Remove root= cmdline for sdboot

Signed-off-by: Pragyan Poudyal <pragyanpoudyal41999@gmail.com>

Author: Johan-Liebert1

crates/lib/src/bootc_composefs/boot.rs

@@ -68,7 +68,7 @@ use std::path::Path;
 
 use anyhow::{Context, Result, anyhow, bail};
 use bootc_blockdev::find_parent_devices;
-use bootc_kernel_cmdline::utf8::{Cmdline, Parameter};
+use bootc_kernel_cmdline::utf8::{Cmdline, Parameter, ParameterKey};
 use bootc_mount::inspect_filesystem_of_dir;
 use bootc_mount::tempmount::TempMount;
 use camino::{Utf8Path, Utf8PathBuf};
@@ -566,6 +566,12 @@ pub(crate) fn setup_composefs_bls_boot(
         }
     };
 
+    // Remove "root=" from kernel cmdline as systemd-auto-gpt-generator should use DPS
+    // UUID
+    if bootloader == Bootloader::Systemd {
+        cmdline_refs.remove(&ParameterKey::from("root"));
+    }
+
     let is_upgrade = matches!(setup_type, BootSetupType::Upgrade(..));
 
     let current_root = if is_upgrade {