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Store::getFSAccessor: Do not include the store dir

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Rather than "mounting" the store inside an empty virtual filesystem,
just return the store as a virtual filesystem. This is more modular.

(FWIW, it also supports two long term hopes of mind:

1. More capability-based Nix language mode. I dream of a "super pure
   eval" where you can only use relative path literals (See #8738), and
   any `fetchTree`-fetched stuff + the store are all disjoint (none is
   mounted in another) file systems.

2. Windows, where the store dir may include drive letters, etc., and is
   thus unsuitable to be the prefix of any `CanonPath`s.

)

Co-authored-by: Eelco Dolstra <edolstra@gmail.com>
This commit is contained in:
John Ericson 2025-02-19 18:46:37 -05:00
parent 2455bda91b
commit eb643d034f
18 changed files with 146 additions and 50 deletions
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2
tests/functional/shell.sh
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@ -21,7 +21,7 @@ nix shell -f shell-hello.nix 'hello^*' -c hello2 | grep 'Hello2'
nix shell -f shell-hello.nix hello-symlink -c hello | grep 'Hello World'
# Test that symlinks outside of the store don't work.
expect 1 nix shell -f shell-hello.nix forbidden-symlink -c hello 2>&1 | grepQuiet "is not in the Nix store"
expect 1 nix shell -f shell-hello.nix forbidden-symlink -c hello 2>&1 | grepQuiet "points outside source tree"
# Test that we're not setting any more environment variables than necessary.
# For instance, we might set an environment variable temporarily to affect some