Skip UEFI or BIOS on none hybrid partition layout

- When booting with `BIOS` and no `ESP` device detected, skip `UEFI`
checking
- When booting with `UEFI` and no `bios_boot` partition found, skip
`BIOS` checking

Fixes coreos/bootupd#717

Author: HuijingHei

src/bios.rs

@@ -8,10 +8,23 @@ use crate::packagesystem;
 use anyhow::{bail, Result};
 
 use crate::util;
+use serde::{Deserialize, Serialize};
 
 // grub2-install file path
 pub(crate) const GRUB_BIN: &str = "usr/sbin/grub2-install";
 
+#[derive(Serialize, Deserialize, Debug)]
+struct BlockDevice {
+    path: String,
+    pttype: String,
+    parttypename: Option<String>,
+}
+
+#[derive(Serialize, Deserialize, Debug)]
+struct Devices {
+    blockdevices: Vec<BlockDevice>,
+}
+
 #[derive(Default)]
 pub(crate) struct Bios {}
 
@@ -22,12 +35,11 @@ impl Bios {
         #[cfg(target_arch = "x86_64")]
         {
             // find /boot partition
-            let boot_dir = Path::new("/").join("boot");
             cmd = Command::new("findmnt");
             cmd.arg("--noheadings")
                 .arg("--output")
                 .arg("SOURCE")
-                .arg(boot_dir);
+                .arg("/boot");
             let partition = util::cmd_output(&mut cmd)?;
 
             // lsblk to find parent device
@@ -81,6 +93,38 @@ impl Bios {
         }
         Ok(())
     }
+
+    // check bios_boot partition on gpt type disk
+    fn get_bios_boot_partition(&self) -> Result<Option<String>> {
+        let target = self.get_device()?;
+        // lsblk to list children with bios_boot
+        let output = Command::new("lsblk")
+            .args([
+                "--json",
+                "--output",
+                "PATH,PTTYPE,PARTTYPENAME",
+                target.trim(),
+            ])
+            .output()?;
+        if !output.status.success() {
+            std::io::stderr().write_all(&output.stderr)?;
+            bail!("Failed to run lsblk");
+        }
+
+        let output = String::from_utf8(output.stdout)?;
+        // Parse the JSON string into the `Devices` struct
+        let devices: Devices = serde_json::from_str(&output).expect("JSON was not well-formatted");
+
+        // Find the device with the parttypename "BIOS boot"
+        for device in devices.blockdevices {
+            if let Some(parttypename) = &device.parttypename {
+                if parttypename == "BIOS boot" && device.pttype == "gpt" {
+                    return Ok(Some(device.path));
+                }
+            }
+        }
+        Ok(None)
+    }
 }
 
 impl Component for Bios {
@@ -120,6 +164,11 @@ impl Component for Bios {
     }
 
     fn query_adopt(&self) -> Result<Option<Adoptable>> {
+        #[cfg(target_arch = "x86_64")]
+        if crate::efi::is_efi_booted()? && self.get_bios_boot_partition()?.is_none() {
+            log::debug!("Skip BIOS adopt");
+            return Ok(None);
+        }
         crate::component::query_adopt_state()
     }
 

src/bootupd.rs

@@ -380,11 +380,7 @@ pub(crate) fn print_status(status: &Status) -> Result<()> {
 
     #[cfg(any(target_arch = "x86_64", target_arch = "aarch64"))]
     {
-        let boot_method = if Path::new("/sys/firmware/efi").exists() {
-            "EFI"
-        } else {
-            "BIOS"
-        };
+        let boot_method = if efi::is_efi_booted()? { "EFI" } else { "BIOS" };
         println!("Boot method: {}", boot_method);
     }
 

src/efi.rs

@@ -63,6 +63,10 @@ impl Efi {
     }
 
     fn open_esp_optional(&self) -> Result<Option<openat::Dir>> {
+        if !is_efi_booted()? && self.get_esp_device().is_none() {
+            log::debug!("Skip EFI");
+            return Ok(None);
+        }
         let sysroot = openat::Dir::open("/")?;
         let esp = sysroot.sub_dir_optional(&self.esp_path()?)?;
         Ok(esp)
@@ -75,6 +79,20 @@ impl Efi {
         Ok(esp)
     }
 
+    fn get_esp_device(&self) -> Option<PathBuf> {
+        let esp_devices = [COREOS_ESP_PART_LABEL, ANACONDA_ESP_PART_LABEL]
+            .into_iter()
+            .map(|p| Path::new("/dev/disk/by-partlabel/").join(p));
+        let mut esp_device = None;
+        for path in esp_devices {
+            if path.exists() {
+                esp_device = Some(path);
+                break;
+            }
+        }
+        return esp_device;
+    }
+
     pub(crate) fn ensure_mounted_esp(&self, root: &Path) -> Result<PathBuf> {
         let mut mountpoint = self.mountpoint.borrow_mut();
         if let Some(mountpoint) = mountpoint.as_deref() {
@@ -94,17 +112,9 @@ impl Efi {
             return Ok(mnt);
         }
 
-        let esp_devices = [COREOS_ESP_PART_LABEL, ANACONDA_ESP_PART_LABEL]
-            .into_iter()
-            .map(|p| Path::new("/dev/disk/by-partlabel/").join(p));
-        let mut esp_device = None;
-        for path in esp_devices {
-            if path.exists() {
-                esp_device = Some(path);
-                break;
-            }
-        }
-        let esp_device = esp_device.ok_or_else(|| anyhow::anyhow!("Failed to find ESP device"))?;
+        let esp_device = self
+            .get_esp_device()
+            .ok_or_else(|| anyhow::anyhow!("Failed to find ESP device"))?;
         for &mnt in ESP_MOUNTS.iter() {
             let mnt = root.join(mnt);
             if !mnt.exists() {
@@ -386,6 +396,9 @@ impl Component for Efi {
     }
 
     fn validate(&self, current: &InstalledContent) -> Result<ValidationResult> {
+        if !is_efi_booted()? && self.get_esp_device().is_none() {
+            return Ok(ValidationResult::Skip);
+        }
         let currentf = current
             .filetree
             .as_ref()