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NAME

       febootstrap-supermin-helper - Reconstruct initramfs from supermin
       appliance.

SYNOPSIS

        febootstrap-supermin-helper supermin.img hostfiles.txt host_cpu kernel initrd
        febootstrap-supermin-helper input [...] host_cpu kernel initrd

DESCRIPTION

       febootstrap-supermin-helper reconstructs a bootable kernel and
       initramfs from a supermin appliance.  First you should be familiar with
       febootstrap(8), febootstrap-to-initramfs(8) and
       febootstrap-to-supermin(8).

PARAMETERS

       Of the four or five required parameters, the first few are input files,
       and the last two are output files.

       "supermin.img" and "hostfiles.txt" are the input files which describe
       the supermin appliance.  (You can also use a directory name here which
       is searched for files).

       "host_cpu" should be the host CPU, eg. "x86_64" or "i686".

       "kernel" and "initrd" are the temporary output files that this script
       produces.  These output files are meant to be used just for booting the
       appliance, and should be deleted straight afterwards.

OPTIONS

       -k file | --kmods file
           If this option is specified, then "file" should be a list of
           wildcards matching kernel module names, eg:

            virtio*.ko
            scsi*.ko
            piix.ko

           In this case, only kernel modules matching those wildcards will be
           included in the output appliance.  Note: You must resolve any
           dependencies yourself as this does not pull in dependent modules
           automatically.

           If this option is not specified, then every kernel module from the
           host will be included.  This is safer, but can produce rather large
           appliances which need a lot more memory to boot.

SPEED

       In libguestfs, on a mid-range Intel-based PC, we reconstruct the
       initramfs using this script in around 1/5th of a second (assuming a
       "hot cache" - it’s rather slower when run the first time on a cold
       cache).

       Some tips to improve performance:

       ·   Use a kernel module whitelist (the "--kmods" option), and only list
           the kernel modules you really need.

       ·   Minimize the appliance, removing as much extraneous junk as
           possible.

           As well as using febootstrap-minimize(8) it is worth checking for
           anything that is not necessary for your particular application and
           removing it by hand.

SEE ALSO

       febootstrap(8), febootstrap-to-initramfs(8),
       febootstrap-to-supermin(8).

AUTHORS

       Richard W.M. Jones <rjones @ redhat . com>

COPYRIGHT

       (C) Copyright 2009-2010 Red Hat Inc.,
       <http://people.redhat.com/~rjones/febootstrap>.

       This program is free software; you can redistribute it and/or modify it
       under the terms of the GNU General Public License as published by the
       Free Software Foundation; either version 2 of the License, or (at your
       option) any later version.

       This program is distributed in the hope that it will be useful, but
       WITHOUT ANY WARRANTY; without even the implied warranty of
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
       General Public License for more details.

       You should have received a copy of the GNU General Public License along
       with this program; if not, write to the Free Software Foundation, Inc.,
       675 Mass Ave, Cambridge, MA 02139, USA.