On Thu, 07 Sep 2017 14:08:58 -0700 Benjamin Peterson <benjamin at python.org> wrote: > On Thu, Sep 7, 2017, at 14:00, Antoine Pitrou wrote: > > On Thu, 07 Sep 2017 13:39:21 -0700 > > Benjamin Peterson <benjamin at python.org> wrote: > > > Hello, > > > I've written a short PEP about an import extension to allow pycs to be > > > more deterministic by optional replacing the timestamp with a hash of > > > the source file: https://www.python.org/dev/peps/pep-0552/ > > > > Why isn't https://github.com/python/cpython/pull/296 a good enough > > solution to this problem? It has a simple implementation, and requires > > neither maintaining two different pyc formats nor reading the entire > > source file to check whether the pyc file is up to date. > > The main objection to that model is that it requires modifying source > timestamps, which isn't possible for builds on read-only source trees. Not sure how common that situation is (certainly the source tree wasn't read-only when you checked it out or untar'ed it), but isn't it easily circumvented by copying the source tree before building? > This proposal also allows reproducible builds even if the files are > being modified in an edit-run-tests cycle. I don't follow you here. Could you elaborate? Thanks Antoine.
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