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#!/bin/sh
. sami/btrfs-functions.sh
. sami/var.sh
disable_stdout() { exec 3>&1; exec >&2; }
enable_stdout() { exec >&3; }
with_stdout() { enable_stdout; "$@"; disable_stdout; }
create_layer_filesystem()
{
[ ! -e "$layer_file" ] || return
! mountpoint "$mountpoint" || return
mkdir -p "$mountpoint" &&
sex dd if=/dev/zero of="$layer_file" bs=1M count="$layer_size" &&
sex mount -o subvol=/,compress "$seed_file" "$mountpoint" &&
layer_dev=$(losetup -f --show "$layer_file") &&
sex btrfs device add "$layer_dev" "$mountpoint" &&
mount -o rw,remount "$mountpoint"
}
finish()
{
local subv_id
sex mv "$mountpoint"/ROOT "$mountpoint"/ROOT.old || return
sex btrfs subvolume snapshot "$mountpoint"/"$receive_subv" "$mountpoint"/ROOT || return
subv_id=$(btrfs_show_subvolume_id "$mountpoint"/ROOT) || return
sex btrfs subvolume set-default "$subv_id" "$mountpoint" || return
sex btrfs subvolume delete "$mountpoint"/ROOT.old || return
umount "$mountpoint" || return
sex btrfstune -S1 "$layer_file" || return
losetup -d "$layer_dev"
}
set -e
disable_stdout
receive_dest=$1
receive_subv=$2
[ "$receive_subv" ]
[ "$receive_dest" ]
mountpoint=$(realpath -m --relative-base=. "$receive_dest")
seed_file=sami/debian-live-8.4.0-amd64-standard.btrfs
layer_file_FINAL=sami/debian-live-8.4.0-amd64-standard.layer.$receive_subv.btrfs
layer_file=$layer_file_FINAL.part
layer_size=1000
create_layer_filesystem
with_stdout sex btrfs receive "$mountpoint"
finish
mv "$layer_file" "$layer_file_FINAL"
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