Respect SOURCE_DATE_EPOCH when taring sdist. #2136
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This is great. Thanks for putting this together. I would recommend one change to your approach - if you could separate the commits of (a) copying code from distutils from (b) tweaking that code, it will make it easier to later reconcile any differences that might need to be merged from the original. As is, if I try to review this, I can't tell what functionality was copied and what was changed. If you can separate those changes in the commit history, I'm pretty sure the changes here are acceptable. As a side note, there is a larger effort to incorporate all of distutils, which if implemented would have made this change more straightforward. |
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Yes, I can do this, no problem. The one issue though will be flake 8 will complain about the raw |
function copy-pasted as is from cpython Lib/distutils/archive_utils.py 2602d97a0ae92b2d320909024e901c202b003e14 as of May 25 2020. Add relevant import at top of file as well
This pulls just enough of distutils' and modify the make_tarball function in order to respect SOURCE_DATE_EPOCH; this will ensure that _when set_ no timestamp in the final archive is greater than timestamp. This allows (but is not always sufficient), to make bytes for bytes reproducible build for example: - This does not work with `gztar`, and zip does embed a timestamp in the header which currently is `time.time()` in the standard library. - if some fields passed to setup.py have on determinstic ordering (for example using sets for dependencies). Partial work toward pypa#2133, with this I was able to make two bytes-identical sdist of IPython. You will see three types of modifications: - Referring explicitly to some of distutils namespace in a couple of places, to avoid duplicating more code. Note that despite some names _not_ changing as the name resolution is with respect to current module, unchanged functions will now use our modified version. - overwrite `make_archive` in sdist to use our patched version of the functions in archive_utils. - update make_tarball to look for SOURCE_DATE_EPOCH in environment and setup a filter to modify mtime while taring.
Carreau
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Force-pushed with proper commit descriptions. I'd appreciate a pointer to a test that check a tar (not tar.gz as those are not yet reproducible), and can modify it to make sure the hash can be reproduced. |
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Have you checked #1512? |
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I have not, but thanks, you definitely found the same issues that I did, though I went for much smaller and only tackle the minimal amount in one PR. I'll likely get inspiration from your tests. |
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Any update on this? |
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@Carreau From your last comment, it wasn't clear to me whether you wanted to do more work on this or not. Can you clarify what the status is of this request? |
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I'm closing this for now, but happy to revive the effort at any point. |
This pulls just enough of distutils' and modify the make_tarball
function in order to respect SOURCE_DATE_EPOCH; this will ensure that
when set no timestamp in the final archive is greater than timestamp.
This allows (but is not always sufficient), to make bytes for bytes
reproducible build for example:
This does not work with
gztar, and zip does embed a timestamp inthe header which currently is
time.time()in the standard library.if some fields passed to setup.py have on determinstic ordering (for
example using sets for dependencies).
Partial work toward #2133, with this I was able to make two bytes-identical
sdist of IPython.
Summary of changes
pull many function as-is from distutils with the exception of make_tarball to which a couple of lines are added.
Pull Request Checklist
No tests yet, nor changelog, I want to make sure this is the right approach first.