Roll forward execroot change

RELNOTES[INC]: Previously, an external repository would be symlinked into the
execution root at execroot/local_repo/external/remote_repo. This changes it to
be at execroot/remote_repo. This may break genrules/Skylark actions that
hardcode execution root paths. If this causes breakages for you, ensure that
genrules are using $(location :target) to access files and Skylark rules are
using http://bazel.io/docs/skylark/lib/File.html's path, dirname, etc.
functions. Custom crosstools that hardcode external/<repo> paths will have to
be updated.

Issue #1262.

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PiperOrigin-RevId: 147726370
MOS_MIGRATED_REVID=147726370

1 files changed, 1 insertions, 1 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/sandbox/SymlinkedExecRoot.java b/src/main/java/com/google/devtools/build/lib/sandbox/SymlinkedExecRoot.java
index bc60eae523..78e050ac42 100644
--- a/src/main/java/com/google/devtools/build/lib/sandbox/SymlinkedExecRoot.java
+++ b/src/main/java/com/google/devtools/build/lib/sandbox/SymlinkedExecRoot.java
@@ -92,7 +92,7 @@ public final class SymlinkedExecRoot implements SandboxExecRoot {
       throws IOException {
     for (PathFragment inputPath : inputs) {
       Path dir = sandboxExecRoot.getRelative(inputPath).getParentDirectory();
-      Preconditions.checkArgument(dir.startsWith(sandboxExecRoot));
+      Preconditions.checkArgument(dir.startsWith(sandboxExecRoot.getParentDirectory()));
       FileSystemUtils.createDirectoryAndParentsWithCache(createdDirs, dir);
     }
   }