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Diffstat (limited to 'setup-bootable.in')
| -rw-r--r-- | setup-bootable.in | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/setup-bootable.in b/setup-bootable.in new file mode 100644 index 0000000..b3f6c25 --- /dev/null +++ b/setup-bootable.in @@ -0,0 +1,164 @@ +#!/bin/sh + +prog=${0##*/} + +cleanup() { + if [ -n "$uninstalls" ]; then + apk del -q syslinux + fi + if [ -n "$umounts" ]; then + umount $umounts + fi +} + +die() { + echo "$@" >&2 + cleanup + exit 1 +} + +# get alpine dev from boot cmdline +get_alpine_dev() { + +} + +usage() { + cat <<__EOF__ +usage: $prog [-hu] SOURCE [DEST] + +Copy the contents of SOURCE to DEST and make DEST bootable. + +SOURCE can be a directory or a ISO image. DEST can be a mounted directory +or a device. If DEST is ommitted it will be autodetected. + +Options: + -d Delete existing files first. Unsafe. + -f Force overwriting of existing syslinux.cfg + -h Show this help + -s Run syslinux and install mbr.bin to make it bootable + -v Verbose mode. Display whats going on. + +__EOF__ + exit 1 +} + +while getopts "ih" opt; do + case "$opt" in + -d) delete_first=1;; + -f) force=1;; + -h) usage;; + -s) syslinux=1;; + -v) verbose=1;; + esac +done + + +src=${1:-/media/cdrom} +dest=${2:-/media/usb} + +srcmnt=${MNT:-/mnt} + +# Find the srcdir, mount loopback if needed +if [ -f "$src"/.alpine-release ]; then + srcdir="$src" + [ -n "$verbose" ] && echo "Using directory $src as source" +else + mount -o loop -t iso9660 "$src" $srcmnt \ + || die "Failed to mount loopback $src" + [ -n "$verbose" ] && echo "Using image $src as source" + umounts="$srcmnt" + srcdir="$srcmnt" + if ! [ -f "$srcdir"/.alpine-release ]; then + echo "Warning! No .alpine-release found on image $src" + [ -z "$force" ] && die "Aborting." + fi +fi + +# find target device +if [ -d "$dest" ]; then + if ! awk '{print $2}' /proc/mounts | grep -q "^$dest\$"; then + mount "$dest" || die "Failed to mount $dest" + umounts="$umounts $dest" + fi + destdir="$dest" + [ -n "$vserbose" ] && echo "Using $destdir as target" +elif [ -b "$dest" ]; then + destdir="/media/${dest##*/}" + mkdir -p "$destdir" + mount "$dest" "$destdir" || die "Failed to mount $dest on $destdir" + [ -n "$vserbose" ] && echo "Using $dest (mounted on $destdir) as target" +fi + +# remove partial upgrades if any. +rm -rf "$destdir"/.new "$destdir"/.old + +# check that we have the space we need +needed_space=$(cd "$srcdir" && du -s -c boot apks syslinux.cfg .alpine-release | awk '$2 == "total" {print $1}') +[ -n "$verbose" ] && echo "Needed space: $needed_space kB" + +available_space=$(df -k "$destdir" | tail -n 1 | awk '{print $4}') +[ -n "$verbose" ] && echo "Available space: $available_space kB" +[ $available_space -lt $needed_space ] && die "Not enough space on $destdir. Aborting." + +# copy the files to .new +echo "Copying new files to $destdir/.new..." +mkdir -p "$destdir"/.new || die "Failed to create $destdir/.new" +for i in boot apks syslinux.cfg .alpine-release; do + [ -n "$verbose" + cp -a "$srcdir"/$i "$destdir"/.new/ +done + +# make sure files are really there before we replace existing +sync + +echo "Replacing existing files..." +mkdir -p "$destdir"/.old || die "Failed to create $destdir/.old" + +# do we want keep existing syslinux.cfg? +tomove="boot apks .alpine-release" +if [ -n "$force" ] || ! [ -e "$destdir"/syslinux.cfg ]; then + tomove="$tomove syslinux.cfg" +fi + +# move current files to .old +for i in $tomove; do + if [ -e "$destdir"/$i ]; then + mv "$destdir"/$i "$destdir"/.old/ || die "Failed to move $destdir/$i to $destdir/.old/" + fi +done + +# move .new to current +for i in $tomove; do + mv "$destdir"/.new/$i "$destdir"/ || die "Failed to move $destdir/.new/ to $destdir" +done + +# cleanup +[ -z "$keep_old" ] && rm -rf "$destdir"/.old "$destdir"/.new +sync + + +# If we only copy then we are done. +if [ -z "$syslinux" ]; then + cleanup + echo "Done." + exit 0 +fi + +echo "Making usb bootable..." +dev=$(awk "\$2 == \"$dest\" {print \$1}" /proc/mounts) +parent=$(basename $(dirname /sys/block/*/$(basename $dev))) +if ! apk info -q -e syslinux; then + apk add -q syslinux || die "Failed to install syslinux" + uninstalls="syslinux" +fi + +syslinux $dev + +if [ -b /dev/$parent ]; then + dd if=/usr/share/syslinux/mbr.bin of=/dev/$parent +else + echo "Warning: Could not find the parent device for $dev" +fi + +cleanup +echo "Done." |