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python:netcmd: Create a SHA256SUM file with checksums

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This allows to verify the backup tarball contents with:

  sha256sum -c SHA256SUM

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
This commit is contained in:
Andreas Schneider 2023-02-15 08:10:03 +01:00 committed by Andrew Bartlett
parent e584350a55
commit f5de1f8585
1 changed files with 25 additions and 0 deletions
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25
python/samba/netcmd/domain/backup.py
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@ -56,6 +56,7 @@ from samba.dsdb import _dsdb_load_udv_v2
from samba.ndr import ndr_pack from samba.ndr import ndr_pack
from samba.credentials import SMB_SIGNING_REQUIRED from samba.credentials import SMB_SIGNING_REQUIRED
from samba import safe_tarfile as tarfile from samba import safe_tarfile as tarfile
import hashlib
# work out a SID (based on a free RID) to use when the domain gets restored. # work out a SID (based on a free RID) to use when the domain gets restored.
@ -133,6 +134,14 @@ def backup_filepath(targetdir, name, time_str):
return os.path.join(targetdir, filename) return os.path.join(targetdir, filename)
def create_sha256sum(filename):
hash = hashlib.new('sha256')
with open(filename, "rb") as f:
for chunk in iter(lambda: f.read(65536), b""):
hash.update(chunk)
return hash.hexdigest()
def create_backup_tar(logger, tmpdir, backup_filepath): def create_backup_tar(logger, tmpdir, backup_filepath):
# Adds everything in the tmpdir into a new tar file # Adds everything in the tmpdir into a new tar file
logger.info("Creating backup file %s..." % backup_filepath) logger.info("Creating backup file %s..." % backup_filepath)
@ -1228,20 +1237,36 @@ class cmd_domain_backup_offline(samba.netcmd.Command):
os.remove(backup_fn) os.remove(backup_fn)
logger.info('building backup tar') logger.info('building backup tar')
chksum_list = []
for path in all_files: for path in all_files:
arc_path = self.get_arc_path(path, paths) arc_path = self.get_arc_path(path, paths)
if os.path.exists(path + self.backup_ext): if os.path.exists(path + self.backup_ext):
logger.info(' adding backup ' + arc_path + self.backup_ext + logger.info(' adding backup ' + arc_path + self.backup_ext +
' to tar and deleting file') ' to tar and deleting file')
chksum_list.append(
"%s %s" % (create_sha256sum(path + self.backup_ext),
arc_path))
tar.add(path + self.backup_ext, arcname=arc_path) tar.add(path + self.backup_ext, arcname=arc_path)
os.remove(path + self.backup_ext) os.remove(path + self.backup_ext)
elif path.endswith('.ldb') or path.endswith('.tdb'): elif path.endswith('.ldb') or path.endswith('.tdb'):
logger.info(' skipping ' + arc_path) logger.info(' skipping ' + arc_path)
elif os.path.isfile(path): elif os.path.isfile(path):
logger.info(' adding misc file ' + arc_path) logger.info(' adding misc file ' + arc_path)
chksum_list.append("%s %s" %
(create_sha256sum(path),
arc_path))
tar.add(path, arcname=arc_path) tar.add(path, arcname=arc_path)
chksum_filepath = os.path.join(temp_tar_dir, "SHA256SUM")
with open(chksum_filepath, "w") as f:
for c in chksum_list:
f.write(c + '\n')
tar.add(chksum_filepath, os.path.basename(chksum_filepath))
os.remove(chksum_filepath)
tar.close() tar.close()
os.rename(temp_tar_name, os.rename(temp_tar_name,
os.path.join(targetdir, os.path.join(targetdir,