This allows a flake to specify that it needs Git submodules to be
enabled (or disabled, if we ever change the default) on the top-level
flake. This requires the input to be refetched, but since the first
fetch is lazy, this shouldn't be expensive.
Currently the only attribute allowed by `inputs.self` is `submodules`,
but more can be added in the future (e.g. a `lazy` attribute to opt in
to lazy tree behaviour).
Fixes#5312, #9842.
Since ff8e2fe84e, 'path:' URLs on the
CLI are interpreted as relative to the current directory of the user,
not the path of the flake we're overriding.
This allows writing lock files with dirty inputs, so long as they have
a NAR hash. (Currently they always have a NAR hash, but with lazy
trees that may not always be the case.)
Generally dirty locks are bad for reproducibility (we can detect if
the dirty input has changed, but we have no way to fetch it except
substitution). Hence we don't allow them by default.
Fixes#11181.
Commands like `nix flake metadata '.?submodules=1'` ignored the query
part of the URL, while `nix build '.?submodules=1#foo'` did work
correctly because of the presence of the fragment part.
This may occur when stderr is a tty but stdin is empty.
E.g.
$ nix build </dev/null
error: unexpected EOF reading a line
These stdio handles are how some non-interactive sandboxes behave,
including the Nix build sandbox and Hercules CI Effects.
Relative path flakes ("subflakes") are basically fundamentally
broken, since they produce lock file entries like
"locked": {
"lastModified": 1,
"narHash": "sha256-/2tW9SKjQbRLzfcJs5SHijli6l3+iPr1235zylGynK8=",
"path": "./flakeC",
"type": "path"
},
that don't specify what "./flakeC" is relative to. They *sometimes*
worked by accident because the `narHash` field allowed
`fetchToStore()` to get the store path of the subflake *if* it
happened to exist in the local store or in a substituter.
Subflakes are properly fixed in #10089 (which adds a "parent" field to
the lock file). Rather than come up with some crazy hack to make them
work in the interim, let's just disable the only test that depends on
the broken behaviour for now.
Fixes
$ nix flake metadata --store /tmp/nix nixpkgs
error: path '/tmp/nix/nix/store/65xpqkz92d9j7k5ric4z8lzhiigxsfbg-source/flake.nix' is not in the Nix store
This has been broken since 598deb2b23.
