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VirtioFS bind mount case-insensitive directory listing behavior #7218

@ummcheng

Description

@ummcheng

Description

Attempting to list a directory fails immediately after listing with a case-insensitive name from the same process. For example, if I have a directory named a, calling ls a and ls A separately will succeed, but ls a A fails with can't open 'a': No such file or directory when a is the directory's actual, case-sensitive name. Variations on the ordering and number of attempts (e.g. ls a A a a) can result in either a or A succeeding or failing.

This behavior is only observed when a bind mount is used and VirtioFS is selected, not gRPC FUSE.

Reproduce

The minimal reproducible example with ls is:

From host:

$ mkdir test && cd test
$ docker run --interactive --tty --rm --mount type=bind,src=$(pwd),dst=/test --workdir /test busybox sh

In container:

/test # mkdir a
/test # ls .
a
/test # ls a
/test # ls A
/test # ls . a
.:
a

a:
/test # ls . A
.:
a

A:
ls: can't open 'A': No such file or directory
/test # ls a A
A:

a:
ls: can't open 'a': No such file or directory
/test # ls a A a
A:
ls: can't open 'A': No such file or directory

a:
ls: can't open 'a': No such file or directory

a:

This is also reproducible with Python and Node images and REPLs:

From host:

$ docker run --interactive --tty --rm --mount type=bind,src=$(pwd),dst=/test --workdir /test python sh

In container:

# mkdir a
# python
Python 3.12.2 (main, Mar 12 2024, 08:01:18) [GCC 12.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from os import listdir
>>> listdir("./a")
[]
>>> listdir("./A")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
FileNotFoundError: [Errno 2] No such file or directory: './A'
>>> listdir("./a")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
FileNotFoundError: [Errno 2] No such file or directory: './a'
>>> listdir("./a")
[]
>>> listdir("./A")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
FileNotFoundError: [Errno 2] No such file or directory: './A'
>>> listdir("./A")
[]

From host:

$ docker run --interactive --tty --rm --mount type=bind,src=$(pwd),dst=/test --workdir /test node sh

In container:

# mkdir a
# node
Welcome to Node.js v21.7.1.
Type ".help" for more information.
> fs.readdirSync("./a")
[]
> fs.readdirSync("./A")
Uncaught Error: ENOENT: no such file or directory, scandir './A'
    at Object.readdirSync (node:fs:1508:26) {
  errno: -2,
  code: 'ENOENT',
  syscall: 'scandir',
  path: './A'
}
> fs.readdirSync("./A")
[]
> fs.readdirSync("./a")
Uncaught Error: ENOENT: no such file or directory, scandir './a'
    at Object.readdirSync (node:fs:1508:26) {
  errno: -2,
  code: 'ENOENT',
  syscall: 'scandir',
  path: './a'
}
> fs.readdirSync("./a")
[]

Expected behavior

I would expect that listing a directory with its actual, case-sensitive name to always succeed. I'm not sure what the expected behavior for listing a directory with a case-insensitive name is, but I would expect it to be consistently successful or unsuccessful.

docker version

Client:
 Cloud integration: v1.0.35+desktop.11
 Version:           25.0.3
 API version:       1.44
 Go version:        go1.21.6
 Git commit:        4debf41
 Built:             Tue Feb  6 21:13:26 2024
 OS/Arch:           darwin/arm64
 Context:           desktop-linux

Server: Docker Desktop 4.28.0 (139021)
 Engine:
  Version:          25.0.3
  API version:      1.44 (minimum version 1.24)
  Go version:       go1.21.6
  Git commit:       f417435
  Built:            Tue Feb  6 21:14:22 2024
  OS/Arch:          linux/arm64
  Experimental:     false
 containerd:
  Version:          1.6.28
  GitCommit:        ae07eda36dd25f8a1b98dfbf587313b99c0190bb
 runc:
  Version:          1.1.12
  GitCommit:        v1.1.12-0-g51d5e94
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0

docker info

Client:
 Version:    25.0.3
 Context:    desktop-linux
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc.)
    Version:  v0.12.1-desktop.4
    Path:     /Users/cheng/.docker/cli-plugins/docker-buildx
  compose: Docker Compose (Docker Inc.)
    Version:  v2.24.6-desktop.1
    Path:     /Users/cheng/.docker/cli-plugins/docker-compose
  debug: Get a shell into any image or container. (Docker Inc.)
    Version:  0.0.24
    Path:     /Users/cheng/.docker/cli-plugins/docker-debug
  dev: Docker Dev Environments (Docker Inc.)
    Version:  v0.1.0
    Path:     /Users/cheng/.docker/cli-plugins/docker-dev
  extension: Manages Docker extensions (Docker Inc.)
    Version:  v0.2.22
    Path:     /Users/cheng/.docker/cli-plugins/docker-extension
  feedback: Provide feedback, right in your terminal! (Docker Inc.)
    Version:  v1.0.4
    Path:     /Users/cheng/.docker/cli-plugins/docker-feedback
  init: Creates Docker-related starter files for your project (Docker Inc.)
    Version:  v1.0.1
    Path:     /Users/cheng/.docker/cli-plugins/docker-init
  sbom: View the packaged-based Software Bill Of Materials (SBOM) for an image (Anchore Inc.)
    Version:  0.6.0
    Path:     /Users/cheng/.docker/cli-plugins/docker-sbom
  scout: Docker Scout (Docker Inc.)
    Version:  v1.5.0
    Path:     /Users/cheng/.docker/cli-plugins/docker-scout
WARNING: Plugin "/Users/cheng/.docker/cli-plugins/docker-scan" is not valid: failed to fetch metadata: fork/exec /Users/cheng/.docker/cli-plugins/docker-scan: no such file or directory

Server:
 Containers: 1
  Running: 1
  Paused: 0
  Stopped: 0
 Images: 7
 Server Version: 25.0.3
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Using metacopy: false
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 Cgroup Version: 2
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local splunk syslog
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: ae07eda36dd25f8a1b98dfbf587313b99c0190bb
 runc version: v1.1.12-0-g51d5e94
 init version: de40ad0
 Security Options:
  seccomp
   Profile: unconfined
  cgroupns
 Kernel Version: 6.6.16-linuxkit
 Operating System: Docker Desktop
 OSType: linux
 Architecture: aarch64
 CPUs: 4
 Total Memory: 5.791GiB
 Name: docker-desktop
 ID: 00b44509-fe81-4d3c-b675-3f565ae428e1
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 HTTP Proxy: http.docker.internal:3128
 HTTPS Proxy: http.docker.internal:3128
 No Proxy: hubproxy.docker.internal
 Experimental: false
 Insecure Registries:
  hubproxy.docker.internal:5555
  127.0.0.0/8
 Live Restore Enabled: false

WARNING: daemon is not using the default seccomp profile

Diagnostics ID

CE4E8E1C-9163-4476-B178-2F6A87F30FC6/20240315120144

Additional Info

The host filesystem is APFS (not case-sensitive) on Apple M2.

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