View difference between Paste ID: YfZUnytT and Rz49ANTU

 #!/bin/sh
 
-# btrfs-snapshots.sh
+# btrfs-snapshots.sh 1.0
-# Erzeuge hourly, daily, weekly, and monthly Snapshots der btrfs Dateisysteme
+# Create hourly, daily, weekly, and monthly snapshots of btrfs filesystems
 
-# Basiert auf http://article.gmane.org/gmane.comp.file-systems.btrfs/12609
+# See https://copy.com/WI9AXqTH2nD4 or as a "subversion" of http://pastebin.com/Rz49ANTU
 
-# 0 * * * * /usr/local/bin/snapshot hourly 6
+# Based somewhat on http://article.gmane.org/gmane.comp.file-systems.btrfs/12609
-# 0 0 * * * /usr/local/bin/snapshot daily 7
+
-# 0 0 * * 0 /usr/local/bin/snapshot weekly 4
+# 00,15,30,45  * * * *  /usr/local/bin/btrfs-snapshots.sh frequently  4
 # 38           * * * *  /usr/local/bin/btrfs-snapshots.sh hourly     24
 # 08          00 * * *  /usr/local/bin/btrfs-snapshots.sh daily       7
-    echo "Usage: $0 SNAPSHOT_PREFIX NUM_SNAPSHOTS"
+# 08          12 * * 0  /usr/local/bin/btrfs-snapshots.sh weekly      4
 
 if [ "$#" -ne 2 ]; then
     echo "Usage: $0 SNAPSHOT_TAG NUM_SNAPSHOTS
-SNAPSHOT_PREFIX="$1"
+Create hourly, daily, weekly, and monthly snapshots of btrfs filesystems.
 
 Based somewhat on http://article.gmane.org/gmane.comp.file-systems.btrfs/12609
-#a@ewzw032:~$ sudo btrfs subv snaps -r /.backup /.backup/.blub ; sudo btrfs subv snaps -r /.backup/Syno /.backup/Syno/.blub
+Here's my crontab:
 00,15,30,45  * * * *  $0 frequently  4
-snap_prefix=".snapshot:$SNAPSHOT_PREFIX:"
+38           * * * *  $0 hourly     24
-snap_name="$snap_prefix`date +%Y-%m-%d--%H.%M.%S.%N`"
+08          00 * * *  $0 daily       7
 08          12 * * 0  $0 weekly      4"
-# Finde alle btrfs
+
-df -T | grep ' btrfs ' | perl -p -e 's,^(.*?) .* (/.*)$,$1 $2,' | while read dev mp; do
+
-    # Find alle subvolumes dieses btrfs
+
-    # z.B.: ID 268 gen 3176 top level 5 path foo/bar
+# "Tag" to use for snapshots
-    # Zeige alle subvolumes und zusätzliche alle "readonly" (snapshot)
+SNAPSHOT_TAG="$1"
-    # Volumes. Filtere dann das raus, was doppelt angezeigt wurde; das
+# How many of those snapshots to keep
-    # sind die snapshots. Dadurch werden nur die "richtigen" Volumes
+
-    # angezeigt.
+
-    ( btrfs subv list -r "$mp" ; btrfs subv list "$mp" ) | sort | uniq -u | while read id Id gen Gen top level Toplevel path Path; do
+# Helper veriables
-        # Erzeuge den Snapshot
+# A "prefix" for all the snapshots
-        #echo "`date +%Y-%m-%d--%H.%M.%S.%N`: Erzeuge Snapshot $mp/$Path/$snap_name fuer $mp/$Path"
+snap_prefix="snapshot:$SNAPSHOT_TAG:"
-        set -x; btrfs subv snapshot -r "$mp/$Path" "$mp/$Path/$snap_name"; set +x
+# "Now"
 snap_date="`date +%Y-%m-%d--%H.%M.%S.%N`"
 # Name of the script
-    # Lösche alte Snapshot(s)
+script_name=`basename "$0"`
-    # Zeige alle read only Subvolumes an. Und zusätzlich "doppelt" die letzten
+
-    # $NUM_SNAPSHOTS Snapshots. Führt dazu, das die gewünchte Anzahl an zu
+# Messages are logged to syslog
-    # behaltenden Snapshots doppelt angezeigt wird.
+# facility: auth, authpriv (for security information of a sensitive nature), cron, daemon, ftp, kern (can't be generated from user process), lpr, mail, news, security (deprecated synonym for auth), syslog, user, uucp, and local0 to local7
-    # Nun sortiere die Liste und zeige nur die an, die nur 1x vorkommen.
+log_fac="local5"
-    # Das sind die Snapshots, die gelöscht werden sollen.
+# tag
-    # ID 257 gen 28590 top level 256 path a
+log_tag="$script_name"
-    # a@ewzw032:~$ ( sudo btrfs subv list -r /.backup/ | grep ' \.boing:' | tail -$n ; sudo btrfs subv list -r /.backup/ | grep ' \.boing:' ) | sort | uniq -u
+
 # Add path to btrfs-progs dev version to beginning of $PATH
-    ( btrfs subv list -r "$mp" | grep " path $snap_prefix" | tail -"$n"; sudo btrfs subv list -r "$mp" | grep " path $snap_prefix" ) | sort | uniq -u | while read id Id gen Gen top level Toplevel path Path; do
+# Needs a post 2013-02-01 15:55:06 (commit 64edc851da59c47b92ee6830101be0854add7f09)
-        #echo "`date +%Y-%m-%d--%H.%M.%S.%N`: Entferne Snapshot $mp/$Path/$snap_name fuer $mp/$Path"
+# version of btrfs-progs from http://git.kernel.org/cgit/linux/kernel/git/mason/btrfs-progs.git/commit/
-        set -x; btrfs subv delete "$mp/$Path"; set +x
+# because of issues with "btrfs subv list"
 btrfs_progs_dev_path="/home/a/Copy/Computerkram/Programme/btrfs-progs.dev/bin"
 PATH="$btrfs_progs_dev_path:$PATH"
-    echo
+
 # Find all btrfs filesystems
 btrfs fi show 2>/dev/null | awk '/ path / {print $NF}' | while read dev; do
     # Find uuid and label
     set -- `sudo btrfs fi show 2>/dev/null | grep -B2 " path $dev" | grep "Label:" | sed  's,.*: \(.*\)  uuid: \(.*\),\1 \2,'`
     label="$1"
     uuid="$2"
     logger -t "$log_tag" -p "$log_fac.info" -- "Processing filesystem with label $label and uuid $uuid on $dev"
     # Change the "dev" name ("path") so, that it is usable; ie. / -> .
     safe_dev=`echo "$dev" | tr / .`
     # Create a directory for the temporary mountpoint
     tmp_mount_dir=`mktemp -d "/tmp/.btrfs.mount.$uuid.$safe_dev.XXXXXX"`
     # Mount the current btrfs there
     if ! mount -t btrfs "$dev" "$tmp_mount_dir"; then
         logger -t "$log_tag" -p "$log_fac.err" -- "Error! Could not do: mount -t btrfs $dev $tmp_mount_dir"
         exit 1
     fi
 
     # Create snapshots for the "root" volume
     if ! btrfs subv snaps -r "$tmp_mount_dir" "$tmp_mount_dir/,$snap_prefix$snap_date" > /dev/null; then
         logger -t "$log_tag" -p "$log_fac.err" -- "Error! Could not do: btrfs subv snaps -r $tmp_mount_dir $tmp_mount_dir/,$snap_prefix$snap_date"
         exit 1
     else
         logger -t "$log_tag" -p "$log_fac.info" -- "Created snapshot $Path,$snap_prefix$snap_date for root volume of fs with uuid $uuid"
     fi
     # Find old, no longer wanted snapshots with the "tag" of this subvolume
     # - list all (read only + writable) snapshots of this filesystem
     # - list only those for current "path" (-> subvolume) and prefix
     # - list only the last $NUM_SNAPSHOTS snapshots -> those are to "survive"
     # - again list all snapshots of current path
     # - sort and list only only those, which are shown just once
     # - -> a list of those snapshots, which are to go
     (btrfs subv list -r "$tmp_mount_dir" | grep " path ,$snap_prefix" | tail -"$NUM_SNAPSHOTS"; btrfs subv list -r "$tmp_mount_dir" | grep " path ,$snap_prefix") | sort | uniq -u | while read __id IdDel __gen GenDel __top __level ToplevelDel __path PathDel; do
         # Delete the snapshot
         if ! btrfs subv del "$tmp_mount_dir/$PathDel" > /dev/null; then
             logger -t "$log_tag" -p "$log_fac.err" -- "Error! Could not do: btrfs subv del $tmp_mount_dir/$PathDel"
             exit 1
         else
             logger -t "$log_tag" -p "$log_fac.info" -- "Removed snapshot $PathDel"
         fi
     done
 
     # List all non read-only (ie. writable) subvolumes
     # - create a list of ALL subvolumes (read only + writable)
     # - create a list of writable subvolumes
     # - sort those two lists
     # - list only those, which are show just once; ie. the read only subvolumes
     (btrfs subv list -ar $tmp_mount_dir; btrfs subv list -a $tmp_mount_dir) | sort | uniq -u | while read _id Id _gen Gen _top _level Toplevel _path Path; do
         # Create the snapshot
         if ! btrfs subv snaps -r "$tmp_mount_dir/$Path" "$tmp_mount_dir/$Path,$snap_prefix$snap_date" > /dev/null; then
             logger -t "$log_tag" -p "$log_fac.err" -- "Error! Could not do: btrfs subv snaps -r $tmp_mount_dir/$Path $tmp_mount_dir/$Path,$snap_prefix$snap_date"
             exit 1
         else
             logger -t "$log_tag" -p "$log_fac.info" -- "Created snapshot $Path,$snap_prefix$snap_date for subvolume $Path"
         fi
         # Find old, no longer wanted snapshots with the "tag" of this subvolume
         # - list all (read only + writable) snapshots of this filesystem
         # - list only those for current "path" (-> subvolume) and prefix
         # - list only the last $NUM_SNAPSHOTS snapshots -> those are to "survive"
         # - again list all snapshots of current path
         # - sort and list only only those, which are shown just once
         # - -> a list of those snapshots, which are to go
         (btrfs subv list -r "$tmp_mount_dir" | grep " path $Path,$snap_prefix" | tail -"$NUM_SNAPSHOTS"; btrfs subv list -r "$tmp_mount_dir" | grep " path $Path,$snap_prefix") | sort | uniq -u | while read __id IdDel __gen GenDel __top __level ToplevelDel __path PathDel; do
             # Delete the snapshot
             if ! btrfs subv del "$tmp_mount_dir/$PathDel" > /dev/null; then
                 logger -t "$log_tag" -p "$log_fac.err" -- "Error! Could not do: btrfs subv del $tmp_mount_dir/$PathDel"
                 exit 1
             else
                 logger -t "$log_tag" -p "$log_fac.info" -- "Removed snapshot $PathDel"
             fi
         done
     done
     # Unmount the filesystem
     if ! umount "$tmp_mount_dir"; then
         logger -t "$log_tag" -p "$log_fac.err" -- "Error! Could not do: umount$tmp_mount_dir"
         # Not fatal
         # exit 1
     fi
     # Remove the directory where the filesystem was mounted
     if ! rmdir "$tmp_mount_dir"; then
         logger -t "$log_tag" -p "$log_fac.err" -- "Error! Could not do: rmdir $tmp_mount_dir"
         # Not fatal
         # exit 1
     fi
 done
 
 # Done ☺
 exit 0
 # EOF