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Backport #11610 to 2.19 maintenance #11693

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@roberth roberth commented Oct 14, 2024

puckipedia and others added 6 commits October 14, 2024 15:15
This patch has been manually adapted from
lix-project/lix@14dc84e

Tested with:

$ NIX_SSL_CERT_FILE=$(nix-build '<nixpkgs>' -A cacert)/etc/ssl/certs/ca-bundle.crt nix-build --store $(mktemp -d) -E 'import <nix/fetchurl.nix> { url = https://google.com; }'
warning: found empty hash, assuming 'sha256-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA='
this derivation will be built:
  /nix/store/4qljhy0jj2b0abjzpsbyarpia1bqylwc-google.com.drv
building '/nix/store/4qljhy0jj2b0abjzpsbyarpia1bqylwc-google.com.drv'...
error:
       … writing file '/nix/store/0zynn4n8yx59bczy1mgh1lq2rnprvvrc-google.com'

       error: unable to download 'https://google.com': Problem with the SSL CA cert (path? access rights?) (77)
error: builder for '/nix/store/4qljhy0jj2b0abjzpsbyarpia1bqylwc-google.com.drv' failed with exit code 1

Now returns:

nix-env % NIX_SSL_CERT_FILE=$(nix-build '<nixpkgs>' -A cacert)/etc/ssl/certs/ca-bundle.crt nix-build --store $(mktemp -d) -E 'import <nix/fetchurl.nix> { url = https://google.com; }'
this derivation will be built:
  /nix/store/4qljhy0jj2b0abjzpsbyarpia1bqylwc-google.com.drv
building '/nix/store/4qljhy0jj2b0abjzpsbyarpia1bqylwc-google.com.drv'...
error: hash mismatch in fixed-output derivation '/nix/store/4qljhy0jj2b0abjzpsbyarpia1bqylwc-google.com.drv':
         specified: sha256-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=
            got:    sha256-5xXEhGtnRdopaUTqaz2M1o2NE7ovhU0SjcSOPwntqwY=

(cherry picked from commit 1fbdf40)
#10456 fixed the addition of symlink
store paths to the sandbox, but also made it so that the hardcoded
sandbox paths (like `/etc/hosts`) were now bind-mounted without
following the possible symlinks. This made these files unreadable if
there were symlinks (because the sandbox would now contain a symlink to
an unreachable file rather than the underlying file).
In particular, this broke FOD derivations on NixOS as `/etc/hosts` is a
symlink there.

Fix that by canonicalizing all these hardcoded sandbox paths before
adding them to the sandbox.

(cherry picked from commit acbb152)
@github-actions github-actions bot added the with-tests Issues related to testing. PRs with tests have some priority label Oct 14, 2024
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This pull request has been mentioned on NixOS Discourse. There might be relevant details there:

https://discourse.nixos.org/t/2024-10-14-nix-team-meeting-minutes-186/54352/1

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