env/bin/rbucmd.sh

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2021-06-25 17:35:13 +02:00
#!/bin/sh
# env
# Written in 2021 by Lucas
# CC0 1.0 Universal/Public domain - No rights reserved
#
# To the extent possible under law, the author(s) have dedicated all
# copyright and related and neighboring rights to this software to the
# public domain worldwide. This software is distributed without any
# warranty. You should have received a copy of the CC0 Public Domain
# Dedication along with this software. If not, see
# <http://creativecommons.org/publicdomain/zero/1.0/>.
usage()
{
printf "Usage: %s [-c] [-l login_name] host backup-name\n" \
"${0##*/}" >&2
exit 1
}
err()
{
printf "%s: %s\n" "${0##*/}" "$*" >&2
exit 1
}
login_name=$(id -nu)
agent_mode=yes
while getopts cl: flag; do
case $flag in
c) agent_mode=confirm ;;
l) login_name=$OPTARG ;;
*) usage
esac
done
shift $((OPTIND - 1))
if [ $# -ne 2 ] || [ -z "$1" ] || [ -z "$2" ]; then
usage
fi
host=$1
backup_name=$2
[ -f "$host/bulist" ] || err "no bulist present in \"$h/\""
eval $(ssh-agent -s)
trap 'eval $(ssh-agent -ks)' EXIT INT QUIT TERM
set -e
# Load correct key into ssh-agent.
ssh -o AddKeysToAgent=$agent_mode "$login_name@$host" true
cd "$host"
tmpdir=$(ssh "$login_name@$host" mktemp -dt rbucmd.XXXXXX)
sftp "$login_name@$host" <<EOF
put bulist $tmpdir/bulist
EOF
ssh "$login_name@$host" "cat - >\"$tmpdir/bu.sh\"" <<EOF
cd / &&
pkg_info -mz >/tmp/pkg-info.txt &&
doas xargs pax -wzf "$tmpdir/$backup_name.tgz" <"$tmpdir/bulist" &&
doas chown "$login_name:$login_name" "$tmpdir/$backup_name.tgz"
EOF
# -t is needed for doas to read a password.
ssh -t "$login_name@$host" sh "$tmpdir/bu.sh"
sftp -o "user=$login_name" "$host" <<EOF
get $tmpdir/$backup_name.tgz
rm $tmpdir/*
rmdir $tmpdir/
rm /tmp/pkg-info.txt
EOF