classification
Title: setup.py sdist --format=gztar should use (equivalent of) `gzip -n`
Type: Stage:
Components: Distutils Versions:
process
Status: open Resolution:
Dependencies: Superseder:
Assigned To: Nosy List: dstufft, eric.araujo, zwol
Priority: normal Keywords:

Created on 2019-11-06 20:14 by zwol, last changed 2019-11-06 20:14 by zwol.

Messages (1)
msg356152 - (view) Author: Zack Weinberg (zwol) * Date: 2019-11-06 20:14
Recent versions of the gzip command-line utility have an option `-n` which causes it to omit the FNAME field of the gzip file header, and write out the MTIME field as zero.  Both of these properties are desirable when constructing reproducible build artifacts (see https://reproducible-builds.org/ ).

An sdist tarball is a build artifact and it should be created as reproducibly as possible.  In particular, --format=gztar should behave as-if `gzip -n` were in use.  (The stdlib's gzip module can produce output equivalent to what gzip -n does, but this is not currently documented nor is it accessible via `tarfile`.  Both of those should be easy fixes.  See bug 38725 and bug 38726.)
History
Date User Action Args
2019-11-06 20:14:38zwolcreate