116 lines
2.8 KiB
Python
116 lines
2.8 KiB
Python
import glob
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import json
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from os.path import basename, dirname
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from pathlib import Path
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import time
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from consts import DATA_DIR
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from declarative import be_absent
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from volume_schema import migrate_to, LATEST_SCHEMA_VERSION
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from util import run, run_out
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def img_dir(volume_id):
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return Path(f"{DATA_DIR}/{volume_id}")
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def meta_file(volume_id):
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return Path(f"{img_dir(volume_id)}/disk.meta")
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def metadata(volume_id):
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try:
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return json.loads(meta_file(volume_id).read_text())
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except FileNotFoundError:
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return {}
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def img_file(volume_id):
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return Path(metadata(volume_id)["img_file"])
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def destroy(volume_id, dry_run=True):
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print(f"Destroying {volume_id}")
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if not dry_run:
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be_absent(img_file(volume_id))
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be_absent(meta_file(volume_id))
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be_absent(img_dir(volume_id))
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def gc_if_needed(volume_id, dry_run=True):
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meta = metadata(volume_id)
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deleted_at = meta.get("deleted_at", None)
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gc_at = meta.get("gc_at", None)
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if deleted_at is None or gc_at is None:
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return False
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now = time.time()
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if gc_at <= now:
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destroy(volume_id, dry_run=dry_run)
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return False
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def update_metadata(volume_id: str, obj: dict) -> dict:
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meta_file(volume_id).write_text(json.dumps(obj))
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return obj
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def patch_metadata(volume_id: str, obj: dict) -> dict:
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old_data = metadata(volume_id)
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new_data = {**old_data, **obj}
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return update_metadata(volume_id, new_data)
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def migrate_metadata(volume_id, target_version):
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old_data = metadata(volume_id)
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new_data = migrate_to(old_data, target_version)
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return update_metadata(volume_id, new_data)
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def attached_loops(file: str) -> [str]:
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out = run_out(f"losetup -j {file}").stdout.decode()
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lines = out.splitlines()
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devs = [line.split(":", 1)[0] for line in lines]
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return devs
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def attach_loop(file) -> str:
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def next_loop():
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loop_file = run_out(f"losetup -f").stdout.decode().strip()
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if not Path(loop_file).exists():
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pfx_len = len("/dev/loop")
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loop_dev_id = loop_file[pfx_len:]
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run(f"mknod {loop_file} b 7 {loop_dev_id}")
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return loop_file
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while True:
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devs = attached_loops(file)
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if len(devs) > 0:
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return devs[0]
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next_loop()
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run(f"losetup --direct-io=on -f {file}")
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def detach_loops(file) -> None:
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devs = attached_loops(file)
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for dev in devs:
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run(f"losetup -d {dev}")
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def list_all_volumes():
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metas = glob.glob(f"{DATA_DIR}/*/disk.meta")
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return [basename(dirname(meta)) for meta in metas]
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def migrate_all_volume_schemas():
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target_version = LATEST_SCHEMA_VERSION
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for volume_id in list_all_volumes():
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migrate_metadata(volume_id, target_version)
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def gc_all_volumes(dry_run=True):
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for volume_id in list_all_volumes():
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gc_if_needed(volume_id, dry_run=dry_run)
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