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Doc: improve python bdist_wheel fix

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This commit is contained in:
Frederik Rietdijk 2016-08-30 17:16:13 +02:00
parent e561edc322
commit 850e6287c5
1 changed files with 8 additions and 4 deletions
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12
doc/languages-frameworks/python.md
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@ -767,21 +767,25 @@ in newpkgs.python27.withPackages (ps: [ps.django_guardian ])
### `python setup.py bdist_wheel` cannot create .whl
Executing `python setup.py bdist_wheel` fails with
Executing `python setup.py bdist_wheel` in a `nix-shell `fails with
```
ValueError: ZIP does not support timestamps before 1980
```
This is because files are included that depend on items in the Nix store which have a timestamp of, that is, it corresponds to January the 1st, 1970 at 00:00:00. And as the error informs you, ZIP does not support that.
Fortunately `bdist_wheel` takes into account `SOURCE_DATE_EPOCH`. On Nix this value is set to 1. By setting it to a value correspond to 1980 or later it is possible to build wheels.
The command `bdist_wheel` takes into account `SOURCE_DATE_EPOCH`, and `nix-shell` sets this to 1. By setting it to a value corresponding to 1980 or later, or by unsetting it, it is possible to build wheels.
Use 1980 as timestamp:
```
SOURCE_DATE_EPOCH=315532800 python3 setup.py bdist_wheel
nix-shell --run "SOURCE_DATE_EPOCH=315532800 python3 setup.py bdist_wheel"
```
or the current time:
```
SOURCE_DATE_EPOCH=$(date +%s) python3 setup.py bdist_wheel
nix-shell --run "SOURCE_DATE_EPOCH=$(date +%s) python3 setup.py bdist_wheel"
```
or unset:
"""
nix-shell --run "unset SOURCE_DATE_EPOCH; python3 setup.py bdist_wheel"
"""
### `install_data` / `data_files` problems