java.io.tmpdir when running java_test with bazel

Question

motivation:

I have a test that needs to write a short temp file (must be < 107 characters). Currently the test is using

Files.createTempFile(null,".sock");

issue

which when running I'm trying to figure out the java.io.tmp value when running java test using bazel. The different options I have is:

Setting $TEST_TMPDIR (or without)
Using "local"=True (or without)

Here is the result:

# local=True + TEST_TMPDIR=/btmp:
/btmp/_bazel_ors/719f891d5db9fd5e73ade25b0c847fd1/execroot/__main__/_tmp/8be6e61521c57d3cfc8585efa880e1ac/1638063256753562848.sock

# local=False + TEST_TMPDIR=/btmp:
/btmp/_bazel_ors/719f891d5db9fd5e73ade25b0c847fd1/bazel-sandbox/5561433121200492142/execroot/__main__/_tmp/8be6e61521c57d3cfc8585efa880e1ac/4867903879018296623.sock

# local=True , no TEST_TMPDIR:
/private/var/tmp/_bazel_ors/719f891d5db9fd5e73ade25b0c847fd1/execroot/__main__/_tmp/8be6e61521c57d3cfc8585efa880e1ac/984443110479498941.sock

# local=False , no TEST_TMPDIR:
/private/var/tmp/_bazel_ors/719f891d5db9fd5e73ade25b0c847fd1/bazel-sandbox/6199384508952843116/execroot/__main__/_tmp/8be6e61521c57d3cfc8585efa880e1ac/4588114364301475150.sock

Seems like the shortest temp prefix I can get is:

/private/var/tmp/_bazel_ors/719f891d5db9fd5e73ade25b0c847fd1/execroot/__main__/_tmp/

which is 85 char long (way too long for my needs).

How can I safely play with this configuration and make it a lot shorter?

note:

My env is mac osx sierra and I'm running bazel 0.5.1

orshachar · Accepted Answer · 2017-06-19 11:11:59Z

2

Solvable by adding this to the jvm_flags of the test target:

"jvm_flags" = ["-Djava.io.tmpdir=/tmp"],

But note that it would make the test less hermetic

answered Jun 19, 2017 at 11:11

orshachar

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hlopko · Accepted Answer · 2017-06-19 11:25:09Z

1

You can also tell bazel where it should store its outputs --output_base=/tmp/foo.

answered Jun 19, 2017 at 11:25

hlopko

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