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Code Issues Releases Wiki Activity

Some further improvemnets to mount error handling

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- Correctly handle FileOperationExceptions for the root mount.
 - Remove some checks from MountWrapper: Mount/WritableMount should do
   these already!
 - Normalise file paths, always using a '/'.
This commit is contained in:
Jonathan Coates
2022-12-10 12:54:49 +00:00
parent 367773e173
commit 18fbd96c10
4 changed files with 15 additions and 25 deletions
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3
projects/core-api/src/main/java/dan200/computercraft/api/filesystem/WritableMount.java
View File

@@ -32,7 +32,8 @@ public interface WritableMount extends Mount {
void makeDirectory(String path) throws IOException;
/**
* Deletes a directory at a given path inside the virtual file system.
* Deletes a directory at a given path inside the virtual file system. If the file does not exist, this method
* should do nothing.
*
* @param path A file path in normalised format, relative to the mount location. ie: "programs/myoldprograms".
* @throws IOException If the file does not exist or could not be deleted.

5
projects/core/src/main/java/dan200/computercraft/core/filesystem/FileMount.java
View File

@@ -5,6 +5,7 @@
*/
package dan200.computercraft.core.filesystem;
import com.google.common.base.Joiner;
import dan200.computercraft.api.filesystem.FileAttributes;
import dan200.computercraft.api.filesystem.FileOperationException;
import dan200.computercraft.api.filesystem.Mount;
@@ -104,7 +105,7 @@ public class FileMount implements Mount {
protected FileOperationException remapException(String fallbackPath, IOException exn) {
return exn instanceof FileSystemException fsExn
? remapException(fallbackPath, fsExn)
: new FileOperationException(fallbackPath, exn.getMessage() == null ? "Operation failed" : exn.getMessage());
: new FileOperationException(fallbackPath, exn.getMessage() == null ? "Access denied" : exn.getMessage());
}
/**
@@ -123,7 +124,7 @@ public class FileMount implements Mount {
var failedPath = Path.of(failedFile);
return failedPath.startsWith(root)
? new FileOperationException(root.relativize(failedPath).toString(), reason)
? new FileOperationException(Joiner.on('/').join(root.relativize(failedPath)), reason)
: new FileOperationException(fallbackPath, reason);
}

30
projects/core/src/main/java/dan200/computercraft/core/filesystem/MountWrapper.java
View File

@@ -79,7 +79,7 @@ class MountWrapper {
public boolean isDirectory(String path) throws FileSystemException {
path = toLocal(path);
try {
return mount.exists(path) && mount.isDirectory(path);
return mount.isDirectory(path);
} catch (IOException e) {
throw localExceptionOf(path, e);
}
@@ -101,8 +101,7 @@ class MountWrapper {
public long getSize(String path) throws FileSystemException {
path = toLocal(path);
try {
if (!mount.exists(path)) throw localExceptionOf(path, "No such file");
return mount.isDirectory(path) ? 0 : mount.getSize(path);
return mount.getSize(path);
} catch (IOException e) {
throw localExceptionOf(path, e);
}
@@ -111,7 +110,6 @@ class MountWrapper {
public BasicFileAttributes getAttributes(String path) throws FileSystemException {
path = toLocal(path);
try {
if (!mount.exists(path)) throw localExceptionOf(path, "No such file");
return mount.getAttributes(path);
} catch (IOException e) {
throw localExceptionOf(path, e);
@@ -121,11 +119,7 @@ class MountWrapper {
public SeekableByteChannel openForRead(String path) throws FileSystemException {
path = toLocal(path);
try {
if (mount.exists(path) && !mount.isDirectory(path)) {
return mount.openForRead(path);
} else {
throw localExceptionOf(path, "No such file");
}
return mount.openForRead(path);
} catch (IOException e) {
throw localExceptionOf(path, e);
}
@@ -136,11 +130,7 @@ class MountWrapper {
path = toLocal(path);
try {
if (mount.exists(path)) {
if (!mount.isDirectory(path)) throw localExceptionOf(path, "File exists");
} else {
writableMount.makeDirectory(path);
}
writableMount.makeDirectory(path);
} catch (IOException e) {
throw localExceptionOf(path, e);
}
@@ -151,9 +141,7 @@ class MountWrapper {
path = toLocal(path);
try {
if (mount.exists(path)) {
writableMount.delete(path);
}
writableMount.delete(path);
} catch (IOException e) {
throw localExceptionOf(path, e);
}
@@ -224,8 +212,8 @@ class MountWrapper {
return FileSystem.toLocal(path, location);
}
private FileSystemException localExceptionOf(@Nullable String localPath, IOException e) {
if (!location.isEmpty() && e instanceof FileOperationException ex) {
private FileSystemException localExceptionOf(String localPath, IOException e) {
if (e instanceof FileOperationException ex) {
if (ex.getFilename() != null) return localExceptionOf(ex.getFilename(), FileSystemException.getMessage(ex));
}
@@ -233,8 +221,8 @@ class MountWrapper {
// This error will contain the absolute path, leaking information about where MC is installed. We drop that,
// just taking the reason. We assume that the error refers to the input path.
var message = ex.getReason();
if (message == null) message = "Failed";
return localPath == null ? new FileSystemException(message) : localExceptionOf(localPath, message);
if (message == null) message = "Access denied";
return localExceptionOf(localPath, message);
}
return FileSystemException.of(e);

2
projects/core/src/main/java/dan200/computercraft/core/filesystem/WritableFileMount.java
View File

@@ -183,7 +183,7 @@ public class WritableFileMount extends FileMount implements WritableMount {
}
@Override
public SeekableByteChannel openForAppend(String path) throws IOException {
public SeekableByteChannel openForAppend(String path) throws FileOperationException {
create();
var file = resolvePath(path);