Provide an implementation for systemd-tmpfiles.

Co-authored-by: aanderse <aaron@fosslib.net>
Co-authored-by: jfroche <jfroche@pyxel.be>

src/activate/tmp_files.rs

@@ -0,0 +1,29 @@
+use crate::activate;
+
+use super::ActivationResult;
+use std::process;
+
+type TmpFilesActivationResult = ActivationResult<()>;
+
+pub fn activate() -> TmpFilesActivationResult {
+    let mut cmd = process::Command::new("systemd-tmpfiles");
+    cmd.arg("--create")
+        .arg("--remove")
+        .arg("/etc/tmpfiles.d/00-system-manager.conf");
+    let output = cmd
+        .stdout(process::Stdio::inherit())
+        .stderr(process::Stdio::inherit())
+        .output()
+        .expect("Error forking process");
+
+    output.status.success().then_some(()).ok_or_else(|| {
+        activate::ActivationError::WithPartialResult {
+            result: (),
+            source: anyhow::anyhow!(
+                "Error while creating tmpfiles\nstdout: {}\nstderr: {}",
+                String::from_utf8_lossy(output.stdout.as_ref()),
+                String::from_utf8_lossy(output.stderr.as_ref())
+            ),
+        }
+    })
+}