152 lines
4.2 KiB
Bash
Executable file
152 lines
4.2 KiB
Bash
Executable file
#!/bin/bash
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SELF="$0"
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HOST=""
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PORT="22"
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REMOTE_PATH=""
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NAME=""
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LOGIN="$(whoami)"
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die() {
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echo -e $1 | sed -e 's-^-! -' >&2
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exit 1
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}
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usage() {
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echo -e "usage: $SELF PROFILE_NAME --host=server --port=22 --login=backup-user --directory=/backup/path" >&2
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exit 1
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}
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generate_passphrase() {
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tr -dc A-Za-z0-9 </dev/urandom | head -c 64
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}
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init_config_dir() {
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[ "x$HOST" == "x" ] && usage
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install --directory --owner=$(id -u) --group=$(id -g) --mode=600 "$CONFIGDIR" || die "Can't create directory $CONFIGDIR"
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umask 177
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generate_passphrase > "$CONFIGDIR/borg_passphrase"
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ssh-keygen -t ed25519 -N "" -q -f "$CONFIGDIR/ssh_key" -C "borg access from $(hostname --long)"
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ssh-copy-id -i "$CONFIGDIR/ssh_key.pub" -p $PORT "$LOGIN@$HOST"
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}
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set_env_config() {
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local file="$1"
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local param="$2"
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local value="$3"
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# test current config
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# file does not exist
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[ ! -e $file ] && echo "$param=$value" >> $file
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# file isn't readable
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[ ! -r $file ] && die "Config file isn't readable: $file"
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# file exists and value is set => early exit
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local curr_line="$(grep "^$param=" $file)"
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if [ "x$curr_line" == "x" ]; then
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# file ist nicht änderbar
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[ ! -w $file ] && die "Config file isn't writable: $file"
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# param isn't set => append
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echo "$param=$value" >> $file
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elif [ "x${curr_line#$param=}" != "x$value" ]; then
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# param is set with different value
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die "Environment parameter '$param' is already set to '${curr_line#$param=}' in config file: $file\nPlease confirm that you know what you're doing by manually setting the parameter to the desired value '$value'."
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fi
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return 0
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}
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test_ssh() {
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ssh -q -o "BatchMode=yes" -i "$CONFIGDIR/ssh_key" -p "$PORT" "$LOGIN@$HOST" "mkdir -p $REMOTE_PATH" \
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|| die "SSH connection attempt failed."
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return 0
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}
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test_repo_exists() {
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ssh -q -o "BatchMode=yes" -i "$CONFIGDIR/ssh_key" -p "$PORT" "$LOGIN@$HOST" "cat $REMOTE_PATH/README" 2>/dev/null | grep -q "This is a Borg Backup repository."
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return $?
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}
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invoke_borg() {
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# do some sandboxinng
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systemd-run --quiet --collect --unit=temp-borg-init-sandbox.service \
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--pipe < /etc/borg/$NAME/borg_passphrase \
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--working-directory=/tmp \
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-p "ConfigurationDirectory=borg/$NAME" \
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-p "CacheDirectory=borg/$NAME" \
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-p "ConfigurationDirectoryMode=750" \
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-p "CacheDirectoryMode=750" \
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-p "PrivateTmp=yes" \
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-p "ReadOnlyDirectories=/" \
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-p "EnvironmentFile=/etc/borg/$NAME/config.env" \
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--setenv=BORG_PASSPHRASE_FD=0 \
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--setenv=BORG_BASE_DIR=/tmp/ \
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--setenv=BORG_CONFIG_DIR=/etc/borg/$NAME \
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--setenv=BORG_CACHE_DIR=/var/cache/borg/$NAME \
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/usr/bin/borg $@
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}
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init_repo() {
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echo "> init repo"
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invoke_borg init -e repokey-blake2 || die "failed to init borg repo"
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}
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show_repo() {
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echo "> testing repo connection"
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invoke_borg info || die "failed to access borg repo"
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}
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for arg in "$@"; do
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case "$arg" in
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-h*)
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HOST="${arg#-h}"
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;;
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--host=*)
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HOST="${arg#--host=}"
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;;
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-p*)
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PORT="${arg#-p}"
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;;
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--port=*)
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PORT="${arg#--port=}"
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;;
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-l*)
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LOGIN="${arg#-l}"
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;;
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--login=*)
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LOGIN="${arg#--login=}"
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;;
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-d*)
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REMOTE_PATH="${arg#-d}"
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;;
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--directory=*)
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REMOTE_PATH="${arg#--directory=}"
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;;
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-*)
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usage
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;;
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*)
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[ "x$NAME" == "x" ] || usage
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NAME="$arg"
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;;
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esac
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done
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[ "x$NAME" == "x" ] && usage
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[ "x$REMOTE_PATH" == "x" ] && usage
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CONFIGDIR="/etc/borg/$NAME"
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echo "> checking config"
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[ -e "$CONFIGDIR" ] || init_config_dir || die "Failed setting up config directory and ssh connection"
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[ -d "$CONFIGDIR" ] || die "Config directory isn't valid: $CONFIGDIR"
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[ -r "$CONFIGDIR/borg_passphrase" ] || die "File isn't readable: $CONFIGDIR/borg_passphrase"
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[ -r "$CONFIGDIR/ssh_key" ] || die "File isn't readable: $CONFIGDIR/ssh_key"
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# write config every time, parameter may change with each invocation
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set_env_config "$CONFIGDIR/config.env" BORG_REPO "ssh://$LOGIN@$HOST:${PORT}${REMOTE_PATH}"
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set_env_config "$CONFIGDIR/config.env" BORG_RSH "ssh -i $CONFIGDIR/ssh_key"
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[ -r "$CONFIGDIR/config.env" ] || die "File isn't readable: $CONFIGDIR/config.env"
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echo "> testing ssh and destination path"
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test_ssh || die "Can't establish ssh connection! Try: ssh-copy-id -i $CONFIGDIR/ssh_key.pub -p $PORT $LOGIN@$HOST"
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echo "> testing borg repo"
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test_repo_exists || init_repo
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show_repo
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