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#!/bin/bash
## When writing relation script, remember:
## - they should be idempotents
## - they can be launched while the dockers is already up
## - they are launched from the host
## - the target of the link is launched first, and get a chance to ``relation-set``
## - both side of the scripts get to use ``relation-get``.
## - use actions of other side for other side's business logic
if [ -z "$RELATION_DATA_FILE" ]; then
err "$FUNCNAME: relation does not seems to be correctly setup."
exit 1
fi
if ! [ -r "$RELATION_DATA_FILE" ]; then
err "$FUNCNAME: can't read relation's data." >&2
exit 1
fi
if [ "$(cat "$RELATION_DATA_FILE" | shyaml get-type)" == "str" ]; then
## Cached version already there
## Note that we rely on the fact that when the relations
## options are changed in the `compose.yml` file, the relation
## data file is recreated from the values of the
## `compose.yml`.
info "Previous relation data is still valid."
exit 0
fi
. lib/common
schedule=$(relation-get schedule) || true
lock_opts=(-D -p 10)
command=(
docker run --rm \
--network ${PROJECT_NAME}_default \
-v "$LOCAL_DB_PASSFILE":/root/.my.cnf \
-v "$HOST_CHARM_STORE/${CHARM_REL_PATH#${CHARM_STORE}/}/resources/bin/mysql-backup:/usr/sbin/mysql-backup" \
-v "$SERVICE_DATASTORE/var/backups/mysql:/var/backups/mysql" \
--entrypoint mysql-backup \
"$DOCKER_BASE_IMAGE" --host "${SERVICE_NAME}"
)
quoted_command=()
for arg in "${command[@]}"; do
quoted_command+=("$(printf "%q" "$arg")")
done
printf "(%s) {%s} %s\n" \
"$schedule" \
"${lock_opts[*]}" \
"${quoted_command[*]}" > "$RELATION_DATA_FILE"