[archiso] Make fstab from initramfs

This is needed for initscripts 2012.01, at least the entry for /.
Otherwise / is remounted ro, but not remounted rw later.
Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386@yahoo.com.ar>

archiso/hooks/archiso

@@ -22,16 +22,17 @@ _make_loop_dev() {
     echo /dev/loop${loop_dev_count}
 }
 
-# args: source, mountpoint
+# args: source, newroot, mountpoint
 _mnt_fs() {
     local img="${1}"
-    local mnt="${2}"
+    local newroot="${2}"
+    local mnt="${3}"
     local img_fullname="${img##*/}";
     local img_name="${img_fullname%%.*}"
     local dm_snap_name="${dm_snap_prefix}_${img_name}"
     local ro_dev ro_dev_size ro_dev_fs_type rw_dev
 
-    mkdir -p "${mnt}"
+    mkdir -p "${newroot}${mnt}"
 
     _next_loop_dev
     ro_dev=$(_make_loop_dev "${img}")
@@ -60,10 +61,12 @@ _mnt_fs() {
 
     echo "0 ${ro_dev_size} snapshot ${ro_dev} ${rw_dev} ${cow_persistent} 8" | dmsetup create ${dm_snap_name}
 
-    msg ":: Mounting '/dev/mapper/${dm_snap_name}' (${ro_dev_fs_type}) to '${mnt}'"
-    if ! mount -t "${ro_dev_fs_type}" "/dev/mapper/${dm_snap_name}" "${mnt}" ; then
-        echo "ERROR: while mounting '/dev/mapper/${dm_snap_name}' to '${mnt}'"
+    msg ":: Mounting '/dev/mapper/${dm_snap_name}' (${ro_dev_fs_type}) to '${newroot}${mnt}'"
+    if ! mount -t "${ro_dev_fs_type}" "/dev/mapper/${dm_snap_name}" "${newroot}${mnt}" ; then
+        echo "ERROR: while mounting '/dev/mapper/${dm_snap_name}' to '${newroot}${mnt}'"
         launch_interactive_shell
+    else
+        echo "/dev/mapper/${dm_snap_name} ${mnt} auto defaults 0 0" >> ${newroot}/etc/fstab
     fi
 }
 
@@ -214,7 +217,7 @@ archiso_mount_handler() {
         [[ "${aitab_arch}" != "any" && "${aitab_arch}" != "${arch}" ]] && continue
         if [[ "${aitab_fs_type}" != "none" ]]; then
             _mnt_sfs "/run/archiso/bootmnt/${archisobasedir}/${aitab_arch}/${aitab_img}.fs.sfs" "/run/archiso/sfs/${aitab_img}"
-            _mnt_fs "/run/archiso/sfs/${aitab_img}/${aitab_img}.fs" "${newroot}${aitab_mnt}"
+            _mnt_fs "/run/archiso/sfs/${aitab_img}/${aitab_img}.fs" "${newroot}" "${aitab_mnt}"
         else
             _mnt_sfs "/run/archiso/bootmnt/${archisobasedir}/${aitab_arch}/${aitab_img}.sfs" "${newroot}${aitab_mnt}"
         fi