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make re-sync more efficient

This commit is contained in:
nacho 2018-03-15 11:17:23 +01:00
parent 54473236fc
commit fc7fb84adb
1 changed files with 20 additions and 10 deletions
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btrfs-sync
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@ -161,9 +161,9 @@ get_dst_snapshots() {
## sync incrementally
sync_snapshot() {
local SRC="$1"
local PATH_ DATE SECS SEED SEED_PATH SEED_ARG
local LIST="$( btrfs subvolume list -su "$SRC" )"
local PATH_ DATE SECS SEED SEED_PATH SEED_ARG PATH_RXID DATE_RXID SHOWP RXIDP DATEP
local SHOW="$( btrfs subvolume show "$SRC" )"
local LIST="$( btrfs subvolume list -su "$SRC" )"
# detect existing
SRC_UUID="$( grep 'UUID:' <<<"$SHOW" | head -1 | awk '{ print $2 }' )"
@ -176,22 +176,32 @@ sync_snapshot() {
done
# try to get most recent src snapshot that exists in dst to use as a seed
local HAVE_RXID=0
declare -A PATH_RXID DATE_RXID
local PATHS=( $( btrfs su list -u "$SRC" | awk '{ print $11 }' ) )
SEED=$(
for id in "${DST_UUIDS[@]}"; do
# try to match by UUID
PATH_=$( awk "{ if ( \$14 == \"$id\" ) print \$16 }" <<<"$LIST" )
DATE=$( awk "{ if ( \$14 == \"$id\" ) print \$11, \$12 }" <<<"$LIST" )
# try to match by received UUID
# try to match by received UUID, only if necessary
[[ "$PATH_" == "" ]] && {
local PATHS=( $( btrfs su list -u "$SRC" | awk '{ print $11 }' ) )
for path in "${PATHS[@]}"; do
local SHOWP="$( btrfs su sh "$( dirname "$SRC" )/$( basename "$path" )" 2>/dev/null )"
local RXIDP="$( grep 'Received UUID' <<<"$SHOWP" | awk '{ print $3 }' )"
local DATEP="$( grep 'Creation time' <<<"$SHOWP" | awk '{ print $3, $4 }' )"
[[ "$id" == "$RXIDP" ]] && { PATH_="$path" DATE="$DATEP"; }
done
[[ "$HAVE_RXID" == "0" ]] && {
for p in "${PATHS[@]}"; do
SHOWP="$( btrfs su sh "$( dirname "$SRC" )/$( basename "$p" )" 2>/dev/null )"
RXIDP="$( grep 'Received UUID' <<<"$SHOWP" | awk '{ print $3 }' )"
DATEP="$( grep 'Creation time' <<<"$SHOWP" | awk '{ print $3, $4 }' )"
[[ "$RXIDP" == "" ]] && continue
PATH_RXID["$RXIDP"]="$p"
DATE_RXID["$RXIDP"]="$DATEP"
done
HAVE_RXID=1
}
PATH_="${PATH_RXID["$id"]}"
DATE="${DATE_RXID["$id"]}"
}
[[ "$PATH_" == "" ]] || [[ "$PATH_" == "$( basename "$SRC" )" ]] && continue
SECS=$( date -d "$DATE" +"%s" )