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20f8884858
bashclub-zfs-push-pull/bashclub-zfs
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Update bashclub-zfs
2022-12-25 22:41:55 +01:00

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#!/bin/bash
# backup-zfs: use zfs send/recv to push/pull snapshots - New does not run twice
prog="$(basename "$0")"
usage() {
cat >&2 <<-EOF
usage: $prog [-hvq] [-t tag] [-k keep] [-d dateopts] src dest
use zfs send/recv to push/pull snapshots
src the source fs, specified as [host:]pool/path/to/fs
dest the destination fs parent, specified as [host:]pool/path/to/fs
(the final path component of src will be appended to dest)
-p ssh port
-h help
-v verbose mode
-C SSH Compression
-R ZFS Re-Init
-I Send intermediate Snapshots
-q quiet mode
-t tag tag to use for naming snapshots (default: backup-zfs)
-k keep number of snapshots to keep on src (default: 5)
-d dateopts options for date(1) - used to name the snapshots (default: +%F_%T)
-s store mode - output snaps from local fs to ssh server
-r read mode - read snaps from ssh server to local fs
-g gpg-id gpg recipient key id (store mode only)
EOF
exit $1
}
# log to syslog; if verbose or on a tty, also to stdout
# usage: log msg
log() {
logger -t "$prog" -- "$@"
if ! $quiet && [[ -t 1 ]] || $verbose ; then
echo "$@" >&2
fi
}
# exit with a code & message
# usage: die $exitcode msg
die() {
code="$1"
shift
if [[ $code -ne 0 ]] ; then
verbose=true log "FATAL: $@"
else
log "$@"
fi
exit $code
}
# run zfs(1) command either locally or via ssh
# usage: ZFS "$host" command args...
ZFS() {
host="$1"
shift
if [[ -n $host ]] ; then
log "remote ($host): zfs $@"
ssh $sshcompress -p $port "$host" zfs "$@"
else
log "local: zfs $@"
zfs "$@"
fi
}
(
flock -n 9 || exit 1
###
### defaults
###
tag="$prog"
dateopts="+%F_%T"
keep=5
verbose=false
quiet=false
tossh=false
fromssh=false
port=22
sshcompress=""
reinit=""
intermediate="-i "
###
### parse options
###
while getopts "hvqk:p:t:d:srCIRg:" opt ; do
case $opt in
h) usage 0 ;;
v)
verbose=true
send_opts="-v -w"
recv_opts="-v"
;;
q) quiet=true ;;
k) keep=$OPTARG ;;
p) port=$OPTARG ;;
t) tag=$OPTARG ;;
d) dateopts=$OPTARG ;;
s) tossh=true ;;
r) fromssh=true ;;
C) sshcompress="-C " ;;
R) reinit="-R " ;;
I) intermediate="-I " ;;
g) gpgid="$OPTARG" ;;
*) usage 1 ;;
esac
done
shift $((OPTIND-1))
date="$(date $dateopts)"
$tossh && $fromssh && die 1 "-s and -r are mutually exclusive"
if ! $tossh && [[ -n $gpgid ]] ; then
die 1 "-g can only be used with -s"
fi
###
### parse src & dest host/fs info
###
# fail if there's ever >1 colon
if [[ $1 =~ :.*: || $2 =~ :.*: ]] ; then
die 1 "invalid fsspec: '$1' or '$2'"
fi
# fail if src or dest isn't specified
if [[ -z $1 || -z $2 ]] ; then
usage 1
fi
src="$1"
dest="$2"
###
### ssh mode - output snaps from local fs to ssh or read snaps from ssh to local fs
if $tossh ; then
log "sending from local zfs filesystem to SSH server"
# make sure src exists
if [[ $src =~ : ]] ; then
die 1 "$src must be a local zfs filesystem"
elif [[ $(ZFS "" list -H -o name "$src" 2>/dev/null) != $src ]] ; then
die 1 "$src must be a local zfs filesystem"
fi
# split dest to components
if [[ $dest =~ : ]] ; then
desthost="${dest%:*}"
destpath="${dest#*:}"
else
die 1 "$dest must be ssh host:path"
fi
# get the last src component
srcbase="${src##*/}"
###
### create new snapshot on src
###
snap="${tag}_$date"
cur="$src@$snap"
ZFS "$srchost" snapshot -r "$cur" || die $? "zfs snapshot failed"
###
### get newest snapshot on dest - it must exist on src
###
#last="$(ZFS "$desthost" list -d 1 -t snapshot -H -S creation -o name $destfs/$srcbase | head -n1 | cut -f2 -d@)"
last="$(ssh "$desthost" zfslast)"
###
### send
###
# refuse to send without a valid .last maker
if [[ -z $last ]] ; then
die 1 "ssh path contains no .last file"
# special case: tagged snapshots exist on dest, but src has rotated through all
elif ! ZFS "$srchost" list $src@$last &>/dev/null ; then
die 1 "no incremental path from from $src to $dest"
# normal case: send incremental
else
log "sending $([[ -n $gpgid ]] && echo "encrypted ")incremental snapshot from $src to $dest (${last#${tag}_}..${cur#*@${tag}_})"
#ZFS "$srchost" send $send_opts -R $intermediate "$last" "$cur" | ZFS "$desthost" receive $recv_opts -Fue "$destfs" || die $? "zfs incremental send failed"
if [[ -n $gpgid ]] ; then
ZFS "$srchost" send $send_opts -R $intermediate "$last" "$cur" \
| gpg --trust-model always --encrypt --recipient "$gpgid" \
| ssh "$desthost" zfswrite "${tag}_$date.zfssnap.gpg" \
|| die $? "zfs incremental send failed"
ssh "$desthost" zfslast "$snap"
else
ZFS "$srchost" send $send_opts -R $intermediate "$last" "$cur" \
| ssh "$desthost" zfswrite "${tag}_$date.zfssnap" \
|| die $? "zfs incremental send failed"
ssh "$desthost" zfslast "$snap"
fi
fi
exit
elif $fromssh ; then
log "receving from SSH server to local zfs filesystem"
# make sure dest exists
if [[ $dest =~ : ]] ; then
die 1 "$dest must be a local zfs filesystem"
elif [[ $(ZFS "" list -H -o name "$dest" 2>/dev/null) != $dest ]] ; then
die 1 "$dest must be a local zfs filesystem"
fi
# split src into components
if [[ $src =~ : ]] ; then
srchost="${src%:*}"
srcpath="${src#*:}"
else
die 1 "$src must be ssh host:path"
fi
###
### receive
###
log "receiving incremental snapshot from $src to $dest"
#ZFS "$srchost" send $send_opts -R $intermediate "$last" "$cur" | ZFS "$desthost" receive $recv_opts -Fue "$destfs" || die $? "zfs incremental send failed"
for file in $(ssh "$srchost" zfsfind | sort) ; do
log "receiving $file from $srchost"
if [[ $file =~ \.gpg$ ]] ; then
ssh "$srchost" zfsget "$file" | gpg | ZFS "$desthost" receive $recv_opts -Fue "$dest" \
&& ssh "$srchost" rm "$file"
else
ssh "$srchost" zfsget "$file" | ZFS "$desthost" receive $recv_opts -Fue "$dest" \
&& ssh "$srchost" rm "$file"
fi
done
exit
fi
# discard anything before a colon to get the fs
srcfs="${src#*:}"
destfs="${dest#*:}"
# iff there is a colon, discard everything after it to get the host
[[ $src =~ : ]] && srchost="${src%:*}"
[[ $dest =~ : ]] && desthost="${dest%:*}"
# get the last src component
srcbase="${srcfs##*/}"
# ensure the destination fs exists before proceeding
if [[ $(ZFS "$desthost" list -H -o name "$destfs" 2>/dev/null) != $destfs ]] ; then
die 1 "destination fs '$destfs' doesn't exist"
fi
###
### create new snapshot on src
###
cur="$srcfs@${tag}_$date"
ZFS "$srchost" snapshot -r "$cur" || die $? "zfs snapshot failed"
###
### get newest snapshot on dest - it must exist on src
###
last="$(ZFS "$desthost" list -d 1 -t snapshot -H -S creation -o name $destfs/$srcbase | head -n1 | cut -f2 -d@)"
###
### send & receive
###
# 1st time: send full snapshot
if [[ -z $last ]] ; then
log "sending full recursive snapshot from $src to $dest"
ZFS "$srchost" send $send_opts $reinit "$cur" | ZFS "$desthost" receive $recv_opts -Fue "$destfs" || die $? "zfs full send failed"
# special case: tagged snapshots exist on dest, but src has rotated through all
elif ! ZFS "$srchost" list $srcfs@$last &>/dev/null ; then
die 1 "no incremental path from from $src to $dest"
# normal case: send incremental
else
log "sending incremental snapshot from $src to $dest (${last#${tag}_}..${cur#*@${tag}_})"
ZFS "$srchost" send $send_opts -R $intermediate "$last" "$cur" | ZFS "$desthost" receive $recv_opts -Fue "$destfs" || die $? "zfs incremental send failed"
fi
###
### clean up old snapshots
###
for snap in $(ZFS "$srchost" list -d 1 -t snapshot -H -S creation -o name $srcfs \
| grep -F "@${tag}_" | cut -f2 -d@ | tail -n+$((keep+1)) ) ;
do
ZFS "$srchost" destroy -r $srcfs@$snap
done
) 9>/var/lock/bashclub-zfs.lock
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