system-reinstall-bootc: Do not warn on unmounted LVM volumes

If the system has a swap partition (or any other volume which is not
currently mounted) the `findmnt` command will (expectedly) fail to
find it.  Don't early exit in this case, instead just ignore that
volume.  If it wasn't mounted in the first place, we don't need to
warn about it being unmounted after the reinstall operation is
complete.

Signed-off-by: John Eckersberg <[email protected]>
Closes: #1659

Author: jeckersb

crates/system-reinstall-bootc/src/lvm.rs

@@ -63,14 +63,14 @@ pub(crate) fn check_root_siblings() -> Result<Vec<String>> {
         })
         .flat_map(|root_lv| parse_volumes(Some(root_lv.vg_name.as_str())).unwrap_or_default())
         .try_fold(Vec::new(), |mut acc, r| -> anyhow::Result<_> {
-            let mount = run_findmnt(&["-S", &r.lv_path], None)?;
+            let mount = run_findmnt(&["-S", &r.lv_path], None).unwrap_or_default();
             let mount_path = if let Some(fs) = mount.filesystems.first() {
                 &fs.target
             } else {
                 ""
             };
 
-            if mount_path != "/" {
+            if mount_path != "/" && !mount_path.is_empty() {
                 acc.push(format!(
                     "Type: LVM, Mount Point: {}, LV: {}, VG: {}, Size: {}",
                     mount_path, r.lv_name, r.vg_name, r.lv_size