Strange behaviour of trace mode in MacPorts 2.4.3 / 10.13

[Mojca Miklavec]

Dear Clemens,

On 29 April 2018 at 18:00, Clemens Lang wrote:
> On Sun, Apr 29, 2018 at 09:34:10AM +0200, Mojca Miklavec wrote:
>> Hi,
>>
>> This looks pretty strange to me:
>>
>> --->  Fetching distfiles for pymol
>> Executing:  cd "/path/to/pymol/work" && /usr/bin/svn --non-interactive
>> --trust-server-cert export
>> http://svn.code.sf.net/p/pymol/code/trunk/pymol@4187 2>&1
>> dyld: warning: could not load inserted library
>> '/opt/local/libexec/macports/lib/darwintrace1.0/darwintrace.dylib'
>> into library validated process because no suitable image found.  Did
>> find:
>> /opt/local/libexec/macports/lib/darwintrace1.0/darwintrace.dylib: code
>> signing blocked mmap() of
>> '/opt/local/libexec/macports/lib/darwintrace1.0/darwintrace.dylib'
>> /opt/local/libexec/macports/lib/darwintrace1.0/darwintrace.dylib:
>> stat() failed with errno=1
>> dyld: warning: could not load inserted library
>> '/opt/local/libexec/macports/lib/darwintrace1.0/darwintrace.dylib'
>> into library validated process because no suitable image found.  Did
>> find:
>> /opt/local/libexec/macports/lib/darwintrace1.0/darwintrace.dylib: code
>> signing blocked mmap() of
>> '/opt/local/libexec/macports/lib/darwintrace1.0/darwintrace.dylib'
>> /opt/local/libexec/macports/lib/darwintrace1.0/darwintrace.dylib:
>> stat() failed with errno=1
>
> Those are normal in signed binaries. Apple's system integrity protection
> prevents loading the trace mode library into signed processes, unless it
> is also signed (which our copy is not).

Thanks a lot for the precise explanation. This was the first time I
ever saw this kind of warning and it makes sense after your
explanation.

> This usually means that the binary will not run under trace mode, i.e.
> your svn fetch was run without trace mode. In consequence, this means
> that your fetch failure could not have been related to trace mode.

Sure, I fully understood that the final fetch error was unrelated.
Sorry for not making this clear, I just wanted to copy-paste a few
lines before and after.

Thanks a lot,
    Mojca