Cannot access input property sourceLinks.localDirectory #2786
Description
Supposedly, because GradleSourceLinkBuilder#localDirectory is marked as InputDirectory, it keeps track of all the files within this directory so that it can mark the task as out-of-date if anything changes.
However, when localDirectory is targeting a directory with a lot of files (like the whole of the standard library), it can cause the following exceptions:
Cannot access input property 'unsuppressedSourceSets.$0.sourceLinks.$0.localDirectory' of task ':stdlib_1.0'
java.io.UncheckedIOException: Failed to create MD5 hash for file content.
at org.gradle.internal.hash.DefaultStreamHasher.hash(DefaultStreamHasher.java:37)
at org.gradle.internal.hash.DefaultFileHasher.hash(DefaultFileHasher.java:41)
at org.gradle.api.internal.changedetection.state.CachingFileHasher.snapshot(CachingFileHasher.java:94)
at org.gradle.api.internal.changedetection.state.CachingFileHasher.hash(CachingFileHasher.java:76)
at org.gradle.api.internal.changedetection.state.SplitFileHasher.hash(SplitFileHasher.java:54)
at org.gradle.internal.snapshot.impl.DirectorySnapshotter$PathVisitor.snapshotFile(DirectorySnapshotter.java:347)
.....
Caused by: java.io.IOException: The process cannot access the file because another process has locked a portion of the file
at java.io.FileInputStream.readBytes(Native Method)
at java.io.FileInputStream.read(FileInputStream.java:233)
at org.gradle.internal.hash.DefaultStreamHasher.doHash(DefaultStreamHasher.java:52)
at org.gradle.internal.hash.DefaultStreamHasher.hash(DefaultStreamHasher.java:35)
... 120 more
These exceptions do not stop the build, but they slow it down considerably.
Should be reproducible on https://github.com/vmishenev/kotlin/tree/update-dokka/libraries/tools/kotlin-stdlib-docs
This property is only used for getting the absolute path of the source files in order to add source links to signatures. I can see no reason for why it should be responsible for making Dokka tasks out of date.
That being said, maybe @InputDirectory could be dropped in favor of something simpler.