[Bug 2152867] Re: chown from rust-coreutils does not set the default/login group

[Gordon Lack]

Note that this was raised as an Issue on the Rust coreutils git last May
at:

https://github.com/uutils/coreutils/issues/8034

which lead to a pull:

https://github.com/uutils/coreutils/pull/8156

but that was closed in Dec with unmerged commits.

** Bug watch added: github.com/uutils/coreutils/issues #8034
   https://github.com/uutils/coreutils/issues/8034

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Title:
  chown from rust-coreutils does not set the default/login group

Status in rust-coreutils package in Ubuntu:
  New

Bug description:
  From the GNU chown manpage.

  If a colon but no group name follows the user name, that user is made
  the owner of the files and the group of the  files is changed  to that
  user's login group.

  However, the rust-coreutils version of chown does not do this. If given an id followed by just a colon it leaves the group unchanged.
  The rust versions are supposed to be drop-in replacements for the GNU utils.

  Here's the evidence.

  root at parent:~# touch test
  root at parent:~# ls -l test
  -rw-r--r-- 1 root root 0 May 18 02:15 test
  root at parent:~# gnuchown sys: test
  root at parent:~# ls -l test
  -rw-r--r-- 1 sys sys 0 May 18 02:15 test
  root at parent:~# gnuchown root: test
  root at parent:~# ls -l test
  -rw-r--r-- 1 root root 0 May 18 02:15 test
  root at parent:~# 
  root at parent:~# /usr/lib/cargo/bin/coreutils/chown sys: test
  root at parent:~# ls -l test
  -rw-r--r-- 1 sys root 0 May 18 02:15 test

  
  NOTE: this is on a 25.10 system, but it happens just the same on a 26.04 system.  I just happen to be on a 25.10 system reporting it.

  ProblemType: Bug
  DistroRelease: Ubuntu 25.10
  Package: rust-coreutils 0.2.2-0ubuntu2.1
  ProcVersionSignature: Ubuntu 6.17.0-29.29-generic 6.17.13
  Uname: Linux 6.17.0-29-generic x86_64
  ApportVersion: 2.33.1-0ubuntu3
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: KDE
  Date: Mon May 18 02:11:34 2026
  InstallationDate: Installed on 2024-05-15 (733 days ago)
  InstallationMedia: Kubuntu 24.04 LTS "Noble Numbat" - Release amd64 (20240425.1)
  SourcePackage: rust-coreutils
  UpgradeStatus: Upgraded to questing on 2025-10-27 (203 days ago)

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