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|
#!/bin/bash
set -e -o pipefail
confdir=/etc/btrfs
blacklist=$confdir/blacklist.txt
with_subvolumes()
{
btrfs subvolume list / -a |
while read _ id _ gen _ _ toplevel _ path
do
"$@"
done
}
fixup_path()
{
if ! [ "$root" ]
then
case "$path" in
'<FS_TREE>'/* ) root=${path#*/} ;;
* ) exit 1 ;;
esac
fi
case "$path" in
'<FS_TREE>'/"$root"/* ) path_fixed=${path#*/$root} ;;
"$root"/* ) path_fixed=${path#$root} ;;
* ) return ;;
esac
compute_paths
"$@"
}
is_our_snapshot()
{
case "$1" in
*/.snapshot~* ) true ;;
*) false ;;
esac
}
filter_blacklist()
{
if is_our_snapshot "$path_fixed"
then
if [ -e "$conf_name" ]
then
printf '%20s %s\n' delete "$conf_name" >&2
printf '%20s %s\n' '(snapshot) lose' "$path_fixed" >&2
fi
return
# Re-reading the blacklist file once per snapshot is not ideal,
# but is fine.
elif [ "$blacklist" -a -f "$blacklist" ]
then
while read pattern
do
if [[ $path_fixed == $pattern ]]
then
if [ -e "$conf_name" ]
then
printf '%20s %s\n' delete "$conf_name" >&2
fi
printf '%20s %s\n' '(blacklist) lose' "$path_fixed" >&2
return
fi
done < "$blacklist"
fi
"$@"
}
compute_paths()
{
source=$path_fixed
source_escaped=$(systemd-escape "$source")
conf_dir=/etc/btrfs/remotes
conf_name="$conf_dir"/$destination_host$source_escaped.json
}
mirror()
{
if [ -e "$conf_name" ]
then
return
fi
set -- \
jq -c -n '{source: $source, destination: $destination}' \
--arg destination "$destination$source_escaped" \
--arg source "$source"
if [ ! "$NO_ACT" ]
then
conf_temp=$conf_name~$(date -Ins)
{
"$@" > "$conf_temp"
mv -T -- "$conf_temp" "$conf_name"
printf '%20s %s\n' 'add' "$path_fixed" >&2
} || {
rm -- "$conf_temp"
false
}
fi
if [ "$ONLY_ONCE" ]
then
exit 0
fi
}
usage()
{
cat <<END
usage: $0 [-n] [-r]
END
}
case "$0" in
./* ) PATH=${0%/*}:$PATH ;;
esac
case "$(id -u)" in
0 ) ;;
* ) exec sudo --preserve-env=VERBOSE "$0" "$@" || exit ;;
esac
while [ $# -gt 0 ]
do
case "$1" in
-- ) shift
break ;;
-n ) NO_ACT=y ;;
-r ) export RESUME=y ;;
-v ) VERBOSE=y ;;
--once ) ONLY_ONCE=y ;;
--destination ) DESTINATION=$2
shift ;;
-* ) usage
exit 1 ;;
* ) break ;;
esac
shift
done
destination_file=/etc/btrfs/destination.txt
[ "$DESTINATION" ] || read DESTINATION < "$destination_file"
destination_host=${DESTINATION%%:*}
destination_basename=$(hostname) && [ "$destination_basename" ] || destination_basename=btrfs
case "$DESTINATION" in
*/ ) destination=$DESTINATION$destination_basename ;;
[a-zA-Z]* ) destination=$DESTINATION ;;
* ) exit 1 ;;
esac
ssh root@"$destination_host" true || read -p 'Could not log in. Continue? '
with_subvolumes fixup_path filter_blacklist mirror
|
