> On Oct. 1, 2015, 6:23 p.m., Jiang Yan Xu wrote:
> > Sorry I haven't chimed in earlier. I made one comment earlier with a 
> > reference to a pending review <https://reviews.apache.org/r/34138/> but 
> > didn't look at the review closely. I also have a ticket 
> > https://issues.apache.org/jira/browse/MESOS-3191 create before.
> > 
> > I have a few questions, just to help me understand the context.
> > 
> > 1) Since the motivation for this util is for computing and verifying docker 
> > image hash, how will we use it? Given that this implementation requires 
> > USE_SSL_SOCKET, do we want to tie the docker provisioner to the 
> > --enable-ssl flag? Or should we create another flag or make `libssl-dev` or 
> > `openssl-devel` a dependency by default? What is the plan?
> > 
> > 2) What's the advantage of using openssl APIs directly? This implementation 
> > is obviously more complex than the alternative 
> > <https://reviews.apache.org/r/34138/>, which simply calls out to a few 
> > widely distributed system binaries on our supported platforms. (sha256sum 
> > sha512sum are part of GNU coreutils while shasum is on every mac). The 
> > linked review needs to address some comments but it's not far from ready 
> > for shipit (it's not a priority for us right now but you can take it if you 
> > like).
> > 
> > Thanks!

Thanks for feedback. To answer your questions:

- We currently depend on SSL for docker remote registry client as thats the 
authentication type we support. The code exposes simple APIs that can be called 
to get digest of a string, file etc. The test file serves as examples of usage.
- The advantage is that we can use the API without spawning a process. Else you 
can image the number of spawns for a docker image with many layers. In short 
efficiency. Another reason is that the review you pointed me to also depends on 
those utils to be available. So we still need a fallback when those utils are 
not available.
- The code is open to adding more fallback implementations that can incorporate 
the method in https://reviews.apache.org/r/34138/. So we can still add those 
fallback. I would see this implementation as a superset and not a replacement 
for the code presented in https://reviews.apache.org/r/34138/.

-jojy


- Jojy


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On Sept. 30, 2015, 8:11 p.m., Jojy Varghese wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/38747/
> -----------------------------------------------------------
> 
> (Updated Sept. 30, 2015, 8:11 p.m.)
> 
> 
> Review request for mesos, Ben Mahler, Gilbert Song, and Timothy Chen.
> 
> 
> Repository: mesos
> 
> 
> Description
> -------
> 
> Added SHA256, SHA512 implementation.
> 
> 
> Diffs
> -----
> 
>   3rdparty/libprocess/Makefile.am c764717d447da39f78a9c74a756e611b63a814e1 
>   3rdparty/libprocess/include/Makefile.am 
> fcc62e99b92b9d2e7ab344e561a06dd6de1fef7e 
>   3rdparty/libprocess/include/process/digest.hpp PRE-CREATION 
>   3rdparty/libprocess/src/tests/CMakeLists.txt 
> a14b5b8fe22d3e75bef3c716ae7865ddaf132927 
>   3rdparty/libprocess/src/tests/digest_tests.cpp PRE-CREATION 
> 
> Diff: https://reviews.apache.org/r/38747/diff/
> 
> 
> Testing
> -------
> 
> make check.
> 
> 
> Thanks,
> 
> Jojy Varghese
> 
>

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