80 lines
1.9 KiB
Bash
Executable file
80 lines
1.9 KiB
Bash
Executable file
#!/bin/bash
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source /etc/profile >/dev/null
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[ -f "$HOME/.zb-rc" ] && source "$HOME/.zb-rc"
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if [[ -z "$1" || -z "$2" || -z "$3" ]] ; then
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echo "usage: $0 <remote> <remote_zfs_object> <local_zfs_object>" >&2
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echo "<remote> is either ssh-style user@hostname, or - for local operation" >&2
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exit 1
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fi
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timestamp () {
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t="`echo \"$1\" |sed -ne 's/^.*@zb-//p' |tr 'p_' '+ '`"
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[[ -z "$t" ]] && return 1
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date --date="$t" +%s
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return $?
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}
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if [ "$1" = "-" ]
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then remote_cmd="sh -c"
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else remote_cmd="ssh $1"
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fi
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remote_zfs="$2"
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local_zfs="$3"
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# find newest available and newest common snapshot
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newest="N/A"
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newest_common="N/A"
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while read l ; do
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fullname=${l#* }
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snapname=${fullname#*@zb-}
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newest="$snapname"
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if zfs list -t snapshot -H "${local_zfs}@zb-${snapname}" ; then
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newest_common="$snapname"
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fi >/dev/null 2>/dev/null
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done < <(
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$remote_cmd "zfs list -t snapshot -r -d 1 -H \"${remote_zfs}\" " | awk '{print $1;}' | while read l ; do
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#link unix timestamps
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unixtime=`timestamp "$l"` || continue
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echo "$unixtime" "$l"
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done | sort -n )
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# some checks
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if [ "$newest" = "N/A" ] ; then
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echo "$0: no remote snapshots available to pull" >&2
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exit 2
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fi
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if [ "$newest" = "$newest_common" ] ; then
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echo "$0: nothing new to pull" >&2
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exit 0
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fi
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ret=0
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if [ "$newest_common" = "N/A" ] ; then
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#do a full send
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$remote_cmd "zfs send -R \"${remote_zfs}@zb-${newest}\"" | zfs recv -F "${local_zfs}"
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ret=$?
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else
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#do incremental send
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$remote_cmd "zfs send -R -I \"${remote_zfs}@zb-${newest_common}\" \"${remote_zfs}@zb-${newest}\"" | zfs recv -F "${local_zfs}"
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ret=$?
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fi
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[ "$ret" != 0 ] && echo "pulling to ${local_zfs} failed" >&2
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#in some cases and on some setups (Sun_SSH) when `zfs recv` fails, ssh ignores
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#the SIGPIPE and the connection hangs there forever, somehow. This fixes the
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#issue by killing all children that were possibly spawned by this shell.
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[ "$ZB_WORKAROUND_SSH_SIGPIPE" = "yes" ] && pkill -P $$
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exit $ret
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