0k-charms/rsync-backup-target/hooks/init

#!/bin/bash

## Init is run on host
## For now it is run every time the script is launched, but
## it should be launched only once after build.

## Accessible variables are:
## - SERVICE_NAME        Name of current service
## - DOCKER_BASE_IMAGE   Base image from which this service might be built if any
## - SERVICE_DATASTORE           Location on host of the DATASTORE of this service
## - SERVICE_CONFIGSTORE         Location on host of the CONFIGSTORE of this service


set -e

service_def=$(get_compose_service_def "$SERVICE_NAME")

keys=$(echo "$service_def" | shyaml -y get-value options.keys 2>/dev/null) || {
    err "You must specify a ${WHITE}keys${NORMAL} struct to use this service"
    exit 1
}

[ "$(echo "$keys" | shyaml -y get-type 2>/dev/null)" == "struct" ] || {
    err "Invalid value type for ${WHITE}keys${NORMAL}, please provide a struct"
    exit 1
}

local_path_key=/etc/rsync/keys
host_path_key="$SERVICE_CONFIGSTORE${local_path_key}"
key_nb=0

## ident are unique by construction (they are struct keys)
## but keys need to be also unique
declare -A keys
while read-0 ident key; do
    if [ "${keys[$key]}" ]; then
        err "Duplicate key: key for ident '$ident' is same as ident '${keys["$key"]}'."
        exit 1
    fi
    if ! [[ "$ident" =~ ^[a-zA-Z0-9._-]+$ ]]; then
        err "Invalid identifier '$ident'," \
            "please use only alphanumerical char, dots, dash or underscores."
        exit 1
    fi
    debug "Creating access key for ${ident}" || true
    echo "$key" | file_put "$host_path_key/${ident}.pub"
    keys["$key"]="$ident"
done < <(echo "$keys" | shyaml key-values-0)

debug "Adding config hash to enable recreating upon config change."
config_hash=$({
                 ## XXXvlab: ``env -i`` sole purpose is to protect find
                 ## against big shell environments, and prevent it to fail.
                 env -i find "${host_path_key}" \
                      -name \*.pub -exec md5sum {} \;
             } | md5_compat) || exit 1

init-config-add "\
$SERVICE_NAME:
  volumes:
    - $host_path_key:$local_path_key:ro
  labels:
    - compose.config_hash=$config_hash
"