Can we deliver a fix (or workaround) to this that consists in checking
if /dev/null is a char device?

if (-c "/dev/null") {
    append ">/dev/null" to command
}

Not great, but should fix adduser and useradd in environments where /dev
is not populated.

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https://bugs.launchpad.net/bugs/2049529

Title:
  Ubuntu delta causes `can't open /dev/null: No such file or directory`
  errors in minimal environments (chroot/unshare)

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