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70 lines
2.6 KiB
Python
70 lines
2.6 KiB
Python
__package__ = 'archivebox.config'
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import os
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from pathlib import Path
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from contextlib import contextmanager
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#############################################################################################
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DATA_DIR = Path(os.getcwd())
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DATA_DIR_STAT = Path(DATA_DIR).stat()
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DATA_DIR_UID = DATA_DIR_STAT.st_uid
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DATA_DIR_GID = DATA_DIR_STAT.st_gid
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DEFAULT_PUID = 911
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DEFAULT_PGID = 911
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RUNNING_AS_UID = os.getuid()
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RUNNING_AS_GID = os.getgid()
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EUID = os.geteuid()
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EGID = os.getegid()
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USER: str = Path('~').expanduser().resolve().name
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IS_ROOT = RUNNING_AS_UID == 0
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IN_DOCKER = os.environ.get('IN_DOCKER', False) in ('1', 'true', 'True', 'TRUE', 'yes')
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os.environ.setdefault('PUID', str(DATA_DIR_UID or RUNNING_AS_UID or DEFAULT_PUID))
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os.environ.setdefault('PGID', str(DATA_DIR_GID or RUNNING_AS_GID or DEFAULT_PGID))
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ARCHIVEBOX_USER = int(os.environ['PUID'])
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ARCHIVEBOX_GROUP = int(os.environ['PGID'])
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#############################################################################################
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def drop_privileges():
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"""If running as root, drop privileges to the user that owns the data dir (or PUID, or default=911)"""
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# always run archivebox as the user that owns the data dir, never as root
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if os.getuid() == 0:
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# drop permissions to the user that owns the data dir / provided PUID
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if os.geteuid() != ARCHIVEBOX_USER:
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os.seteuid(ARCHIVEBOX_USER)
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# if we need sudo (e.g. for installing dependencies) code should use SudoPermissions() context manager to regain root
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@contextmanager
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def SudoPermission(uid=0, fallback=False):
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"""Attempt to run code with sudo permissions for a given user (or root)"""
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if os.geteuid() == uid:
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# no need to change effective UID, we are already that user
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yield
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return
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try:
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# change our effective UID to the given UID
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os.seteuid(uid)
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except PermissionError as err:
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if not fallback:
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raise PermissionError(f'Not enough permissions to run code as uid={uid}, please retry with sudo') from err
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try:
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# yield back to the caller so they can run code inside context as root
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yield
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finally:
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# then set effective UID back to DATA_DIR owner
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DATA_DIR_OWNER = DATA_DIR.stat().st_uid
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try:
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os.seteuid(DATA_DIR_OWNER)
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except PermissionError as err:
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if not fallback:
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raise PermissionError(f'Failed to revert uid={uid} back to {DATA_DIR_OWNER} after running code with sudo') from err
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