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Sylvain Alain picture
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''a.k.a. I like my Linux how I like my women... <s>easy to set up</s>flexible.''
 +
 
 +
This is a script to backup and/or transfer a working Funtoo installation onto a fresh install (on the same or a different host).
 +
 
 +
It won't speed up an install and it doesn't make it easier, but with it you can do a single reboot
 +
and have a complete working system without tedious config file editing.
 +
 
 +
==The Script==
 +
 
 +
{| width="100%" cellpadding=0 cellspacing=0 style="margin: .5em 0; background-color: #f2fff2; border: solid 1px #bfffbf;"
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| style="background-color: #c1ffc1; border: solid 1px #a0ffa0; border-bottom: 1px solid #888; font-size: 0.9em" | '''Code:''' /usr/local/bin/transplant
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|-
 +
| style="padding: 0 0.5em; font-family=monospace, fixed; white-space: pre;"|
 +
<tt><nowiki>
 +
#!/bin/bash
 +
# I use heavy amounts of bashisms
 +
# ...see if you can find them all!
 +
 
 +
# Copyright 2010 Daniel Cordero
 +
# Licensed under the GPLv2
 +
 
 +
test "$PWD" = "$HOME" && cd /tmp # I don't clean up after myself
 +
 
 +
# When I say "list", I mean space-separated (ahem... $IFS) list.
 +
NETIF_LIST="" # List of interface initscripts
 +
SERVICES="" # List of services to be placed into default runlevel
 +
HOST_FILES="" # List of host-specific /etc files
 +
ETC_FILES="" # List of generic/shared /etc files
 +
HOME_FILES="" # List of files in $HOME
 +
HOME_FOLDERS="" # List of folders in $HOME
 +
 
 +
mkdir -p etc/{portage/{package.use,savedconfig,profile},runlevels/default}
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mkdir -p etc/init.d
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mkdir -p home/$USER
 +
mkdir -p usr/lib/X11/xdm
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mkdir -p var/lib/portage
 +
mkdir -p host
 +
 
 +
rsync -ar --exclude .keep {/usr/,}local/
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rsync -r /etc/portage/{package.use,savedconfig,profile} etc/portage
 +
 
 +
for service in $SERVICES; do
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ln -sf /etc/init.d/$service etc/runlevels/default/$service
 +
done
 +
 
 +
for netif in $NETIF_LIST; do
 +
ln -sf /etc/init.d/netif.tmpl etc/init.d/netif.$netif
 +
done
 +
 
 +
for home_folder in $HOME_FOLDERS; do
 +
rsync -ra $HOME/$home_folder/ home/$USER/$home_folder
 +
done
 +
 
 +
for home_file in $HOME_FILES; do
 +
cp -a $HOME/$home_file home/$USER/$home_file
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test x"$home_file" = "x.xinitrc" && ln -sf .xinitrc home/$USER/.xsession
 +
done
 +
 
 +
 
 +
for etc_file in $ETC_FILES; do
 +
(test "x$(dirname $etc_file)" != "x." && \
 +
test ! -d "$(dirname $etc_file)") && \
 +
mkdir -p etc/$(dirname $etc_file)
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cp -a /etc/$etc_file etc/$(dirname $etc_file)/$(basename $etc_file)
 +
done
 +
 
 +
for host_file in ${HOST_FILES}; do
 +
(test "x$(dirname $host_file)" != "x." && \
 +
test ! -d "$(dirname $host_file)") && \
 +
mkdir -p host/$(dirname $host_file)
 +
cp -a /etc/$host_file host/$(dirname $host_file)/$(basename $host_file)
 +
done
 +
 
 +
cp -a {/,}usr/lib/X11/xdm/Xsetup_0
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cp -a {/,}var/lib/portage/world
 +
 
 +
tar cf $(hostname)-overlay.tar host/
 +
tar cf usrlocal-overlay.tar local/
 +
tar cf home-overlay.tar home/
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tar cf funtoo-overlay.tar etc/ usr/ var/ \
 +
home-overlay.tar usrlocal-overlay.tar $(hostname)-overlay.tar
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# DESTRUCTIVE
 +
xz funtoo-overlay.tar # non-destructive
 +
</nowiki>
 +
</tt>
 +
|}
 +
 
 +
==Usage==
 +
 
 +
Fill in the 6 variables at the top of the script. You'll constantly be adding more files as the original system gets more customised.
 +
 
 +
When you're ready (or as a cron job), run the script and save the resulting tarball somewhere.
 +
 
 +
Boot your install environment. Partition, format and unpack (or work up to) a stage3. Grab a portage tree.
 +
 
 +
Unpack the main tarball (you probably don't want to unpack the other tarballs yet):
 +
 
 +
{{Root|<nowiki># tar xvJf --exclude "*.tar" funtoo-overlay.tar.xz -C /mnt/gentoo
 +
</nowiki>}}
 +
 
 +
Take a peek at the list of files in $HOST_FILES and edit them to the host's specification.
 +
 
 +
{{Info|You cannot expect every host to have the exact geometry or architecture as the original host. If, by some miracle, the two are exactly alike, go ahead and unpack the host tarball (probably into <tt>/tmp</tt>).}}
 +
 
 +
{{Info|The host tarball uses the prefix <tt>host/</tt> instead of the regular <tt>etc/</tt>. This is for your protection (and a limitation of the script... but mostly protection).}}
 +
 
 +
Chroot in and run (I suggest in a screen, nohup or another VT):
 +
{{Root|<nowiki># env-update; source /etc/profile
 +
# emerge -uDN world</nowiki>}}
 +
 
 +
Wait (or finish configuration). Remember to make a kernel and <tt># boot-update</tt> (and installing the bootloader to MBR if necessary).
 +
 
 +
Add an identical user (it's not in the script, but you might want to save the output of <tt>$ groups</tt>) and unpack <tt>home-overlay.tar</tt>. If you have anything in <tt>usrlocal-overlay.tar</tt> you can unpack that too.
 +
 
 +
{{Info|If you're installing on a different architecture, the contents of <tt>/usr/local</tt> may be useless for your CPU.
 +
If you're lucky, it may be all architecture-independent/interpreted scripts, or nothing at all.}}
 +
 
 +
If all goes well, reboot (and remove the install environment)!

Latest revision as of 14:19, 17 November 2010

a.k.a. I like my Linux how I like my women... easy to set upflexible.

This is a script to backup and/or transfer a working Funtoo installation onto a fresh install (on the same or a different host).

It won't speed up an install and it doesn't make it easier, but with it you can do a single reboot and have a complete working system without tedious config file editing.

The Script

Code: /usr/local/bin/transplant

#!/bin/bash # I use heavy amounts of bashisms # ...see if you can find them all! # Copyright 2010 Daniel Cordero # Licensed under the GPLv2 test "$PWD" = "$HOME" && cd /tmp # I don't clean up after myself # When I say "list", I mean space-separated (ahem... $IFS) list. NETIF_LIST="" # List of interface initscripts SERVICES="" # List of services to be placed into default runlevel HOST_FILES="" # List of host-specific /etc files ETC_FILES="" # List of generic/shared /etc files HOME_FILES="" # List of files in $HOME HOME_FOLDERS="" # List of folders in $HOME mkdir -p etc/{portage/{package.use,savedconfig,profile},runlevels/default} mkdir -p etc/init.d mkdir -p home/$USER mkdir -p usr/lib/X11/xdm mkdir -p var/lib/portage mkdir -p host rsync -ar --exclude .keep {/usr/,}local/ rsync -r /etc/portage/{package.use,savedconfig,profile} etc/portage for service in $SERVICES; do ln -sf /etc/init.d/$service etc/runlevels/default/$service done for netif in $NETIF_LIST; do ln -sf /etc/init.d/netif.tmpl etc/init.d/netif.$netif done for home_folder in $HOME_FOLDERS; do rsync -ra $HOME/$home_folder/ home/$USER/$home_folder done for home_file in $HOME_FILES; do cp -a $HOME/$home_file home/$USER/$home_file test x"$home_file" = "x.xinitrc" && ln -sf .xinitrc home/$USER/.xsession done for etc_file in $ETC_FILES; do (test "x$(dirname $etc_file)" != "x." && \ test ! -d "$(dirname $etc_file)") && \ mkdir -p etc/$(dirname $etc_file) cp -a /etc/$etc_file etc/$(dirname $etc_file)/$(basename $etc_file) done for host_file in ${HOST_FILES}; do (test "x$(dirname $host_file)" != "x." && \ test ! -d "$(dirname $host_file)") && \ mkdir -p host/$(dirname $host_file) cp -a /etc/$host_file host/$(dirname $host_file)/$(basename $host_file) done cp -a {/,}usr/lib/X11/xdm/Xsetup_0 cp -a {/,}var/lib/portage/world tar cf $(hostname)-overlay.tar host/ tar cf usrlocal-overlay.tar local/ tar cf home-overlay.tar home/ tar cf funtoo-overlay.tar etc/ usr/ var/ \ home-overlay.tar usrlocal-overlay.tar $(hostname)-overlay.tar # DESTRUCTIVE xz funtoo-overlay.tar # non-destructive

Usage

Fill in the 6 variables at the top of the script. You'll constantly be adding more files as the original system gets more customised.

When you're ready (or as a cron job), run the script and save the resulting tarball somewhere.

Boot your install environment. Partition, format and unpack (or work up to) a stage3. Grab a portage tree.

Unpack the main tarball (you probably don't want to unpack the other tarballs yet):

# tar xvJf --exclude "*.tar" funtoo-overlay.tar.xz -C /mnt/gentoo


Take a peek at the list of files in $HOST_FILES and edit them to the host's specification.

You cannot expect every host to have the exact geometry or architecture as the original host. If, by some miracle, the two are exactly alike, go ahead and unpack the host tarball (probably into /tmp).


The host tarball uses the prefix host/ instead of the regular etc/. This is for your protection (and a limitation of the script... but mostly protection).


Chroot in and run (I suggest in a screen, nohup or another VT):

# env-update; source /etc/profile # emerge -uDN world


Wait (or finish configuration). Remember to make a kernel and # boot-update (and installing the bootloader to MBR if necessary).

Add an identical user (it's not in the script, but you might want to save the output of $ groups) and unpack home-overlay.tar. If you have anything in usrlocal-overlay.tar you can unpack that too.

If you're installing on a different architecture, the contents of /usr/local may be useless for your CPU. If you're lucky, it may be all architecture-independent/interpreted scripts, or nothing at all.


If all goes well, reboot (and remove the install environment)!

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