rzerres/dsnap-sync
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See #22.
This commit is contained in:
James Barnett
2017-01-08 18:53:43 -06:00
parent ebdafecef6
commit e34362d30c
1 changed files with 20 additions and 7 deletions
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27
bin/snap-sync
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@@ -64,6 +64,12 @@ fi
# It's important not to change this userdata in the snapshots, since that's how
# we find the previous one.
TMPDIR=$(mktemp -d)
PIPE=$TMPDIR/snap-sync.out
mkfifo $PIPE
systemd-cat -t "snap-sync" < $PIPE &
exec 3>$PIPE
TARGETS="$(findmnt -n -v -t btrfs -o TARGET --list)"
UUIDS="$(findmnt -n -v -t btrfs -o UUID --list)"
@@ -113,13 +119,13 @@ fi
selected_uuid="${UUIDS_ARRAY[$((disk))]}"
selected_mnt="${TARGETS_ARRAY[$((disk))]}"
printf "\nYou selected the disk with UUID %s.\n" "$selected_uuid"
printf "The disk is mounted at %s.\n" "$selected_mnt"
printf "\nYou selected the disk with UUID %s.\n" "$selected_uuid" | tee $PIPE
printf "The disk is mounted at %s.\n" "$selected_mnt" | tee $PIPE
if [[ -f /etc/conf.d/snapper ]]; then
source /etc/conf.d/snapper
else
printf "ERROR: /etc/conf.d/snapper does not exist!\n"
printf "ERROR: /etc/conf.d/snapper does not exist!\n" | tee $PIPE
exit 1
fi
@@ -149,17 +155,18 @@ for x in $selected_configs; do
mybackupdir=$(snapper -c root list -t single | awk -F"|" '/'"$selected_uuid"'/ {print $5}' | awk -F "," '/backupdir/ {print $1}' | awk -F"=" '{print $2}')
BACKUPDIR="$selected_mnt/$mybackupdir"
if [[ ! -d $BACKUPDIR ]]; then
printf "ERROR: %s is not a directory on %s.\n" "$BACKUPDIR" "$selected_uuid"
printf "ERROR: %s is not a directory on %s.\n" "$BACKUPDIR" "$selected_uuid" | tee $PIPE
exit 1
fi
fi
printf "Creating new snapshot for $x...\n" | tee $PIPE
new_number=$(snapper -c "$x" create --print-number -d "snap-sync backup in progress")
new_snapshot=$SUBVOLUME/.snapshots/$new_number/snapshot
new_info=$SUBVOLUME/.snapshots/$new_number/info.xml
sync
backup_location=$BACKUPDIR/$x/$new_number/
printf "Will backup %s to %s\n" "$new_snapshot" "$backup_location/snapshot"
printf "Will backup %s to %s\n" "$new_snapshot" "$backup_location/snapshot" | tee $PIPE
if [[ $noconfirm == "yes" ]]; then
cont_backup="yes"
@@ -178,16 +185,18 @@ for x in $selected_configs; do
if [[ -z "$old_number" ]]; then
printf "Sending first snapshot for %s...\n" "$x" | tee $PIPE
btrfs send "$new_snapshot" | btrfs receive "$backup_location" &>/dev/null
else
printf "Sending incremental snapshot for %s...\n" "$x" | tee $PIPE
# Sends the difference between the new snapshot and old snapshot to the
# backup location. Using the -c flag instead of -p tells it that there
# is an identical subvolume to the old snapshot at the receiving
# location where it can get its data. This helps speed up the transfer.
btrfs send "$new_snapshot" -c "$old_snapshot" | btrfs receive "$backup_location" &>/dev/null
printf "Deleting old snapshot for $x...\n" | tee $PIPE
snapper -c "$x" delete "$old_number"
fi
@@ -196,8 +205,12 @@ for x in $selected_configs; do
userdata="backupdir=$mybackupdir, uuid=$selected_uuid"
# Tag new snapshot as the latest
printf "Tagging new snapshot as latest backup for $x...\n" | tee $PIPE
snapper -v -c "$x" modify -d "$description" -u "$userdata" "$new_number"
printf "Backup complete for configuration %s.\n" "$x" > $PIPE
done
printf "\nDone!\n"
printf "\nDone!\n" | tee $PIPE
exec 3>&-