3 # Utility script to debootstrap a minbase filesystem, with additions
4 # of kernel, busybox and an init script. Then make an initrd.gz from
5 # that and prepare a boot image file with syslinux from that.
7 if [ $(id -u) -ne 0 ] ; then
8 exec sudo env http_proxy=$http_proxy $0 $*
9 echo "** Abort: must be root" >&2
14 ARCH="${1-$(dpkg-architecture -q DEB_HOST_ARCH)}"
16 IMG=${3-boot-$DIST-$ARCH.img}
22 if [ -d "$FS" ] ; then
23 select x in "keep existing $FS and skip debootstrap" \
24 "remove existing $FS and debootstrap anew" \
26 [ "$x" = abort ] && exit 1
29 echo "selection: $REPLY"
30 [ "$REPLY" = 1 ] && DEBSTRAP=false
35 for d in bin sbin lib ; do mkdir $1/usr/$d ; ln -s usr/$d $1/$d ; done
39 ## Optionally add the stupid-links
40 read -n 1 -p "prime $FS with stupid-links? [Yn]" x
41 [ "$x" = "n" ] && USRMERGE=false
43 rm -rf "$FS" # remove if existin
45 $USRMERGE && stupid_links "$FS"
47 ## bootstrap a filesystem, with exclusions
48 echo "http_proxy=$http_proxy debootstrap ..."
49 debootstrap --exclude=logrotate,cron,cron-daemon-common \
50 --arch=$ARCH $DIST "$FS" http://deb.devuan.org/merged
51 chroot "$FS" apt-get install -y logrotate cron
53 ## Select and add a kernel
54 KERNELS=( $(chroot "$FS" apt-cache search linux-image-\* | \
55 sed 's/\s.*//' | sort -h ) )
56 echo "** Please select kernel **"
57 select KERNEL in "${KERNELS[@]}" ; do [ -n "$KERNEL" ] && break ; done
58 VERSION=${KERNEL#linux-image-}
59 VERSION=${VERSION%-unsigned}
60 chroot "$FS" apt-get install -y $KERNEL
61 chroot "$FS" depmod -a $VERSION
63 chroot "$FS" apt-get install -y busybox-static debootstrap
64 touch "$FS"/usr/bin{linuxrc,init} # block these
65 chroot "$FS" /usr/bin/busybox --install -s /usr/bin
67 fi # End of $DEBSTRAP actions
69 ## Pick boot kernel, if there are many
70 LINUXES=( $(cd "$FS"/boot ; ls vmlinuz* 2>/dev/null) )
71 if [ ${#LINUXES[@]} -gt 1 ] ; then
72 echo "** Please select boot kernel"
73 select LINUX in $LINUXES ; do [ -n "$LINUX" ] && break ; done
74 elif [ -n "$LINUXES" ] ; then
75 LINUX="$FS"/boot/${LINUXES[0]}
77 echo "** Oh No! There is no $FS/boot/vmlinux-* ... bailing out!" >&2
81 #============================================================
82 # Prepare a temporary directory tree with a boot kernel and $FS packed
83 # up into an initrd.gz
85 trap "rm -r $TMP" 0 2 15
87 mkdir -p $TMP/prep/{proc,dev,tmp,sys,mnt,usr}
88 stupid_links $TMP/prep
90 # copy FS tree(s) in full into the TMP/prep tree
94 tar cf - -C "$FS" $D \
95 | tar -xf - --skip-old-files --keep-directory-symlink -C $TMP/prep
99 # Copy FS binary(s) with all its libraries into the TMP/prep tree
103 BIN="$(chroot "$FS" which "$B")"
104 tar cf - --dereference -C "$FS" ${BIN#/} \
105 $(chroot "$FS" ldd "$BIN" | grep -oE '/[^ ]*'|sed 's|/||')\
106 | tar -xf - --keep-directory-symlink -C $TMP/prep
110 INITRD="$FS"/boot/initrd.img${LINUX#*/vmlinuz}
111 if [ -r "$INITRD" ] ; then
112 #select X in my FS ; do [ -n "$X" ] && break ; done
119 copyFStree lib/modules
120 zstdcat $INITRD | ( cd $TMP/prep && cpio -i )
121 VERSION=( $TMP/prep/lib/modules/* )
122 for V in ${VERSION[@]} ; do
123 depmod -a -b $TMP/prep ${V#$TMP/prep/lib/modules/}
127 copyFStree lib/modules lib/udev
128 copyFSbin busybox sh cttyhack setsid mount mkdir
129 copyFSbin udevd udevadm modprobe modinfo kmod blkid
134 mv $TMP/prep/init{,.FS}
135 echo "** Please select /init template"
136 select INIT in none $(echo init*.template) ; do [ -n "$INIT" ] && break ; done
137 if [ "$INIT" != none ] ; then
138 cp $INIT $TMP/prep/init
139 chmod a+x $TMP/prep/init
142 # Populate $TMP with /initrd.gz. /vmlinuz and /menu.cfg
143 ( cd "$TMP/prep" && find -printf '%P\n' | cpio -o -H newc ) | \
144 gzip > $TMP/initrd.gz
145 cp $LINUX $TMP/vmlinuz
148 # Common syslinux menu
149 CON="console=ttyS0,115200"
150 cat <<EOF > $TMP/menu.cfg
152 label rescue (serial)
154 append initrd=/initrd.gz init=/init $CON rescue
157 append initrd=/initrd.gz init=/init rescue
160 append initrd=/initrd.gz root=/dev/sda2 rootfstype=squashfs $CON
163 append initrd=/initrd.gz root=/dev/sdb1 $CON
166 . ./minbase-strap-bios.sh
167 . ./minbase-strap-uefi.sh
168 . ./minbase-strap-mkimg.sh
170 for E in $ENDING ; do $E ; done