bazel fetch fails on pulling git repo

[endobson]

Important section of workspace

git_repository(
  name = "trunk",
  remote = "https://github.com/mzhaom/trunk.git",
  commit = "a4daafd562215a9e088cfc8997970d1182523ff9",
)

Error message.

endobson@yggdrasil () ~/proj/racket/racket-grpc % bazel fetch @trunk//:all                                                                                                                                                            (37)
.........
[4 / 4] Cloning https://github.com/mzhaom/trunk.git: Updating references (0 / 2)
java.lang.RuntimeException: Unrecoverable error while evaluating node 'GIT_CLONE:https://github.com/mzhaom/trunk.git -> /private/var/tmp/_bazel_endobson/c44540f7eaf5aad49840e43c8c60c881/external/trunk (a4daafd562215a9e088cfc8997970d1182523ff9) submodules: false' (requested by nodes 'GIT_REPOSITORY:@trunk')
        at com.google.devtools.build.skyframe.ParallelEvaluator$Evaluate.run(ParallelEvaluator.java:976)
        at com.google.devtools.build.lib.concurrent.AbstractQueueVisitor$2.run(AbstractQueueVisitor.java:495)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: org.eclipse.jgit.api.errors.JGitInternalException: Creating directories for /private/var/tmp/_bazel_endobson/c44540f7eaf5aad49840e43c8c60c881/external/trunk/third_party/libunwind/build/k8/include failed
        at org.eclipse.jgit.api.CheckoutCommand.call(CheckoutCommand.java:320)
        at com.google.devtools.build.lib.bazel.repository.GitCloneFunction.compute(GitCloneFunction.java:131)
        at com.google.devtools.build.skyframe.ParallelEvaluator$Evaluate.run(ParallelEvaluator.java:940)
        ... 4 more
Caused by: java.io.IOException: Creating directories for /private/var/tmp/_bazel_endobson/c44540f7eaf5aad49840e43c8c60c881/external/trunk/third_party/libunwind/build/k8/include failed
        at org.eclipse.jgit.util.FileUtils.mkdirs(FileUtils.java:316)
        at org.eclipse.jgit.dircache.DirCacheCheckout.checkoutEntry(DirCacheCheckout.java:1149)
        at org.eclipse.jgit.dircache.DirCacheCheckout.doCheckout(DirCacheCheckout.java:450)
        at org.eclipse.jgit.dircache.DirCacheCheckout.checkout(DirCacheCheckout.java:396)
        at org.eclipse.jgit.api.CheckoutCommand.call(CheckoutCommand.java:263)
        ... 6 more

endobson@yggdrasil () ~/proj/racket/racket-grpc % bazel version                                                                                                                                                                        (0)
.........
Build label: head (@3d84695)
Build target: bazel-out/local_darwin-fastbuild/bin/src/main/java/com/google/devtools/build/lib/bazel-main_deploy.jar
Build time: Wed Nov 18 09:53:41 2015 (1447840421)
Build timestamp: 1447840421
Build timestamp as int: 1447840421

[endobson]

I think this is because the git repo has a directory with a "BUILD" file and a subdirectory "build" which doesn't work on case insensitive file systems like mine. I'm not really sure what bazel can do in this case, but possibly something better than crashing and burning.

[damienmg]

Yes this is a known issue. We should detect when build is directory and do not try to parse + use the extension proposed to resolve #552

[kchodorow]

On the plus side, it doesn't fail as hideously anymore:

ERROR: no such package '@trunk//': Creating directories for /private/var/tmp/_bazel_kchodorow/16a1114002542b106523c47d490a1041/external/trunk/third_party/libunwind/build/k8/include failed.

On the downside, it's still not a great error message and this is from the guts of jgit (which just calls java.io.File.mkdir, which doesn't expose why a mkdir failed). I don't think there's anything more we can really do here.