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These bits are ignored by mkdirat(2) on every POSIX system (Linux does honour the sticky bit, though it is an outlier). We could ignore them but this seems less than ideal (a user could be under the impression their code works when actually the bit is not getting set) so returning an informative error is preferable. Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
S_ISGID is applied to directories created underneath it and affects the gid of all inodes created under a directory with it set. We need to handle this properly in order to avoid errors from our mode/owner validation logic. Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
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Fixes #23
Fixes #24
See opencontainers/runc#4401