WIP: Retrieve bound images when staging new image

Signed-off-by: Chris Kyrouac <ckyrouac@redhat.com>

lib/src/boundimage.rs

@@ -0,0 +1,116 @@
+use anyhow::Result;
+
+use ostree_ext::ostree::Deployment;
+use ostree_ext::sysroot::SysrootLock;
+
+use std::fs;
+use std::path::Path;
+
+use crate::task::Task;
+
+use tempfile::TempDir;
+
+const BOOTC_QUADLET_DIR: &'static str = "/etc/containers/systemd/bootc";
+const QUADLET_BINARY: &'static str = "/usr/lib/systemd/system-generators/podman-system-generator";
+const SYSTEMD_DIR: &'static str = "/etc/systemd/system";
+
+pub(crate) struct BoundImageManager {
+    quadlet_unit_dir: String,
+    units: Vec<String>,
+    temp_dir: TempDir,
+}
+
+impl BoundImageManager {
+    pub(crate) fn new(deployment: &Deployment, sysroot: &SysrootLock) -> Result<BoundImageManager> {
+        let deployment_dir = sysroot.deployment_dirpath(&deployment);
+        let quadlet_unit_dir = format!("/{deployment_dir}/{BOOTC_QUADLET_DIR}");
+
+        let temp_dir = TempDir::new()?;
+        let bound_image_manager = BoundImageManager {
+            quadlet_unit_dir,
+            units: Vec::new(),
+            temp_dir,
+        };
+        Ok(bound_image_manager)
+    }
+
+    pub(crate) fn run(&mut self) -> Result<()> {
+        if Path::new(&self.quadlet_unit_dir).exists() {
+            self.run_quadlet()?;
+            self.move_units()?;
+            self.restart_systemd()?;
+            self.start_new_services()?;
+        }
+
+        Ok(())
+    }
+
+    // Run podman-system-generator to generate the systemd units
+    // the output is written to a temporary directory
+    // in order to track the generated units.
+    // The generated units need to be moved to /etc/systemd/system
+    // to be started by systemd.
+    fn run_quadlet(&self) -> Result<()> {
+        Task::new(
+            format!("Running quadlet on {:#}", self.quadlet_unit_dir),
+            QUADLET_BINARY,
+        )
+        .arg(self.temp_dir.path())
+        .env(&"QUADLET_UNIT_DIRS".to_string(), &self.quadlet_unit_dir)
+        .run()?;
+
+        Ok(())
+    }
+
+    fn move_units(&mut self) -> Result<()> {
+        let entries = fs::read_dir(self.temp_dir.path())?;
+        for bound_image in entries {
+            let bound_image = bound_image?;
+            let bound_image_path = bound_image.path();
+            let unit_name = bound_image_path.file_name().unwrap().to_str().unwrap();
+
+            //move the unit file from the bootc subdirectory to the root systemd directory
+            let systemd_dst = format!("{SYSTEMD_DIR}/{unit_name}");
+            if !Path::new(systemd_dst.as_str()).exists() {
+                fs::copy(&bound_image_path, systemd_dst)?;
+            }
+
+            self.units.push(unit_name.to_string());
+        }
+
+        Ok(())
+    }
+
+    fn restart_systemd(&self) -> Result<()> {
+        Task::new_and_run("Reloading systemd", "/usr/bin/systemctl", ["daemon-reload"])?;
+        Ok(())
+    }
+
+    fn start_new_services(&self) -> Result<()> {
+        //TODO: do this in parallel
+        for unit in &self.units {
+            Task::new_and_run(
+                format!("Starting target: {:#}", unit),
+                "/usr/bin/systemctl",
+                ["start", unit],
+            )?;
+        }
+        Ok(())
+    }
+}
+
+impl Drop for BoundImageManager {
+    //remove the generated units from the root systemd directory
+    //and stop them to remove the services from systemd
+    fn drop(&mut self) {
+        for unit in &self.units {
+            //TODO: error handling
+            let _ = fs::remove_file(format!("{SYSTEMD_DIR}/{unit}"));
+            let _ = Task::new_and_run(
+                format!("Starting target: {:#}", unit),
+                "/usr/bin/systemctl",
+                ["stop", unit],
+            );
+        }
+    }
+}

lib/src/deploy.rs

@@ -278,20 +278,21 @@ async fn deploy(
     image: &ImageState,
     origin: &glib::KeyFile,
     opts: Option<ostree::SysrootDeployTreeOpts<'_>>,
-) -> Result<()> {
+) -> Result<Deployment> {
     let stateroot = Some(stateroot);
     let opts = opts.unwrap_or_default();
     // Copy to move into thread
     let cancellable = gio::Cancellable::NONE;
-    let _new_deployment = sysroot.stage_tree_with_options(
-        stateroot,
-        image.ostree_commit.as_str(),
-        Some(origin),
-        merge_deployment,
-        &opts,
-        cancellable,
-    )?;
-    Ok(())
+    return sysroot
+        .stage_tree_with_options(
+            stateroot,
+            image.ostree_commit.as_str(),
+            Some(origin),
+            merge_deployment,
+            &opts,
+            cancellable,
+        )
+        .map_err(Into::into);
 }
 
 #[context("Generating origin")]
@@ -317,7 +318,7 @@ pub(crate) async fn stage(
 ) -> Result<()> {
     let merge_deployment = sysroot.merge_deployment(Some(stateroot));
     let origin = origin_from_imageref(spec.image)?;
-    crate::deploy::deploy(
+    let deployment = crate::deploy::deploy(
         sysroot,
         merge_deployment.as_ref(),
         stateroot,
@@ -326,6 +327,11 @@ pub(crate) async fn stage(
         opts,
     )
     .await?;
+
+    //TODO: does this need to be mutable?
+    let mut bound_image_manager = crate::boundimage::BoundImageManager::new(&deployment, sysroot)?;
+    bound_image_manager.run()?;
+
     crate::deploy::cleanup(sysroot).await?;
     println!("Queued for next boot: {:#}", spec.image);
     if let Some(version) = image.version.as_deref() {

lib/src/install.rs

@@ -1204,6 +1204,22 @@ async fn install_to_filesystem_impl(state: &State, rootfs: &mut RootSetup) -> Re
                 anyhow::Ok(())
             })
             .context("Writing aleph version")?;
+
+        // TODO: add code to run quadlet/systemd against the bootc-bound-image directory
+        // let bound = query_bound_state(&inst.deployment)?;
+        // bound.print();
+        // if !bound.is_empty() {
+        //     println!();
+        //     Task::new("Mounting deployment /var", "mount")
+        //         .args(["--bind", ".", "/var"])
+        //         .cwd(&inst.var)?
+        //         .run()?;
+        //     // podman needs this
+        //     Task::new("Initializing /var/tmp", "systemd-tmpfiles")
+        //         .args(["--create", "--boot", "--prefix=/var/tmp"])
+        //         .verbose()
+        //         .run()?;
+        //     crate::deploy::fetch_bound_state(&bound).await?;
     }
 
     crate::bootloader::install_via_bootupd(&rootfs.device, &rootfs.rootfs, &state.config_opts)?;

lib/src/lib.rs

@@ -18,6 +18,7 @@
 #![allow(clippy::needless_borrows_for_generic_args)]
 
 pub mod cli;
+mod boundimage;
 pub(crate) mod deploy;
 pub(crate) mod generator;
 pub(crate) mod journal;

lib/src/task.rs

@@ -1,7 +1,5 @@
 use std::{
-    ffi::OsStr,
-    io::{Seek, Write},
-    process::{Command, Stdio},
+    ffi::OsStr, io::{Seek, Write}, process::{Command, Stdio}
 };
 
 use anyhow::{Context, Result};
@@ -76,6 +74,11 @@ impl Task {
         self
     }
 
+    pub(crate) fn env(mut self, k: &str, v: &str) -> Self {
+        self.cmd.env(k, v);
+        self
+    }
+
     pub(crate) fn args<S: AsRef<OsStr>>(mut self, args: impl IntoIterator<Item = S>) -> Self {
         self.cmd.args(args);
         self