@Override
public UserPrincipal getOwner() throws IOException {
checkAccess(file, true, false);
try {
UnixFileAttributes attrs = UnixFileAttributes.get(file, followLinks);
return UnixUserPrincipals.fromUid(attrs.uid());
} catch (UnixException x) {
x.rethrowAsIOException(file);
return null; // keep compile happy
}
}
/** Decode the buffer, returning an ACL */
private static List<AclEntry> decode(long address, int n) {
ArrayList<AclEntry> acl = new ArrayList<>(n);
for (int i = 0; i < n; i++) {
long offset = address + i * SIZEOF_ACE_T;
int uid = unsafe.getInt(offset + OFFSETOF_UID);
int mask = unsafe.getInt(offset + OFFSETOF_MASK);
int flags = (int) unsafe.getShort(offset + OFFSETOF_FLAGS);
int type = (int) unsafe.getShort(offset + OFFSETOF_TYPE);
// map uid and flags to UserPrincipal
UnixUserPrincipals.User who = null;
if ((flags & ACE_OWNER) > 0) {
who = UnixUserPrincipals.SPECIAL_OWNER;
} else if ((flags & ACE_GROUP) > 0) {
who = UnixUserPrincipals.SPECIAL_GROUP;
} else if ((flags & ACE_EVERYONE) > 0) {
who = UnixUserPrincipals.SPECIAL_EVERYONE;
} else if ((flags & ACE_IDENTIFIER_GROUP) > 0) {
who = UnixUserPrincipals.fromGid(uid);
} else {
who = UnixUserPrincipals.fromUid(uid);
}
AclEntryType aceType = null;
switch (type) {
case ACE_ACCESS_ALLOWED_ACE_TYPE:
aceType = AclEntryType.ALLOW;
break;
case ACE_ACCESS_DENIED_ACE_TYPE:
aceType = AclEntryType.DENY;
break;
case ACE_SYSTEM_AUDIT_ACE_TYPE:
aceType = AclEntryType.AUDIT;
break;
case ACE_SYSTEM_ALARM_ACE_TYPE:
aceType = AclEntryType.ALARM;
break;
default:
assert false;
}
Set<AclEntryPermission> aceMask = EnumSet.noneOf(AclEntryPermission.class);
if ((mask & ACE_READ_DATA) > 0) aceMask.add(AclEntryPermission.READ_DATA);
if ((mask & ACE_WRITE_DATA) > 0) aceMask.add(AclEntryPermission.WRITE_DATA);
if ((mask & ACE_APPEND_DATA) > 0) aceMask.add(AclEntryPermission.APPEND_DATA);
if ((mask & ACE_READ_NAMED_ATTRS) > 0) aceMask.add(AclEntryPermission.READ_NAMED_ATTRS);
if ((mask & ACE_WRITE_NAMED_ATTRS) > 0) aceMask.add(AclEntryPermission.WRITE_NAMED_ATTRS);
if ((mask & ACE_EXECUTE) > 0) aceMask.add(AclEntryPermission.EXECUTE);
if ((mask & ACE_DELETE_CHILD) > 0) aceMask.add(AclEntryPermission.DELETE_CHILD);
if ((mask & ACE_READ_ATTRIBUTES) > 0) aceMask.add(AclEntryPermission.READ_ATTRIBUTES);
if ((mask & ACE_WRITE_ATTRIBUTES) > 0) aceMask.add(AclEntryPermission.WRITE_ATTRIBUTES);
if ((mask & ACE_DELETE) > 0) aceMask.add(AclEntryPermission.DELETE);
if ((mask & ACE_READ_ACL) > 0) aceMask.add(AclEntryPermission.READ_ACL);
if ((mask & ACE_WRITE_ACL) > 0) aceMask.add(AclEntryPermission.WRITE_ACL);
if ((mask & ACE_WRITE_OWNER) > 0) aceMask.add(AclEntryPermission.WRITE_OWNER);
if ((mask & ACE_SYNCHRONIZE) > 0) aceMask.add(AclEntryPermission.SYNCHRONIZE);
Set<AclEntryFlag> aceFlags = EnumSet.noneOf(AclEntryFlag.class);
if ((flags & ACE_FILE_INHERIT_ACE) > 0) aceFlags.add(AclEntryFlag.FILE_INHERIT);
if ((flags & ACE_DIRECTORY_INHERIT_ACE) > 0) aceFlags.add(AclEntryFlag.DIRECTORY_INHERIT);
if ((flags & ACE_NO_PROPAGATE_INHERIT_ACE) > 0)
aceFlags.add(AclEntryFlag.NO_PROPAGATE_INHERIT);
if ((flags & ACE_INHERIT_ONLY_ACE) > 0) aceFlags.add(AclEntryFlag.INHERIT_ONLY);
// build the ACL entry and add it to the list
AclEntry ace =
AclEntry.newBuilder()
.setType(aceType)
.setPrincipal(who)
.setPermissions(aceMask)
.setFlags(aceFlags)
.build();
acl.add(ace);
}
return acl;
}