Add options for;

- disk to be created (blank disk given to live-bootstrap) (default)
- disk to already exist but sources downloaded within live-bootstrap
- sources to be downloaded outside live-bootstrap (non-blank disk given
  to live-bootstrap)

Also migrate sysb to use sys_transfer in QEMU mode also.

Note that this means copy_sysc is now irrelevant. sysc is *always*
sourced from sysa.

sysb/run.sh

@@ -34,10 +34,15 @@ create_hdx
 ask_disk() {
     echo
     echo "What disk would you like to use for live-bootstrap?"
-    echo "(live-bootstrap assumes you have pre-prepared the disk)."
-    echo "Please provide in format sdxx (as you would find under /dev)."
+    echo "This disk may have pre-prepared sources on it."
+    echo "If there is no partition we will make one".
+    echo "Please provide in format sdxx (as you would find under /dev),"
+    echo "or sdx if it is a blank disk. An ext4 partition is expected on"
+    echo "existing disks."
     echo "You can type 'list' to get a list of disks to help you figure"
     echo "out which is the right disk."
+    echo "NO WARRANTY IS PROVIDED FOR BUGGY BEHAVIOUR, INCLUDING THAT"
+    echo "REGARDING DISKS & DATA."
     echo
     read -r DISK
 
@@ -57,6 +62,15 @@ if [ -z "${DISK}" ] || ! [ -e "/dev/${DISK}" ]; then
     echo "DISK=${DISK}" >> /usr/src/bootstrap.cfg
 fi
 
+if [ -z "$(fdisk -l "/dev/${DISK}" | grep -E "${DISK}p?[0-9]")" ]; then
+    echo "Creating partition table and partition"
+    echo ";" | sfdisk "/dev/${DISK}"
+    mkfs.ext4 "/dev/${DISK}1"
+    DISK="${DISK}1"
+fi
+
+echo "export DISK=${DISK}" >> /usr/src/bootstrap.cfg
+
 PREFIX=/usr
 SOURCES="${PREFIX}/src"
 SYSC=/sysc
@@ -68,7 +82,7 @@ mount -t ext4 "/dev/${DISK}" /sysc
 
 # Copy over appropriate data
 echo "Copying data into sysc"
-sys_transfer "${SYSC}" gzip patch
+sys_transfer "${SYSC}" /sysc_src gzip patch
 sync
 
 # switch_root into sysc 1. for simplicity 2. to avoid kexecing again