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Cannot deploy with Nix 2.32(pre) #340

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#346
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Cannot deploy with Nix 2.32(pre)#340
#346
@Rutherther

Description

@Rutherther
Rutherther
opened on Sep 18, 2025

I have installed nix from main branch of nix, nix 2.32-pre, and I couldn't deploy because of a strange error (no such file pointing to cwd/-activatable-nixos-system-...-.drv), I narrowed it down to the fact that nix show-derivation no longer shows full path with newer nix (I am not sure when the change was introduced, reverted back to 2.28 and it's fine)

Instead of something like

> nix show-derivation /nix/store/m1sczr2hq5z1xkg2hzhlpjq0c42isdii-activatable-nixos-system-cerebrum-25.11.20250916.8d4ddb1
{
  "/nix/store/22s18pb08i691lnal0pfm7yyf40pqsdv-activatable-nixos-system-cerebrum-25.11.20250916.8d4ddb1.drv": {

I am getting

> nix derivation show /nix/store/m1sczr2hq5z1xkg2hzhlpjq0c42isdii-activatable-nixos-system-cerebrum-25.11.20250916.8d4ddb1
{
  "22s18pb08i691lnal0pfm7yyf40pqsdv-activatable-nixos-system-cerebrum-25.11.20250916.8d4ddb1.drv": {

This path is obtained in deploy-rs code and then put to nix path-info. 1. it's interpreted as local path, searching under cwd, 2. even if in nix store, there is an error that the path is not a flake.

Here is the problematic code

deploy-rs/src/push.rs

Lines 223 to 261 in 125ae9e

show_derivation_command
.arg("show-derivation")
.arg(&data.deploy_data.profile.profile_settings.path);
let show_derivation_output = show_derivation_command
.output()
.await
.map_err(PushProfileError::ShowDerivation)?;
match show_derivation_output.status.code() {
Some(0) => (),
a => return Err(PushProfileError::ShowDerivationExit(a)),
};
let derivation_info: HashMap<&str, serde_json::value::Value> = serde_json::from_str(
std::str::from_utf8(&show_derivation_output.stdout)
.map_err(PushProfileError::ShowDerivationUtf8)?,
)
.map_err(PushProfileError::ShowDerivationParse)?;
let &deriver = derivation_info
.keys()
.next()
.ok_or(PushProfileError::ShowDerivationEmpty)?;
let new_deriver = &if data.supports_flakes || data.deploy_data.merged_settings.remote_build.unwrap_or(false) {
// Since nix 2.15.0 'nix build <path>.drv' will build only the .drv file itself, not the
// derivation outputs, '^out' is used to refer to outputs explicitly
deriver.to_owned().to_string() + "^out"
} else {
deriver.to_owned()
};
let path_info_output = Command::new("nix")
.arg("--experimental-features").arg("nix-command")
.arg("path-info")
.arg(&deriver)
.output().await
.map_err(PushProfileError::PathInfo)?;

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