install: add root_path for RootSetup

When `install to-filesystem` on ostree OS, will pass `root_path`
to bootupctl to install bootloader.

Signed-off-by: Huijing Hei <hhei@redhat.com>

Author: HuijingHei

crates/lib/src/install.rs

@@ -1080,6 +1080,7 @@ pub(crate) struct RootSetup {
     pub(crate) physical_root_path: Utf8PathBuf,
     /// Directory file descriptor for the above physical root.
     pub(crate) physical_root: Dir,
+    pub(crate) target_root_path: Option<Utf8PathBuf>,
     pub(crate) rootfs_uuid: Option<String>,
     /// True if we should skip finalizing
     skip_finalize: bool,
@@ -1521,7 +1522,10 @@ async fn install_with_sysroot(
             Bootloader::Grub => {
                 crate::bootloader::install_via_bootupd(
                     &rootfs.device_info,
-                    &rootfs.physical_root_path,
+                    &rootfs
+                        .target_root_path
+                        .clone()
+                        .unwrap_or(rootfs.physical_root_path.clone()),
                     &state.config_opts,
                     Some(&deployment_path.as_str()),
                 )?;
@@ -1993,6 +1997,7 @@ pub(crate) async fn install_to_filesystem(
         .context("Mounting host / to {ALONGSIDE_ROOT_MOUNT}")?;
     }
 
+    let target_root_path = &fsopts.root_path.clone();
     // Check that the target is a directory
     {
         let root_path = &fsopts.root_path;
@@ -2012,6 +2017,20 @@ pub(crate) async fn install_to_filesystem(
         warn_on_host_root(&rootfs_fd)?;
     }
 
+    // Get a file descriptor for the root path /target
+    // This is needed to find boot dev
+    let target_rootfs_fd = {
+        let rootfs_fd = Dir::open_ambient_dir(&target_root_path, cap_std::ambient_authority())
+            .with_context(|| format!("Opening target root directory {target_root_path}"))?;
+
+        tracing::debug!("Root filesystem: {target_root_path}");
+
+        if let Some(false) = rootfs_fd.is_mountpoint(".")? {
+            anyhow::bail!("Not a mountpoint: {target_root_path}");
+        }
+        rootfs_fd
+    };
+
     // If we're installing to an ostree root, then find the physical root from
     // the deployment root.
     let possible_physical_root = fsopts.root_path.join("sysroot");
@@ -2025,9 +2044,9 @@ pub(crate) async fn install_to_filesystem(
     };
 
     // Get a file descriptor for the root path
-    let rootfs_fd = {
+    let rootfs_fd = if fsopts.root_path.ends_with("sysroot") {
         let root_path = &fsopts.root_path;
-        let rootfs_fd = Dir::open_ambient_dir(&fsopts.root_path, cap_std::ambient_authority())
+        let rootfs_fd = Dir::open_ambient_dir(root_path, cap_std::ambient_authority())
             .with_context(|| format!("Opening target root directory {root_path}"))?;
 
         tracing::debug!("Root filesystem: {root_path}");
@@ -2036,6 +2055,8 @@ pub(crate) async fn install_to_filesystem(
             anyhow::bail!("Not a mountpoint: {root_path}");
         }
         rootfs_fd
+    } else {
+        target_rootfs_fd.try_clone()?
     };
 
     match fsopts.replace {
@@ -2045,8 +2066,11 @@ pub(crate) async fn install_to_filesystem(
             tokio::task::spawn_blocking(move || remove_all_in_dir_no_xdev(&rootfs_fd, true))
                 .await??;
         }
-        Some(ReplaceMode::Alongside) => clean_boot_directories(&rootfs_fd, is_already_ostree)?,
-        None => require_empty_rootdir(&rootfs_fd)?,
+        // Find boot under /
+        Some(ReplaceMode::Alongside) => {
+            clean_boot_directories(&target_rootfs_fd, is_already_ostree)?
+        }
+        None => require_empty_rootdir(&target_rootfs_fd)?,
     }
 
     // Gather data about the root filesystem
@@ -2090,7 +2114,7 @@ pub(crate) async fn install_to_filesystem(
 
     let boot_is_mount = {
         let root_dev = rootfs_fd.dir_metadata()?.dev();
-        let boot_dev = rootfs_fd
+        let boot_dev = target_rootfs_fd
             .symlink_metadata_optional(BOOT)?
             .ok_or_else(|| {
                 anyhow!("No /{BOOT} directory found in root; this is is currently required")
@@ -2101,9 +2125,10 @@ pub(crate) async fn install_to_filesystem(
     };
     // Find the UUID of /boot because we need it for GRUB.
     let boot_uuid = if boot_is_mount {
-        let boot_path = fsopts.root_path.join(BOOT);
+        let boot_path = target_root_path.join(BOOT);
+        tracing::debug!("boot_path={boot_path}");
         let u = bootc_mount::inspect_filesystem(&boot_path)
-            .context("Inspecting /{BOOT}")?
+            .with_context(|| format!("Inspecting /{BOOT}"))?
             .uuid
             .ok_or_else(|| anyhow!("No UUID found for /{BOOT}"))?;
         Some(u)
@@ -2184,6 +2209,7 @@ pub(crate) async fn install_to_filesystem(
         device_info,
         physical_root_path: fsopts.root_path,
         physical_root: rootfs_fd,
+        target_root_path: Some(target_root_path.clone()),
         rootfs_uuid: inspect.uuid.clone(),
         boot,
         kargs,

crates/lib/src/install/baseline.rs

@@ -485,6 +485,7 @@ pub(crate) fn install_create_rootfs(
         device_info,
         physical_root_path,
         physical_root,
+        target_root_path: None,
         rootfs_uuid: Some(root_uuid.to_string()),
         boot,
         kargs,