Code cleanup and refactoring

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

diff --git a/image_creator/dialog_util.py b/image_creator/dialog_util.py
new file mode 100644 (file)
index 0000000..3039473
--- /dev/null
+++ b/image_creator/dialog_util.py
@@ -0,0 +1,153 @@
+#!/usr/bin/env python
+
+# Copyright 2012 GRNET S.A. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or
+# without modification, are permitted provided that the following
+# conditions are met:
+#
+#   1. Redistributions of source code must retain the above
+#      copyright notice, this list of conditions and the following
+#      disclaimer.
+#
+#   2. Redistributions in binary form must reproduce the above
+#      copyright notice, this list of conditions and the following
+#      disclaimer in the documentation and/or other materials
+#      provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
+# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
+# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+# The views and conclusions contained in the software and
+# documentation are those of the authors and should not be
+# interpreted as representing official policies, either expressed
+# or implied, of GRNET S.A.
+
+import os
+
+SMALL_WIDTH = 60
+WIDTH = 70
+
+
+def update_background_title(session):
+    d = session['dialog']
+    dev = session['device']
+
+    MB = 2 ** 20
+
+    size = (dev.size + MB - 1) // MB
+    shrinked = 'shrinked' in session and session['shrinked']
+    postfix = " (shrinked)" if shrinked else ''
+
+    title = "OS: %s, Distro: %s, Size: %dMB%s" % \
+            (dev.ostype, dev.distro, size, postfix)
+
+    d.setBackgroundTitle(title)
+
+
+def confirm_exit(d, msg=''):
+    return not d.yesno("%s Do you want to exit?" % msg, width=SMALL_WIDTH)
+
+
+def confirm_reset(d):
+    return not d.yesno("Are you sure you want to reset everything?",
+                       width=SMALL_WIDTH, defaultno=1)
+
+
+class Reset(Exception):
+    pass
+
+
+def extract_image(session):
+    d = session['dialog']
+    dir = os.getcwd()
+    while 1:
+        if dir and dir[-1] != os.sep:
+            dir = dir + os.sep
+
+        (code, path) = d.fselect(dir, 10, 50, title="Save image as...")
+        if code in (d.DIALOG_CANCEL, d.DIALOG_ESC):
+            return False
+
+        if os.path.isdir(path):
+            dir = path
+            continue
+
+        if os.path.isdir("%s.meta" % path):
+            d.msgbox("Can't overwrite directory `%s.meta'" % path,
+                     width=SMALL_WIDTH)
+            continue
+
+        if os.path.isdir("%s.md5sum" % path):
+            d.msgbox("Can't overwrite directory `%s.md5sum'" % path,
+                     width=SMALL_WIDTH)
+            continue
+
+        basedir = os.path.dirname(path)
+        name = os.path.basename(path)
+        if not os.path.exists(basedir):
+            d.msgbox("Directory `%s' does not exist" % basedir,
+                     width=SMALL_WIDTH)
+            continue
+
+        dir = basedir
+        if len(name) == 0:
+            continue
+
+        files = ["%s%s" % (path, ext) for ext in ('', '.meta', '.md5sum')]
+        overwrite = filter(os.path.exists, files)
+
+        if len(overwrite) > 0:
+            if d.yesno("The following file(s) exist:\n"
+                       "%s\nDo you want to overwrite them?" %
+                       "\n".join(overwrite), width=SMALL_WIDTH):
+                continue
+
+        gauge = GaugeOutput(d, "Image Extraction", "Extracting image...")
+        try:
+            dev = session['device']
+            out = dev.out
+            out.add(gauge)
+            try:
+                if "checksum" not in session:
+                    size = dev.size
+                    md5 = MD5(out)
+                    session['checksum'] = md5.compute(session['snapshot'],
+                                                      size)
+
+                # Extract image file
+                dev.dump(path)
+
+                # Extract metadata file
+                out.output("Extracting metadata file...")
+                with open('%s.meta' % path, 'w') as f:
+                    f.write(extract_metadata_string(session))
+                out.success('done')
+
+                # Extract md5sum file
+                out.output("Extracting md5sum file...")
+                md5str = "%s %s\n" % (session['checksum'], name)
+                with open('%s.md5sum' % path, 'w') as f:
+                    f.write(md5str)
+                out.success("done")
+            finally:
+                out.remove(gauge)
+        finally:
+            gauge.cleanup()
+        d.msgbox("Image file `%s' was successfully extracted!" % path,
+                 width=SMALL_WIDTH)
+        break
+
+    return True
+
+# vim: set sta sts=4 shiftwidth=4 sw=4 et ai :