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#!@python@/bin/python
import json
import os
import subprocess
import re
import sys
from sys import stderr
from humanize import naturalsize
from tempfile import TemporaryDirectory
from datetime import (datetime, timedelta)
from dateutil.tz import (tzlocal, tzutc)
import dateutil.parser
import argparse
from tqdm import tqdm
from xdg import xdg_runtime_dir
import pathlib
import unshare
from pyprctl import cap_permitted, cap_inheritable, cap_effective, cap_ambient, Cap
from pwd import getpwnam
import signal
from time import sleep
from halo import Halo
from collections import deque
parser = argparse.ArgumentParser()
parser.add_argument('source', metavar='REPO_OR_ARCHIVE')
parser.add_argument('target', metavar='REPO_OR_ARCHIVE')
args = parser.parse_args()
halo_args = {
'stream': stderr,
'enabled': stderr.isatty(),
'spinner': 'arc'
}
borg_pwd = getpwnam('borg')
def as_borg(caps=set(), cwd=None):
if caps:
cap_permitted.add(*caps)
cap_inheritable.add(*caps)
cap_effective.add(*caps)
cap_ambient.add(*caps)
os.setgid(borg_pwd.pw_gid)
os.setuid(borg_pwd.pw_uid)
if cwd is not None:
os.chdir(cwd)
def read_repo(path):
with Halo(text=f'Listing {path}', **halo_args) as sp:
res = None
with subprocess.Popen(['borg', 'list', '--info', '--lock-wait=600', '--json', path], stdout=subprocess.PIPE, preexec_fn=lambda: as_borg()) as proc:
res = json.load(proc.stdout)['archives']
if sp.enabled:
sp.succeed(f'{len(res)} archives in {path}')
else:
print(f'{len(res)} archives in {path}', file=stderr)
return res
class ToSync:
to_sync = deque()
def __iter__(self):
return self
def __next__(self):
if self.to_sync:
return self.to_sync.popleft()
while True:
try:
src = read_repo(args.source)
dst = read_repo(args.target)
except (subprocess.CalledProcessError, json.decoder.JSONDecodeError) as err:
print(err, file=stderr)
continue
self.to_sync.extend([entry for entry in src if entry['name'] not in {dst_entry['name'] for dst_entry in dst} and not entry['name'].endswith('.checkpoint')])
if self.to_sync:
return self.to_sync.popleft()
raise StopIteration
def copy_archive(src_repo_path, dst_repo_path, entry):
cache_suffix = None
with Halo(text=f'Determine archive parameters', **halo_args) as sp:
match = re.compile('^(.*)-[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}(\.(checkpoint|recreate)(\.[0-9]+)?)?').fullmatch(entry['name'])
if match:
repo_id = None
with subprocess.Popen(['borg', 'info', '--info', '--lock-wait=600', '--json', src_repo_path], stdout=subprocess.PIPE, preexec_fn=lambda: as_borg()) as proc:
repo_id = json.load(proc.stdout)['repository']['id']
if repo_id:
cache_suffix = f'{repo_id}_{match.group(1)}'
if sp.enabled:
sp.succeed(f'Will process {entry["name"]} ({dateutil.parser.isoparse(entry["start"])}, cache_suffix={cache_suffix})')
else:
print(f'Will process {entry["name"]} ({dateutil.parser.isoparse(entry["start"])}, cache_suffix={cache_suffix})', file=stderr)
with TemporaryDirectory(prefix=f'borg-mount_{entry["name"]}_', dir=os.environ.get('RUNTIME_DIRECTORY')) as tmpdir:
child = os.fork()
if child == 0:
# print('unshare/chroot', file=stderr)
unshare.unshare(unshare.CLONE_NEWNS)
subprocess.run(['mount', '--make-rprivate', '/'], check=True)
chroot = pathlib.Path(tmpdir) / 'chroot'
upper = pathlib.Path(tmpdir) / 'upper'
work = pathlib.Path(tmpdir) / 'work'
for path in [chroot,upper,work]:
path.mkdir()
subprocess.run(['mount', '-t', 'overlay', 'overlay', '-o', f'lowerdir=/,upperdir={upper},workdir={work}', chroot], check=True)
bindMounts = ['nix', 'run', 'run/secrets.d', 'run/wrappers', 'proc', 'dev', 'sys', pathlib.Path(os.path.expanduser('~')).relative_to('/')]
if os.environ.get('BORG_BASE_DIR'):
bindMounts.append(pathlib.Path(os.environ['BORG_BASE_DIR']).relative_to('/'))
if not ":" in src_repo_path:
bindMounts.append(pathlib.Path(src_repo_path).relative_to('/'))
if 'SSH_AUTH_SOCK' in os.environ:
bindMounts.append(pathlib.Path(os.environ['SSH_AUTH_SOCK']).parent.relative_to('/'))
for bindMount in bindMounts:
(chroot / bindMount).mkdir(parents=True,exist_ok=True)
# print(*['mount', '--bind', pathlib.Path('/') / bindMount, chroot / bindMount], file=stderr)
subprocess.run(['mount', '--bind', pathlib.Path('/') / bindMount, chroot / bindMount], check=True)
os.chroot(chroot)
os.chdir('/')
try:
os.unlink('/etc/fuse.conf')
except FileNotFoundError:
pass
pathlib.Path('/etc/fuse.conf').parent.mkdir(parents=True,exist_ok=True)
with open('/etc/fuse.conf', 'w') as fuse_conf:
fuse_conf.write('user_allow_other\nmount_max = 1000\n')
dir = pathlib.Path('/borg')
dir.mkdir(parents=True,exist_ok=True,mode=0o0750)
os.chown(dir, borg_pwd.pw_uid, borg_pwd.pw_gid)
total_size = None
total_files = None
if stderr.isatty():
with Halo(text=f'Determine size', **halo_args) as sp:
with subprocess.Popen(['borg', 'info', '--info', '--json', '--lock-wait=600', f'{src_repo_path}::{entry["name"]}'], stdout=subprocess.PIPE, text=True, preexec_fn=lambda: as_borg()) as proc:
stats = json.load(proc.stdout)['archives'][0]['stats']
total_size = stats['original_size']
total_files = stats['nfiles']
if sp.enabled:
sp.succeed(f'{total_files} files, {naturalsize(total_size, binary=True)}')
else:
print(f'{total_files} files, {naturalsize(total_size, binary=True)}', file=stderr)
# print(f'Mounting to {dir}', file=stderr)
with subprocess.Popen(['borg', 'mount', '-o', 'allow_other,ignore_permissions', '--foreground', '--progress', '--lock-wait=600', f'{src_repo_path}::{entry["name"]}', dir], preexec_fn=lambda: as_borg()) as mount_proc:
with Halo(text='Waiting for mount', **halo_args) as sp:
wait_start = datetime.now()
while True:
if os.path.ismount(dir):
break
elif datetime.now() - wait_start > timedelta(minutes=15):
ret.check_returncode()
sleep(0.1)
if sp.enabled:
sp.succeed('Mounted')
else:
print('Mounted', file=stderr)
while True:
with tqdm(total=total_size, unit_scale=True, unit_divisor=1024, unit='B', smoothing=0.01, disable=None, dynamic_ncols=True, maxinterval=0.5, miniters=1) as progress:
seen = 0
env = os.environ.copy()
create_args = ['borg',
'create',
'--lock-wait=600',
'--one-file-system',
'--compression=auto,zstd,10',
'--chunker-params=10,23,16,4095',
'--files-cache=ctime,size',
'--show-rc',
'--upload-buffer=100',
'--upload-ratelimit=20480',
'--log-json',
'--progress',
'--list',
'--filter=AMEi-x?',
'--stats'
]
archive_time = datetime.strptime(entry["time"], "%Y-%m-%dT%H:%M:%S.%f").replace(tzinfo=tzlocal()).astimezone(tzutc())
create_args += [f'--timestamp={archive_time.strftime("%Y-%m-%dT%H:%M:%S")}']
if cache_suffix:
env['BORG_FILES_CACHE_SUFFIX'] = cache_suffix
else:
create_args += ['--files-cache=disabled']
create_args += [f'{dst_repo_path}::{entry["name"]}', '.']
with subprocess.Popen(create_args, stdin=subprocess.DEVNULL, stderr=subprocess.PIPE, text=True, env=env, preexec_fn=lambda: as_borg(caps={Cap.DAC_READ_SEARCH}, cwd=dir)) as proc:
last_list = None
last_list_time = None
for line in proc.stderr:
try:
json_line = json.loads(line)
except json.decoder.JSONDecodeError:
tqdm.write(line)
continue
t = ''
if 'time' in json_line and stderr.isatty():
ts = datetime.fromtimestamp(json_line['time']).replace(tzinfo=tzlocal())
t = f'{ts.isoformat(timespec="minutes")} '
if json_line['type'] == 'archive_progress':
if last_list_time is None or ((datetime.now() - last_list_time) // timedelta(seconds=3)) % 2 == 1:
if 'path' in json_line and json_line['path']:
progress.set_description(f'… {json_line["path"]}', refresh=False)
else:
progress.set_description(None, refresh=False)
elif last_list is not None:
progress.set_description(last_list, refresh=False)
nfiles=json_line["nfiles"]
if total_files is not None:
nfiles=f'{json_line["nfiles"]}/{total_files}'
progress.set_postfix(compressed=naturalsize(json_line['compressed_size'], binary=True), deduplicated=naturalsize(json_line['deduplicated_size'], binary=True), nfiles=nfiles, refresh=False)
progress.update(json_line["original_size"] - seen)
seen = json_line["original_size"]
elif json_line['type'] == 'file_status':
# tqdm.write(t + f'{json_line["status"]} {json_line["path"]}')
last_list = f'{json_line["status"]} {json_line["path"]}'
last_list_time = datetime.now()
progress.set_description(last_list, refresh=False)
if not stderr.isatty():
print(last_list, file=stderr)
elif (json_line['type'] == 'log_message' or json_line['type'] == 'progress_message' or json_line['type'] == 'progress_percent') and ('message' in json_line or 'msgid' in json_line):
if 'message' in json_line:
tqdm.write(t + json_line['message'])
elif 'msgid' in json_line:
tqdm.write(t + json_line['msgid'])
else:
tqdm.write(t + line)
progress.set_description(None)
if proc.wait() != 0:
dst = None
try:
dst = read_repo(args.target)
except (subprocess.CalledProcessError, json.decoder.JSONDecodeError) as err:
print(err, file=stderr)
continue
else:
if any(map(lambda other: entry['name'] == other['name'], dst)):
break
continue
mount_proc.terminate()
os._exit(0)
else:
while True:
waitpid, waitret = os.wait()
if waitret != 0:
sys.exit(waitret)
if waitpid == child:
break
def sigterm(signum, frame):
raise SystemExit(128 + signum)
def main():
signal.signal(signal.SIGTERM, sigterm)
if "::" in args.source:
(src_repo_path, _, src_archive) = args.source.partition("::")
entry = None
for candidate_entry in read_repo(src_repo_path):
if entry['name'] != src_archive:
continue
entry = candidate_entry
break
if entry is None:
print("Did not find archive", file=stderr)
os.exit(1)
copy_archive(src_repo_path, args.target, entry)
else:
for entry in ToSync():
copy_archive(args.source, args.target, entry)
if __name__ == "__main__":
sys.exit(main())
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