Allow path options to use user specific paths

Fixes #2054.

Allow users to be able to specify user specific paths. With this option
we can now commit bazel configuration file and force local action cache
activation per default:

  $ cat tools/bazel.rc
  build --experimental_local_disk_cache_path=~/.gerrit/bazel-cache/cas
  build --experimental_local_disk_cache
  build --experimental_strict_action_env

Test Plan:

  $ bazel test //src/test/java/com/google/devtools/build/lib:util_test

Closes #4852.

PiperOrigin-RevId: 189744599

1 files changed, 9 insertions, 1 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/util/OptionsUtils.java b/src/main/java/com/google/devtools/build/lib/util/OptionsUtils.java
index c94863ed86..029d08c8c1 100644
--- a/src/main/java/com/google/devtools/build/lib/util/OptionsUtils.java
+++ b/src/main/java/com/google/devtools/build/lib/util/OptionsUtils.java
@@ -14,6 +14,7 @@
 
 package com.google.devtools.build.lib.util;
 
+import com.google.common.base.Preconditions;
 import com.google.common.collect.ImmutableList;
 import com.google.devtools.build.lib.vfs.PathFragment;
 import com.google.devtools.common.options.Converter;
@@ -103,7 +104,11 @@ public final class OptionsUtils {
 
     @Override
     public PathFragment convert(String input) {
-      return PathFragment.create(input);
+      String path = Preconditions.checkNotNull(input);
+      if (!path.isEmpty() && path.startsWith("~/")) {
+        path = path.replace("~", System.getProperty("user.home"));
+      }
+      return PathFragment.create(path);
     }
 
     @Override
@@ -123,6 +128,9 @@ public final class OptionsUtils {
       List<PathFragment> list = new ArrayList<>();
       for (String piece : input.split(":")) {
         if (!piece.isEmpty()) {
+          if (piece.startsWith("~/")) {
+            piece = piece.replace("~", System.getProperty("user.home"));
+          }
           list.add(PathFragment.create(piece));
         }
       }