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git sources refused work trees with hooks, but populate's Git doesn't
run hooks, so git-foreign's work tree with a hook is fine to use, as it
expects. Only Nix's Git runs them, in a git+file: flake, so drawing
inputs refers to a work tree with hooks as path: instead.
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The program checks that each source's settings are those
lib/types/populate.nix defines for its type, with values of the kinds
it defines, for specs from elsewhere than default.nix: a misspelt
setting fails, as design.md promises, instead of being ignored, and so
does a setting the program would treat as its default because of its
kind. This subsumes the check of absolute paths.
ln gets a symlink source's target after --, so it can't be taken for an
option either.
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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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git submodule update uses the .git of a submodule as it finds it in the
work tree: a repository of its own, with configuration that runs
commands, or a file naming a repository elsewhere. So git_problems
also requires each .git below the work tree to be a file naming a
repository in .git/modules. And it refuses hooks in .git/hooks, which
populate's Git doesn't run, but Nix's does, writing the lock file of a
flake in a git source.
git-submodule plants a submodule's .git in the work tree: a repository
of its own whose configuration names a filter, and a file naming a
repository elsewhere. The fixture withsub has gitsrc as its submodule
sub.
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A git source's url and ref are strings, and git clone, git remote, and
git fetch took ones starting with - for options, e.g. --upload-pack,
which runs a command where the repository is local. They come after
-- now, and so does a pass source's name for git log and pass show.
git-ref-option gives a ref that git fetch would take for
--upload-pack.
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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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