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Remove repeat and enforce-determinism options

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These only functioned if a very narrow combination of conditions held:

- The result path does not yet exist (--check did not result in
  repeated builds), AND
- The result path is not available from any configured substituters, AND
- No remote builders that can build the path are available.

If any of these do not hold, a derivation would be built 0 or 1 times
regardless of the repeat option. Thus, remove it to avoid confusion.
This commit is contained in:
Linus Heckemann 2022-09-26 20:55:56 +02:00
parent 54906bc93c
commit 8e0946e8df
12 changed files with 21 additions and 153 deletions
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34
doc/manual/src/advanced-topics/diff-hook.md
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@ -121,37 +121,3 @@ error:
are not valid, so checking is not possible
Run the build without `--check`, and then try with `--check` again.
# Automatic and Optionally Enforced Determinism Verification
Automatically verify every build at build time by executing the build
multiple times.
Setting `repeat` and `enforce-determinism` in your `nix.conf` permits
the automated verification of every build Nix performs.
The following configuration will run each build three times, and will
require the build to be deterministic:
enforce-determinism = true
repeat = 2
Setting `enforce-determinism` to false as in the following
configuration will run the build multiple times, execute the build
hook, but will allow the build to succeed even if it does not build
reproducibly:
enforce-determinism = false
repeat = 1
An example output of this configuration:
```console
$ nix-build ./test.nix -A unstable
this derivation will be built:
/nix/store/ch6llwpr2h8c3jmnf3f2ghkhx59aa97f-unstable.drv
building '/nix/store/ch6llwpr2h8c3jmnf3f2ghkhx59aa97f-unstable.drv' (round 1/2)...
building '/nix/store/ch6llwpr2h8c3jmnf3f2ghkhx59aa97f-unstable.drv' (round 2/2)...
output '/nix/store/6xg356v9gl03hpbbg8gws77n19qanh02-unstable' of '/nix/store/ch6llwpr2h8c3jmnf3f2ghkhx59aa97f-unstable.drv' differs from '/nix/store/6xg356v9gl03hpbbg8gws77n19qanh02-unstable.check' from previous round
/nix/store/6xg356v9gl03hpbbg8gws77n19qanh02-unstable
```