137 lines
3.4 KiB
Bash
Executable File
137 lines
3.4 KiB
Bash
Executable File
#!/bin/bash
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# ----------------------------------------------------------------------
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# mikes handy rotating-filesystem-snapshot utility
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# ----------------------------------------------------------------------
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# this needs to be a lot more general, but the basic idea is it makes
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# rotating backup-snapshots of /home whenever called
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# ----------------------------------------------------------------------
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#unset PATH # suggestion from H. Milz: avoid accidental use of $PATH
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# ------------- system commands used by this script --------------------
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###BEGIN: generic tool checker
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# FIXME: To reuse this function, be sure to edit this line (space separated
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# list).
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needed_tools="id echo mount rm mv cp touch rsync"
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#
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# One shall not need edit anything below this line
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###
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checktools() {
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# This functions attempts to be generic enough to be reused in any program
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# that needs to check that specific tools are present on the system
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# and can be found in the PATH
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var=$(echo $1 | tr '[:lower:]' '[:upper:]')
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echo -n "# Looking for $1... "
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local_var="$(which $1)"
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eval $var="$local_var"
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if [ -z "$local_var" ]
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then
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echo 'NOT FOUND!'
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NOTFOUND="$NOTFOUND$1 "
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DIE=1
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else
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echo "$local_var"
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FOUND="$FOUND$1 "
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fi
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unset local_var
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}
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for tool in $needed_tools
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do
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checktools "$tool"
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done
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echo
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echo "# Found $FOUND"
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echo
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if [ -n "$DIE" ]
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then
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echo "Some tools were not found, please check your installation" >&2
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echo "Needed tools: $needed_tools" >&2
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echo -n "Not found:" >&2
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for tool in $NOTFOUND
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do
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echo -n " $tool" >&2
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done
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echo '!' >&2
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exit 127
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fi
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###END: generic tool checker
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source /etc/remote-backup.conf
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# ------------- the script itself --------------------------------------
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# make sure we're running as root
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if [ ! $UID -eq 0 ]
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then
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$ECHO "Sorry, must be root. Exiting..."
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exit
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fi
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if [[ "$REMOUNT" == "true" ]]
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then
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# attempt to remount the RW mount point as RW; else abort
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$MOUNT -o remount,rw $MOUNT_DEVICE $SNAPSHOT_RW ;
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if (( $? ))
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then
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$ECHO "snapshot: could not remount $SNAPSHOT_RW readwrite"
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exit
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fi
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fi
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# rotating snapshots of /home (fixme: this should be more general)
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# step 1: delete the oldest snapshot, if it exists:
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if [ -d $SNAPSHOT_RW/home/hourly.3 ]
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then
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$RM -rf $SNAPSHOT_RW/home/hourly.3
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fi
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# step 2: shift the middle snapshots(s) back by one, if they exist
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if [ -d $SNAPSHOT_RW/home/hourly.2 ]
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then
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$MV $SNAPSHOT_RW/home/hourly.2 $SNAPSHOT_RW/home/hourly.3
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fi
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if [ -d $SNAPSHOT_RW/home/hourly.1 ]
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then
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$MV $SNAPSHOT_RW/home/hourly.1 $SNAPSHOT_RW/home/hourly.2
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fi
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# step 3: make a hard-link-only (except for dirs) copy of the latest snapshot,
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# if that exists
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if [ -d $SNAPSHOT_RW/home/hourly.0 ]
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then
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$CP -al $SNAPSHOT_RW/home/hourly.0 $SNAPSHOT_RW/home/hourly.1
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fi
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# step 4: rsync from the system into the latest snapshot (notice that
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# rsync behaves like cp --remove-destination by default, so the destination
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# is unlinked first. If it were not so, this would copy over the other
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# snapshot(s) too!
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$RSYNC \
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-va \
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--delete \
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--delete-excluded \
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--exclude-from="$EXCLUDES" \
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/home/ \
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$SNAPSHOT_RW/home/hourly.0
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# step 5: update the mtime of hourly.0 to reflect the snapshot time
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$TOUCH $SNAPSHOT_RW/home/hourly.0
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# and thats it for home.
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# now remount the RW snapshot mountpoint as readonly
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if [[ "$REMOUNT" == "true" ]]
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then
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$MOUNT -o remount,ro $MOUNT_DEVICE $SNAPSHOT_RW
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if (( $? ))
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then
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$ECHO "snapshot: could not remount $SNAPSHOT_RW readonly"
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exit
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fi
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fi
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