cachix-action does not produce the same drv path as archive tarball

[ryantm]

$ nix-instantiate https://github.com/ryantm/nixpkgs-update/archive/19de4c7ead3189717be6e96611aca161142f5ec3.tar.gz
warning: you did not specify '--add-root'; the result might be removed by the garbage collector
/nix/store/p2mwzzxh3y6vhwx91kj7jbzqr15xz619-nixpkgs-update-0.2.0.drv

but

https://github.com/ryantm/nixpkgs-update/runs/561492466

has

/nix/store/8qvwc5f6adg7yvvkrvm4hfzmhhamkya1-nixpkgs-update-0.2.0

[ryantm]

Maybe this is some good news but even just fetching master vs the specific commit which is master is not reproducible (this is after clearing out my ~/.cache/nix/tarballs dir):

$ nix-instantiate https://github.com/ryantm/nixpkgs-update/archive/master.tar.gz
unpacking 'https://github.com/ryantm/nixpkgs-update/archive/master.tar.gz'...
warning: you did not specify '--add-root'; the result might be removed by the garbage collector
/nix/store/ywgvk8v7m48z6vxlfljl4pv2r3w92na7-nixpkgs-update-0.2.0.drv
$ nix-instantiate https://github.com/ryantm/nixpkgs-update/archive/19de4c7ead3189717be6e96611aca161142f5ec3.tar.gz
unpacking 'https://github.com/ryantm/nixpkgs-update/archive/19de4c7ead3189717be6e96611aca161142f5ec3.tar.gz'...
warning: you did not specify '--add-root'; the result might be removed by the garbage collector
/nix/store/p2mwzzxh3y6vhwx91kj7jbzqr15xz619-nixpkgs-update-0.2.0.drv

[ryantm]

$ nix-diff /nix/store/ywgvk8v7m48z6vxlfljl4pv2r3w92na7-nixpkgs-update-0.2.0.drv /nix/store/p2mwzzxh3y6vhwx91kj7jbzqr15xz619-nixpkgs-update-0.2.0.drv
- /nix/store/ywgvk8v7m48z6vxlfljl4pv2r3w92na7-nixpkgs-update-0.2.0.drv:{out}
+ /nix/store/p2mwzzxh3y6vhwx91kj7jbzqr15xz619-nixpkgs-update-0.2.0.drv:{out}
• The set of input sources do not match:
    - /nix/store/396py519hv9cdx4ifxnavc83gyh5sd13-1xdd9r6bjz4iw4krzd3h3p4dg27c7z6a-master.tar.gz
    + /nix/store/6ihqic1lmp1cbj8gjrc9slgdmhydc10w-8fnb57phjdqkxacv48zbvrmz3q7lps6d-19de4c7ead3189717be6e96611aca161142f5ec3.tar.gz
• The environments do not match:
    src=''
        /nix/store/396ihqic1lmpy51cbj8gjrc9slgdmhv9cydx4ic10w-8fxnb57phjdqkxavcv48zbvrmz3gyh5q7lps6d13-1xdd9r6bjz4iw4krzd3h3pe4c7eadg231897c17zbe6e96611a-mcast161142f5erc3.tar.gz
    ''
$ diff -r /nix/store/396py519hv9cdx4ifxnavc83gyh5sd13-1xdd9r6bjz4iw4krzd3h3p4dg27c7z6a-master.tar.gz /nix/store/6ihqic1lmp1cbj8gjrc9slgdmhydc10w-8fnb57phjdqkxac\
v48zbvrmz3q7lps6d-19de4c7ead3189717be6e96611aca161142f5ec3.tar.gz

[ryantm]

Using builtins.path as suggested by domenkozar fixed the problem where the download from master vs the hash archive were different.

Unfortunately, the cachix-action build is still different. Here is nix-instantiate on my computer:

$ nix-instantiate https://github.com/ryantm/nixpkgs-update/archive/f051b6638ad2b890d501dbfb79900ff14051165d.tar.gz
warning: you did not specify '--add-root'; the result might be removed by the garbage collector
/nix/store/3y44p985lwsjj25b19nsj94sjmz5hr8p-nixpkgs-update-0.2.0.drv

This drv has an out path of

/nix/store/91lrnlnns9pw0vssj9xcdp7c9z2g74yj-nixpkgs-update-0.2.0

The cachix-action log says the result path is:

  /nix/store/mz066jd34cpddlsndwdh3w3l0pkrnl67-nixpkgs-update-0.2.0

[ryantm]

Solved! cachix/cachix-action#36 among other things changed.