[Bug 2122363] Re: cp -T: prefix not found

[Nick Rosbrook]

This also effects mkosi, as seen in the systemd autopkgtests[1]:

...SNIP...

2286s Found ninja-1.12.1 at /usr/bin/ninja
2287s + [ -f mkosi/mkosi.key ]
2287s + cp mkosi/mkosi.key mkosi/mkosi.crt /var/tmp/integration-tests.rGliJdoUJg/btrfs/build
2287s + ln -sf /var/tmp/integration-tests.rGliJdoUJg/btrfs/build build
2287s + mkosi -f
2287s ‣ Running clean script /tmp/autopkgtest.pEokOk/build.M8K/src/mkosi/mkosi.clean…
2287s ‣ Validating certificates and keys
2287s ‣ Copying in sandbox trees…
2287s cp: prefix not found
2287s ‣ "cp --recursive --no-dereference --preserve=mode,links --reflink=auto --copy-contents /work/etc/apt /work/var/tmp/integration-tests.rGliJdoUJg/mkosi-metadata-3y_kxg2k/etc/apt --no-target-directory" returned non-zero exit code 1.
2287s + cleanup
2287s + [ -f /var/tmp/integration-tests.rGliJdoUJg/btrfs/build/meson-logs/testlog.txt ]
2287s + [ -d /var/tmp/integration-tests.rGliJdoUJg/btrfs/build/test/journal ]
2287s + [ -n /var/tmp/integration-tests.rGliJdoUJg ]
2287s + umount /var/tmp/integration-tests.rGliJdoUJg/btrfs
2287s + losetup --detach /dev/loop0
2287s + rm -rf /var/tmp/integration-tests.rGliJdoUJg
2288s autopkgtest [08:30:35]: test upstream: -----------------------]

[1] https://autopkgtest.ubuntu.com/results/autopkgtest-
questing/questing/amd64/s/systemd/20250920_083053_6933b@/log.gz


** Also affects: mkosi (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/2122363

Title:
  cp -T: prefix not found

Status in mkosi package in Ubuntu:
  New
Status in rust-coreutils package in Ubuntu:
  Confirmed
Status in subiquity package in Ubuntu:
  Fix Released
Status in systemd package in Ubuntu:
  New

Bug description:
  with rust-coreutils, cp -T fails to behave like gnucp when using it to
  copy a source directory to a target location and that location doesn't
  exist yet.

  ```
  #!/bin/bash
  set -eux

  rm -fr src dst

  mkdir src
  touch src/file.txt

  /usr/lib/cargo/bin/coreutils/cp -aT src dst

  [ -f dst/file.txt ]
  ```

  Workarounds:
  * remove -T from the cp invocation
  * mkdir dst before the cp invocation

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