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Eelco Dolstra
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46 changed files with 1770 additions and 1155 deletions
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@ -7,17 +7,19 @@ for determining if the results are the same.
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For purposes of demonstration, we'll use the following Nix file,
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`deterministic.nix` for testing:
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let
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inherit (import <nixpkgs> {}) runCommand;
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in {
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stable = runCommand "stable" {} ''
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touch $out
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'';
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unstable = runCommand "unstable" {} ''
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echo $RANDOM > $out
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'';
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}
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```nix
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let
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inherit (import <nixpkgs> {}) runCommand;
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in {
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stable = runCommand "stable" {} ''
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touch $out
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'';
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unstable = runCommand "unstable" {} ''
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echo $RANDOM > $out
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'';
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}
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```
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Additionally, `nix.conf` contains:
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@ -26,10 +28,12 @@ Additionally, `nix.conf` contains:
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where `/etc/nix/my-diff-hook` is an executable file containing:
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#!/bin/sh
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exec >&2
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echo "For derivation $3:"
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/run/current-system/sw/bin/diff -r "$1" "$2"
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```bash
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#!/bin/sh
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exec >&2
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echo "For derivation $3:"
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/run/current-system/sw/bin/diff -r "$1" "$2"
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```
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The diff hook is executed by the same user and group who ran the build.
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However, the diff hook does not have write access to the store path just
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@ -43,44 +47,55 @@ to the build command.
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If the build passes and is deterministic, Nix will exit with a status
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code of 0:
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$ nix-build ./deterministic.nix -A stable
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this derivation will be built:
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/nix/store/z98fasz2jqy9gs0xbvdj939p27jwda38-stable.drv
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building '/nix/store/z98fasz2jqy9gs0xbvdj939p27jwda38-stable.drv'...
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/nix/store/yyxlzw3vqaas7wfp04g0b1xg51f2czgq-stable
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$ nix-build ./deterministic.nix -A stable --check
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checking outputs of '/nix/store/z98fasz2jqy9gs0xbvdj939p27jwda38-stable.drv'...
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/nix/store/yyxlzw3vqaas7wfp04g0b1xg51f2czgq-stable
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```console
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$ nix-build ./deterministic.nix -A stable
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this derivation will be built:
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/nix/store/z98fasz2jqy9gs0xbvdj939p27jwda38-stable.drv
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building '/nix/store/z98fasz2jqy9gs0xbvdj939p27jwda38-stable.drv'...
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/nix/store/yyxlzw3vqaas7wfp04g0b1xg51f2czgq-stable
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$ nix-build ./deterministic.nix -A stable --check
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checking outputs of '/nix/store/z98fasz2jqy9gs0xbvdj939p27jwda38-stable.drv'...
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/nix/store/yyxlzw3vqaas7wfp04g0b1xg51f2czgq-stable
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```
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If the build is not deterministic, Nix will exit with a status code of
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1:
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$ nix-build ./deterministic.nix -A unstable
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this derivation will be built:
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/nix/store/cgl13lbj1w368r5z8gywipl1ifli7dhk-unstable.drv
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building '/nix/store/cgl13lbj1w368r5z8gywipl1ifli7dhk-unstable.drv'...
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/nix/store/krpqk0l9ib0ibi1d2w52z293zw455cap-unstable
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$ nix-build ./deterministic.nix -A unstable --check
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checking outputs of '/nix/store/cgl13lbj1w368r5z8gywipl1ifli7dhk-unstable.drv'...
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error: derivation '/nix/store/cgl13lbj1w368r5z8gywipl1ifli7dhk-unstable.drv' may not be deterministic: output '/nix/store/krpqk0l9ib0ibi1d2w52z293zw455cap-unstable' differs
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```console
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$ nix-build ./deterministic.nix -A unstable
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this derivation will be built:
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/nix/store/cgl13lbj1w368r5z8gywipl1ifli7dhk-unstable.drv
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building '/nix/store/cgl13lbj1w368r5z8gywipl1ifli7dhk-unstable.drv'...
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/nix/store/krpqk0l9ib0ibi1d2w52z293zw455cap-unstable
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$ nix-build ./deterministic.nix -A unstable --check
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checking outputs of '/nix/store/cgl13lbj1w368r5z8gywipl1ifli7dhk-unstable.drv'...
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error: derivation '/nix/store/cgl13lbj1w368r5z8gywipl1ifli7dhk-unstable.drv' may
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not be deterministic: output '/nix/store/krpqk0l9ib0ibi1d2w52z293zw455cap-unstable' differs
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```
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In the Nix daemon's log, we will now see:
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For derivation /nix/store/cgl13lbj1w368r5z8gywipl1ifli7dhk-unstable.drv:
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1c1
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< 8108
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---
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> 30204
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```
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For derivation /nix/store/cgl13lbj1w368r5z8gywipl1ifli7dhk-unstable.drv:
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1c1
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< 8108
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---
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> 30204
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```
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Using `--check` with `--keep-failed` will cause Nix to keep the second
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build's output in a special, `.check` path:
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$ nix-build ./deterministic.nix -A unstable --check --keep-failed
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checking outputs of '/nix/store/cgl13lbj1w368r5z8gywipl1ifli7dhk-unstable.drv'...
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note: keeping build directory '/tmp/nix-build-unstable.drv-0'
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error: derivation '/nix/store/cgl13lbj1w368r5z8gywipl1ifli7dhk-unstable.drv' may not be deterministic: output '/nix/store/krpqk0l9ib0ibi1d2w52z293zw455cap-unstable' differs from '/nix/store/krpqk0l9ib0ibi1d2w52z293zw455cap-unstable.check'
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```console
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$ nix-build ./deterministic.nix -A unstable --check --keep-failed
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checking outputs of '/nix/store/cgl13lbj1w368r5z8gywipl1ifli7dhk-unstable.drv'...
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note: keeping build directory '/tmp/nix-build-unstable.drv-0'
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error: derivation '/nix/store/cgl13lbj1w368r5z8gywipl1ifli7dhk-unstable.drv' may
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not be deterministic: output '/nix/store/krpqk0l9ib0ibi1d2w52z293zw455cap-unstable' differs
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from '/nix/store/krpqk0l9ib0ibi1d2w52z293zw455cap-unstable.check'
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```
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In particular, notice the
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`/nix/store/krpqk0l9ib0ibi1d2w52z293zw455cap-unstable.check` output. Nix
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@ -102,7 +117,8 @@ has copied the build results to that directory where you can examine it.
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already. If the derivation has not been built Nix will fail with the
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error:
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error: some outputs of '/nix/store/hzi1h60z2qf0nb85iwnpvrai3j2w7rr6-unstable.drv' are not valid, so checking is not possible
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error: some outputs of '/nix/store/hzi1h60z2qf0nb85iwnpvrai3j2w7rr6-unstable.drv'
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are not valid, so checking is not possible
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Run the build without `--check`, and then try with `--check` again.
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@ -130,10 +146,12 @@ reproducibly:
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An example output of this configuration:
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$ nix-build ./test.nix -A unstable
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this derivation will be built:
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/nix/store/ch6llwpr2h8c3jmnf3f2ghkhx59aa97f-unstable.drv
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building '/nix/store/ch6llwpr2h8c3jmnf3f2ghkhx59aa97f-unstable.drv' (round 1/2)...
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building '/nix/store/ch6llwpr2h8c3jmnf3f2ghkhx59aa97f-unstable.drv' (round 2/2)...
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output '/nix/store/6xg356v9gl03hpbbg8gws77n19qanh02-unstable' of '/nix/store/ch6llwpr2h8c3jmnf3f2ghkhx59aa97f-unstable.drv' differs from '/nix/store/6xg356v9gl03hpbbg8gws77n19qanh02-unstable.check' from previous round
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/nix/store/6xg356v9gl03hpbbg8gws77n19qanh02-unstable
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```console
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$ nix-build ./test.nix -A unstable
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this derivation will be built:
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/nix/store/ch6llwpr2h8c3jmnf3f2ghkhx59aa97f-unstable.drv
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building '/nix/store/ch6llwpr2h8c3jmnf3f2ghkhx59aa97f-unstable.drv' (round 1/2)...
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building '/nix/store/ch6llwpr2h8c3jmnf3f2ghkhx59aa97f-unstable.drv' (round 2/2)...
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output '/nix/store/6xg356v9gl03hpbbg8gws77n19qanh02-unstable' of '/nix/store/ch6llwpr2h8c3jmnf3f2ghkhx59aa97f-unstable.drv' differs from '/nix/store/6xg356v9gl03hpbbg8gws77n19qanh02-unstable.check' from previous round
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/nix/store/6xg356v9gl03hpbbg8gws77n19qanh02-unstable
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```
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