Revert "fuse: add benchmarking support for FUSE"

test/fuse/benchmark/read_benchmark.cc:34: Failure
Expected: (fuse_prefix) != (nullptr), actual: NULL vs (nullptr)
external/com_google_benchmark/src/benchmark_runner.cc:120: RunInThread:
Check `st.iterations() >= st.max_iterations' failed. Benchmark returned
before State::KeepRunning() returned false!
--- FAIL: Benchmarks_BM_Read/262144/real_time (0.29s)
    runner.go:502: test "Benchmarks.BM_Read/262144/real_time" failed
    with error exit status 134, want nil
FAIL

3 files changed, 0 insertions, 77 deletions

diff --git a/pkg/sentry/fs/g3doc/fuse.md b/pkg/sentry/fs/g3doc/fuse.md
index 496e339ce..2ca84dd74 100644
--- a/pkg/sentry/fs/g3doc/fuse.md
+++ b/pkg/sentry/fs/g3doc/fuse.md
@@ -254,53 +254,6 @@ I/O syscalls like `read(2)`, `write(2)` and `mmap(2)`.
 -   `FUSE_BMAP`: Old address space API for block defrag. Probably not needed.
 -   `FUSE_NOTIFY_REPLY`: [TODO: what does this do?]
 
-## Benchmark FUSE
-
-FUSE benchmark makes FUSE syscall inside docker container to make sure required
-environment conditions are met - such as having the right libraries to start a
-FUSE server.
-
-### Setup
-
-To run benchmark:
-
-1. Make sure you have `Docker` installed.
-2. Download all docker images `make load-all-images`.
-3. Config `runsc` docker runtime to have VFS2 and FUSE supported.
-(e.g.  `make configure RUNTIME=runsc ARGS="--vfs2 --fuse ..." ...`)
-
-You should now have a runtime with the following options configured in
-`/etc/docker/daemon.json`
-```
-"runsc": {
-            "path": "path/to/your/runsc",
-            "runtimeArgs": [
-                "--vfs2",
-                "--fuse"
-                ... 
-            ]
-        }
-```
-
-### Running benchmarks
-With above setup, benchmark can be run with following command
-```
-bazel test --test_output=all --cache_test_results=no --test_arg=-test.bench= //path/to:target
-```
-For example: if you want to run stat test
-```
-bazel test --test_output=all --cache_test_results=no --test_arg=-test.bench= //test/fuse:open_benchmark_runsc_ptrace_vfs2_fuse_container
-```
-
-Note:
-- test target need to have `vfs2_fuse_container` to run in container with `vfs2` and `fuse` enabled
-- `test_output` set to `all` to view the result in terminal
-- `--cache_test_results` set to `no` to avoid cached benchmark
-
-### Use your fuse server
-
-To use your own FUSE server, change the `images/basic/fuse/Dockerfile` to compile your FUSE server into the container and name it `server-bin`.
-
 # References
 
 -   [fuse(4) Linux manual page](https://www.man7.org/linux/man-pages/man4/fuse.4.html)
diff --git a/pkg/test/dockerutil/container.go b/pkg/test/dockerutil/container.go
index 727be26b2..64d17f661 100644
--- a/pkg/test/dockerutil/container.go
+++ b/pkg/test/dockerutil/container.go
@@ -136,11 +136,6 @@ func MakeNativeContainer(ctx context.Context, logger testutil.Logger) *Container
 	}
 }
 
-// Runtime returns the runtime of the container.
-func (c *Container) Runtime() string {
-	return c.runtime
-}
-
 // AddProfile adds a profile to this container.
 func (c *Container) AddProfile(p Profile) {
 	c.profiles = append(c.profiles, p)
@@ -546,8 +541,3 @@ func (c *Container) CleanUp(ctx context.Context) {
 	// Forget all mounts.
 	c.mounts = nil
 }
-
-// CopyErr returns the error that happened during copy.
-func (c *Container) CopyErr() error {
-	return c.copyErr
-}
diff --git a/pkg/test/dockerutil/dockerutil.go b/pkg/test/dockerutil/dockerutil.go
index a2d7e8c85..7027df1a5 100644
--- a/pkg/test/dockerutil/dockerutil.go
+++ b/pkg/test/dockerutil/dockerutil.go
@@ -121,26 +121,6 @@ func UsingVFS2() (bool, error) {
 	return false, nil
 }
 
-// UsingFUSE returns true if the 'runtime' has the fuse flag set.
-func UsingFUSE() (bool, error) {
-	rMap, err := runtimeMap()
-	if err != nil {
-		return false, err
-	}
-
-	list, ok := rMap["runtimeArgs"].([]interface{})
-	if !ok {
-		return false, fmt.Errorf("unexpected format: %v", rMap)
-	}
-
-	for _, element := range list {
-		if element == "--fuse" {
-			return true, nil
-		}
-	}
-	return false, nil
-}
-
 func runtimeMap() (map[string]interface{}, error) {
 	// Read the configuration data; the file must exist.
 	configBytes, err := ioutil.ReadFile(*config)