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DerivedState::parse reads what derived_state prints, and key_text
builds the text whose hash is a derived copy's key, the same as before,
both with unit tests, instead of decoding fields by position inside
Flakes::derive. Fields from the target that don't end in a null byte
fail, instead of getting dropped.
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Writing the lock file of a git+file: flake, Nix runs Git, with the
repository's configuration and hooks, which may run commands. A .git
in a source's directory can come from anywhere, e.g. one planted in a
materialized flake, or one a file source keeps. So drawing inputs
refers to a flake as git+file: only if git_problems finds nothing wrong
with its .git directory, the way git sources check their work trees,
and else as path:.
lock-foreign-git plants a .git in a materialized flake and in a file
source that keeps it, whose configuration names an fsmonitor command.
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The program needs Rust 1.71, the oldest version its dependencies support,
which Cargo.toml states, so clippy points out what newer versions add.
The lock file is of version 3, which Cargo reads from version 1.53 on.
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The program decides how to draw inputs and derive copies of flake and
flake-input sources itself. The target runs fixed snippets, which send
back what it needs to know: where paths resolve to and what's there, the
lock files of flakes as nix flake metadata prints them, and what tells
whether a derived copy needs to be made again. The program checks that
drawn inputs exist in the lock files, computes the keys of derived
copies, and writes generated flakes.
Derived copies get the same keys as with the shell implementation, so
switching implementations doesn't make them again.
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src/flake_input.rs reads what nix flake metadata and nix flake archive
print as JSON itself: it selects the flake or input, decides what the
target fetches or gets copied, and computes the store paths to root,
which are what selected.jq, selfIsRemote.jq, selfLocked.jq, and the Nix
expressions of the shell implementation do there. On the target, fixed
snippets in sh::flake run Nix, getting values as positional parameters,
and send JSON or store paths back. The jq test's cases are unit tests of
the Rust equivalents.
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The program delivers flake and flake-input sources, draws inputs from
sources, and removes state that sources don't need anymore, so it does
everything the shell implementation does, and passes all scenarios.
src/flake.rs builds the same shell code as shell.nix generates for
these, with every value quoted, so both implementations behave alike
while that code moves to Rust piece by piece.
The ssh scripts in the temporary directory run the ssh that was in PATH
when populate started, so one can be ssh in PATH for nix copy. The
other one is for nix copy's ssh:// store, without the control socket.
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