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Merge pull request #12351 from meeseeksmachine/auto-backport-of-pr-12…
…347-on-7.x Backport PR #12347 on branch 7.x (What's new in 7.15+ Reproducible build working)
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Original file line number | Diff line number | Diff line change |
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""" | ||
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import subprocess | ||
import os | ||
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from toollib import cd, sh | ||
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Original file line number | Diff line number | Diff line change |
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""" | ||
Un-targz and retargz a targz file to ensure reproducible build. | ||
usage: | ||
$ export SOURCE_DATE_EPOCH=$(date +%s) | ||
... | ||
$ python retar.py <tarfile.gz> | ||
The process of creating an sdist can be non-reproducible: | ||
- directory created during the process get a mtime of the creation date; | ||
- gziping files embed the timestamp of fo zip creation. | ||
This will untar-retar; ensuring that all mtime > SOURCE_DATE_EPOCH will be set | ||
equal to SOURCE_DATE_EPOCH. | ||
""" | ||
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import tarfile | ||
import sys | ||
import os | ||
import gzip | ||
import io | ||
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if len(sys.argv) > 2: | ||
raise ValueError("Too many arguments") | ||
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timestamp = int(os.environ["SOURCE_DATE_EPOCH"]) | ||
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old_buf = io.BytesIO() | ||
with open(sys.argv[1], "rb") as f: | ||
old_buf.write(f.read()) | ||
old_buf.seek(0) | ||
old = tarfile.open(fileobj=old_buf, mode="r:gz") | ||
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buf = io.BytesIO() | ||
new = tarfile.open(fileobj=buf, mode="w", format=tarfile.GNU_FORMAT) | ||
for i, m in enumerate(old): | ||
data = None | ||
# mutation does not work, copy | ||
if m.name.endswith('.DS_Store'): | ||
continue | ||
m2 = tarfile.TarInfo(m.name) | ||
m2.mtime = min(timestamp, m.mtime) | ||
m2.size = m.size | ||
m2.type = m.type | ||
m2.linkname = m.linkname | ||
if m.isdir(): | ||
data = old.extractfile(m) | ||
new.addfile(m2, data) | ||
else: | ||
new.addfile(m2) | ||
new.close() | ||
old.close() | ||
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buf.seek(0) | ||
with open(sys.argv[1], "wb") as f: | ||
with gzip.GzipFile('', "wb", fileobj=f, mtime=timestamp) as gzf: | ||
gzf.write(buf.read()) |