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//! Delivering the sources of a spec.
use crate::flake;
use crate::flake_input;
use crate::rsync::{self, Config};
use crate::run::{self, Context, Failure, Result};
use crate::sh;
use crate::spec::{Source, Spec};
use serde_json::{Map, Value};
use std::fs;
use std::path::PathBuf;
use std::process::Command;
/// Checks the sentinel, makes a backup if asked, delivers each source, and
/// prunes if asked.
pub fn populate(context: &Context, spec: &Spec) -> Result<()> {
let dir = &spec.target.path;
refuse_copying_with_sudo(context, spec)?;
let sentinel = format!("{dir}/.populate");
let force = if spec.force { "1" } else { "" };
context.run(
sh::CHECK,
&[&sentinel, &context.name(&sentinel), dir, force],
)?;
if spec.backup {
context.run(&sh::backup(), &[dir, &context.name(&sentinel)])?;
}
for (name, source) in &spec.source {
let path = format!("{dir}/{name}");
eprintln!("populating '{}'...", context.name(&path));
let workdir = context.tmpdir.join("workdirs").join(name);
fs::create_dir_all(&workdir).map_err(|e| {
Failure::Message(format!("error: can't create {}: {e}", workdir.display()))
})?;
deliver(context, name, source, &path, workdir)?;
}
flake::flakes(context, dir, &spec.source)?;
if spec.prune {
let flakes = spec
.source
.iter()
.filter(|(_, source)| matches!(source.kind.as_str(), "flake" | "flake-input"))
.map(|(name, _)| name.as_str());
let mut args = vec![dir.as_str()];
let log = context.name(dir);
args.push(&log);
args.extend(spec.source.keys().map(String::as_str));
args.push("--");
args.extend(flakes);
context.run(&sh::prune(), &args)?;
}
Ok(())
}
/// Fails, before changing anything, if flakes would get copied to a remote
/// target using sudo, which nix copy doesn't support: it logs in as the
/// target's user.
fn refuse_copying_with_sudo(context: &Context, spec: &Spec) -> Result<()> {
for (name, source) in &spec.source {
let copying = matches!(source.kind.as_str(), "flake" | "flake-input")
&& source
.settings
.get("fetchOnTarget")
.and_then(Value::as_bool)
!= Some(true);
if copying && context.target.sudo && !context.local {
return Err(Failure::Message(format!(
"krops: source {}/{name}: copying flakes to targets with sudo is not supported",
spec.target.path
)));
}
}
Ok(())
}
fn string<'a>(settings: &'a Map<String, Value>, key: &str) -> Result<&'a str> {
settings
.get(key)
.and_then(Value::as_str)
.ok_or_else(|| Failure::Message(format!("populate: the source has no {key}")))
}
/// Delivers a source to path on the target, using workdir for files it
/// prepares on the deploying machine.
fn deliver(
context: &Context,
name: &str,
source: &Source,
path: &str,
workdir: PathBuf,
) -> Result<()> {
let settings = &source.settings;
match source.kind.as_str() {
"derivation" => context.run(
&sh::derivation(),
&[path, &context.name(path), string(settings, "text")?],
),
"file" => {
let source_path = string(settings, "path")?;
// Store paths have the same time, so only checksums tell
// different contents apart.
let use_checksum = settings
.get("useChecksum")
.and_then(Value::as_bool)
.unwrap_or(run::is_store_path(source_path));
let config = Config {
use_checksum,
..Config::from_settings(settings)
};
rsync::transfer(context, &config, source_path, path)
}
"pipe" => {
let out = workdir.join("out");
let file = fs::File::create(&out).map_err(|e| {
Failure::Message(format!("error: can't create {}: {e}", out.display()))
})?;
// Through a shell, which runs a command without #! as a script.
run::status(
run::local_shell("\"$1\"\n", &[string(settings, "command")?], &workdir)
.stdout(file),
)?;
run::status(
Command::new("touch")
.arg("-t")
.arg("300001010000")
.arg(&out),
)?;
// With the fixed modification time, only checksums tell outputs
// of the same size apart.
let config = Config {
use_checksum: true,
..Config::default()
};
rsync::transfer(context, &config, &out.to_string_lossy(), path)
}
"flake" | "flake-input" => flake_input::deliver(context, name, path, source, &workdir),
"git" => {
let flag = |key| match settings.get(key).and_then(Value::as_bool) {
Some(true) => "1",
_ => "",
};
let excludes = settings
.get("clean")
.and_then(|clean| clean.get("exclude"))
.and_then(Value::as_array)
.into_iter()
.flatten()
.filter_map(Value::as_str);
let name = context.name(path);
let mut args = vec![
path,
&name,
string(settings, "url")?,
string(settings, "ref")?,
flag("shallow"),
flag("fetchAlways"),
flag("reclone"),
];
args.extend(excludes);
context.run(&sh::git(), &args)
}
"pass" => {
let dir = string(settings, "dir")?;
let name = string(settings, "name")?;
let info = run::output(&mut run::local_shell(
sh::local::PASS_INFO,
&[dir, name],
&workdir,
))?;
let info = info.trim_end_matches('\n');
if !info.is_empty() {
let delivered = context.output(sh::PASS_INFO, &[path])?;
if delivered.trim_end_matches('\n') == info {
return Ok(());
}
}
run::status(&mut run::local_shell(
sh::local::PASS,
&[dir, name, info],
&workdir,
))?;
rsync::transfer(
context,
&Config::default(),
&workdir.to_string_lossy(),
path,
)
}
"passage" => {
let host = context.target.host.split('.').next().unwrap_or_default();
let mut command = run::local_shell(sh::local::PASSAGE, &[host], &workdir);
for (variable, key) in [
("PASSAGE_AGE", "age"),
("PASSAGE_DIR", "dir"),
("PASSAGE_IDENTITIES_FILE", "identities_file"),
] {
command.env(variable, string(settings, key)?);
}
run::status(&mut command)?;
rsync::transfer(
context,
&Config::default(),
&workdir.to_string_lossy(),
path,
)
}
"symlink" => context.run(sh::SYMLINK, &[path, string(settings, "target")?]),
// The spec's types are all of the above.
kind => Err(Failure::Message(format!(
"populate: unknown source type {kind}"
))),
}
}
|
