[Nix-dev] changing the default source epoch to be zip-safe

[Daniel Hlynskyi]

still, why 1.1.1970? One of @edolstra's commits introduced algorithm, that
sets source epoch time to most recent source change date. Wouldn't that be
better date for /nix/store? Currently datetime in /nix/store carries zero
information.

Also, I'd like to notice that non-epoch-starttime files do exist in my
store, probably created in nix-shell or nix-build:

[danbst at LX:~]$ ls -ld /nix/store/* | grep -v "Jan  1  1970"
drwxr-xr-x  3 nixbld1 nixbld      4096 Aug  5 23:26
/nix/store/7iv1251a6g03m5jjqazd5rfmbqsz67nc-nixos-shell
drwxr-xr-x  6 root    root        4096 Aug  8 05:03
/nix/store/pb6papnlgg62wkim7qsg8c2jw4izffx8-glibc-2.21
-rw-------  1 root    root           0 Aug  4 22:29
/nix/store/30q3vgn6p6abfz4xbs47v11wcikf9dqr-plasma-desktop-5.7.2.lock
-rw-------  1 root    root           0 Aug  1 06:03
/nix/store/59cp809rmyh12p800sln490yr0f93nx7-four-color-theorem-proof.lock
-rw-------  1 root    root           0 Aug  5 23:26
/nix/store/7iv1251a6g03m5jjqazd5rfmbqsz67nc-nixos-shell.lock
-rw-------  1 root    root           0 Aug  4 00:15
/nix/store/jv2drjhj8h0blz4lza6xsnraalsvhaf9-munin-2.999.2.lock
-rw-------  1 root    root           0 Aug  4 22:29
/nix/store/jxkj59ppkpna1xlmpjzdbxqzw49gbgif-plasma-desktop-5.7.2-dev.lock
-rw-------  1 root    root           0 Aug  8 05:03
/nix/store/pb6papnlgg62wkim7qsg8c2jw4izffx8-glibc-2.21.lock
-rw-------  1 root    root           0 Jul 31 23:24
/nix/store/v07q9f5k730czvabfzilnsnahdbk19hx-four-color-theorem-src.lock
-rw-------  1 root    root           0 Aug  4 21:58
/nix/store/vfgv4b1rgm1hkamqczmyals8s66gvq8k-ati-drivers-15.12-4.4.16.lock
-rw-------  1 root    root           0 Aug  9 03:47
/nix/store/y9asyqxygq39lkmc98cmbqsja5yynwd0-ruby-2.3.1-p0.lock
-rw-------  1 root    root           0 Aug  1 00:20
/nix/store/zlpqh99xfxqvwcwzj0hly2d07x84whz9-coq-8.3pl4.lock


2016-08-20 12:11 GMT+00:00 Vladimír Čunát <vcunat at gmail.com>:

> On 08/14/2016 04:13 PM, Ronny Pfannschmidt wrote:
> > on nix it is a regular problem for me that zip file generating tools fail
> > due to the epoch time being set to a time that's not supported in the
> > zip format
> > (mostly python wheels)
> >
> > i would like to propose setting that epoch by default to something that
> > is supported by zip
>
> We discussed that zip problems aren't that bad to change timestamps of
> /nix/store paths directly (1.1. 1970).
>
> For python and similar we have a hook that touches source files after
> "unpacking" phase - the typical problem is after fetch* other than
> fetchurl. Typical usage:
>   buildInputs = [ (ensureNewerSourcesHook { year = "1980"; }) ]
>
> Note that our generic python builder already does use the hook
> automatically.
>
> --Vladimir
>
>
>
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