rdcore: fail if system has more than 1 boot partition

Signed-off-by: Nikita Dubrovskii <nikita@linux.ibm.com>

Author: nikita-dubrovskii

src/bin/rdcore/rootmap.rs

@@ -27,6 +27,10 @@ use libcoreinst::runcmd_output;
 use crate::cmdline::*;
 
 pub fn rootmap(config: &RootmapConfig) -> Result<()> {
+    // fail if we have more than 1 partition with boot label
+    if !check_single_partition("boot")? {
+        bail!("System has several partitions with boot label. Please 'wipefs' other disks");
+    }
     // get the backing device for the root mount
     let mount = Mount::from_existing(&config.root_mount)?;
     let device = PathBuf::from(mount.device());