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Docker doesn't honor hard links

bmgdc opened this issue · comments

commented

Problem description

Docker doesn't honor hard links. The Dockerfile. . .

FROM ubuntu:jammy

USER root

WORKDIR /home/the_best_user

RUN mkdir -p /home/the_best_user/parent_dir_1/child_dir_1
RUN mkdir /home/the_best_user/parent_dir_1/child_dir_2
RUN mkdir /home/the_best_user/parent_dir_1/child_dir_3
RUN mkdir -p /home/the_best_user/parent_dir_2/child_dir_1
RUN mkdir -p /home/the_best_user/parent_dir_2/child_dir_2/grandchild_dir_1
RUN mkdir /home/the_best_user/parent_dir_2/child_dir_3
RUN mkdir -p /home/the_best_user/parent_dir_3/child_dir_1
RUN mkdir /home/the_best_user/parent_dir_3/child_dir_2

RUN touch /home/the_best_user/parent_dir_3/child_dir_2/file1.txt
RUN touch /home/the_best_user/parent_dir_1/child_dir_3/file1.txt
RUN touch /home/the_best_user/parent_dir_1/child_dir_3/file2.txt
RUN touch /home/the_best_user/parent_dir_1/child_dir_3/file3.txt

. . . should leave the filesystem in a state such that the hard links are as follow.

root@6ce81005f874:/home/the_best_user# ls -hil
total 0
106348510 drwxr-xr-x 5 root root 63 Sep  7 00:26 parent_dir_1
106348508 drwxr-xr-x 5 root root 63 Sep  7 00:25 parent_dir_2
  5815910 drwxr-xr-x 4 root root 44 Sep  7 00:25 parent_dir_3

(This was obtained from running the exact same commands in the container).

However, as can be seen at the bottom of the following screenshot, they're all set to 1 for some reason.

image

The screenshot above is from the Play with Docker playground as is the following output.

docker info output

Docker Info:

Client:
 Version:    24.0.2
 Context:    default
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc.)
    Version:  v0.10.5
    Path:     /usr/local/libexec/docker/cli-plugins/docker-buildx
  compose: Docker Compose (Docker Inc.)
    Version:  v2.18.1
    Path:     /usr/local/libexec/docker/cli-plugins/docker-compose

Server:
 Containers: 6
  Running: 0
  Paused: 0
  Stopped: 6
 Images: 3
 Server Version: 24.0.2
 Storage Driver: overlay2
  Backing Filesystem: xfs
  Supports d_type: true
  Using metacopy: false
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 Cgroup Version: 1
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 1677a17964311325ed1c31e2c0a3589ce6d5c30d
 runc version: v1.1.7-0-g860f061
 init version: de40ad0
 Security Options:
  apparmor
  seccomp
   Profile: builtin
 Kernel Version: 4.4.0-210-generic
 Operating System: Alpine Linux v3.18 (containerized)
 OSType: linux
 Architecture: x86_64
 CPUs: 8
 Total Memory: 31.42GiB
 Name: node1
 ID: 64f4fda4-8342-4d49-9992-63a1b631386a
 Docker Root Dir: /var/lib/docker
 Debug Mode: true
  File Descriptors: 27
  Goroutines: 42
  System Time: 2023-09-07T00:37:45.416647811Z
  EventsListeners: 0
 Experimental: true
 Insecure Registries:
  127.0.0.1
  127.0.0.0/8
 Live Restore Enabled: false
 Product License: Community Engine

WARNING: API is accessible on http://0.0.0.0:2375 without encryption.
         Access to the remote API is equivalent to root access on the host. Refer
         to the 'Docker daemon attack surface' section in the documentation for
         more information: https://docs.docker.com/go/attack-surface/
WARNING: No swap limit support
WARNING: bridge-nf-call-iptables is disabled
WARNING: bridge-nf-call-ip6tables is disabled

Task List

  • This is NOT a security issue
  • I do NOT have a Docker subscription
  • I have looked through other issues and they do NOT apply to me
commented

Hi, this would probably be a report for https://github.com/moby/moby or https://github.com/moby/buildkit since this pertains to Docker Engine, not Docker Hub.