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The program takes populate's arguments on its command line, like other
programs: populate [OPTION]... SOURCES [TARGET], with the sources as
JSON in the file SOURCES, or on standard input for -. TARGET has the
syntax of krops' lib's mkTarget, [USER@][HOST][:PORT][PATH], parsed the
same way, and what it leaves out gets filled in when populate runs, as
mkTarget would, from LOGNAME and the machine's name. Options set what
the syntax can't express, or override its parts: --sudo, --ssh-arg,
--user, --host, --port, --path, and --local or --remote for whether the
target is the machine populate runs on, which populate otherwise
decides like isLocalTarget. The sources carry no version.
pkgs.populate passes a target attribute set, as mkTarget returns it,
part by part, with --local or --remote as evaluation decides, so
nothing changes for krops. A target string goes to the program as it
is.
The program also refuses target hosts and users starting with -, which
ssh would take for options, now that a command line can give them.
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The shell implementation runs under set -e, so it exits with the status
of the command that failed, e.g. 255 if ssh can't reach the target,
which wrappers retrying on connection failures rely on, or 128 if git
fetch fails. The program does the same, instead of exiting with 1, and
with 128 plus the signal for a command a signal ended.
A phase's expect.status is the exit status it expects populate to fail
with; git-status checks git fetch's.
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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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pkgs.populate takes implementation: "shell", the default, generates a
script from populate's arguments, and "rust" passes them as JSON to the
program in pkgs/populate, built from the crate there by program.nix.
The program checks the spec as checks.nix does during evaluation, with the
same messages, and reports that delivering sources isn't implemented yet.
rustProgram replaces the program, e.g. with one built some other way.
checks.nix holds the checks of populate's arguments during evaluation.
Both implementations check the names of sources and the target path with
it, and the Rust one's wrapper also checks drawing inputs, which the shell
implementation checks where it draws them.
nix-build tests --argstr implementation rust runs the scenarios with the
Rust implementation. They expect it to refuse copying flakes to targets
using sudo when it runs, not during evaluation, because only then it
decides whether the target is local.
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