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| Dir : //proc/thread-self/root/proc/self/root/proc/self/root/usr/lib/fixperms/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]