lfs initramfs init.in for rootwait

README.md

https://www.linuxfromscratch.org/blfs/view/stable/postlfs/initramfs.html

apply the patch with patch /usr/share/mkinitramfs/init.in < init.in.patch

^{if that appears as &lt; instead, it's not, it's left arrow <}

init.in.patch

--- init.in.a
+++ init.in.b
@@ -40,10 +40,16 @@
       ""        ) echo "No root device specified." ; problem ;;
    esac
 
-   while [ ! -b "$device" ] ; do
-       no_device $device
-       problem
-   done
+   if [ -z "$rootwait" ] ; then
+      while [ ! -b "$device" ] ; do
+         no_device $device
+         problem
+      done
+   else
+      until [ -b "$device" ] ; do
+         sleep 0.005
+      done
+   fi
 
    if ! mount -n -t "$rootfstype" -o "$rootflags" "$device" /.root ; then
        no_mount $device
@@ -93,6 +99,7 @@
     rootflags=* ) rootflags=${param#rootflags=}   ;;
     resume=*    ) resume=${param#resume=}         ;;
     noresume    ) noresume=true                   ;;
+    rootwait    ) rootwait=true                   ;;
     ro          ) ro="ro"                         ;;
     rw          ) ro="rw"                         ;;
   esac