Add input options and populate image metadata

[snf-image-creator] / image_creator / main.py

diff --git a/image_creator/main.py b/image_creator/main.py
index c79f1f1..6308a57 100644 (file)
--- a/image_creator/main.py
+++ b/image_creator/main.py
@@ -32,34 +32,102 @@
 # or implied, of GRNET S.A.
 
 from image_creator import get_os_class
+from image_creator import __version__ as version
 from image_creator.disk import Disk
 import sys
 import os
+import optparse
+from pbs import dd
+
+
+class FatalError(Exception):
+    pass
+
+
+def check_writable_dir(option, opt_str, value, parser):
+    if not os.path.isdir(value):
+        raise OptionValueError("%s is not a valid directory name" % value)
+    setattr(parser.values, option.dest, value)
+
+
+def parse_options(input_args):
+    usage = "Usage: %prog [options] <input_media> <name>"
+    parser = optparse.OptionParser(version=version, usage=usage)
+
+    parser.add_option("-o", "--outdir", type="string", dest="outdir",
+        default=".", action="callback", callback=check_writable_dir,
+        help="Output files to DIR [default: working dir]",
+        metavar="DIR")
+
+    parser.add_option("-f", "--force", dest="force", default=False,
+        action="store_true", help="Overwrite output files if they exist")
+
+    parser.add_option("--no-shrink", dest="shrink", default=True,
+        help="Don't shrink any partition before extracting the image",
+        action="store_false")
+
+    options, args = parser.parse_args(input_args)
+
+    if len(args) != 2:
+        parser.error('input media or name are missing')
+    options.source = args[0]
+    options.name = args[1]
+
+    if not os.path.exists(options.source):
+        parser.error('Input media is not accessible')
+
+    return options
+
 
 def main():
-    if len(sys.argv) != 3:
-        sys.exit("Usage: %s <source> <output_file>" %
-                        os.path.basename(sys.argv[0]))
-    source = sys.argv[1]
-    dest = sys.argv[2]
 
-    disk = Disk(source)
+    options = parse_options(sys.argv[1:])
+
+    if os.geteuid() != 0:
+        raise FatalError("You must run %s as root" \
+                        % os.path.basename(sys.argv[0]))
+
+    if not options.force:
+        for ext in ('diskdump', 'meta'):
+            filename = "%s/%s.%s" % (options.outdir, options.name, ext)
+            if os.path.exists(filename):
+                raise FatalError("Output file %s exists "
+                    "(use --force to overwrite it)." % filename)
+
+    disk = Disk(options.source)
     try:
         dev = disk.get_device()
         dev.mount()
         osclass = get_os_class(dev.distro, dev.ostype)
         image_os = osclass(dev.root, dev.g)
         metadata = image_os.get_metadata()
-        for key, val in metadata.iteritems():
-            print "%s=%s" % (key,val)
-
         image_os.data_cleanup()
+        dev.umount()
+        size = options.shrink and dev.shrink() or dev.size()
+        metadata['size'] = str(size // 2 ** 20)
 
+        dd('if=%s' % dev.device,
+            'of=%s/%s.%s' % (options.outdir, options.name, 'diskdump'),
+            'bs=4M', 'count=%d' % ((size + 1) // 2 ** 22))
+
+        f = open('%s/%s.%s' % (options.outdir, options.name, 'meta'), 'w')
+        for key in metadata.keys():
+            f.write("%s=%s\n" % (key, metadata[key]))
+        f.close()
     finally:
         disk.cleanup()
 
+    return 0
+
+COLOR_BLACK = "\033[00m"
+COLOR_RED = "\033[1;31m"
+
 if __name__ == '__main__':
-    main()
+    try:
+        ret = main()
+        sys.exit(ret)
+    except FatalError as e:
+        print >> sys.stderr, "\n%sError: %s%s\n" % (COLOR_RED, e, COLOR_BLACK)
+        sys.exit(1)
 
 # vim: set sta sts=4 shiftwidth=4 sw=4 et ai :
-