4 files changed, 71 insertions(+), 0 deletions(-)

A .gitignore
A Cargo.lock
A Cargo.toml
A src/main.rs

@@ 0,0 1,1 @@
+/target

@@ 0,0 1,16 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "anyhow"
+version = "1.0.44"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "61604a8f862e1d5c3229fdd78f8b02c68dcf73a4c4b05fd636d12240aaa242c1"
+
+[[package]]
+name = "envgen-collector"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+]

@@ 0,0 1,9 @@
+[package]
+name = "envgen-collector"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "1"

@@ 0,0 1,45 @@
+use std::{
+    collections::BTreeMap,
+    path::{Path, PathBuf},
+};
+
+use anyhow::Result;
+
+static PREFIXES: [&str; 4] = ["/run", "/etc", "/usr/local/lib", "/usr/lib"];
+static SUEG: &str = "systemd/user-environment-generators";
+
+fn try_main() -> Result<()> {
+    let dev_null = PathBuf::from("/dev/null");
+    let mut generators = BTreeMap::new();
+    let dirs = PREFIXES.map(|p| Path::new(p).join(SUEG));
+    for dir in dirs {
+        let entries = match dir.read_dir() {
+            Err(e) if e.kind() == std::io::ErrorKind::NotFound => continue,
+            Err(e) => return Err(e.into()),
+            Ok(entries) => entries,
+        };
+
+        for entry in entries {
+            let entry = entry?;
+            let file_name = entry.file_name();
+            let canonicalized = entry.path().canonicalize()?;
+            let entry = if canonicalized == dev_null {
+                None
+            } else {
+                Some(canonicalized)
+            };
+            generators.entry(file_name).or_insert(entry);
+        }
+    }
+    for v in generators.values().filter(|v| v.is_some()) {
+        // SAFETY: We filter out `None`s so this is fine
+        println!("{}", v.as_ref().unwrap().display());
+    }
+    Ok(())
+}
+
+fn main() {
+    if let Err(e) = try_main() {
+        eprintln!("{:?}", e)
+    }
+}