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Substitute flake inputs #3253

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edolstra opened this issue Dec 2, 2019 · 1 comment
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Substitute flake inputs #3253

edolstra opened this issue Dec 2, 2019 · 1 comment
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edolstra commented Dec 2, 2019 •
edited

Substituting flake inputs might be useful because it provides reproducibility of flake inputs via an existing mechanism (namely binary caches).
@edolstra edolstra self-assigned this Dec 2, 2019
@edolstra edolstra mentioned this issue Dec 2, 2019
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Substituting flake inputs cannot work at present because it doesn't provide attributes like revCount and lastModified. So we'd have to store those in the lock file.

@edolstra edolstra changed the title Check whether flake inputs can be substituted Substitute flake inputs Jan 29, 2020
@edolstra edolstra mentioned this issue Jan 29, 2020
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edolstra added a commit that referenced this issue Jan 30, 2020
@edolstra
Add 'nix flake archive' command
3c54e9b 
This copies a flake and all its inputs recursively to a store (e.g. a
binary cache). This is intended to enable long-term reproducibility
for flakes. However this will also require #3253.

Example:

  $ nix flake archive --json --to file:///tmp/my-cache nixops
  {"path":"/nix/store/272igzkgl1gdzmabsjvb2kb2zqbphb3p-source","inputs":{"nixops-aws":{"path":"/nix/store/ybcykw13gr7iq1pzg18iyibbcv8k9q1v-source","inputs":{}},"nixops-hetzner":{"path":"/nix/store/6yn0205x3nz55w8ms3335p2841javz2d-source","inputs":{}},"nixpkgs":{"path":"/nix/store/li3lkr2ajrzphqqz3jj2avndnyd3i5lc-source","inputs":{}}}}

  $ ll /tmp/my-cache
  total 16
  -rw-r--r-- 1 eelco users 403 Jan 30 01:01 272igzkgl1gdzmabsjvb2kb2zqbphb3p.narinfo
  -rw-r--r-- 1 eelco users 403 Jan 30 01:01 6yn0205x3nz55w8ms3335p2841javz2d.narinfo
  -rw-r--r-- 1 eelco users 408 Jan 30 01:01 li3lkr2ajrzphqqz3jj2avndnyd3i5lc.narinfo
  drwxr-xr-x 2 eelco users   6 Jan 30 01:01 nar
  -rw-r--r-- 1 eelco users  21 Jan 30 01:01 nix-cache-info
  -rw-r--r-- 1 eelco users 404 Jan 30 01:01 ybcykw13gr7iq1pzg18iyibbcv8k9q1v.narinfo

Fixes #3336.
edolstra added a commit that referenced this issue Feb 1, 2020
@edolstra
Record TreeInfo in the lock file
b9d64f9 
Necessary for #3253.
edolstra added a commit that referenced this issue Feb 2, 2020
@edolstra
Substitute flake inputs
94a94da 
This improves reproducibility and may be faster than fetching from the
original source (especially for git/hg inputs, but probably also for
github inputs - our binary cache is probably faster than GitHub's
dynamically generated tarballs).

Unfortunately this doesn't work for the top-level flake since even if
we know the NAR hash of the tree, we don't know the other tree
attributes such as revCount and lastModified.

Fixes #3253.
@edolstra edolstra closed this as completed Feb 2, 2020
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