Initial commit

README.md

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+# bacoid
+
+## Purpose
+Sends incremental backups using syncoid and zfs config variables
+
+## How to use
+ * Set target machine with `zfs set syncoid:target_a=user@backup.com:22 rpool`
+ * Set target pool with `zfs set syncoid:pool_a=bkppool rpool`
+ * Set current machine with `zfs set syncoid:machine=hal rpool`
+
+Due to zfs setting these values recursively, bacoid will then go down the
+pool and send whatever matches using the configured settings. In the last
+example, this means that syncoid will send `rpool` and all of its children
+to `user@backup.com:bkppool/user/hal/rpool`
+
+If you want to certain children to be skipped, you can do the following:
+ * `zfs set syncoid:pool_a='' rpool/skip-me`
+
+## Dependencies
+ * bash

bacoid.sh

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+#!/bin/bash
+
+subvolArray=($(zfs get syncoid:pool_a -H -o name,value  | grep -v '@' | awk '{if($2 != "-" && $2 != "") print $1}'))
+
+COUNT=1
+for subvol in ${subvolArray[@]}; do
+	targetArray[$COUNT]="$(zfs get syncoid:target_a ${subvol} | grep -v 'NAME' | awk '{print $3}')"
+	COUNT=$(( ${COUNT} + 1 ))
+done
+targetArray=($(printf '%s\n' ${targetArray[@]} | awk '!a[$0]++'))
+
+
+for target in ${targetArray[@]}; do
+	[[ ${target} != *@* ]] && continue
+	echo "Testing SSH connection to ${target}"
+	USERHOST="$(sed 's|:.*||' <<< ${target})"
+	HOST="$(sed 's|.*@||' <<< ${USERHOST})"
+	USER="$(sed 's|@.*||' <<< ${USERHOST})"
+	PORT="$(sed 's|.*:||' <<< ${target})"
+	if [[ ! -f "${HOME}/.ssh/bkp_rsa" ]]; then
+		echo "Generating bkp_rsa key"
+		ssh-keygen -N "" -f "${HOME}/.ssh/bkp_rsa"
+	fi
+
+	ssh -i "${HOME}/.ssh/bkp_rsa" \
+       		-p ${PORT} \
+       		-o ControlPath=none \
+       		-o LogLevel=INFO \
+       		-o PreferredAuthentications=publickey \
+       		-o IdentitiesOnly=yes ${USERHOST} exit
+	[[ $? -ne 0 ]] && ssh-copy-id -p ${PORT} -i "${HOME}/.ssh/bkp_rsa" ${USERHOST}
+done
+
+
+for subvol in ${subvolArray[@]}; do
+	TARGET="$(zfs get syncoid:target_a ${subvol} | grep -v NAME | awk '{print $3}')"
+	if [[ ${target} != "-" ]]; then
+		USERHOST="$(sed 's|:.*||' <<< ${TARGET})"
+		HOST="$(sed 's|.*@||' <<< ${USERHOST})"
+		USER="$(sed 's|@.*||' <<< ${USERHOST})"
+		PORT="$(sed 's|.*:||' <<< ${TARGET})"
+		MACHINE="$(zfs get syncoid:machine ${subvol} | grep -v NAME | awk '{print $3}')"
+		[[ ${MACHINE} == '-' ]] && { echo "syncoid:machine not set for ${subvol}"; continue; }
+		POOL="$(zfs get syncoid:pool_a ${subvol} | grep -v NAME | awk '{print $3}')"
+		[[ ${POOL} == '-' ]] && { echo "syncoid:pool_a not set for ${subvol}"; continue; }
+		echo "Sending ${subvol} to ${USERHOST}:${POOL}/$USER/$MACHINE/$subvol"
+		syncoid --sendoptions="w" --recvoptions="u"  --sshport=${PORT} --sshkey="${HOME}/.ssh/bkp_rsa" --no-sync-snap --no-privilege-elevation  ${subvol} ${USERHOST}:${POOL}/${USER}/${MACHINE}/${subvol}
+	else
+		MACHINE="$(zfs get syncoid:machine ${subvol} | grep -v NAME | awk '{print $3}')"
+		[[ ${MACHINE} == '-' ]] && { echo "syncoid:machine not set for ${subvol}"; continue; }
+		POOL="$(zfs get syncoid:pool_a ${subvol} | grep -v NAME | awk '{print $3}')"
+		[[ ${POOL} == '-' ]] && { echo "syncoid:pool_a not set for ${subvol}"; continue; }
+		echo "Sending ${subvol} to ${POOL}/$MACHINE/$subvol"
+		syncoid --sendoptions="w" --recvoptions="u" --no-sync-snap ${subvol} ${POOL}/${MACHINE}/${subvol}
+	fi
+done