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Gentoo minimal initramfs (5 Mb) + joe tip
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gonaked
n00b
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Joined: 29 Aug 2009
Posts: 3

PostPosted: Mon Aug 31, 2009 7:34 pm    Post subject: Gentoo minimal initramfs (5 Mb) + joe tip Reply with quote

Code:
#!/bin/bash
# Gentoo minimal initramfs build script (kernels without module support assumed)
#  D=locationdir  P=portagedir   (W=workdir1 B=binarypackages I=workdir2)
D=/root/gentooembedded && P=/usr/portage && W=$D/gem && B=$D/pkg && I=$D/initrd
# merge to your build environment first, THEN merge to initramfs
ARCH="x86" && CFLAGS="-Os -march=i486 -pipe" && CHOST="i486-pc-linux-gnu"
USE="glibc-omitfp ipv6 minimal unicode nonfsv4 -cracklib -nls -tcpd" && EXTRA=""
KEYMAP="us" && NAMESERVER="192.168.1.1" && NFS_OPTION="nfsmount" # or "nfs"
WANT_DHCP=false && WANT_NFS=false && WANT_JOE=true && WANT_LINKS=false
KEEP_W=false && STRIP_GLIBC=true && NO_DOCS=true && NO_COREUTILS=true
merge_more_stuff () { false;
# emerge -bDkN --root=$W --config-root=$W --root-deps=rdeps jfsutils || exit
}; extra_code () { false; } # for ex. copy kernel modules over to workdir1
# build system to W
if [ -d $W ]; then rm -r $W; fi && mkdir -p $W/{usr,etc}/portage $B
cp -a $P/profiles $W/usr/portage || exit; RD=--root-deps=rdeps
ln -s ../usr/portage/profiles/embedded $W/etc/make.profile ; echo -e 'ARCH="'\
$ARCH'"\nACCEPT_KEYWORDS="${ARCH}"\nCFLAGS="'$CFLAGS'"\nCXXFLAGS="${CFLAGS}"
CHOST="'$CHOST'"\nUSE="'$USE'"\nPKGDIR="'$B'"\n'$EXTRA > $W/etc/make.conf
echo 'sys-apps/busybox static -make-symlinks' > $W/etc/portage/package.use
emerge -bDkN --{,config-}root=$W $RD busybox baselayout util-linux \
 procps udev kbd e2fsprogs gawk && cd $W/dev &&./MAKEDEV generic || exit
if [[ $ARCH == *64* ]]; then ln -s lib $W/lib64 && ln -s lib $W/usr/lib64; fi
emerge -bkNO --{,config-}root=$W $RD glibc || exit ; chmod 1777 $W/tmp
if $WANT_DHCP; then emerge -bDkN --{,config-}root=$W $RD dhcpcd || exit
 echo 'config_eth0=( "dhcp" )' > $W/etc/conf.d/net
 echo 'nameserver '$NAMESERVER > $W/etc/resolv.conf
 ln -s /etc/init.d/net.eth0 $W/etc/runlevels/default/net.eth0
else echo 'config_eth0=( "null" )' > $W/etc/conf.d/net; fi
if $WANT_JOE; then emerge -bDkN --{,config-}root=$W $RD joe || exit
 sed -i 's:/bin/nano:/usr/bin/joe:' $W/etc/rc.conf
 echo 'alias joe='\''joe -nobackups'\' > $W/root/.profile; fi
if $WANT_LINKS; then emerge -bDkN --{,config-}root=$W $RD links || exit; fi
if $WANT_NFS; then emerge -bDkN --{,config-}root=$W $RD shadow || exit
 emerge -bDkNo --{,config-}root=$W $RD nfs-utils || exit
 ln -snf ../usr/portage/profiles/default/linux/$ARCH/10.0 $W/etc/make.profile
 emerge -bDkN --{,config-}root=$W $RD nfs-utils || exit
 ln -snf ../usr/portage/profiles/embedded $W/etc/make.profile
 ln -s /etc/init.d/$NFS_OPTION $W/etc/runlevels/default/$NFS_OPTION; fi
echo 'tmpfs / tmpfs defaults 0 0' > $W/etc/fstab ; merge_more_stuff
if $NO_COREUTILS; then emerge -C --{,config-}root=$W coreutils || exit; fi
cd $W && find ./var/db/pkg -type d | cut -d '/' -f 5,6 | grep "\/" > $W/tmp/p
rm -r $W/{usr,etc}/portage $W/etc/make.profile $W/var/{db/*,cache}
mv $W/tmp/p $W/var/db/pkg.list && touch $W/etc/{mtab,etc-update.conf,ntp.conf}
tar -xpf $W/usr/share/busybox/busybox-links.tar -C $W/tmp
rm $W/tmp/bin/{find,xargs} && cp -an $W/tmp/bin/* $W/bin # findutils
cp -an $W/tmp/sbin/* $W/sbin && rm -r $W/tmp/* && if $STRIP_GLIBC; then
 rm -r `find $W -name *.a` $W/usr/{lib/gconv,include,share/i18n}; fi
if $NO_DOCS; then rm -r $W/usr/share/{doc,info,man}; fi
if [[ $KEYMAP == "us" ]]; then # strip down to US qwerty
 rm -r $W/usr/share/{consolefonts/{[!d]*,dr*},consoletrans/*}
 rm -r $W/usr/share/keymaps/{[!i]*,i386/{[!iq]*,q*z,qwerty/{[!u]*,u[!s]*}}}
else sed -i 's/"us"/"'$KEYMAP'"/' $W/etc/conf.d/keymaps; fi
if $WANT_NFS; then echo -e '#!/bin/bash\ngroupadd -g 111 rpc
 useradd -u 111 -g 111 -d /dev/null -s /sbin/nologin rpc\npasswd' > $W/t && \
 chmod 700 $W/t && chroot $W /bin/bash -c './t && exit' && rm $W/t
else chroot $W /bin/bash -c 'passwd && exit'; fi ; extra_code
# build initramfs to I
if [ -d $I ]; then rm -r $I; fi && mkdir -p $I/{bin,etc,proc,sys,tmpfs}
cp -a $W/bin/busybox $I/bin && touch $I/etc/mtab && echo 'Compressing ...'
cd $W && tar -cpf $I/tmpfs.tar * && lzma -9 $I/tmpfs.tar && echo -e \
'#!/bin/busybox sh\nmount -t proc proc /proc && mount -t sysfs sysfs /sys
mount -t tmpfs -o rw tmpfs /tmpfs && unlzma -c /*.lzma | tar -xpC /tmpfs
mount -o remount,ro /tmpfs && umount /proc /sys && rm -r /*.lzma /proc /sys
exec switch_root /tmpfs /sbin/init' > $I/init && chmod +x $I/init
cd $I && find . -print0 | cpio -0o --format=newc > $W/initramfs.cpio
gzip -9 $W/initramfs.cpio && rm -r $I/* && mv $W/initramfs.cpio.gz $I
cut -d '/' -f 2 $W/var/db/pkg.list | sort | awk 'BEGIN {FS="-"; printf \
 "\n* \033[01;32m"}; {printf $1; for (n=2 ; n<=NF ; n++) if ($n !~ /[0-9]/) \
 printf "-" $n; printf "\033[00m * \033[01;32m"};END {printf "\033[00m\n\n"}'
if ! $KEEP_W; then rm -r $W; fi && echo 'Done. >>> '$I'/initramfs.cpio.gz <<<'
######################## LILO
#image=/path/kernel
# initrd=/path/initramfs.cpio.gz
# read-only
# root=/dev/initramfspartition
######################## LILO

Joe's most used commands:
ctrl-c kill window without save......ctrl-e edit file in window......ctrl-a goto beginning of line......ctrl-k h enter and exit help
ctrl-k x save and kill window......ctrl-k d save window......ctrl-e goto end of line......esc-"." help next box
ctrl-k b begin text selection......ctrl-k o split window in two......ctrl-j cut to the end of line......esc-"," help previos box
ctrl-k k end text selection......ctrl-k n goto next window......ctrl-k u goto beginning of window......esc-s find forward
ctrl-k c copy selected text......ctrl-k p goto previos window......ctrl-k v goto end of window......esc-r find backward
ctrl-k m move selected text......ctrl-y delete line......ctrl-k f replace text (followed by operation: i=just find r=replace etc)
ctrl-k y delete selected text ......esc-y undelete line......ctrl-l repeat last find......ctrl-k "\" n repeat n times next command
ctrl-"_" or ctrl-shift-"_" undo......ctrl-"^" or ctrl-shift-"^" redo......ctrl-k z is "ctrl-z" stop to shell......ctrl-d delete
You may also want put - alias joe='joe -nobackups' - to your .profile if root .bashrc if user.
Need fast copying of some text in file1 to file2 and file3. Check this out:
Code:
joe file1 file2 file3

Easy linux partition backup with initramfs:
Code:
mkdir /from /to && mount /dev/partitiontobackup /from && mount /dev/partitionusb /to && cd /from && \
tar -cjpf /to/backup.tar.bz2 * && cd / && umount /from /to

Restore:
Code:
mkdir /from /to && mount /dev/partitionusb /from && mount /dev/partitiontorestore /to && rm -r /to/* && \
tar -xjpf /from/backup.tar.bz2 -C /to && umount /from /to


Last edited by gonaked on Fri Oct 23, 2009 4:28 pm; edited 79 times in total
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judepereira
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Joined: 19 Jan 2008
Posts: 179
Location: Portage, yes, somewhere out there

PostPosted: Tue Sep 01, 2009 3:23 am    Post subject: Reply with quote

I'm sorry, but what exactly does this script do? I followed it through. Why have you made it rewrite the whole make.conf? If any inexperienced user runs this script, it will screw up all the apps he/she installs as it rewrites the make.conf which is critical to a Gentoo System.
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Jude Pereira
(http://judepereira.com)
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mikegpitt
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Joined: 22 May 2004
Posts: 3200

PostPosted: Tue Sep 01, 2009 3:51 am    Post subject: Reply with quote

judepereira wrote:
I'm sorry, but what exactly does this script do? I followed it through. Why have you made it rewrite the whole make.conf? If any inexperienced user runs this script, it will screw up all the apps he/she installs as it rewrites the make.conf which is critical to a Gentoo System.
I think he's only copying over the make.conf into the initramfs, so it wouldn't affect what is on a users harddrive. I am a bit confused why there is a make.conf inside an initramfs though, as well as a make.profile. The initramfs only has the job of booting the system, which means stuff like that shouldn't be necessary.

BTW - Those who want to edit the initramfs that is generated though genkernel (or any other one for that matter) should take a look at a script called convinitrd on this thread:
https://forums.gentoo.org/viewtopic-t-452378.html

I've been using it for years to make small edits to the default initramfs.
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gonaked
n00b
n00b


Joined: 29 Aug 2009
Posts: 3

PostPosted: Tue Sep 01, 2009 5:59 am    Post subject: Why this script? Why embedded profile? Why new make.conf? Reply with quote

Initramfs is good for transferring binarys from fast to old pc and it also serves as a rescue
system. Embedded (aka empty) profile is perfect for building compact systems since it doesn't
pull in anything. :D Suppose your CFLAGS on environment with toolchain(gcc): -march=k8.
With --config-root you tell to use new make.conf in work dir1 to build binarys for i486 not k8.


Last edited by gonaked on Mon Sep 07, 2009 12:42 pm; edited 8 times in total
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