docker build Dockerfile Home Directory Ownership Lost After RUN useradd

[Shea Tomsin]

The following now fails
```
cd $(mktemp -d);

cat > Dockerfile << "END"
FROM ubuntu:22.04

ARG user=ubuntu
RUN useradd -U -m $user && [ "$(stat --format '%U' /home/$user)" = "$user" ]
RUN ls -al /home

USER ubuntu
WORKDIR /home/ubuntu
RUN stat "$(realpath .)"; [ "$(stat --format '%U' .)" = "$user" ]
END

docker build --force-rm .
```
Doesn't work with
Docker version 20.10.25, build 20.10.25-0ubuntu1~22.04.1

Does work with
Docker version 20.10.21, build 20.10.21-0ubuntu1~22.04.3

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: docker.io 20.10.25-0ubuntu1~22.04.1
ProcVersionSignature: Ubuntu 5.19.0-50.50-generic 5.19.17
Uname: Linux 5.19.0-50-generic x86_64
ApportVersion: 2.20.11-0ubuntu82.5
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Fri Aug 4 01:58:26 2023
InstallationDate: Installed on 2023-07-25 (9 days ago)
InstallationMedia: Ubuntu 22.04.2 LTS "Jammy Jellyfish" - Release amd64 (20230223)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: docker.io-app
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Rob King (robpking)]

Confirmed this is an issue after downgrading docker.io package and running the same commands.

[Shea Tomsin (stomsin)]

https://github.com/docker/cli/issues/4481

[Shea Tomsin (stomsin)]

Triage by https://github.com/docker/cli/issues/4481 indicates that this issue may be specific to Ubuntu

[Artem Leshchev (matshch)]

Maybe it is related to https://bugs.launchpad.net/ubuntu/+source/docker.io-app/+bug/2029523 somehow. I've tested, fix from there also fixes this bug.