crlf-plugin: ignore inaccessible files and directories in crlf filter

It should workaround the following exception:

java.lang.UnsupportedOperationException
    at org.gradle.api.internal.file.UnauthorizedFileVisitDetails.isDirectory(UnauthorizedFileVisitDetails.java:46)
    at com.github.vlsi.gradle.git.GitHolder.compute(GitIgnoreFilter.kt:121)
    at com.github.vlsi.gradle.git.GitHolder.compute(GitIgnoreFilter.kt:109)
    at com.github.vlsi.gradle.git.GitIgnoreFilter.isSatisfiedBy(GitIgnoreFilter.kt:145)
    at com.github.vlsi.gradle.git.dsl.FilterExtensionsKt$gitignore$3.isSatisfiedBy(FilterExtensions.kt:47)
    at org.gradle.api.specs.OrSpec.isSatisfiedBy(OrSpec.java:48)
    at org.gradle.api.specs.NotSpec.isSatisfiedBy(NotSpec.java:36)
    at org.gradle.api.internal.file.collections.DefaultDirectoryWalker.shouldVisit(DefaultDirectoryWalker.java:53)
    at org.gradle.api.internal.file.collections.DefaultDirectoryWalker$PathVisitor.visitFileFailed(DefaultDirectoryWalker.java:141)
    at org.gradle.api.internal.file.collections.DefaultDirectoryWalker$PathVisitor.visitFileFailed(DefaultDirectoryWalker.java:68)
    at org.gradle.api.internal.file.collections.DefaultDirectoryWalker.walkDir(DefaultDirectoryWalker.java:62)
    at org.gradle.api.internal.file.collections.DirectoryFileTree.walkDir(DirectoryFileTree.java:148)
    at org.gradle.api.internal.file.collections.DirectoryFileTree.visitFrom(DirectoryFileTree.java:126)
    at org.gradle.api.internal.file.collections.DirectoryFileTree.visit(DirectoryFileTree.java:111)
    at org.gradle.api.internal.file.collections.FileTreeAdapter.visit(FileTreeAdapter.java:110)
    at org.gradle.api.internal.file.CompositeFileTree.visit(CompositeFileTree.java:108)
    at org.gradle.api.internal.file.copy.CopySpecActionImpl.execute(CopySpecActionImpl.java:43)
    at org.gradle.api.internal.file.copy.CopySpecActionImpl.execute(CopySpecActionImpl.java:25)
    at org.gradle.api.internal.file.copy.DefaultCopySpec$DefaultCopySpecResolver.walk(DefaultCopySpec.java:779)
    at org.gradle.api.internal.file.copy.DefaultCopySpec$DefaultCopySpecResolver.walk(DefaultCopySpec.java:781)
    at org.gradle.api.internal.file.copy.DefaultCopySpec$DefaultCopySpecResolver.walk(DefaultCopySpec.java:781)
    at org.gradle.api.internal.file.copy.DefaultCopySpec$DefaultCopySpecResolver.walk(DefaultCopySpec.java:781)
    at org.gradle.api.internal.file.copy.DefaultCopySpec$DefaultCopySpecResolver.walk(DefaultCopySpec.java:781)
    at org.gradle.api.internal.file.copy.DefaultCopySpec.walk(DefaultCopySpec.java:519)
    at org.gradle.api.internal.file.copy.CopySpecBackedCopyActionProcessingStream.process(CopySpecBackedCopyActionProcessingStream.java:42)
    at org.gradle.api.internal.file.copy.DuplicateHandlingCopyActionDecorator.lambda$execute$1(DuplicateHandlingCopyActionDecorator.java:47)
    at org.gradle.api.internal.file.copy.NormalizingCopyActionDecorator.lambda$execute$1(NormalizingCopyActionDecorator.java:62)
    at org.gradle.api.internal.file.archive.TarCopyAction$1.doExecute(TarCopyAction.java:78)
    at org.gradle.api.internal.file.archive.TarCopyAction$1.doExecute(TarCopyAction.java:67)
    at org.gradle.internal.ErroringAction.execute(ErroringAction.java:36)
    at org.gradle.internal.IoActions.withResource(IoActions.java:76)
    at org.gradle.api.internal.file.archive.TarCopyAction.execute(TarCopyAction.java:67)
    at org.gradle.api.internal.file.copy.NormalizingCopyActionDecorator.execute(NormalizingCopyActionDecorator.java:61)
    at org.gradle.api.internal.file.copy.DuplicateHandlingCopyActionDecorator.execute(DuplicateHandlingCopyActionDecorator.java:47)
    at org.gradle.api.internal.file.copy.CopyActionExecuter.execute(CopyActionExecuter.java:47)
    at org.gradle.api.tasks.AbstractCopyTask.copy(AbstractCopyTask.java:149)

Author: vlsi

README.md

@@ -89,6 +89,7 @@ Change log
 ----------
 v1.89
 * checksum-dependency: reduce the number of idle threads
+* crlf: ignore inaccessible files/folders in gitignore filter
 
 v1.88
 * stage-vote-release: avoid failures when "init" does not exist

plugins/crlf-plugin/src/main/kotlin/com/github/vlsi/gradle/git/GitIgnoreFilter.kt

@@ -30,6 +30,7 @@ import org.gradle.api.file.FileTreeElement
 import org.gradle.api.file.RelativePath
 import org.gradle.api.specs.Spec
 import java.io.File
+import java.lang.UnsupportedOperationException
 import java.nio.file.Path
 import java.util.*
 
@@ -118,7 +119,15 @@ abstract class GitHolder<T, V>(rootPath: Path) {
 
     @Suppress("MemberVisibilityCanBePrivate")
     fun compute(element: FileTreeElement): V =
-        computeFile(element.file, element.isDirectory)
+        computeFile(
+            element.file,
+            try {
+                element.isDirectory
+            } catch (e: UnsupportedOperationException) {
+                // If the element is not accessible, assume it is a directory
+                true
+            }
+        )
 
     @Suppress("MemberVisibilityCanBePrivate")
     fun compute(element: File): V =