file(input_file):

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