another googler wanted a host unshare(1) for some testing... i added
that, and they complained that although the docs say
-r Become root (map current euid/egid to 0/0, implies -U) (--map-root-user)
it seems like -r _doesn't_ actually imply -U in practice (and they
seemed to have strace output to prove it).
i was assuming the code was just missing, but when i looked, i found:
// unshare -U does not imply -r, so we cannot use [+rU]
if (test_r()) toys.optflags |= FLAG_U;
but note the unshare/nsenter sharing there --- is it a problem that i
have unshare enabled but not nsenter? is that expected to work?
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