install: Add support for pulling LBIs during install

Partially solves containers#846

This adds a new `--pull` option to `bootc install` which will pull
all LBIs into the target's container storage, even if they are not
available in the source root container storage.

Signed-off-by: Omer Tuchfeld <[email protected]>

lib/src/boundimage.rs

@@ -108,6 +108,7 @@ pub(crate) fn query_bound_images(root: &Dir) -> Result<Vec<BoundImage>> {
 
 #[cfg(feature = "install")]
 impl ResolvedBoundImage {
+    #[context("resolving bound image {}", src.image)]
     pub(crate) async fn from_image(src: &BoundImage) -> Result<Self> {
         let proxy = containers_image_proxy::ImageProxy::new().await?;
         let img = proxy
@@ -148,7 +149,10 @@ fn parse_container_file(file_contents: &tini::Ini) -> Result<BoundImage> {
 }
 
 #[context("Pulling bound images")]
-pub(crate) async fn pull_images(sysroot: &Storage, bound_images: Vec<BoundImage>) -> Result<()> {
+pub(crate) async fn pull_images(
+    sysroot: &Storage,
+    bound_images: Vec<crate::boundimage::BoundImage>,
+) -> Result<()> {
     tracing::debug!("Pulling bound images: {}", bound_images.len());
     // Yes, the usage of NonZeroUsize here is...maybe odd looking, but I find
     // it an elegant way to divide (empty vector, non empty vector) since

lib/src/install.rs

@@ -44,6 +44,7 @@ use rustix::fs::{FileTypeExt, MetadataExt as _};
 use serde::{Deserialize, Serialize};
 
 use self::baseline::InstallBlockDeviceOpts;
+use crate::boundimage::{BoundImage, ResolvedBoundImage};
 use crate::containerenv::ContainerExecutionInfo;
 use crate::mount::Filesystem;
 use crate::spec::ImageReference;
@@ -165,11 +166,16 @@ pub(crate) struct InstallConfigOpts {
     #[serde(default)]
     pub(crate) generic_image: bool,
 
-    /// Do not pull any "logically bound" images at install time.
+    /// Do not resolve any "logically bound" images at install time.
     #[clap(long, hide = true)]
     #[serde(default)]
     pub(crate) skip_bound_images: bool,
 
+    /// Pull "logically bound" images at install time.
+    #[clap(long)]
+    #[serde(default)]
+    pub(crate) pull: bool,
+
     /// The stateroot name to use. Defaults to `default`.
     #[clap(long)]
     pub(crate) stateroot: Option<String>,
@@ -1271,7 +1277,7 @@ async fn install_with_sysroot(
     rootfs: &RootSetup,
     sysroot: &Storage,
     boot_uuid: &str,
-    bound_images: &[crate::boundimage::ResolvedBoundImage],
+    bound_images: BoundImages,
 ) -> Result<()> {
     // And actually set up the container in that root, returning a deployment and
     // the aleph state (see below).
@@ -1298,18 +1304,66 @@ async fn install_with_sysroot(
     tracing::debug!("Installed bootloader");
 
     tracing::debug!("Perfoming post-deployment operations");
-    // Note that we *always* initialize this container storage, even
-    // if there are no bound images today.
+
+    // Note that we *always* initialize this container storage, even if there are no bound images
+    // today.
     let imgstore = sysroot.get_ensure_imgstore()?;
-    // Now copy each bound image from the host's container storage into the target.
-    for image in bound_images {
-        let image = image.image.as_str();
-        imgstore.pull_from_host_storage(image).await?;
+
+    match bound_images {
+        BoundImages::Skip => {}
+        BoundImages::Resolved(resolved_bound_images) => {
+            // Now copy each bound image from the host's container storage into the target.
+            for image in resolved_bound_images {
+                let image = image.image.as_str();
+                imgstore.pull_from_host_storage(image).await?;
+            }
+        }
+        BoundImages::Unresolved(bound_images) => {
+            crate::boundimage::pull_images(sysroot, bound_images)
+                .await
+                .context("pulling bound images")?;
+        }
     }
 
     Ok(())
 }
 
+enum BoundImages {
+    Skip,
+    Resolved(Vec<ResolvedBoundImage>),
+    Unresolved(Vec<BoundImage>),
+}
+
+impl BoundImages {
+    async fn from_state(state: &State) -> Result<Self> {
+        let bound_images = (!state.config_opts.skip_bound_images)
+            .then(|| crate::boundimage::query_bound_images(&state.container_root))
+            .transpose()?;
+
+        let bound_images = match bound_images {
+            Some(bound_images) => {
+                tracing::debug!("bound images={bound_images:?}");
+                if state.config_opts.pull {
+                    // No need to resolve the images, we will pull them into the target later
+                    BoundImages::Unresolved(bound_images)
+                } else {
+                    // Verify each bound image is present in the container storage
+                    let mut r = Vec::with_capacity(bound_images.len());
+                    for image in bound_images {
+                        let resolved = ResolvedBoundImage::from_image(&image).await?;
+                        tracing::debug!("Resolved {}: {}", resolved.image, resolved.digest);
+                        r.push(resolved)
+                    }
+                    BoundImages::Resolved(r)
+                }
+            }
+            None => BoundImages::Skip,
+        };
+
+        Ok(bound_images)
+    }
+}
+
 async fn install_to_filesystem_impl(state: &State, rootfs: &mut RootSetup) -> Result<()> {
     if matches!(state.selinux_state, SELinuxFinalState::ForceTargetDisabled) {
         rootfs.kargs.push("selinux=0".to_string());
@@ -1336,28 +1390,12 @@ async fn install_to_filesystem_impl(state: &State, rootfs: &mut RootSetup) -> Re
         .ok_or_else(|| anyhow!("No uuid for boot/root"))?;
     tracing::debug!("boot uuid={boot_uuid}");
 
-    let bound_images = if state.config_opts.skip_bound_images {
-        Vec::new()
-    } else {
-        crate::boundimage::query_bound_images(&state.container_root)?
-    };
-    tracing::debug!("bound images={bound_images:?}");
-
-    // Verify each bound image is present in the container storage
-    let bound_images = {
-        let mut r = Vec::with_capacity(bound_images.len());
-        for image in bound_images {
-            let resolved = crate::boundimage::ResolvedBoundImage::from_image(&image).await?;
-            tracing::debug!("Resolved {}: {}", resolved.image, resolved.digest);
-            r.push(resolved)
-        }
-        r
-    };
+    let bound_images = BoundImages::from_state(state).await?;
 
     // Initialize the ostree sysroot (repo, stateroot, etc.)
     {
         let sysroot = initialize_ostree_root(state, rootfs).await?;
-        install_with_sysroot(state, rootfs, &sysroot, &boot_uuid, &bound_images).await?;
+        install_with_sysroot(state, rootfs, &sysroot, &boot_uuid, bound_images).await?;
         // We must drop the sysroot here in order to close any open file
         // descriptors.
     }