fixing scoverage sourcePath to be relative in OSS

Co-authored-by: Ny Saechao <[email protected]>

The problem is also referenced here : scoverage/scalac-scoverage-plugin#275

### Problem

Currently, at compile time, scoverage stores (as a string) the conical sourcePath (path for the source file) for a statement inside the instrument file `scoverage.coverage`. This string is then again required during report generation to get the source file in `ScoverageHtmlWriter` . This breaks in a distributed environment where report generation is happening on a different machine and is unable to locate the source file due to the absolute path.

### Solution

The current fix makes the path relative when storing and turns it back to a conical one (w.r.t cwd) on retrieving. For now, the fix is merged in twitter forked version of scoverage (version 1.0.2-twitter).

### Result

Scoverage can now work in a distributed environment.

3rdparty/jvm/com/twitter/scoverage/BUILD

@@ -5,10 +5,11 @@
 # https://github.com/twitter-forks/scalac-scoverage-plugin. PR for the modifications
 # on original scoverage repo here: https://github.com/scoverage/scalac-scoverage-plugin/pull/267.
 # In future, we should ping OSS Scoverage to get that PR merged and consume scoverage directly
-# from there.
+# from there. Version 1.0.2 incorporates the changes in the following PR:
+# https://github.com/scoverage/scalac-scoverage-plugin/pull/275.
 
 jar_library(name='scalac-scoverage-plugin',
   jars=[
-    scala_jar(org='com.twitter.scoverage', name='scalac-scoverage-plugin', rev='1.0.1-twitter'),
+    scala_jar(org='com.twitter.scoverage', name='scalac-scoverage-plugin', rev='1.0.2-twitter'),
     ],
   )

src/python/pants/backend/jvm/subsystems/scoverage_platform.py

@@ -49,12 +49,12 @@ def scoverage_jar(self):
             JarDependency(
                 org="com.twitter.scoverage",
                 name="scalac-scoverage-plugin_2.12",
-                rev="1.0.1-twitter",
+                rev="1.0.2-twitter",
             ),
             JarDependency(
                 org="com.twitter.scoverage",
                 name="scalac-scoverage-runtime_2.12",
-                rev="1.0.1-twitter",
+                rev="1.0.2-twitter",
             ),
         ]
 

src/python/pants/backend/jvm/tasks/coverage/scoverage.py

@@ -28,7 +28,7 @@ def register_options(cls, register):
 
             def scoverage_jar(name, **kwargs):
                 return JarDependency(
-                    org="com.twitter.scoverage", name=name, rev="1.0.1-twitter", **kwargs
+                    org="com.twitter.scoverage", name=name, rev="1.0.2-twitter", **kwargs
                 )
 
             def slf4j_jar(name):