Add libvirt-related environment handling, directory preparation, and bump version to 0.1.7

- Add default `LIBVIRT_URI`, `HOME`, and `XDG_CACHE_HOME` environment variable handling for `virsh` commands.
- Ensure writable cache directories for the service user in packaging scripts.
- Update systemd service to include libvirt-related environment defaults.
- Bump orchestrator version to 0.1.7.

Signed-off-by: Till Wegmueller <toasterson@gmail.com>

crates/orchestrator/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "orchestrator"
-version = "0.1.6"
+version = "0.1.7"
 edition = "2024"
 build = "build.rs"
 

crates/orchestrator/packaging/debian/postinst

@@ -11,6 +11,12 @@ mkdir -p /etc/solstice
 chown root:root /etc/solstice
 chmod 755 /etc/solstice
 
+# Create writable state/cache directories for the service user (for virsh/libvirt client caches)
+mkdir -p /var/lib/solstice-ci/.cache/libvirt
+chown -R solstice:solstice /var/lib/solstice-ci
+chmod 755 /var/lib/solstice-ci
+chmod -R 755 /var/lib/solstice-ci/.cache
+
 # Reload systemd units and enable service
 if command -v systemctl >/dev/null 2>&1; then
     systemctl daemon-reload || true

crates/orchestrator/packaging/solstice-orchestrator.service

@@ -7,6 +7,10 @@ Wants=network-online.target
 Type=simple
 EnvironmentFile=-/etc/default/solstice-orchestrator
 EnvironmentFile=-/etc/solstice/orchestrator.env
+# Provide sane defaults for libvirt client tools when running as system user
+Environment=HOME=/var/lib/solstice-ci
+Environment=XDG_CACHE_HOME=/var/lib/solstice-ci/.cache
+Environment=LIBVIRT_DEFAULT_URI=qemu:///system
 ExecStart=/usr/bin/solstice-orchestrator
 Restart=on-failure
 RestartSec=3s

crates/orchestrator/src/scheduler.rs

@@ -382,10 +382,31 @@ async fn discover_guest_ip_virsh(domain: &str, timeout: Duration) -> Option<Stri
     }
 
     async fn run_cmd(args: &[&str]) -> Attempt {
-        let args_vec = args.iter().map(|s| s.to_string()).collect::<Vec<_>>();
+        // Determine libvirt URI and cache/home dirs (best effort)
+        let uri = std::env::var("LIBVIRT_URI")
+            .ok()
+            .or_else(|| std::env::var("LIBVIRT_DEFAULT_URI").ok())
+            .unwrap_or_else(|| "qemu:///system".to_string());
+        let cache_base = std::env::var("XDG_CACHE_HOME").unwrap_or_else(|_| "/var/lib/solstice-ci/.cache".to_string());
+        let home_dir = std::env::var("HOME").unwrap_or_else(|_| "/var/lib/solstice-ci".to_string());
+
+        let args_vec = {
+            let mut v = Vec::with_capacity(args.len() + 2);
+            v.push("-c".to_string());
+            v.push(uri.clone());
+            v.extend(args.iter().map(|s| s.to_string()));
+            v
+        };
         let cmd_desc = format!("virsh {}", args_vec.join(" "));
         match task::spawn_blocking(move || {
-            Command::new("virsh").args(&args_vec).output()
+            // Ensure cache dir exists to avoid virsh trying to write under /nonexistent
+            let _ = std::fs::create_dir_all(format!("{}/libvirt", cache_base));
+            let mut cmd = Command::new("virsh");
+            cmd.args(&args_vec)
+                .env("LIBVIRT_DEFAULT_URI", &uri)
+                .env("XDG_CACHE_HOME", &cache_base)
+                .env("HOME", &home_dir);
+            cmd.output()
         }).await {
             Ok(Ok(out)) => {
                 let ok = out.status.success();