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A pipe source's command is an absolute path, which a shell runs as a
script if it isn't a program, e.g. lacks #!. The program ran it
directly, which fails for such a command.
pipe-script runs a pipe command without #!.
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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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The program delivers derivation, file, git, pass, passage, pipe, and
symlink sources, makes backups, and prunes, as the shell implementation
does, with the same messages. Commands on the target are fixed shell
snippets in src/sh.rs, which get values as positional parameters, run
directly for local targets and over ssh, sharing one master connection,
for remote ones. rsync's transfers and its check for .rsync-filter files
it can't read are in src/rsync.rs. Given flake or flake-input sources, or
sources drawing inputs from others, the program fails before changing
anything, saying that these aren't implemented yet.
SIGHUP, SIGINT, and SIGTERM make populate stop once the command it waits
for ends, stop the ssh master, remove its temporary directory, and exit
with 128 plus the signal's number.
The spec's target gets local, which rust.nix sets during evaluation, like
the other functions of krops decide, and which the program decides when
it runs if it's null. The spec comes on file descriptor 3, so the
commands populate runs keep standard input, and the tools populate runs
come first in PATH.
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