2018-02-15 12:13:18 +00:00
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/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package storage
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import (
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"fmt"
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"io/ioutil"
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2018-06-21 16:02:30 +00:00
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"github.com/kubernetes-incubator/node-feature-discovery/source"
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2018-02-15 12:13:18 +00:00
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)
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// Source implements FeatureSource.
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type Source struct{}
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// Name returns an identifier string for this feature source.
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func (s Source) Name() string { return "storage" }
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// Discover returns feature names for storage: nonrotationaldisk if any SSD drive present.
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2018-06-21 16:02:30 +00:00
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func (s Source) Discover() (source.Features, error) {
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features := source.Features{}
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2018-02-15 12:13:18 +00:00
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// Check if there is any non-rotational block devices attached to the node
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blockdevices, err := ioutil.ReadDir("/sys/block/")
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if err == nil {
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for _, bdev := range blockdevices {
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fname := "/sys/block/" + bdev.Name() + "/queue/rotational"
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bytes, err := ioutil.ReadFile(fname)
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if err != nil {
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return nil, fmt.Errorf("can't read rotational status: %s", err.Error())
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}
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if bytes[0] == byte('0') {
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// Non-rotational storage is present, add label.
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2018-06-21 16:02:30 +00:00
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features["nonrotationaldisk"] = true
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2018-02-15 12:13:18 +00:00
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break
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}
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}
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}
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return features, nil
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}
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