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#!/bin/sh
die()
{
printf '%s\n' "$*" >&2
exit 1
}
btrfs_subdevices()
{
local mountpoint="$1"
btrfs filesystem show "$mountpoint" | sed -ne 's/^[ \t]*devid.* path //p'
}
btrfs_subdevice_count()
{
btrfs_subdevices "$1" | wc -l
}
remove()
{
for dev; do
(set -x; btrfs device remove "$dev" /)
dmsetup remove "$dev" 2>/dev/null
losetup -D
done
}
dm_name()
{
dmsetup info "$1" | sed -ne 's/^Name: *//p'
}
md_ready()
{
local mountpoint="$1" count dev
count=$(mdadm_subdevices /dev/md55|wc -l)
[ "$count" = 1 ] || return
dev=$(mdadm_subdevices /dev/md55)
[ "$(dm_name "$dev")" = samizdatiso ]
}
copy()
{
temp_target=$(mktemp --tmpdir=/outerfs)
mdadm_copy_eject_crypt /dev/md55 "$temp_target"
}
. mdadm-dup.sh || exit 1
target=$1
if [ ! "$target" ] && mountpoint -q /srv && [ ! -e /srv/samizdat.iso ]; then
target=/srv/samizdat.iso
fi
[ "$target" ] || die "Usage: $0 <target filename>"
[ ! -e "$target" ] || die "Error: file exists: $target"
if ! mountpoint -q /outerfs; then
die "Error: /outerfs is not a mountpoint. Please mount a safe filesystem to temporarily store the ISO on /outerfs"
fi
devices=$(btrfs_subdevices /) || exit 1
set --
seen=
for dev in $devices; do
[ -b "$dev" ] || exit 1
case "$dev" in
/dev/mapper/loop*) set -- "$@" "$dev" ;;
/dev/mapper/samizdatcrypt) seen=y ;;
esac
done
[ "$seen" ] || set -- # avoid messing up someone's btrfs!
if ! md_ready; then
copy &
fi
remove "$@"
echo 'Waiting while boot medium is freed...' >&2
wait
notified=
while true; do
if [ "$(btrfs_subdevice_count /)" = 1 ] && md_ready; then
if [ -z "$notified" ]; then
echo 'Boot medium is free. It may be ejected now.' >&2
notified=y
fi
mdadm_copy_eject /dev/md55 "$target".part &&
mv "$target".part "$target"
exit
fi
sleep 5
done
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