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change retention policy so that per window the oldest and the newest snapshot is kept, unless the newer one is not new enough ;)

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erdgeist 2013-05-10 19:12:50 +00:00
parent 84db3c9c8a
commit 721ae5e99d
1 changed files with 16 additions and 5 deletions
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ezjail-admin
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@ -446,7 +446,7 @@ ensure_jailzfs() {
# implement snapshot retentions
filteroldsnapshots() {
local win repeat bottom in_window snap_id snap_del first_round_done max_diff
local win repeat bottom in_window snap_id snap_del snap_first first_round_done max_diff
bottom=`date +%s`
unset snap_del first_round_done
@ -461,12 +461,12 @@ filteroldsnapshots() {
# values default to minutes
case ${win} in *h) m=60;; *d) m=1440;; *w) m=10080;; *y) m=*525600;; *) m=1;; esac
win=$((${win%[mhdwy]}*m*60))
max_diff=$(( 3 * win / 4 ))
# innerloop $repeats over windows
while [ $(( repeat-=1 )) -ge 0 ]; do
# Shift bottom of window
bottom=$(( ${bottom} - ${win} ))
unset snap_first
# now loop over parameters
in_window=YES; while [ "${in_window}" ]; do
@ -482,14 +482,25 @@ filteroldsnapshots() {
[ "${first_round_done}" ] || echo /sbin/zfs snapshot -r ${ezjail_zfs}@ez-autosnap-`date +${ezjail_snap_date_format}`
[ "${first_round_done}" ] || /sbin/zfs snapshot -r ${ezjail_zfs}@ez-autosnap-`date +${ezjail_snap_date_format}`
# we remembered the first snapshot in window
# only keep it, if it is newer than the oldest by more than half the window size
if [ "${snap_first}" -a "${snap_del}" -a $(( snap_del - snap_first )) -lt $(( win / 2 )) ]; then
echo /sbin/zfs destroy -r ${ezjail_zfs}@ez-autosnap-`date -j -f %s ${snap_first} +${ezjail_snap_date_format}`
/sbin/zfs destroy -r ${ezjail_zfs}@ez-autosnap-`date -j -f %s ${snap_first} +${ezjail_snap_date_format}`
fi
# Zero marks end of snaps list
[ "${snap_id}" -eq 0 ] && return
unset snap_del in_window
else
if [ "${snap_del}" -a $(( snap_del - snap_id )) -lt ${max_diff} ]; then
echo /sbin/zfs destroy -r ${ezjail_zfs}@ez-autosnap-`date -j -f %s ${snap_del} +${ezjail_snap_date_format}`
/sbin/zfs destroy -r ${ezjail_zfs}@ez-autosnap-`date -j -f %s ${snap_del} +${ezjail_snap_date_format}`
if [ "${snap_del}" ]; then
if [ "${snap_first}" ]; then
echo /sbin/zfs destroy -r ${ezjail_zfs}@ez-autosnap-`date -j -f %s ${snap_del} +${ezjail_snap_date_format}`
/sbin/zfs destroy -r ${ezjail_zfs}@ez-autosnap-`date -j -f %s ${snap_del} +${ezjail_snap_date_format}`
else
snap_first="${snap_del}"
fi
fi
snap_del="${snap_id}"
snap_id=0