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resolve_sync_destinations() {
# destinations_ref is a nameref output filled by resolve_config_array.
# shellcheck disable=SC2034
local -n destinations_ref="$1"; shift
local sync_decl
# A list of rsync destinations is inherently a list, and the only
# unambiguous spelling is a Bash array: SYNC_DESTINATIONS=( '/path/with
# spaces/' ) preserves embedded spaces, whereas a scalar string would be
# word-split (e.g. "/path/with spaces/" -> two broken destinations passed
# to rsync). So we reject scalar declarations outright instead of silently
# word-splitting them. (TAR_OPTS deliberately keeps scalar word-splitting:
# turning "-c -v" into separate options is the desired behaviour there.)
#
# declare -p fails only when SYNC_DESTINATIONS was never set; that is a
# legitimate "unset" case handled by the || true below, so we skip the
# array-vs-scalar check entirely when the variable does not exist.
if sync_decl=$(declare -p SYNC_DESTINATIONS 2>/dev/null); then
case "$sync_decl" in
declare\ -a*) ;;
*)
config_error \
'SYNC_DESTINATIONS must be an array, e.g. SYNC_DESTINATIONS=( '\''dest1'\'' '\''dest2'\'' )'
return 1
;;
esac
fi
# Parse SYNC_DESTINATIONS (always an array at this point) via the shared
# config-array helper. Unlike TAR_OPTS there is no default: an unset or
# empty value simply yields an empty destinations array for callers to
# validate. The helper returns non-zero when SYNC_DESTINATIONS was never
# declared; we ignore that (|| true) since the already-empty array is
# exactly the desired result, and the bare non-zero return would otherwise
# trip set -e.
resolve_config_array SYNC_DESTINATIONS destinations_ref || true
}
sync_dist() {
local destination
local -a rsync_args=(-av)
local -a sync_destinations=()
resolve_sync_destinations sync_destinations
if [ "$SYNC_DELETE" = yes ]; then
rsync_args+=(--delete)
fi
for destination in "${sync_destinations[@]}"; do
log_info "Syncing $DIST_DIR/ to $destination"
rsync "${rsync_args[@]}" "$DIST_DIR/" "$destination"
done
}
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