Fix local file mod dependencies (#430)

* ModProcessor: Add more descriptive error TR output error message

* Fix flatDir/files/fileTree mod dependencies

* Add clarifying comment

* Use hash as a placeholder version

* ProjectTestTrait: Copy instead of reading and writing text

This allows having jars and other binary data in tests.

* Add integration test for local file dependencies

* Use File.bytes instead of Files.copy

* Use truncated SHA256 instead of murmur3

1 files changed, 8 insertions, 1 deletions

diff --git a/src/main/java/net/fabricmc/loom/configuration/mods/ModProcessor.java b/src/main/java/net/fabricmc/loom/configuration/mods/ModProcessor.java
index 1f7e6395..c7088a0a 100644
--- a/src/main/java/net/fabricmc/loom/configuration/mods/ModProcessor.java
+++ b/src/main/java/net/fabricmc/loom/configuration/mods/ModProcessor.java
@@ -175,7 +175,14 @@ public class ModProcessor {
 
 		// Apply this in a second loop as we need to ensure all the inputs are on the classpath before remapping.
 		for (ModDependencyInfo info : remapList) {
-			OutputConsumerPath outputConsumer = new OutputConsumerPath.Builder(info.getRemappedOutput().toPath()).build();
+			OutputConsumerPath outputConsumer;
+
+			try {
+				outputConsumer = new OutputConsumerPath.Builder(info.getRemappedOutput().toPath()).build();
+			} catch (Exception e) {
+				throw new IOException("Could not create output consumer for " + info.getRemappedOutput().getAbsolutePath());
+			}
+
 			outputConsumer.addNonClassFiles(info.getInputFile().toPath());
 			outputConsumerMap.put(info, outputConsumer);
 			String accessWidener = info.getAccessWidener();