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fixperms
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fixperms_ids.py
"""Handles caching user and group database info in memory""" import grp import pwd class IDCache: """Handles caching user and group database info in memory""" # these lookups are fast, but when looking it up once per file chowned # to form verbose output, it adds up def __init__(self, role: str): self._grps = {} self._pwds = {} self._uid2name = {0: 'root'} self._gid2name = {0: 'root'} if role != 'WP3': self.getgrnam('nobody') self.getgrnam('mail') def getpwnam(self, name: str) -> pwd.struct_passwd: """Lookup and cache a struct_passwd by name Args: name (str): user name Raises: KeyError: user not found in /etc/passwd Returns: pwd.struct_passwd: pwd.getpwnam() result """ try: return self._pwds[name] except KeyError: pass try: val = pwd.getpwnam(name) except KeyError as exc: raise KeyError(f"The {name!r} user is missing") from exc self._pwds[name] = val self._uid2name[val.pw_uid] = name return val def getgrnam(self, name: str) -> grp.struct_group: """Lookup and cache a struct_group by name Args: name (str): group name Raises: KeyError: group not found in /etc/groups Returns: grp.struct_group: grp.getgrnam() result """ try: return self._grps[name] except KeyError: pass try: val = grp.getgrnam(name) except KeyError as exc: raise KeyError(f"The {name!r} group is missing") from exc self._grps[name] = val self._gid2name[val.gr_gid] = name return val def uid_label(self, uid: int) -> str: """Lookup and cache a user name by UID Args: uid (int): user ID Returns: str: user name to display, or string of the uid if it was missing """ assert uid != -1 try: return self._uid2name[uid] except KeyError: pass try: val = pwd.getpwuid(uid) except KeyError: self._uid2name[uid] = str(uid) return self._uid2name[uid] self._uid2name[uid] = val.pw_name self._pwds[val.pw_name] = val return self._uid2name[uid] def gid_label(self, gid: int) -> str: """Lookup and cache a group name by GID Args: gid (int): group ID Returns: str: group name to display, or string of the gid if it was missing """ assert gid != -1 try: return self._gid2name[gid] except KeyError: pass try: val = grp.getgrgid(gid) except KeyError: self._gid2name[gid] = str(gid) return self._gid2name[gid] self._gid2name[gid] = val.gr_name self._grps[val.gr_name] = val return self._gid2name[gid]