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Removed Dependency on FastMD5, now uses SHA1 hashes.

master
nathan 2017-07-29 22:11:49 +02:00
parent e72e6a041e
commit 268273aaf4
9 changed files with 260 additions and 310 deletions
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3
JavaBuilder.iml
View File

@ -34,10 +34,9 @@
<orderEntry type="library" name="javaparser" level="application" />
<orderEntry type="library" name="javatar" level="application" />
<orderEntry type="library" name="async-http-client" level="application" />
<orderEntry type="library" name="fast-md5" level="application" />
<orderEntry type="library" name="jsonbeans" level="application" />
<orderEntry type="library" name="netty-all" level="application" />
<orderEntry type="library" name="yamlbeans" level="application" />
<orderEntry type="library" name="kryo" level="application" />
</component>
</module>
</module>

7
LICENSE
View File

@ -14,13 +14,6 @@
Copyright 2010, dorkbox, llc
- FastMD5 - LGPL v3 License
http://www.twmacinta.com/myjava/fast_md5.php
Copyright 1996, Santeri Paavolainen, Helsinki Finland
Many changes Copyright 2002 - 2010 Timothy W Macinta
Originally written by Santeri Paavolainen, Helsinki Finland 1996
- FilenameUtils.java (normalize + dependencies) - Apache 2.0 License
http://commons.apache.org/proper/commons-io/
Copyright 2013, ASF

165
LICENSE.LGPLv3
View File

@ -1,165 +0,0 @@
GNU LESSER GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
This version of the GNU Lesser General Public License incorporates
the terms and conditions of version 3 of the GNU General Public
License, supplemented by the additional permissions listed below.
0. Additional Definitions.
As used herein, "this License" refers to version 3 of the GNU Lesser
General Public License, and the "GNU GPL" refers to version 3 of the GNU
General Public License.
"The Library" refers to a covered work governed by this License,
other than an Application or a Combined Work as defined below.
An "Application" is any work that makes use of an interface provided
by the Library, but which is not otherwise based on the Library.
Defining a subclass of a class defined by the Library is deemed a mode
of using an interface provided by the Library.
A "Combined Work" is a work produced by combining or linking an
Application with the Library. The particular version of the Library
with which the Combined Work was made is also called the "Linked
Version".
The "Minimal Corresponding Source" for a Combined Work means the
Corresponding Source for the Combined Work, excluding any source code
for portions of the Combined Work that, considered in isolation, are
based on the Application, and not on the Linked Version.
The "Corresponding Application Code" for a Combined Work means the
object code and/or source code for the Application, including any data
and utility programs needed for reproducing the Combined Work from the
Application, but excluding the System Libraries of the Combined Work.
1. Exception to Section 3 of the GNU GPL.
You may convey a covered work under sections 3 and 4 of this License
without being bound by section 3 of the GNU GPL.
2. Conveying Modified Versions.
If you modify a copy of the Library, and, in your modifications, a
facility refers to a function or data to be supplied by an Application
that uses the facility (other than as an argument passed when the
facility is invoked), then you may convey a copy of the modified
version:
a) under this License, provided that you make a good faith effort to
ensure that, in the event an Application does not supply the
function or data, the facility still operates, and performs
whatever part of its purpose remains meaningful, or
b) under the GNU GPL, with none of the additional permissions of
this License applicable to that copy.
3. Object Code Incorporating Material from Library Header Files.
The object code form of an Application may incorporate material from
a header file that is part of the Library. You may convey such object
code under terms of your choice, provided that, if the incorporated
material is not limited to numerical parameters, data structure
layouts and accessors, or small macros, inline functions and templates
(ten or fewer lines in length), you do both of the following:
a) Give prominent notice with each copy of the object code that the
Library is used in it and that the Library and its use are
covered by this License.
b) Accompany the object code with a copy of the GNU GPL and this license
document.
4. Combined Works.
You may convey a Combined Work under terms of your choice that,
taken together, effectively do not restrict modification of the
portions of the Library contained in the Combined Work and reverse
engineering for debugging such modifications, if you also do each of
the following:
a) Give prominent notice with each copy of the Combined Work that
the Library is used in it and that the Library and its use are
covered by this License.
b) Accompany the Combined Work with a copy of the GNU GPL and this license
document.
c) For a Combined Work that displays copyright notices during
execution, include the copyright notice for the Library among
these notices, as well as a reference directing the user to the
copies of the GNU GPL and this license document.
d) Do one of the following:
0) Convey the Minimal Corresponding Source under the terms of this
License, and the Corresponding Application Code in a form
suitable for, and under terms that permit, the user to
recombine or relink the Application with a modified version of
the Linked Version to produce a modified Combined Work, in the
manner specified by section 6 of the GNU GPL for conveying
Corresponding Source.
1) Use a suitable shared library mechanism for linking with the
Library. A suitable mechanism is one that (a) uses at run time
a copy of the Library already present on the user's computer
system, and (b) will operate properly with a modified version
of the Library that is interface-compatible with the Linked
Version.
e) Provide Installation Information, but only if you would otherwise
be required to provide such information under section 6 of the
GNU GPL, and only to the extent that such information is
necessary to install and execute a modified version of the
Combined Work produced by recombining or relinking the
Application with a modified version of the Linked Version. (If
you use option 4d0, the Installation Information must accompany
the Minimal Corresponding Source and Corresponding Application
Code. If you use option 4d1, you must provide the Installation
Information in the manner specified by section 6 of the GNU GPL
for conveying Corresponding Source.)
5. Combined Libraries.
You may place library facilities that are a work based on the
Library side by side in a single library together with other library
facilities that are not Applications and are not covered by this
License, and convey such a combined library under terms of your
choice, if you do both of the following:
a) Accompany the combined library with a copy of the same work based
on the Library, uncombined with any other library facilities,
conveyed under the terms of this License.
b) Give prominent notice with the combined library that part of it
is a work based on the Library, and explaining where to find the
accompanying uncombined form of the same work.
6. Revised Versions of the GNU Lesser General Public License.
The Free Software Foundation may publish revised and/or new versions
of the GNU Lesser General Public License from time to time. Such new
versions will be similar in spirit to the present version, but may
differ in detail to address new problems or concerns.
Each version is given a distinguishing version number. If the
Library as you received it specifies that a certain numbered version
of the GNU Lesser General Public License "or any later version"
applies to it, you have the option of following the terms and
conditions either of that published version or of any later version
published by the Free Software Foundation. If the Library as you
received it does not specify a version number of the GNU Lesser
General Public License, you may choose any version of the GNU Lesser
General Public License ever published by the Free Software Foundation.
If the Library as you received it specifies that a proxy can decide
whether future versions of the GNU Lesser General Public License shall
apply, that proxy's public statement of acceptance of any version is
permanent authorization for you to choose that version for the
Library.

120
src/dorkbox/build/Project.java
View File

@ -28,7 +28,6 @@ import java.util.List;
import java.util.Map;
import java.util.Set;
import org.bouncycastle.crypto.digests.MD5Digest;
import org.slf4j.Logger;
import com.esotericsoftware.kryo.Kryo;
@ -37,16 +36,15 @@ import com.esotericsoftware.kryo.io.Input;
import com.esotericsoftware.kryo.io.Output;
import com.esotericsoftware.minlog.Log;
import com.esotericsoftware.wildcard.Paths;
import com.twmacinta.util.MD5;
import dorkbox.BuildOptions;
import dorkbox.BuildVersion;
import dorkbox.Builder;
import dorkbox.build.util.BuildLog;
import dorkbox.build.util.Hash;
import dorkbox.build.util.OutputFile;
import dorkbox.build.util.ShutdownHook;
import dorkbox.license.License;
import dorkbox.util.Base64Fast;
import dorkbox.util.FileUtil;
import dorkbox.util.OS;
import dorkbox.util.SerializationManager;
@ -160,7 +158,7 @@ class Project<T extends Project<T>> {
try {
String oldHash = Builder.settings.get("BUILD", String.class);
String hashedContents = generateChecksums(paths);
String hashedContents = Hash.generateChecksums(paths);
if (oldHash != null) {
if (!oldHash.equals(hashedContents)) {
@ -185,6 +183,8 @@ class Project<T extends Project<T>> {
} catch (IOException e) {
e.printStackTrace();
}
Hash.forceRebuildAll = forceRebuildAll;
}
public static
@ -235,7 +235,6 @@ class Project<T extends Project<T>> {
// used to make sure licenses are called in the correct spot
private transient boolean calledLicenseBefore = false;
transient Paths checksumPaths = new Paths();
protected List<License> licenses = new ArrayList<License>();
protected BuildOptions buildOptions;
@ -259,6 +258,8 @@ class Project<T extends Project<T>> {
// true if we should rebuild this project
boolean forceRebuild = false;
protected transient Hash hash;
/**
* Temporary projects are always built, but not always exported to maven (this is controlled by the parent, non-temp project
* recursively)
@ -341,6 +342,8 @@ class Project<T extends Project<T>> {
this.stagingDir = FileUtil.normalize(STAGING + File.separator + lowerCase_outputDir);
// must call this method, because it's not overridden by jar type
outputFile0(new File(this.stagingDir.getParentFile(), this.name + getExtension()).getAbsolutePath(), null);
hash = new Hash(projectName, buildOptions);
}
/**
@ -522,7 +525,7 @@ class Project<T extends Project<T>> {
*/
public
T depends(final Paths dependencies) {
checksumPaths.add(dependencies);
hash.add(dependencies);
sourceDependencies.add(dependencies);
return (T) this;
@ -793,111 +796,6 @@ class Project<T extends Project<T>> {
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////////
//// CHECKSUM LOGIC
///////////////////////////////////////////////////////////////////////////////////////////////////////
/**
* Add a path to be checksum'd.
*/
@SuppressWarnings("WeakerAccess")
public final
void checksum(Paths path) {
this.checksumPaths.add(path);
}
/**
* @return true if the checksums for path match the saved checksums and the jar file exists, false if the check failed and the
* project needs to rebuild
*/
boolean verifyChecksums() throws IOException {
if (forceRebuildAll || this.buildOptions.compiler.forceRebuild) {
return false;
}
// check to see if our SOURCES *and check-summed files* have changed.
String hashedContents = generateChecksums(this.checksumPaths);
String checkContents = Builder.settings.get(this.name, String.class);
return hashedContents != null && hashedContents.equals(checkContents);
}
/**
* Saves the checksums for a given path
*/
void saveChecksums() throws IOException {
// by default, we save the build. When building a 'test' build, we opt to NOT save the build hashes, so that a 'normal' build
// will then compile.
if (!buildOptions.compiler.saveBuild) {
return;
}
// hash/save the sources *and check-summed files* files
String hashedContents = generateChecksums(this.checksumPaths);
Builder.settings.save(this.name, hashedContents);
}
/**
* Generates checksums for the given path
*/
public static
String generateChecksum(File file) throws IOException {
synchronized (Project.class) {
// calculate the hash of file
boolean found = false;
if (file.isFile() && file.canRead()) {
found = true;
}
if (!found) {
return null;
}
byte[] hashBytes = MD5.getHash(file);
return Base64Fast.encodeToString(hashBytes, false);
}
}
/**
* Generates checksums for the given path
*/
public static
String generateChecksums(Paths... paths) throws IOException {
synchronized (Project.class) {
// calculate the hash of all the files in the source path
Set<String> names = new HashSet<String>(64);
for (Paths path : paths) {
names.addAll(path.getPaths());
}
// hash of hash of files. faster than using java to hash files
MD5Digest md5_digest = new MD5Digest();
boolean found = false;
for (String name : names) {
File file = new File(name);
if (file.isFile() && file.canRead()) {
found = true;
byte[] hashBytes = MD5.getHash(file);
md5_digest.update(hashBytes, 0, hashBytes.length);
}
}
if (!found) {
return null;
}
byte[] hashBytes = new byte[md5_digest.getDigestSize()];
md5_digest.doFinal(hashBytes, 0);
return Base64Fast.encodeToString(hashBytes, false);
}
}
public
T version(BuildVersion version) {
this.version = version;

12
src/dorkbox/build/ProjectGwt.java
View File

@ -110,7 +110,7 @@ class ProjectGwt extends Project<ProjectGwt> {
if (srcDir.endsWith("src")) {
String parent = new File(srcDir).getAbsoluteFile()
.getParent();
checksum(new Paths(parent));
hash.add(parent);
}
return sourcePath(new Paths(srcDir, "./"));
@ -356,16 +356,15 @@ class ProjectGwt extends Project<ProjectGwt> {
*
* @return true if the checksums for path match the saved checksums and the jar file exists
*/
@Override
boolean verifyChecksums() throws IOException {
boolean sourceHashesSame = super.verifyChecksums();
boolean sourceHashesSame = hash.verifyChecksums();
if (!sourceHashesSame) {
return false;
}
// if the sources are the same, check the output dir
if (this.stagingDir.exists()) {
String dirChecksum = generateChecksum(this.stagingDir);
String dirChecksum = hash.generateChecksum(this.stagingDir);
String checkContents = Builder.settings.get(this.stagingDir.getAbsolutePath(), String.class);
return dirChecksum != null && dirChecksum.equals(checkContents);
@ -377,7 +376,6 @@ class ProjectGwt extends Project<ProjectGwt> {
/**
* GWT only cares about the output dir (it doesn't make jars for compiling) Saves the checksums for a given path
*/
@Override
void saveChecksums() throws IOException {
// by default, we save the build. When building a 'test' build, we opt to NOT save the build hashes, so that a 'normal' build
// will then compile.
@ -385,11 +383,11 @@ class ProjectGwt extends Project<ProjectGwt> {
return;
}
super.saveChecksums();
hash.saveChecksums();
// hash/save the output files (if there are any)
if (this.stagingDir.exists()) {
String fileChecksum = generateChecksum(this.stagingDir);
String fileChecksum = hash.generateChecksum(this.stagingDir);
Builder.settings.save(this.stagingDir.getAbsolutePath(), fileChecksum);
}
}

4
src/dorkbox/build/ProjectJar.java
View File

@ -88,9 +88,9 @@ public class ProjectJar extends Project<ProjectJar> {
public
ProjectJar outputFileNoWarn(final String outputFile, final String outputSourceFile) {
this.checksumPaths.addFile(outputFile);
hash.add(outputFile);
if (outputSourceFile != null) {
this.checksumPaths.addFile(outputSourceFile);
hash.add(outputSourceFile);
}
return super.outputFile(outputFile, outputSourceFile);

20
src/dorkbox/build/ProjectJava.java
View File

@ -98,7 +98,7 @@ class ProjectJava extends Project<ProjectJava> {
this.sourcePaths.add(sourcePaths);
// ALWAYS add the source paths to be checksumed!
checksum(sourcePaths);
hash.add(sourcePaths);
return this;
}
@ -110,7 +110,7 @@ class ProjectJava extends Project<ProjectJava> {
ProjectJava sourcePath(String srcDir) {
if (srcDir.endsWith("src")) {
String parent = new File(srcDir).getAbsoluteFile().getParent();
checksum(new Paths(parent));
hash.add(new Paths(parent));
}
return sourcePath(new Paths(srcDir, "./"));
@ -217,7 +217,7 @@ class ProjectJava extends Project<ProjectJava> {
// also, we DO NOT check jar versions/etc here (that happens later)
// if true, this means that the files ARE the same and they have not changed
final boolean b = project.verifyChecksums();
final boolean b = project.hash.verifyChecksums();
shouldBuild |= !b;
}
}
@ -905,14 +905,13 @@ class ProjectJava extends Project<ProjectJava> {
* @return true if the checksums for path match the saved checksums. If there is a JAR file, it also checks to see if it is built &
* matches the saved checksums. If it's a temp project (and specifies a jar) the jarChecksum is ignored (so only checksums based on source code changes)
*/
@Override
boolean verifyChecksums() throws IOException {
// if temporary + we override the status, we ALWAYS build it
if (this.temporary && this.overrideTemporary) {
return false;
}
boolean sourceHashesSame = super.verifyChecksums();
boolean sourceHashesSame = hash.verifyChecksums();
if (!sourceHashesSame) {
return false;
}
@ -926,7 +925,7 @@ class ProjectJava extends Project<ProjectJava> {
final File originalOutputFile = this.outputFile.getOriginal();
if (originalOutputFile.canRead()) {
String jarChecksum = generateChecksum(originalOutputFile);
String jarChecksum = hash.generateChecksum(originalOutputFile);
String checkContents = Builder.settings.get(this.name + ":" + originalOutputFile.getAbsolutePath(), String.class);
boolean outputFileGood = jarChecksum != null && jarChecksum.equals(checkContents);
@ -939,7 +938,7 @@ class ProjectJava extends Project<ProjectJava> {
final File originalOutputFileSource = this.outputFile.getSourceOriginal();
// now check the src.zip file (if there was one).
jarChecksum = generateChecksum(originalOutputFileSource);
jarChecksum = hash.generateChecksum(originalOutputFileSource);
checkContents = Builder.settings.get(this.name + ":" + originalOutputFileSource.getAbsolutePath(), String.class);
return jarChecksum != null && jarChecksum.equals(checkContents);
@ -961,7 +960,6 @@ class ProjectJava extends Project<ProjectJava> {
* Saves the checksums for a given path - PER PROJECT (otherwise updating a jar in one place, and saving it's checksum, will verify
* it everywhere else)
*/
@Override
void saveChecksums() throws IOException {
// by default, we save the build. When building a 'test' build, we opt to NOT save the build hashes, so that a 'normal' build
// will then compile.
@ -969,21 +967,21 @@ class ProjectJava extends Project<ProjectJava> {
return;
}
super.saveChecksums();
hash.saveChecksums();
// when we verify checksums, we verify the ORIGINAL (if there is version info) -- and when we SAVE checksums, we save the NEW version
final File currentOutputFile = this.outputFile.get();
// hash/save the jar file (if there was one)
if (currentOutputFile.exists()) {
String fileChecksum = generateChecksum(currentOutputFile);
String fileChecksum = hash.generateChecksum(currentOutputFile);
Builder.settings.save(this.name + ":" + currentOutputFile.getAbsolutePath(), fileChecksum);
if (this.jarable != null && this.jarable.includeSourceAsSeparate) {
final File currentOutputFileSource = this.outputFile.getSource();
// now check the src.zip file (if there was one).
fileChecksum = generateChecksum(currentOutputFileSource);
fileChecksum = hash.generateChecksum(currentOutputFileSource);
Builder.settings.save(this.name + ":" + currentOutputFileSource.getAbsolutePath(), fileChecksum);
}

229
src/dorkbox/build/util/Hash.java Normal file
View File

@ -0,0 +1,229 @@
/*
* Copyright 2012 dorkbox, llc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package dorkbox.build.util;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.HashSet;
import java.util.Set;
import com.esotericsoftware.wildcard.Paths;
import dorkbox.BuildOptions;
import dorkbox.Builder;
import dorkbox.build.Project;
import dorkbox.util.Base64Fast;
import dorkbox.util.IO;
/**
* CHECKSUM LOGIC
*/
@SuppressWarnings({"Convert2Diamond", "AnonymousHasLambdaAlternative"})
public
class Hash {
private static final ThreadLocal<MessageDigest> digestThreadLocal = new ThreadLocal<MessageDigest>() {
@Override
protected
MessageDigest initialValue() {
try {
return MessageDigest.getInstance("SHA-1");
} catch (NoSuchAlgorithmException ignored) {
// will never happen, since SHA1 is part of java.
return null;
}
}
};
// set by Project.java
public static boolean forceRebuildAll = false;
private transient Paths checksumPaths = new Paths();
private final String projectName;
private BuildOptions buildOptions;
public
Hash(final String projectName, BuildOptions buildOptions) {
this.projectName = projectName;
this.buildOptions = buildOptions;
}
/**
* Add paths to be checksum'd.
*/
public
void add(final Paths paths) {
this.checksumPaths.add(paths);
}
public
void add(final String file) {
this.checksumPaths.addFile(file);
}
/**
* @return true if the checksums for path match the saved checksums and the jar file exists, false if the check failed and the
* project needs to rebuild
*/
public
boolean verifyChecksums() throws IOException {
if (forceRebuildAll || this.buildOptions.compiler.forceRebuild) {
return false;
}
// check to see if our SOURCES *and check-summed files* have changed.
String hashedContents = generateChecksums(this.checksumPaths);
String checkContents = Builder.settings.get(this.projectName, String.class);
return hashedContents != null && hashedContents.equals(checkContents);
}
/**
* Saves the checksums for a given path
*/
public
void saveChecksums() throws IOException {
// hash/save the sources *and check-summed files* files
String hashedContents = generateChecksums(this.checksumPaths);
Builder.settings.save(this.projectName, hashedContents);
}
/**
* Generates checksums for the given path
*/
public static
String generateChecksum(File file) throws IOException {
synchronized (Project.class) {
// calculate the hash of file
boolean found = false;
if (file.isFile() && file.canRead()) {
found = true;
}
if (!found) {
return null;
}
MessageDigest sha1 = digestThreadLocal.get();
sha1.reset();
FileInputStream inputStream = null;
try {
inputStream = new FileInputStream(file);
FileChannel channel = inputStream.getChannel();
long length = file.length();
if (length > Integer.MAX_VALUE) {
// you could make this work with some care,
// but this code does not bother.
throw new IOException("File " + file.getAbsolutePath() + " is too large.");
}
ByteBuffer buffer = channel.map(FileChannel.MapMode.READ_ONLY, 0, length);
int bufsize = 1024 * 8;
byte[] temp = new byte[bufsize];
int bytesRead = 0;
while (bytesRead < length) {
int numBytes = (int) length - bytesRead >= bufsize ? bufsize : (int) length - bytesRead;
buffer.get(temp, 0, numBytes);
sha1.update(temp, 0, numBytes);
bytesRead += numBytes;
}
byte[] hashBytes = sha1.digest();
return Base64Fast.encodeToString(hashBytes, false);
} finally {
IO.closeQuietly(inputStream);
}
}
}
/**
* Generates checksums for the given path
*/
public static
String generateChecksums(Paths... paths) throws IOException {
synchronized (Project.class) {
// calculate the hash of all the files in the source path
Set<String> names = new HashSet<String>(64);
for (Paths path : paths) {
names.addAll(path.getPaths());
}
// hash of all files. faster than using java to hash files
MessageDigest sha1 = digestThreadLocal.get();
sha1.reset();
int bufsize = 1024 * 8;
byte[] temp = new byte[bufsize];
int bytesRead = 0;
boolean found = false;
for (String name : names) {
File file = new File(name);
if (file.isFile() && file.canRead()) {
found = true;
FileInputStream inputStream = null;
try {
inputStream = new FileInputStream(file);
FileChannel channel = inputStream.getChannel();
long length = file.length();
if (length > Integer.MAX_VALUE) {
// you could make this work with some care,
// but this code does not bother.
throw new IOException("File " + file.getAbsolutePath() + " is too large.");
}
ByteBuffer buffer = channel.map(FileChannel.MapMode.READ_ONLY, 0, length);
while (bytesRead < length) {
int numBytes = (int) length - bytesRead >= bufsize ? bufsize : (int) length - bytesRead;
buffer.get(temp, 0, numBytes);
sha1.update(temp, 0, numBytes);
bytesRead += numBytes;
}
} finally {
IO.closeQuietly(inputStream);
}
}
}
if (!found) {
return null;
}
byte[] hashBytes = sha1.digest();
return Base64Fast.encodeToString(hashBytes, false);
}
}
}

10
src/dorkbox/build/util/ShutdownHook.java
View File

@ -15,12 +15,12 @@
*/
package dorkbox.build.util;
import com.esotericsoftware.wildcard.Paths;
import dorkbox.Builder;
import dorkbox.build.Project;
import java.io.IOException;
import com.esotericsoftware.wildcard.Paths;
import dorkbox.Builder;
public
class ShutdownHook implements Runnable {
private final Paths paths;
@ -36,7 +36,7 @@ class ShutdownHook implements Runnable {
try {
BuildLog.start();
BuildLog.println("Saving build file checksums.");
String hashedContents = Project.generateChecksums(paths);
String hashedContents = Hash.generateChecksums(paths);
Builder.settings.save("BUILD", hashedContents);
BuildLog.finish();
} catch (IOException e) {