[Bug 2055895] Re: cp -n prints warning on stderr

[Nick Rosbrook]

This affects initramfs-tools autopkgtest[1]:

4856s autopkgtest [23:01:25]: test qemu-net: -----------------------]
4857s autopkgtest [23:01:26]: test qemu-net:  - - - - - - - - - - results - - - - - - - - - -
4857s qemu-net             FAIL stderr: cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s autopkgtest [23:01:26]: test qemu-net:  - - - - - - - - - - stderr - - - - - - - - - -
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead
4857s cp: warning: behavior of -n is non-portable and may change in future; use --update=none instead

[1]
https://objectstorage.prodstack5.canonical.com/swift/v1/AUTH_0f9aae918d5b4744bf7b827671c86842/autopkgtest-
noble/noble/arm64/i/initramfs-tools/20240301_230142_4f7c6@/log.gz

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https://bugs.launchpad.net/bugs/2055895

Title:
  cp -n prints warning on stderr

Status in coreutils package in Ubuntu:
  New
Status in initramfs-tools package in Ubuntu:
  New

Bug description:
  With coreutils, cp -n will start printing a warning on stderr:

    cp: warning: behavior of -n is non-portable and may change in
  future; use --update=none instead

  See the debian bug for some more context: https://bugs.debian.org/cgi-
  bin/bugreport.cgi?bug=1058752

  This change may cause issues in other packages autopkgtest (given the
  stderr output) or elsewhere, so this bug is used to track such cases.

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