@Override
public void setAcl(List<AclEntry> acl) throws IOException {
// permission check
checkAccess(file, false, true);
// open file (will fail if file is a link and not following links)
int fd = file.openForAttributeAccess(followLinks);
try {
// SECURITY: need to copy list as can change during processing
acl = new ArrayList<AclEntry>(acl);
int n = acl.size();
long address = unsafe.allocateMemory(SIZEOF_ACE_T * n);
try {
encode(acl, address);
facl(fd, ACE_SETACL, n, address);
} catch (UnixException x) {
if ((x.errno() == ENOSYS) || !isAclsEnabled(fd)) {
throw new FileSystemException(
file.getPathForExceptionMessage(),
null,
x.getMessage() + " (file system does not support NFSv4 ACLs)");
}
if (x.errno() == EINVAL && (n < 3))
throw new IOException("ACL must contain at least 3 entries");
x.rethrowAsIOException(file);
} finally {
unsafe.freeMemory(address);
}
} finally {
close(fd);
}
}
@Override
public List<AclEntry> getAcl() throws IOException {
// permission check
checkAccess(file, true, false);
// open file (will fail if file is a link and not following links)
int fd = file.openForAttributeAccess(followLinks);
try {
long address = unsafe.allocateMemory(SIZEOF_ACE_T * MAX_ACL_ENTRIES);
try {
// read ACL and decode it
int n = facl(fd, ACE_GETACL, MAX_ACL_ENTRIES, address);
assert n >= 0;
return decode(address, n);
} catch (UnixException x) {
if ((x.errno() == ENOSYS) || !isAclsEnabled(fd)) {
throw new FileSystemException(
file.getPathForExceptionMessage(),
null,
x.getMessage() + " (file system does not support NFSv4 ACLs)");
}
x.rethrowAsIOException(file);
return null; // keep compiler happy
} finally {
unsafe.freeMemory(address);
}
} finally {
close(fd);
}
}
/** Permission checks to access file */
private void checkAccess(UnixPath file, boolean checkRead, boolean checkWrite) {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
if (checkRead) file.checkRead();
if (checkWrite) file.checkWrite();
sm.checkPermission(new RuntimePermission("accessUserInformation"));
}
}
@Override
public void setTimes(FileTime lastModifiedTime, FileTime lastAccessTime, FileTime createTime)
throws IOException {
// null => don't change
if (lastModifiedTime == null && lastAccessTime == null) {
// no effect
return;
}
// permission check
file.checkWrite();
int fd = file.openForAttributeAccess(followLinks);
try {
// if not changing both attributes then need existing attributes
if (lastModifiedTime == null || lastAccessTime == null) {
try {
UnixFileAttributes attrs = UnixFileAttributes.get(fd);
if (lastModifiedTime == null) lastModifiedTime = attrs.lastModifiedTime();
if (lastAccessTime == null) lastAccessTime = attrs.lastAccessTime();
} catch (UnixException x) {
x.rethrowAsIOException(file);
}
}
// uptime times
long modValue = lastModifiedTime.to(TimeUnit.MICROSECONDS);
long accessValue = lastAccessTime.to(TimeUnit.MICROSECONDS);
boolean retry = false;
try {
futimes(fd, accessValue, modValue);
} catch (UnixException x) {
// if futimes fails with EINVAL and one/both of the times is
// negative then we adjust the value to the epoch and retry.
if (x.errno() == UnixConstants.EINVAL && (modValue < 0L || accessValue < 0L)) {
retry = true;
} else {
x.rethrowAsIOException(file);
}
}
if (retry) {
if (modValue < 0L) modValue = 0L;
if (accessValue < 0L) accessValue = 0L;
try {
futimes(fd, accessValue, modValue);
} catch (UnixException x) {
x.rethrowAsIOException(file);
}
}
} finally {
close(fd);
}
}
@Override
public DynamicFileAttributeView getFileAttributeView(
Path obj, String name, LinkOption... options) {
if (name.equals("dos")) {
return new LinuxDosFileAttributeView(UnixPath.toUnixPath(obj), Util.followLinks(options));
}
if (name.equals("user")) {
return new LinuxUserDefinedFileAttributeView(
UnixPath.toUnixPath(obj), Util.followLinks(options));
}
return super.getFileAttributeView(obj, name, options);
}
@Override
@SuppressWarnings("unchecked")
public <V extends FileAttributeView> V getFileAttributeView(
Path obj, Class<V> type, LinkOption... options) {
if (type == DosFileAttributeView.class) {
return (V) new LinuxDosFileAttributeView(UnixPath.toUnixPath(obj), Util.followLinks(options));
}
if (type == UserDefinedFileAttributeView.class) {
return (V)
new LinuxUserDefinedFileAttributeView(
UnixPath.toUnixPath(obj), Util.followLinks(options));
}
return super.getFileAttributeView(obj, type, options);
}
@Override
public BasicFileAttributes readAttributes() throws IOException {
file.checkRead();
try {
UnixFileAttributes attrs = UnixFileAttributes.get(file, followLinks);
return attrs.asBasicFileAttributes();
} catch (UnixException x) {
x.rethrowAsIOException(file);
return null; // keep compiler happy
}
}