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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.node.admin.nodeagent;
import java.util.Objects;
/**
* @author freva
*/
public class UserNamespace {
/**
* IDs outside the ID range are translated to the overflow ID before being written to disk:
* https://github.com/torvalds/linux/blob/5bfc75d92efd494db37f5c4c173d3639d4772966/Documentation/admin-guide/sysctl/fs.rst#overflowgid--overflowuid
* Real value in /proc/sys/fs/overflowuid or overflowgid, hardcode default value*/
private static final int OVERFLOW_ID = 65_534;
private final int uidOffset;
private final int gidOffset;
private final int idRangeSize;
public UserNamespace(int uidOffset, int gidOffset, int idRangeSize) {
this.uidOffset = uidOffset;
this.gidOffset = gidOffset;
this.idRangeSize = idRangeSize;
}
public int userIdOnHost(int containerUid) { return toHostId(containerUid, uidOffset, idRangeSize); }
public int groupIdOnHost(int containerGid) { return toHostId(containerGid, gidOffset, idRangeSize); }
public int userIdInContainer(int hostUid) { return toContainerId(hostUid, uidOffset, idRangeSize); }
public int groupIdInContainer(int hostGid) { return toContainerId(hostGid, gidOffset, idRangeSize); }
public int idRangeSize() { return idRangeSize; }
public int overflowId() { return OVERFLOW_ID; }
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
UserNamespace that = (UserNamespace) o;
return uidOffset == that.uidOffset && gidOffset == that.gidOffset && idRangeSize == that.idRangeSize;
}
@Override
public int hashCode() {
return Objects.hash(uidOffset, gidOffset, idRangeSize);
}
@Override
public String toString() {
return "UserNamespace{" +
"uidOffset=" + uidOffset +
", gidOffset=" + gidOffset +
", idRangeSize=" + idRangeSize +
'}';
}
private static int toHostId(int containerId, int idOffset, int idRangeSize) {
if (containerId < 0 || containerId > idRangeSize)
throw new IllegalArgumentException("Invalid container id: " + containerId);
return idOffset + containerId;
}
private static int toContainerId(int hostId, int idOffset, int idRangeSize) {
hostId = hostId - idOffset;
return hostId < 0 || hostId >= idRangeSize ? OVERFLOW_ID : hostId;
}
}
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