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Remove nix-build --hash

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Instead, if a fixed-output derivation produces has an incorrect output
hash, we now unconditionally move the outputs to the path
corresponding with the actual hash and register it as valid. Thus,
after correcting the hash in the Nix expression (e.g. in a fetchurl
call), the fixed-output derivation doesn't have to be built again.

It would still be good to have a command for reporting the actual hash
of a fixed-output derivation (instead of throwing an error), but
"nix-build --hash" didn't do that.
This commit is contained in:
Eelco Dolstra 2018-02-03 10:04:29 +01:00
parent de96daf54f
commit 84722d67d2
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GPG key ID: 8170B4726D7198DE
6 changed files with 43 additions and 33 deletions
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10
doc/manual/release-notes/rl-2.0.xml
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@ -99,11 +99,11 @@
</listitem>
<listitem>
<para>New build mode <command>nix-build --hash</command> that
builds a derivation, computes the hash of the output, and moves
the output to the store path corresponding to what a fixed-output
derivation with that hash would produce.
(Add docs and examples; see d367b8e7875161e655deaa96bf8a5dd0bcf8229e)</para>
<para>If a fixed-output derivation produces a result with an
incorrect hash, the output path will be moved to the location
corresponding to the actual hash and registered as valid. Thus, a
subsequent build of the fixed-output derivation with the correct
hash is unnecessary.</para>
</listitem>
<listitem>