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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.node.admin.task.util.file;
import com.yahoo.vespa.hosted.node.admin.component.TaskContext;
import java.nio.file.Path;
import java.util.Objects;
import java.util.Optional;
import java.util.function.Consumer;
import java.util.function.Supplier;
import java.util.logging.Logger;
/**
* Class to converge file/directory attributes like owner and permissions to wanted values.
* Typically used by higher abstraction layers working on files (FileSync/FileWriter) or
* directories (MakeDirectory).
*
* @author hakonhall
*/
public class AttributeSync {
private static final Logger logger = Logger.getLogger(AttributeSync.class.getName());
private final UnixPath path;
private Optional<Integer> ownerId = Optional.empty();
private Optional<Integer> groupId = Optional.empty();
private Optional<String> permissions = Optional.empty();
public AttributeSync(Path path) {
this.path = new UnixPath(path);
}
public Optional<String> getPermissions() {
return permissions;
}
public AttributeSync withPermissions(String permissions) {
this.permissions = Optional.of(permissions);
return this;
}
public Optional<Integer> ownerId() {
return ownerId;
}
public AttributeSync withOwnerId(int ownerId) {
this.ownerId = Optional.of(ownerId);
return this;
}
public Optional<Integer> groupId() {
return groupId;
}
public AttributeSync withGroupId(int groupId) {
this.groupId = Optional.of(groupId);
return this;
}
public AttributeSync with(PartialFileData fileData) {
ownerId = fileData.getOwnerId();
groupId = fileData.getGroupId();
permissions = fileData.getPermissions();
return this;
}
public boolean converge(TaskContext context) {
return converge(context, new FileAttributesCache(path));
}
/**
* Path must exist before calling converge.
*/
public boolean converge(TaskContext context, FileAttributesCache currentAttributes) {
boolean systemModified = updateAttribute(
context,
"user ID",
ownerId,
() -> currentAttributes.getOrThrow().ownerId(),
path::setOwnerId);
systemModified |= updateAttribute(
context,
"group ID",
groupId,
() -> currentAttributes.getOrThrow().groupId(),
path::setGroupId);
systemModified |= updateAttribute(
context,
"permissions",
permissions,
() -> currentAttributes.getOrThrow().permissions(),
path::setPermissions);
return systemModified;
}
private <T> boolean updateAttribute(TaskContext context,
String attributeName,
Optional<T> wantedValue,
Supplier<T> currentValueSupplier,
Consumer<T> valueSetter) {
if (wantedValue.isEmpty()) {
return false;
}
T currentValue = currentValueSupplier.get();
if (Objects.equals(currentValue, wantedValue.get())) {
return false;
}
context.recordSystemModification(
logger,
String.format("Changing %s of %s from %s to %s",
attributeName,
path,
currentValue,
wantedValue.get()));
valueSetter.accept(wantedValue.get());
return true;
}
}
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