-#!/bin/bash
+#!/bin/sh
#
-# A script to prepare the tiniest "linux system". It's a kernel and an
-# initrd within a FAT with a syslinux boot loader. The initrd contains
-# a fully expanded busybox and uses /bin/sh as its init.
-#
-# This script creates and packs that initrd, as well as the whole,
-# boot image.
-
-set -e
-
-echo '### Step 1. Download original Packages files from sources'
-mkdir -p save
-[ -L save/save ] || ln -s . save/save
-MAPFILE=save/mapfile.txt
-DEPFILE=save/mapdepends.txt
-
-REPOS=(
- deb.devuan.org/merged_daedalus_main
- deb.devuan.org/merged_ceres_main
-)
-ARCH="amd64"
-MBR=dos # gpt
-
-: > $MAPFILE
-: > $DEPFILE
+# This is the "main" script for preparing an ISO.
-for REPO in ${REPOS[@]} ; do
- W=( ${REPO//_/ } )
- SUITE=${W[1]}
- SECTION=${W[2]}
-
- PKGFILE=save/${W[0]/\//_}_${SUITE}_${SECTION}_binary-${ARCH}_Packages
- if [ ! -r $PKGFILE ] ; then
- XZSRC="http://${W[0]}/dists/$SUITE/$SECTION/binary-$ARCH/Packages.xz"
- echo "$XZSRC"
- wget -qO - $XZSRC | xzcat - > ${PKGFILE}
- fi
-
- echo '# Reduce Packages file into two maps for filename and depends'
- echo "# ..creating $MAPFILE and $DEPFILE"
- awk -v MAP=$MAPFILE -v DEP=$DEPFILE '
- BEGIN { print "###" >> MAP; print "###" >> DEP; }
-$1=="Package:" {P=$2; next}
-$1=="Pre-Depends:" {print P,$0 >> DEP;next }
-$1=="Depends:" {print P,$0 >> DEP;next }
-$1=="Filename:" {print P,$2 >> MAP;next }
-' ${PKGFILE}
-done
+export APT_CONFIG=repo.conf
-# Append any additional saved deb files
-for DEB in save/*.deb ; do
- P="${DEB%%_*}"
- P="${P#save/}"
- echo "$P save/$DEB" >> $MAPFILE
- dpkg-deb -f "$DEB" Depends Pre-Depends | sed "s/^/$P/" >> $DEPFILE
-done
+# Update the repository package indexes as needed
+apt-get update
-# Function to find the filename for a given package in the given mapfile
-maplookup() {
- local FN=${3:-tail}
- echo "maplookup $1 $2" >&2
- grep "^$1 " $2 >&2
- grep "^$1 " $2 | $FN -n 1 | sed 's/[^ ]* //'
-}
+# Prepare the initrd filesystem, containing a linux kernel with all
+# modules, a busybox-static as OS platform, and an init script
-# Function to clean up a "depends' line
-depclean() {
- sed 's/^[^:]*: //;s/([^)]*)//g;s/|[^,]*/ /g;s/,/ /g;s/\s\+/ /g'
+# Download a package into deb/
+download() {
+ apt-get download $1
+ mv repo/$(pwd)/$1_* deb/ || exit 1
}
-# Map all dependencies for a list of package
-#
-mapdeps() {
- local D
- local B=( )
- local X=" $* "
- for D in $* ; do
- local A=(
- $(grep "^$D Pre-Depends:" $DEPFILE | head -n 1 | depclean)
- $(grep "^$D Depends:" $DEPFILE | head -n 1 | depclean)
- )
- for P in ${A[@]} ; do
- [ -z "${X%%* $P *}" ] && continue
- B=( $B $P )
- X="$X$P "
- done
- done
- if [ -z "$B" ] ; then
- echo $X
- else
- mapdeps $X
- fi
+# Show meta attribute $1 for package $2, with newline between values
+#
+showdata() {
+ cat repo/var/lib/apt/lists/*_Packages | \
+ sed "1,/^Package: $2/d;/^$1: /!d;s|$1: ||;s|([^)]*)||g;q" | \
+ tr , '\012'
}
-# Function to download a deb file and return its name
-debfile() {
- local FN=${2-tail}
- local F="$(maplookup $1 $MAPFILE $FN)"
- local P="${F##*/}"
- if [ ! -e "save/$P" ] ; then
- for REPO in ${REPOS[@]} ; do
- echo "download http://${REPO%%_*}/$F" >&2
- ( cd save && wget -q "http://${REPO%%_*}/$F" ) && break
- ls -l save/$P >&2
- done || return 1
+# Unpack a deb $1 "manually" with $2 as root, ignoring dependencies
+unpack() {
+ echo "unpack $1 [begin]"
+ local DEB=$(ls deb/${1}_* 2>/dev/null)
+ if [ -z "$DEB" ] ; then
+ download $1
+ DEB=$(ls deb/${1}_* 2>/dev/null)
+ if [ -z "$DEB" ] ; then
+ echo "** Cannot download $1" >&2
+ exit 1
+ fi
fi
- echo "save/$P"
-}
-
-# Function to extract from a deb without executing and pre/post scripts
-# $1 = rootfs $2 = package
-debextract() {
- ar p $2 data.tar.xz | tar xJf - -C $1
-}
-
-# Deteremine which kernel to use; this is
-echo "# Determine kernel"
-KERNEL="$(maplookup linux-image-amd64 $DEPFILE head | \
- sed 's/.*\(linux-image[^ ]*\).*/\1/')"
-echo "# ... $KERNEL"
-
-echo '### Step 2. Create and populate the initrd, and packit up.'
-# The initrd contains only a few kernel modules for coping with a
-# later pivoting onto a "full" filesystem.
-
-echo "# Create initrd filesystem"
-rm -fr initrd
-
-# Helper function to copy a file or link, given full path
-# $1 = full pathname, $2 = (relative) root path
-copylinks() {
- echo "copylinks $*" >&2
- [ -e "initrd/$1" ] && return 0
- mkdir -p "initrd${1%/*}"
- if [ -L "$1" ] ; then
- local L=$(readlink $2$1)
- ln -s $L initrd$1
- [ "${L:0:1}" = "/" ] || L="${1%/*}/$L"
- copylinks $L $2
- else
- cp $2$1 initrd/$1
- fi
-}
-
-# Helper function to copy dynamic binary and its libraries
-# $1 = full pathname, $2 = (relative) root path
-bincp() {
- echo "bincp $*" >&2
- [ -e "initrd/$1" ] && return 0
- copylinks $1 $2
- objdump -x $2$1 | while read A B ; do
- [ "$A" == "NEEDED" ] || continue
- local L="$(find ${2:-/} -name $B)"
- [ -z "$L" ] && echo "MISSING $B" && exit 1
- copylinks ${L#$2} $2
- done
+ ar p $DEB data.tar.xz | tar xJf - --keep-directory-symlink -C $2
+ echo "unpack $1 [end]"
}
-echo '# Include static vtoydump for Ventoy support'
-VTOYDUMP=../ventoy/vtoydump/vtoydump
-if [ -e "$VTOYDUMP" ] ; then
- mkdir -p initrd/bin
- cp "$VTOYDUMP" initrd/bin
-fi
-
-echo "# Extract static busybox, and fluff it up for more utilities"
-mkdir -p initrd
-debextract initrd $(debfile busybox-static head)
-for L in $(initrd/bin/busybox --listfull) ; do
- mkdir -p $(dirname initrd/$L)
- [ -e "initrd/$L" ] && continue
- case "$L" in
- bin/busybox) : ;;
- usr/*) ln -s ../../bin/busybox initrd/$L ;;
- sbin/*) ln -s ../bin/busybox initrd/$L ;;
- bin/*) ln -s busybox initrd/$L ;;
- linuxrc) ln -s bin/busybox initrd/$L ;;
- esac
-done
-
-echo "# Extract the kernel package ($KERNEL)"
-echo "# .. and syslinux stuff if needed"
-if [ ! -d kernel ] ; then
- mkdir kernel
- debextract kernel $(debfile $KERNEL head)
- debextract kernel $(debfile squashfs-tools head)
- debextract kernel $(debfile syslinux)
- debextract kernel $(debfile syslinux-common)
- debextract kernel $(debfile syslinux-efi)
- debextract kernel $(debfile syslinux-utils)
- debextract kernel $(debfile isolinux)
-fi
-
-echo "# Include some kernel modules in the initrd"
-MODULES=(
- # disk
- scsi_common scsi_mod libata ata_piix ata_generic cdrom sr_mod
- crc32-pclmul crct10dif_common crc-t10dif crc64 crc64-rocksoft
- t10-pi sd_mod sg
- nls_cp437 nls_ascii fat vfat
- crc32c_generic jbd2 mbcache crc16 ext4
- usb-storage usbcore usb-common xhci-pci xhci-hcd
- isofs exfat loop
- efivarfs
- # input
- psmouse evdev
- # network
- e1000
- # overlay
- overlay squashfs
-)
-MOODLES=""
-B=$(pwd)
-for m in ${MODULES[@]} ; do
- km=$(find kernel/lib/modules -name $m.ko)
- if [ -z "$km" ] ; then
- echo "Missing module $m"
- continue
- fi
- im=initrd/${km#kernel/}
- MOODLES+=" $B/$im"
- mkdir -p $(dirname $im)
- cp -n $km $im
-done
-V=${KERNEL#linux-image-}
-mkdir -p initrd/boot initrd/lib/modules/$V
-cp kernel/boot/System.map-$V initrd/
-cp kernel/lib/modules/$V/modules.order initrd/lib/modules/$V/
-cp kernel/lib/modules/$V/modules.builtin initrd/lib/modules/$V/
-depmod -F initrd/System.map-$V -b initrd $V $MOODLES
-
-echo "# setup a scripted init. The kernel runs this via the #! interpreter"
-rm -f initrd/sbin/init # just in case
-cp init/init initrd/init
-chmod a+x initrd/init
-
-echo "# Declare password-less root"
-mkdir -p initrd/etc
-echo 'root::0:0:root:/root:/bin/bash' > initrd/etc/passwd
-
-echo "# Now pack up that initrd as initrd.gz"
-( cd initrd ; find . | fakeroot cpio -H newc -o | gzip ) >initrd.gz
-
-echo '### Step 3. create a 32 Mb fat filesystem with bios and UEFI boot'
-rm -f bootimage.raw
-dd if=/dev/zero of=bootimage.raw bs=32M count=1
-
-# Prepare a gpt/dos partition table with a first partition marked as EFI
-sfdisk bootimage.raw <<EOF
-label: $MBR
-
-2048 32767 U *
-- - L
-EOF
-
-# Add a fat filesystem at 2048 61440
-mkfs.fat -n TINIEST --offset 2048 -F 16 bootimage.raw
-IMG="-i bootimage.raw@@$((2048*512))"
-
-# Add an ext2 filesystem at offset 34816*512
-# Copy initrd.gz and kernel into the fat filesystem root
-EXT=offset=$((34816*512))
-mke2fs -t ext4 -E $EXT -F bootimage.raw 15M
-
-mcopy $IMG initrd.gz ::
-mcopy $IMG kernel/boot/vm* ::/vmlinuz
-mcopy $IMG splash.png ::/
-
-mmd $IMG ::/boot
-mmd $IMG ::/boot/syslinux
-mmd $IMG ::/boot/syslinux/bios
-mcopy $IMG \
- kernel/usr/lib/syslinux/modules/bios/* ::/boot/syslinux/bios
-mcopy $IMG syslinux-legacy.cfg ::/syslinux.cfg
-
-syslinux --install --offset=${IMG#*@@} bootimage.raw
-mmd $IMG ::/EFI
-mmd $IMG ::/EFI/BOOT
-mcopy $IMG kernel/usr/lib/SYSLINUX.EFI/efi64/syslinux.efi \
- ::/EFI/BOOT/bootx64.efi
-mcopy $IMG \
- kernel/usr/lib/syslinux/modules/efi64/* ::/EFI/BOOT
-mcopy $IMG syslinux-uefi.cfg ::/EFI/BOOT/syslinux.cfg
-## Add lua boot script
-mcopy $IMG muffin.lua ::/EFI/BOOT/muffin.lua
-
-case "$MBR" in
- dos) MBRBIN=mbr.bin ;;
- gpt)
- MBRBIN=gptmbr.bin
- sfdisk --relocate gpt-bak-std bootimage.raw
- sfdisk -f --part-attrs bootimage.raw 1 LegacyBIOSBootable
- ;;
- *) exit 1 ;;
-esac
-dd conv=notrunc of=bootimage.raw bs=440 count=1 \
- if=kernel/usr/lib/syslinux/mbr/$MBRBIN
-
-echo "# populate the extra partition"
-if [ -d extra ] ; then
- mkdir -p X
- fuse2fs -o fakeroot -o$EXT bootimage.raw X
- rsync -r extra/. X/.
- umount X
-fi
-
-exit
+mkdir -p initrd deb
+echo $(showdata Depends linux-image-amd64)
+KERNEL=$(showdata Depends linux-image-amd64)
+unpack $KERNEL initrd
+unpack busybox-static initrd
projects / rrq / tiniest.git / commitdiff