figsoda · Apr 10, 2026 · Apr 9, 2026 · Apr 10, 2026 · Apr 10, 2026
diff --git a/src/inputs.rs b/src/inputs.rs
@@ -24,6 +24,8 @@ pub struct Inputs {
     pub x86_64_linux: BTreeSet<String>,
 }
 
+// "all" here refers to all systems
+// does not write out python inputs or nix-update-script
 pub fn write_all_lambda_inputs(
     out: &mut impl Write,
     inputs: &AllInputs,

diff --git a/src/main.rs b/src/main.rs
@@ -556,6 +556,7 @@ async fn run() -> Result<()> {
         }
     }
 
+    let nix_update_script = matches!(fetcher, MaybeFetcher::Known(_));
     match fetcher {
         MaybeFetcher::Known(fetcher) => {
             writeln!(out, "  {fetcher},")?;
@@ -588,6 +589,10 @@ async fn run() -> Result<()> {
             };
 
             let res = write_all_lambda_inputs(&mut out, &inputs, &mut BTreeSet::new())?;
+            if nix_update_script {
+                writeln!(out, "  nix-update-script,")?;
+            }
+
             writedoc! {out, r#"
                 }}:
 
@@ -674,6 +679,9 @@ async fn run() -> Result<()> {
                     write_lambda_input(&mut out, &mut written, &name.to_kebab_case())?;
                 }
             }
+            if nix_update_script {
+                writeln!(out, "  nix-update-script,")?;
+            }
 
             writedoc! {out, r#"
                 }}:
@@ -727,8 +735,13 @@ async fn run() -> Result<()> {
                 &nixpkgs,
             )
             .await;
+
             let res =
                 write_all_lambda_inputs(&mut out, &inputs, &mut ["rustPlatform".into()].into())?;
+            if nix_update_script {
+ 
8000
               writeln!(out, "  nix-update-script,")?;
+            }
+
             writedoc! {out, r#"
                 }}:
 
@@ -762,6 +775,10 @@ async fn run() -> Result<()> {
 
             let res =
                 write_all_lambda_inputs(&mut out, &inputs, &mut ["rustPlatform".into()].into())?;
+            if nix_update_script {
+                writeln!(out, "  nix-update-script,")?;
+            }
+
             writedoc! {out, r#"
                 }}:
 
@@ -779,6 +796,10 @@ async fn run() -> Result<()> {
 
         Builder::MkDerivation { rust: None } => {
             let res = write_all_lambda_inputs(&mut out, &inputs, &mut ["stdenv".into()].into())?;
+            if nix_update_script {
+                writeln!(out, "  nix-update-script,")?;
+            }
+
             writedoc! { out, r#"
                 }}:
 
@@ -805,7 +826,12 @@ async fn run() -> Result<()> {
                 &nixpkgs,
             )
             .await;
+
             let res = write_all_lambda_inputs(&mut out, &inputs, &mut ["stdenv".into()].into())?;
+            if nix_update_script {
+                writeln!(out, "  nix-update-script,")?;
+            }
+
             writedoc! {out, r#"
                 }}:
 
@@ -841,6 +867,10 @@ async fn run() -> Result<()> {
             };
 
             let res = write_all_lambda_inputs(&mut out, &inputs, &mut ["stdenv".into()].into())?;
+            if nix_update_script {
+                writeln!(out, "  nix-update-script,")?;
+            }
+
             writedoc! {out, r#"
                 }}:
 
@@ -859,6 +889,10 @@ async fn run() -> Result<()> {
         Builder::MkDerivationNoCC => {
             let res =
                 write_all_lambda_inputs(&mut out, &inputs, &mut ["stdenvNoCC".into()].into())?;
+            if nix_update_script {
+                writeln!(out, "  nix-update-script,")?;
+            }
+
             writedoc! { out, r#"
                 }}:
 
@@ -951,6 +985,10 @@ async fn run() -> Result<()> {
         writeln!(out, "  }};\n")?;
     }
 
+    if nix_update_script {
+        writeln!(out, "  passthru.updateScript = nix-update-script {{ }};\n")?;
+    }
+
     let mut desc = desc.trim_matches(|c: char| !c.is_alphanumeric()).to_owned();
     desc.get_mut(0 .. 1).map(str::make_ascii_uppercase);
     write!(out, "  ")?;

diff --git a/tests/cmd/drv-no-cc.out/default.nix b/tests/cmd/drv-no-cc.out/default.nix
@@ -2,6 +2,7 @@
   lib,
   stdenvNoCC,
   fetchFromGitHub,
+  nix-update-script,
 }:
 
 stdenvNoCC.mkDerivation (finalAttrs: {
@@ -15,6 +16,8 @@ stdenvNoCC.mkDerivation (finalAttrs: {
     hash = "sha256-nuw/riQaAdk0fYUpm3z978YGPDJnzc66DnOj774tPu0=";
   };
 
+  passthru.updateScript = nix-update-script { };
+
   meta = {
     description = "[..]";
     homepage = "https://github.com/z-shell/zi";

diff --git a/tests/cmd/drv-rust.out/default.nix b/tests/cmd/drv-rust.out/default.nix
@@ -20,6 +20,7 @@
   libpulseaudio,
   pango,
   udev,
+  nix-update-script,
 }:
 
 stdenv.mkDerivation (finalAttrs: {
@@ -62,6 +63,8 @@ stdenv.mkDerivation (finalAttrs: {
     udev
   ];
 
+  passthru.updateScript = nix-update-script { };
+
   meta = {
     description = "[..]";
     homepage = "https://github.com/ErikReider/SwayOSD";

diff --git a/tests/cmd/drv-sourcehut.out/default.nix b/tests/cmd/drv-sourcehut.out/default.nix
@@ -0,0 +1,26 @@
+{
+  lib,
+  stdenv,
+  fetchFromSourcehut,
+}:
+
+stdenv.mkDerivation (finalAttrs: {
+  pname = "scdoc";
+  version = "1.11.3";
+
+  src = fetchFromSourcehut {
+    owner = "~sircmpwn";
+    repo = "scdoc";
+    tag = finalAttrs.version;
+    hash = "sha256-MbLDhLn/JY6OcdOz9/mIPAQRp5TZ6IKuQ/FQ/R3wjGc=";
+  };
+
+  meta = {
+    description = "[..]";
+    homepage = "https://git.sr.ht/~sircmpwn/scdoc";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ alice ];
+    mainProgram = "scdoc";
+    platforms = lib.platforms.all;
+  };
+})
diff --git a/tests/cmd/drv-sourcehut.toml b/tests/cmd/drv-sourcehut.toml
@@ -0,0 +1 @@
+args = ["--headless", "--url=https://git.sr.ht/~sircmpwn/scdoc", "--rev=1.11.3"]
diff --git a/tests/cmd/drv.out/default.nix b/tests/cmd/drv.out/default.nix
@@ -4,6 +4,7 @@
   fetchFromGitHub,
   meson,
   ninja,
+  nix-update-script,
 }:
 
 stdenv.mkDerivation (finalAttrs: {
@@ -22,6 +23,8 @@ stdenv.mkDerivation (finalAttrs: {
     ninja
   ];
 
+  passthru.updateScript = nix-update-script { };
+
   meta = {
     description = "[..]";
     homepage = "https://github.com/containers/bubblewrap";

diff --git a/tests/cmd/go.out/default.nix b/tests/cmd/go.out/default.nix
@@ -2,6 +2,7 @@
   lib,
   buildGoModule,
   fetchFromGitHub,
+  nix-update-script,
 }:
 
 buildGoModule (finalAttrs: {
@@ -24,6 +25,8 @@ buildGoModule (finalAttrs: {
     "-X=main.revision=${finalAttrs.src.rev}"
   ];
 
+  passthru.updateScript = nix-update-script { };
+
   meta = {
     description = "[..]";
     homepage = "https://github.com/junegunn/fzf";

@@ -2,6 +2,7 @@
   lib,
   python3,
   fetchFromGitHub,
+  nix-update-script,
 }:
 
 python3.pkgs.buildPythonApplication (finalAttrs: {
@@ -53,6 +54,8 @@ python3.pkgs.buildPythonApplication (finalAttrs: {
     "black"
   ];
 
+  passthru.updateScript = nix-update-script { };
+
   meta = {
     description = "[..]";
     homepage = "https://github.com/psf/black";

@@ -5,6 +5,7 @@
   flit-core,
   markupsafe,
   babel,
+  nix-update-script,
 }:
 
 buildPythonPackage (finalAttrs: {
@@ -37,6 +38,8 @@ buildPythonPackage (finalAttrs: {
     "jinja2"
   ];
 
+  passthru.updateScript = nix-update-script { };
+
   meta = {
     description = "[..]";
     homepage = "https://github.com/pallets/jinja";

@@ -31,6 +31,7 @@
   pytest-cov,
   pytest-xdist,
   pytest-randomly,
+  nix-update-script,
 }:
 
 buildPythonPackage (finalAttrs: {
@@ -113,6 +114,8 @@ buildPythonPackage (finalAttrs: {
     "cryptography"
   ];
 
+  passthru.updateScript = nix-update-script { };
+
   meta = {
     description = "[..]";
     homepage = "https://github.com/pyca/cryptography";

@@ -9,6 +9,7 @@
   sqlite,
   zlib,
   zstd,
+  nix-update-script,
 }:
 
 rustPlatform.buildRustPackage (finalAttrs: {
@@ -45,6 +46,8 @@ rustPlatform.buildRustPackage (finalAttrs: {
     ZSTD_SYS_USE_PKG_CONFIG = true;
   };
 
+  passthru.updateScript = nix-update-script { };
+
   meta = {
     description = "[..]";
     homepage = "https://github.com/nix-community/nix-init";
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		args = ["--headless", "--url=https://git.sr.ht/~sircmpwn/scdoc", "--rev=1.11.3"]