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[Julian Andres Klode <2112552@xxxxxxxxxxxxxxxxxx>]

Is anything else failing to build or is util-linux involved in a
transition? How is this built in proposed?

Given that this is a particularly special case about cat on procfs and
possibly sysfs, it's incredibly niche and it may be worthwhile to not
redirect it.

** Also affects: coreutils-from (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: coreutils-from (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/2112552

Title:
  cat doesn't handle EPERM

Status in coreutils-from package in Ubuntu:
  Incomplete
Status in rust-coreutils package in Ubuntu:
  Confirmed
Status in util-linux package in Ubuntu:
  Confirmed

Bug description:
  This was found while investigating FTBFS in util-linux
  (https://launchpadlibrarian.net/797485933/buildlog_ubuntu-questing-
  amd64.util-linux_2.41-4ubuntu1_BUILDING.txt.gz).

  This is triggered by this test: tests/ts/lsfd/mkfds-multiplexing
  This test was skipped with GNU coreutils, because at some point, `cat` fails (with reason) to read a file: https://github.com/util-linux/util-linux/blob/35128888075ade600413092214b62acf3601ead9/tests/ts/lsfd/mkfds-multiplexing#L49-L55
  With uutils coreutils, the test is not skipped, but fails for unclear reasons.

  It boils down to this very easy reproducer: cat /proc/$$/syscall

  GNU coreutils output:
  skia@noble:/$ cat /proc/$$/syscall
  cat: /proc/208/syscall: Operation not permitted
  skia@noble:/$ echo $?
  1

  uutils coreutils output:
  skia@questing:/$ cat /proc/$$/syscall
  skia@questing:/$ echo $?
  0

  `strace cat /proc/$$/syscall` clearly shows that `read()` return EPERM with both binaries:
  ...
  read(3, 0x7ffd4ef80798, 65536)          = -1 EPERM (Operation not permitted)
  ...

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