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usage.go
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usage.go
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// Copyright (c) 2018-2019 Sylabs, Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package fs
import (
"fmt"
"os"
"path/filepath"
"github.com/sylabs/singularity/pkg/util/fs/proc"
)
// UsageInfo holds metrics on fs usage.
type UsageInfo struct {
MountPoint string
Bytes int64
Inodes int64
}
// Usage collects fs usage for specific location, often a directory.
func Usage(path string) (*UsageInfo, error) {
mount, err := proc.ParentMount(path)
if err != nil {
return nil, fmt.Errorf("could not get mount point: %v", err)
}
bytes, inodes, err := fetchStat(path)
if err != nil {
return nil, fmt.Errorf("could not fetch fs stat: %v", err)
}
return &UsageInfo{
MountPoint: mount,
Bytes: bytes,
Inodes: inodes,
}, nil
}
func fetchStat(path string) (int64, int64, error) {
storeDir, err := os.Open(path)
if err != nil {
return 0, 0, fmt.Errorf("could not open %q: %v", path, err)
}
defer storeDir.Close()
fi, err := storeDir.Stat()
if err != nil {
return 0, 0, fmt.Errorf("could not get info for %q: %v", path, err)
}
fii, err := storeDir.Readdir(-1)
if err != nil {
return 0, 0, fmt.Errorf("could not scan %q: %v", path, err)
}
var bytes int64
var inodes int64
for _, fi := range fii {
if fi.IsDir() {
b, i, err := fetchStat(filepath.Join(path, fi.Name()))
if err != nil {
return 0, 0, fmt.Errorf("could not fetch info: %v", err)
}
bytes += b
inodes += i
} else {
bytes += fi.Size()
inodes++
}
}
// add directory info as well
inodes++
bytes += fi.Size()
return bytes, inodes, nil
}