vidhar: borg copy

1 files changed, 216 insertions, 0 deletions

diff --git a/hosts/vidhar/borg/copy.py b/hosts/vidhar/borg/copy.py
new file mode 100755
index 00000000..b99e301a
--- /dev/null
+++ b/hosts/vidhar/borg/copy.py
@@ -0,0 +1,216 @@
+#!@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 time import sleep
+
+from halo import Halo
+
+
+parser = argparse.ArgumentParser()
+parser.add_argument('source', metavar='REPO_OR_ARCHIVE')
+parser.add_argument('target', metavar='REPO_OR_ARCHIVE')
+args = parser.parse_args()
+
+def read_repo(path):
+    with Halo(text=f'Listing {path}', spinner='arc') as sp:
+        res = None
+        with subprocess.Popen(['borg', 'list', '--info', '--lock-wait', '120', '--json', path], stdout=subprocess.PIPE) as proc:
+            res = json.load(proc.stdout)['archives']
+        sp.succeed(f'{len(res)} archives in {path}')
+    return res
+
+class ToSync:
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        while True:
+            try:
+                src = read_repo(args.source)
+                dst = read_repo(args.target)
+                for entry in src:
+                    if entry['name'] not in {dst_entry['name'] for dst_entry in dst} and not entry['name'].endswith('.checkpoint'):
+                        return entry
+                raise StopIteration
+            except (subprocess.CalledProcessError, json.decoder.JSONDecodeError) as err:
+                print(err, file=stderr)
+                continue
+
+def copy_archive(src_repo_path, dst_repo_path, entry):
+    cache_suffix = None
+    with Halo(text=f'Determine archive parameters', spinner='arc') 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', '120', '--json', src_repo_path], stdout=subprocess.PIPE) as proc:
+                repo_id = json.load(proc.stdout)['repository']['id']
+            if repo_id:
+                cache_suffix = f'{repo_id}_{match.group(1)}'
+        sp.succeed(f'Will process {entry["name"]} ({dateutil.parser.isoparse(entry["start"])}, cache_suffix={cache_suffix})')
+    with TemporaryDirectory(prefix=f'borg-mount_{entry["name"]}_') 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', 'proc', 'dev', 'sys', pathlib.Path(os.path.expanduser('~')).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)
+                subprocess.run(['mount', '--bind', pathlib.Path('/') / bindMount, chroot / bindMount], check=True)
+            os.chroot(chroot)
+            os.chdir('/')
+            dir = pathlib.Path('/borg')
+            dir.mkdir(parents=True,exist_ok=True)
+            with Halo(text=f'Determine size', spinner='arc') as sp:
+                total_size = None
+                total_files = None
+                with subprocess.Popen(['borg', 'info', '--info', '--json', '--lock-wait', '120', f'{src_repo_path}::{entry["name"]}'], stdout=subprocess.PIPE, text=True) as proc:
+                    stats = json.load(proc.stdout)['archives'][0]['stats']
+                    total_size = stats['original_size']
+                    total_files = stats['nfiles']
+                sp.succeed(f'{total_files} files, {naturalsize(total_size, binary=True)}')
+            # print(f'Mounting to {dir}', file=stderr)
+            with subprocess.Popen(['borg', 'mount', '--foreground', '--progress', '--lock-wait', '120', f'{src_repo_path}::{entry["name"]}', dir]) as mount_proc:
+                with Halo(text='Waiting for mount', spinner='arc') as sp:
+                    wait_start = datetime.now()
+                    while True:
+                        ret = subprocess.run(['mountpoint', '-q', dir])
+                        if ret.returncode == 0:
+                            break
+                        elif datetime.now() - wait_start > timedelta(minutes=10):
+                            ret.check_returncode()
+                        sleep(0.1)
+                    sp.succeed('Mounted')
+                while True:
+                    try:
+                        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=120',
+                                           '--one-file-system',
+                                           '--compression=auto,zstd,10',
+                                           '--chunker-params=10,23,16,4095',
+                                           '--files-cache=ctime,size',
+                                           '--show-rc',
+                                           # '--remote-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, cwd=dir, stdin=subprocess.DEVNULL, stderr=subprocess.PIPE, text=True, env=env) 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:
+                                        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)
+                                        progress.set_postfix(compressed=naturalsize(json_line['compressed_size'], binary=True), deduplicated=naturalsize(json_line['deduplicated_size'], binary=True), nfiles=f'{json_line["nfiles"]}/{total_files}', 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)
+                                    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:
+                                    continue
+                    except subprocess.CalledProcessError as err:
+                        print(err, file=stderr)
+                        continue
+                    else:
+                        break
+                mount_proc.terminate()
+            os._exit(0)
+        else:
+            while True:
+                waitpid, waitret = os.wait()
+                if waitret != 0:
+                    sys.exit(waitret)
+                if waitpid == child:
+                    break
+
+def main():
+    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())