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backup: multiple fixes for the backup process, including non-encrypted backups

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- Ensure backup without encryption is working
- Implemented progress feedback through a global variable
- Ask user for a passphrase used for encryption or for verification
This commit is contained in:
Olivier MEDOC 2013-09-10 09:27:51 +02:00
parent 23065f6fa0
commit 361741b8aa
1 changed files with 71 additions and 51 deletions
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122
dom0/qvm-core/qubesutils.py
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@ -1049,6 +1049,8 @@ def backup_do_copy(base_backup_dir, files_to_backup, progress_callback = None, e
# If not APPVM, STDOUT is a local file
backup_stdout = open(backup_target,'wb')
passphrase = raw_input("Please enter the pass phrase that will be used to encrypt/verify the backup:\n")
passphrase = passphrase.replace("\r","").replace("\n","")
blocks_backedup = 0
progress = blocks_backedup * 11 / total_backup_sz
@ -1088,7 +1090,8 @@ def backup_do_copy(base_backup_dir, files_to_backup, progress_callback = None, e
break
print "Sending file",filename
tar_final_cmd = ["tar", "-cO", "-C", self.base_dir, filename]
# This tar used for sending data out need to be as simple, as simple, as featureless as possible. It will not be verified before untaring.
tar_final_cmd = ["tar", "-cO", "--posix", "-C", self.base_dir, filename]
final_proc = subprocess.Popen (tar_final_cmd, stdin=subprocess.PIPE, stdout=self.backup_stdout)
final_proc.wait()
@ -1098,6 +1101,14 @@ def backup_do_copy(base_backup_dir, files_to_backup, progress_callback = None, e
print "Finished sending thread"
global blocks_backedup
blocks_backedup = 0
def compute_progress(new_size, total_backup_sz):
global blocks_backedup
blocks_backedup += new_size
progress = blocks_backedup / float(total_backup_sz)
progress_callback(round(progress*100,2))
to_send = Queue()
send_proc = Send_Worker(to_send, backup_tmpdir, backup_stdout)
send_proc.start()
@ -1113,6 +1124,7 @@ def backup_do_copy(base_backup_dir, files_to_backup, progress_callback = None, e
if not os.path.isdir(os.path.dirname(backup_tempfile)):
os.makedirs(os.path.dirname(backup_tempfile))
# The first tar cmd can use any complex feature as we want. Files will be verified before untaring this.
tar_cmdline = ["tar", "-Pc", "-f", backup_pipe,'--sparse','--tape-length',str(1000000),'-C',qubes_base_dir,
filename["path"].split(os.path.normpath(qubes_base_dir)+"/")[1]
]
@ -1130,19 +1142,25 @@ def backup_do_copy(base_backup_dir, files_to_backup, progress_callback = None, e
running = []
while run_error == "paused":
# Start encrypt
pipe = open(backup_pipe,'rb')
# If no cipher is provided, the data is forwarded unencrypted !!!
encryptor = subprocess.Popen (["openssl", "enc", "-e", "-aes-256-cbc", "-pass", "pass:azerty"], stdin=pipe, stdout=subprocess.PIPE)
# Start HMAC
hmac = subprocess.Popen (["openssl", "dgst", "-hmac", "azerty"], stdin=subprocess.PIPE, stdout=subprocess.PIPE)
hmac = subprocess.Popen (["openssl", "dgst", "-hmac", passphrase], stdin=subprocess.PIPE, stdout=subprocess.PIPE)
# Prepare a first chunk
chunkfile = backup_tempfile + "." + "%03d" % i
i += 1
chunkfile_p = open(chunkfile,'wb')
run_error = wait_backup_feedback(progress_callback, encryptor, chunkfile_p, total_backup_sz, hmac=hmac, vmproc=vmproc, addproc=tar_sparse)
if encrypt:
# Start encrypt
# If no cipher is provided, the data is forwarded unencrypted !!!
# Also note that the
encryptor = subprocess.Popen (["openssl", "enc", "-e", "-aes-256-cbc", "-pass", "pass:"+passphrase], stdin=pipe, stdout=subprocess.PIPE)
run_error = wait_backup_feedback(compute_progress, encryptor.stdout, encryptor, chunkfile_p, total_backup_sz, hmac=hmac, vmproc=vmproc, addproc=tar_sparse)
else:
run_error = wait_backup_feedback(compute_progress, pipe, None, chunkfile_p, total_backup_sz, hmac=hmac, vmproc=vmproc, addproc=tar_sparse)
chunkfile_p.close()
print "Wait_backup_feedback returned:",run_error
@ -1152,9 +1170,6 @@ def backup_do_copy(base_backup_dir, files_to_backup, progress_callback = None, e
# Send the chunk to the backup target
to_send.put(chunkfile.split(os.path.normpath(backup_tmpdir)+"/")[1])
#tar_final_cmd = ["tar", "-cO", "-C", backup_tmpdir, chunkfile.split(os.path.normpath(backup_tmpdir)+"/")[1]]
#final_proc = subprocess.Popen (tar_final_cmd, stdin=subprocess.PIPE, stdout=backup_stdout)
#final_proc.wait()
# Close HMAC
hmac.stdin.close()
@ -1171,10 +1186,7 @@ def backup_do_copy(base_backup_dir, files_to_backup, progress_callback = None, e
# Send the HMAC to the backup target
to_send.put(chunkfile.split(os.path.normpath(backup_tmpdir)+"/")[1]+".hmac")
#tar_final_cmd = ["tar", "-cO", "-C", backup_tmpdir, chunkfile.split(os.path.normpath(backup_tmpdir)+"/")[1]+".hmac"]
#final_proc = subprocess.Popen (tar_final_cmd, stdin=subprocess.PIPE, stdout=backup_stdout)
#final_proc.wait()
if tar_sparse.poll() == None:
# Release the next chunk
print "Release next chunk for process:",tar_sparse.poll()
@ -1184,7 +1196,8 @@ def backup_do_copy(base_backup_dir, files_to_backup, progress_callback = None, e
else:
print "Finished tar sparse with error",tar_sparse.poll()
pipe.close()
# Close the backup target and wait for it to finish
#backup_stdout.close()
@ -1206,7 +1219,7 @@ def backup_do_copy(base_backup_dir, files_to_backup, progress_callback = None, e
' - all of the monitored processes except vmproc finished successfully (vmproc termination is controlled by the python script)
' - streamproc does not delivers any data anymore (return with the error "paused")
'''
def wait_backup_feedback(progress_callback, streamproc, backup_target, total_backup_sz, hmac=None, vmproc=None, addproc=None, remove_trailing_bytes=0):
def wait_backup_feedback(progress_callback, in_stream, streamproc, backup_target, total_backup_sz, hmac=None, vmproc=None, addproc=None, remove_trailing_bytes=0):
buffer_size = 4096
@ -1215,12 +1228,9 @@ def wait_backup_feedback(progress_callback, streamproc, backup_target, total_bac
blocks_backedup = 0
while run_count > 0 and run_error == None:
buffer = streamproc.stdout.read(buffer_size)
buffer = in_stream.read(buffer_size)
blocks_backedup += len(buffer)
progress = blocks_backedup / float(total_backup_sz)
progress_callback(round(progress*100,2))
progress_callback(len(buffer),total_backup_sz)
run_count = 0
if hmac:
@ -1240,37 +1250,6 @@ def wait_backup_feedback(progress_callback, streamproc, backup_target, total_bac
else:
run_count += 1
retcode=streamproc.poll()
if retcode != None:
if retcode != 0:
run_error = "streamproc"
print "INFO: run error"
elif retcode == 0 and len(buffer) <= 0:
print "INFO: no data"
return ""
else:
print "INFO: last packet"
#if remove_trailing_bytes > 0:
# print buffer.encode("hex")
# buffer = buffer[:-remove_trailing_bytes]
# print buffer.encode("hex")
backup_target.write(buffer)
if hmac:
hmac.stdin.write(buffer)
run_count += 1
else:
#print "Process running:",len(buffer)
# Process still running
backup_target.write(buffer)
if hmac:
hmac.stdin.write(buffer)
run_count += 1
if vmproc:
retcode = vmproc.poll()
if retcode != None:
@ -1281,6 +1260,47 @@ def wait_backup_feedback(progress_callback, streamproc, backup_target, total_bac
# VM should run until the end
pass
if streamproc:
retcode=streamproc.poll()
if retcode != None:
if retcode != 0:
run_error = "streamproc"
elif retcode == 0 and len(buffer) <= 0:
return ""
else:
#print "INFO: last packet"
#if remove_trailing_bytes > 0:
# print buffer.encode("hex")
# buffer = buffer[:-remove_trailing_bytes]
# print buffer.encode("hex")
backup_target.write(buffer)
if hmac:
hmac.stdin.write(buffer)
run_count += 1
else:
#print "Process running:",len(buffer)
# Process still running
backup_target.write(buffer)
if hmac:
hmac.stdin.write(buffer)
run_count += 1
else:
if len(buffer) <= 0:
return ""
else:
backup_target.write(buffer)
if hmac:
hmac.stdin.write(buffer)
return run_error
def restore_vm_dir (backup_dir, src_dir, dst_dir, vm_spec, print_callback=None, error_callback=None, encrypted=False, appvm=None):