OpenWrt backup script with git configuration versioning

backup.sh

#!/bin/bash
DATE=`date -Idate`
USER="root"
HOSTS=("<host1>" ... "<hostn>")

commit_single_host_to_git ()
{
        local host=${1}

        local backup_filename="backup-${host}-${DATE}.tar.gz"
        if [ -f ${backup_filename} ]; then
                pushd ../git
                git checkout ${host}
                tar xf ../${DATE}/${backup_filename}
                git add -A .
                git commit -m "Backup ${DATE}"
                popd
        fi
}

backup_single_host ()
{
        local host=${1}

        local backup_filename="backup-${host}-${DATE}.tar.gz"
        if [ ! -f ${backup_filename} ]; then
                echo "${host}: Backing up..."
                ssh ${USER}@${host} 'sysupgrade --create-backup -' > ${backup_filename};
                if [ $? -ne 0 ]; then
                        echo "${host}: Backup failed."
                        rm ${backup_filename}
                fi
        else
                echo "${host}: Backed up, skipping."
        fi

        local flashdump_filename="flashdump-${host}-${DATE}.bin.gz"
        if [ ! -f ${flashdump_filename} ]; then
                echo "${host}: Dumping flash..."
                ssh ${USER}@${host} '/root/dump_flash.sh'  > ${flashdump_filename};
                if [ $? -ne 0 ]; then
                        echo "${host}: Flash dump failed."
                        rm ${flashdump_filename}
                fi
        else
                echo "${host}: Flash already dumped, skipping."
        fi

        local pkglist_filename="pkglist-${host}-${DATE}.txt"
        if [ ! -f ${pkglist_filename} ]; then
                echo "${host}: Saving package list"
                ssh ${USER}@${host} 'opkg list-installed' > ${pkglist_filename};
                if [ $? -ne 0 ]; then
                        echo "${host}: Saving package list failed."
                        rm ${pkglist_filename}
                fi
        else
                echo "${host}: Packages already saved, skipping."
        fi
        echo "${host}: Done."
}

set -o pipefail

mkdir -p ${DATE}
cd ${DATE}

for host in ${HOSTS[@]}; do
        backup_single_host ${host} &
done
wait
for host in ${HOSTS[@]}; do
        commit_single_host_to_git ${host}
done

dump_flash.sh

#!/bin/sh
cat /dev/mtd0 /dev/mtd5 /dev/mtd4 | gzip -c