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|
#!/bin/bash
rsyncOptions='-vxcaHAXF'
rsync --help | \
grep -q -- --may-modify-others && \
rsyncOptions="${rsyncOptions} --may-modify-others"
[ -r "#ETCDIR#/backup.conf" ] && \
. "#ETCDIR#/backup.conf"
usage()
{
>&2 echo \
'Usage: backup /tmp/pidFile /path/to/destination/ user@source:path [proxy_user@ssh_host]
Backup files from remote with rsync, possibly via SSH-tunnel.
With no arguments, information is expected to be in array $backups in #ETCDIR#/backup.conf with name of executable (e.g. a symlink) as key.
With one argument, information is expected to be in array ${backups[$1]} in #ETCDIR#/backup.conf.
Options:
/tmp/pidFile location of file to store PID in
/path/to/destination location to store backups in
user@source:path remote data to back up
proxy_user@ssh_host ssh login to proxy node (optional)
#HELPTEXT# #'
[ -z "$1" ] && exit 1
exit $1
}
extract_ssh_host() {
{
printf '%s\n' "$1"
if [ -f ~/.ssh/config ]; then
sed '
/^Host\s\+'"$1"'$/,/^Host\s/ {
s/^\s*Hostname\s\+//
t
}
d
' ~/.ssh/config
fi
} \
| tail -n1
}
extract_ssh_ip_protocols() {
getent ahosts "$(extract_ssh_host "$1")" \
| sed '
s/^\([0-9]\+\.\)\{3\}[0-9]\+\s\+STREAM\(\s.*\)\?$/4/
t
s/^[0-9a-f][0-9a-f:]\+\s\+STREAM\(\s.*\)\?$/6/
t
d
' \
| sort -u \
| if [ -f ~/.ssh/config ]; then
grep -vxF "$(
sed '
/^Host\s\+'"$1"'$/,/^Host\s/ {
s/^\s*AddressFamily\s\+inet\s*$/6/
t
s/^\s*AddressFamily\s\+inet6\s*$/4/
t
}
d
' ~/.ssh/config
)"
else
cat
fi
}
if [ $# -eq 1 ]; then
if [ "$1" == "--help" ]; then
usage 0
elif [ "$1" == "--version" ]; then
echo '#VERSION#'
exit
fi
fi
seldom=false
if [ $# -eq 0 ] || [ $# -eq 1 ]; then
if [ $# -eq 0 ]; then
backupID="$(basename $0)"
else
backupID="$1"
fi
[ -z "${backups[${backupID}]}" ] && usage
set /tmp/${backupID}.pid ${backups[${backupID}]}
if printf '%s\n' "${seldomBackups[@]}" | \
grep -qxF "${backupID}"; then
seldom=true
fi
fi
Basis="$2"
pidFile="$1"
QuellIP=$(echo "$3" | sed "s|^[a-zA-Z]*://||; s|^[a-zA-Z]*@||; s|:\?/.*$||")
if [ "$#" -eq 3 ]; then
Quelle="$3"
ipVer=$(
extract_ssh_ip_protocols "${QuellIP}" \
| sort -n \
| tail -n1
)
elif [ "$#" -eq 4 ]; then
sshHopp="$4"
lokPort=$[$RANDOM/2+8000]
HoppIP="${sshHopp#*@}"
ipVer=$(
{
extract_ssh_ip_protocols "${QuellIP}"
extract_ssh_ip_protocols "${HoppIP}"
} \
| sort -n \
| uniq -d \
| tail -n1
)
if [ ${ipVer} -eq 4 ]; then
localAddress='127.0.0.1'
elif [ ${ipVer} -eq 6 ]; then
localAddress='[::1]'
else
>&2 echo 'ip version of hopp and target must be the same'
exit 1
fi
rsyncShell="-e ssh -${ipVer} -p${lokPort} -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null"
tunnelBefehl="ssh -${ipVer} -t -t -L${localAddress}:${lokPort}:${QuellIP}:22 ${sshHopp}"
Quelle="$(echo "$3" | sed "s|${QuellIP}|${localAddress}|")"
else
usage
fi
rsyncOptions="${rsyncOptions}${ipVer}"
if [ ! -d ${Basis} ]; then
for neededMount in "${neededMounts[@]}"; do
if ! mountpoint -q "${neededMount}"; then
exit 11
fi
done
exit 2
fi
neues_Datum="${Basis}/$(date "+%Y_%m_%d")"
neues="${Basis}/aktuell"
linkdests=""
for s in $(ls -1 "${Basis}" | sort -r | grep -vxF -m 20 aktuell ); do
linkdests="${linkdests} --link-dest ${Basis}/${s}"
done
if [ ! "$(whoami)" == "root" ]; then
echo "I need to be root."
exit 3
fi
[ -w "${Basis}" ] || exit 11
[ -e "${neues_Datum}" ] && exit 4
if ${seldom}; then
for date_diff in $(seq ${seldomness}); do
if [ -e "${Basis}/$(date '+%Y_%m_%d' -d@$(($(date '+%s')-24*60*60*date_diff)))" ]; then
exit 4
fi
done
fi
[ -s "${pidFile}" ] && kill -0 $(cat "${pidFile}") 2>/dev/null && exit 5
echo $$ > "${pidFile}"
if [ -n "${QuellIP}" ]; then
if ! ping -c1 -${ipVer} "$(extract_ssh_host "${QuellIP}")" >/dev/null; then
rm "${pidFile}"
exit 11
fi
fi
if [ -n "${HoppIP}" ]; then
if ! ping -c1 -${ipVer} "$(extract_ssh_host "${HoppIP}")" >/dev/null; then
rm "${pidFile}"
exit 11
fi
fi
if [ -n "${tunnelBefehl}" ]; then
${tunnelBefehl} &
backgroundPid=$!
sleep 4
fi
for toExclude in "${excludes[@]}"; do
excludeArgs="${excludeArgs} --exclude ${toExclude}"
done
if [ ! -e "${neues}/wip" ]; then
mkdir -p "${neues}/wip"
fi
chmod 750 "${neues}"{,/wip}
chown root:root "${neues}"{,/wip}
if [ -z "${rsyncShell}" ]; then
rsync ${rsyncOptions} \
${linkdests} \
${excludeArgs} \
${Quelle} "${neues}/wip/"
sleep 1
rsync ${Quelle}
else
rsync "${rsyncShell}" \
${rsyncOptions} \
${linkdests} \
${excludeArgs} \
${Quelle} "${neues}/wip/"
sleep 1
rsync "${rsyncShell}" ${Quelle}
fi
erg=$?
[ -n "${backgroundPid}" ] && kill "${backgroundPid}"
if [ ${erg} -eq 0 ] || [ ${erg} -eq 24 ]; then
chmod o-rwx "${neues}/wip"
neueres_Datum="${Basis}/$(date "+%Y_%m_%d")"
if [ ! -e "${neueres_Datum}" ]; then
neues_Datum="${neueres_Datum}"
fi
mv "${neues}/wip" "${neues_Datum}"
rmdir "${neues}"
rm "${pidFile}"
else
rm "${pidFile}"
exit 11
fi
|
