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Only provide builtin.{getFlake,fetchClosure} is the corresponding experimental feature is enabled

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This allows writing fallback code like

  if builtins ? fetchClosure then
    builtins.fetchClose { ... }
  else
    builtins.storePath ...
This commit is contained in:
Eelco Dolstra 2022-03-25 14:04:18 +01:00
parent 55bc524019
commit 86b05ccd54
8 changed files with 31 additions and 39 deletions
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9
doc/manual/src/release-notes/rl-next.md
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@ -5,9 +5,12 @@
* `nix store make-content-addressable` has been renamed to `nix store
make-content-addressed`.
* New builtin function `builtins.fetchClosure` that copies a closure
from a binary cache at evaluation time and rewrites it to
content-addressed form (if it isn't already). Like
* New experimental builtin function `builtins.fetchClosure` that
copies a closure from a binary cache at evaluation time and rewrites
it to content-addressed form (if it isn't already). Like
`builtins.storePath`, this allows importing pre-built store paths;
the difference is that it doesn't require the user to configure
binary caches and trusted public keys.
This function is only available if you enable the experimental
feature `fetch-closure`.