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We would return a real error sometimes from the callback, and FTW_STOP other
times. Because of FTW_ACTIONRETVAL, everything except FTW_STOP would be
ignored. I don't think using FTW_ACTIONRETVAL is useful.
nftw() can only be used meaningfully with errno. Even if we return a proper
value ourselves from the callback, it will be propagated as a return value from
nftw(), but there is no way to distinguish this from a value generated by
nftw() itself, which is -1/-EPERM on error. So let's set errno ourselves so the
caller can at least look at that.
The code still ignores all errors.
When seccomp_restrict_archs is called, architectures that are blocked
are replaced by the SECCOMP_LOCAL_ARCH_BLOCKED marker so that they are
not disabled again and filters are not installed for them.
This can make some service that use SystemCallArchitecture= and
SystemCallFilter= start faster.
A comment indicates the start of the new contents of the override file,
and another indicates that lines following it will be discarded once
editing is finished.
The contents of the unit file and drop-ins are listed out after this
last marker.
Adds WRITE_STRING_FILE_TRUNCATE to set O_TRUNC when opening a file.
Thanks to cgzones for providing the required SELinux function calls.
Co-authored-by: Christian Göttsche <cgzones@googlemail.com>
