blob: 31b44876842f5af2986c9bc5aa75a8eed0b0cbe9 (
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|
#!/bin/bash
[ -r "#ETCDIR#/backup.conf" ] && \
. "#ETCDIR#/backup.conf"
usage()
{
>&2 echo \
'Usage: forwarddown key-id date backup-id1 backup-id2 ...
Write encrypted, compressed tar from backed up files not newer than date to stdout.
Options:
key-id key id of key to encrypt to
date backup should not be newer than the given date
backup-id[n] backups to restore
#HELPTEXT# #'
[ -z "$1" ] && exit 1
exit $1
}
if [ $# -eq 1 ]; then
if [ "$1" == "--help" ]; then
usage 0
elif [ "$1" == "--version" ]; then
echo '#VERSION#'
exit
fi
fi
if [ $# -lt 3 ]; then
usage
fi
key_id=$(
printf '%s\n' "$1" \
| tr '[:lower:]' '[:upper:]'
)
shift
if ! gpg --list-keys --with-colon "${key_id}" \
| grep -qxF 'fpr:::::::::'"${key_id}"':'; then
>&2 printf 'Cannot find gpg key with fingerprint "%s"\n' "${key_id}"
usage
fi
if ! date=$(date -u '+%Y_%m_%d' -d"${1}"); then
>&2 printf 'Cannot parse date "%s"\n' "${1}"
usage
fi
shift
forwarddown_dirs=()
for backup_id in "$@"; do
if [ -z "${backups[${backup_id}]}" ]; then
>&2 printf 'backup id "%s" is unknown\n' "${backup_id}"
usage
fi
forwarddown_dirs+=("${backups[${backup_id}]## *}")
done
date=$(
{
find "${forwarddown_dirs[@]%% *}" -mindepth 1 -maxdepth 1 -type d -printf '0 %f\n'
printf '1 %s\n' "${date}"
} \
| sort -k2,2 -k1,1 \
| sed '
s/^0 //
t
/^1 / q
' \
| uniq -c \
| sed '
s/^\s*'"${#forwarddown_dirs[@]}"'\s\+//
t
d
' \
| tail -n1
)
transforms=(
$(
for backup_id in "$@"; do
printf -- '--transform=s@^%s/%s/@%s/%s/@\n' \
"${backups[${backup_id}]%% *}" \
"${date}" \
"${date}" \
"${backup_id}"
done
)
)
directories=(
$(
for backup_id in "$@"; do
printf '%s/%s/\n' \
"${backups[${backup_id}]%% *}" \
"${date}"
done
)
)
tar \
-c \
-f - \
--absolute-names \
"${transforms[@]}" \
"${directories[@]}" \
| pigz --best -c - \
| gpg -e -r "${key_id}" -o - -
|
