fstest_repro

fstest_repo

Reproduce behaviour that fstest.TestFS thinks is an error, but I think should not be considered an error. When TestFS attempts to open a file named file.txt for example, it will also attempt to open /file.txt and if the latter opens it considers it an error.

See: https://github.com/golang/go/blob/master/src/testing/fstest/testfs.go#L585

However if the other file exists simply by coincidence, or the filesystem being tested is rooted at / the tests will fail.

To run, just go run fstest_repro.go. This may require elevated permissions since it writes a file at /file.txt. For simplicity I've included a dockerfile which you can run with docker build -t fstest_repro:local . && docker run fstest_repro:local.

When I ran it I got the following output:

 [fg-386] fstest_repro > docker build -t fstest_repro:local . && docker run fstest_repro:local
Sending build context to Docker daemon   7.68kB
Step 1/4 : FROM golang:latest
 ---> 0debfc3e0c9e
Step 2/4 : WORKDIR /fstest_repro
 ---> Using cache
 ---> a761b21c49f2
Step 3/4 : COPY fstest_repro.go .
 ---> Using cache
 ---> e65642be0d55
Step 4/4 : CMD go run fstest_repro.go
 ---> Using cache
 ---> 5061046bfc5f
Successfully built 5061046bfc5f
Successfully tagged fstest_repro:local
ERROR:  TestFS found errors:
file.txt: Open(/file.txt) succeeded, want error
.: Open(/) succeeded, want error