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#! /usr/bin/env bash
# Upload new or upgrade existing machine subvolume on a Build OS build host.
#
# -k - keep the old subvolume on the build host
#
# <host> - build host to upload to (as user 'build')
# <new-subvol> - machine subvolume to upload
# <old-subvol> - previous machine subvolume (btrfs send -p)
#
usage="usage: $0 [<options>] <host> <new-subvol> [<old-subvol>]"
machines=/build/machines/default
owd="$(pwd)"
trap "{ cd '$owd'; exit 1; }" ERR
set -o errtrace # Trap in functions.
function info () { echo "$*" 1>&2; }
function error () { info "$*"; exit 1; }
keep=false
while [ "$#" -gt 0 ]; do
case "$1" in
-k)
keep=true
shift
;;
-*)
error "unknown option: $1"
;;
*)
break
;;
esac
done
host="$1"
newsv="${2%/}"
oldsv="${3%/}"
if [ -z "$host" -o -z "$newsv" ]; then
error "$usage"
fi
host="build@$host"
newsv_name="$(sed -n -re 's%^(.*/)?([^/]+)$%\2%p' <<<"$newsv")"
oldsv_name="$(sed -n -re 's%^(.*/)?([^/]+)$%\2%p' <<<"$oldsv")"
if [ -z "$newsv_name" ]; then
error "unable to extract subvolume name from '$newsv'"
fi
if [ -n "$oldsv" -a -z "$oldsv_name" ]; then
error "unable to extract subvolume name from '$oldsv'"
fi
# Get the machine link (<name>-<P>) and name.
#
mlink="$(sed -n -re 's/^(.+-[0-9]+)\.[0-9]+$/\1/p' <<<"$newsv_name")"
mname="$(sed -n -re 's/^(.+)-[0-9]+$/\1/p' <<<"$mlink")"
if [ -z "$mlink" -o -z "$mname" ]; then
error "unable to extract machine link/name from '$newsv'"
fi
# Subvolume paths on build host.
#
newsv_host="$machines/$mname/$newsv_name"
oldsv_host="$machines/$mname/$oldsv_name"
# Make sure subvolumes are read-only.
#
function check_ro () # <subvol>
{
local r;
r="$(btrfs property get -ts "$1" ro)"
if [ "$r" != "ro=true" ]; then
info "subvolume '$1' is not read-only"
info "to change, run: btrfs property set -ts $1 ro true"
exit 1
fi
}
check_ro "$newsv"
if [ -n "$oldsv" ]; then
check_ro "$oldsv"
fi
# btrfs send command
#
send=(sudo btrfs send)
if [ -n "$oldsv" ]; then
send+=(-p "$oldsv")
fi
send+=("$newsv")
set -x
# Make sure the machine directory exists.
#
ssh "$host" mkdir -p "$machines/$mname"
# Send the snapshot over.
#
sudo "${send[@]}" | ssh "$host" sudo btrfs receive "$machines/$mname/"
# Adjust machine ownership.
#
ssh "$host" sudo btrfs property set -ts "$newsv_host" ro false
ssh "$host" sudo chown build:build "$newsv_host"
ssh "$host" sudo chown build:build "$newsv_host/*"
ssh "$host" btrfs property set -ts "$newsv_host" ro true
# Atomically switch the current machine.
#
ssh "$host" "cd $machines/$mname && ln -s $newsv_name new-$mlink"
ssh "$host" "cd $machines/$mname && mv -T new-$mlink $mlink"
# Remove the old machine subvolume.
#
{ set +x; } 2>/dev/null
if [ -z "$oldsv" -o "$keep" = true ]; then
exit 0
fi
set -x
ssh "$host" btrfs property set -ts "$oldsv_host" ro false
ssh "$host" btrfs subvolume delete "$oldsv_host"
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