backups: move backup code to separate file

Also some major cleanups: Reduce some more code duplication
(verify_hmac, simplify backup_restore_prepare). Rename
backup_dir/backup_tmpdir variables to better match its purpose. Rename
backup_do_copy back to backup_do.  Require QubesVm object (instead of VM
name) as appvm param.

qvm-tools/qvm-backup

@@ -22,7 +22,8 @@
 
 from qubes.qubes import QubesVmCollection
 from qubes.qubes import QubesException
-from qubes.qubesutils import backup_prepare, backup_do_copy, size_to_human
+from qubes.backup import backup_prepare, backup_do
+from qubes.qubesutils import size_to_human
 from optparse import OptionParser
 import os
 import sys
@@ -80,6 +81,8 @@ def main():
             files_to_backup, 0)
 
     if not options.appvm:
+        appvm = None
+
         stat = os.statvfs(base_backup_dir)
         backup_fs_free_sz = stat.f_bsize * stat.f_bavail
         print
@@ -88,6 +91,11 @@ def main():
             exit(1)
 
         print "-> Available space: {0}".format(size_to_human(backup_fs_free_sz))
+    else:
+        appvm = qvm_collection.get_vm_by_name(options.appvm)
+        if appvm is None:
+            print >>sys.stderr, "ERROR: VM {0} does not exist".format(options.appvm)
+            exit(1)
 
     prompt = raw_input ("Do you want to proceed? [y/N] ")
     if not (prompt == "y" or prompt == "Y"):
@@ -96,10 +104,10 @@ def main():
     passphrase = getpass.getpass("Please enter the pass phrase that will be used to encrypt/verify the backup: ")
 
     try:
-        backup_do_copy(base_backup_dir, files_to_backup, passphrase,
+        backup_do(base_backup_dir, files_to_backup, passphrase,
                 progress_callback=print_progress,
                 encrypt=options.encrypt,
-                appvm=options.appvm)
+                appvm=appvm)
     except QubesException as e:
         print >>sys.stderr, "ERROR: %s" % str(e)
         exit(1)

qvm-tools/qvm-backup-restore

@@ -22,10 +22,10 @@
 
 from qubes.qubes import QubesVmCollection
 from qubes.qubes import QubesException
-from qubes.qubesutils import backup_restore_header
+from qubes.backup import backup_restore_header
-from qubes.qubesutils import backup_restore_prepare 
+from qubes.backup import backup_restore_prepare
-from qubes.qubesutils import backup_restore_print_summary
+from qubes.backup import backup_restore_print_summary
-from qubes.qubesutils import backup_restore_do
+from qubes.backup import backup_restore_do
 from optparse import OptionParser
 
 import os
@@ -95,15 +95,28 @@ def main():
     if options.exclude:
         restore_options['exclude'] = options.exclude
 
+    appvm = None
+    if options.appvm is not None:
+        appvm = qvm_collection.get_vm_by_name(options.appvm)
+        if appvm is None:
+            print >>sys.stderr, "ERROR: VM {0} does not exist".format(options.appvm)
+            exit(1)
 
     passphrase = getpass.getpass("Please enter the pass phrase that will be used to decrypt/verify the backup: ")
 
     print >> sys.stderr, "Checking backup content..."
-    restore_tmpdir,qubes_xml = backup_restore_header(backup_dir, passphrase, options.decrypt, appvm=options.appvm)
+    restore_tmpdir,qubes_xml = backup_restore_header(backup_dir, passphrase, encrypted=options.decrypt, appvm=options.appvm)
 
     restore_info = None
     try:
-        restore_info = backup_restore_prepare(backup_dir,os.path.join(restore_tmpdir, qubes_xml), passphrase, options=restore_options, host_collection=host_collection, encrypt=options.decrypt, appvm=options.appvm)
+        restore_info = backup_restore_prepare(
+                backup_dir,
+                os.path.join(restore_tmpdir, qubes_xml),
+                passphrase,
+                options=restore_options,
+                host_collection=host_collection,
+                encrypt=options.decrypt,
+                appvm=appvm)
     except QubesException as e:
         print >> sys.stderr, "ERROR: %s" % str(e)
         exit(1)
@@ -192,7 +205,13 @@ def main():
         exit (0)
 
 
-    backup_restore_do(backup_dir,restore_tmpdir, passphrase, restore_info, host_collection=host_collection, encrypted=options.decrypt, appvm=options.appvm)
+    backup_restore_do(backup_dir,
+            restore_tmpdir,
+            passphrase,
+            restore_info,
+            host_collection=host_collection,
+            encrypted=options.decrypt,
+            appvm=appvm)
 
     host_collection.unlock_db()
 

rpm_spec/core-dom0.spec

@@ -109,6 +109,8 @@ cp core/qubesutils.py $RPM_BUILD_ROOT%{python_sitearch}/qubes
 cp core/qubesutils.py[co] $RPM_BUILD_ROOT%{python_sitearch}/qubes
 cp core/guihelpers.py $RPM_BUILD_ROOT%{python_sitearch}/qubes
 cp core/guihelpers.py[co] $RPM_BUILD_ROOT%{python_sitearch}/qubes
+cp core/backup.py $RPM_BUILD_ROOT%{python_sitearch}/qubes
+cp core/backup.py[co] $RPM_BUILD_ROOT%{python_sitearch}/qubes
 cp core/__init__.py $RPM_BUILD_ROOT%{python_sitearch}/qubes
 cp core/__init__.py[co] $RPM_BUILD_ROOT%{python_sitearch}/qubes
 cp qmemman/qmemman*py $RPM_BUILD_ROOT%{python_sitearch}/qubes
@@ -272,6 +274,9 @@ fi
 %{python_sitearch}/qubes/guihelpers.py
 %{python_sitearch}/qubes/guihelpers.pyc
 %{python_sitearch}/qubes/guihelpers.pyo
+%{python_sitearch}/qubes/backup.py
+%{python_sitearch}/qubes/backup.pyc
+%{python_sitearch}/qubes/backup.pyo
 %{python_sitearch}/qubes/__init__.py
 %{python_sitearch}/qubes/__init__.pyc
 %{python_sitearch}/qubes/__init__.pyo