65 lines
1.9 KiB
Go
65 lines
1.9 KiB
Go
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// +build darwin linux
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package fingerprint
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import (
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"fmt"
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"os/exec"
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"path/filepath"
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"runtime"
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"strconv"
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"strings"
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)
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// diskFree inspects the filesystem for path and returns the volume name and
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// the total and free bytes available on the file system.
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func (f *StorageFingerprint) diskFree(path string) (volume string, total, free uint64, err error) {
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absPath, err := filepath.Abs(path)
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if err != nil {
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return "", 0, 0, fmt.Errorf("failed to determine absolute path for %s", path)
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}
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// Use -k to standardize the output values between darwin and linux
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var dfArgs string
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if runtime.GOOS == "linux" {
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// df on linux needs the -P option to prevent linebreaks on long filesystem paths
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dfArgs = "-kP"
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} else {
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dfArgs = "-k"
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}
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mountOutput, err := exec.Command("df", dfArgs, absPath).Output()
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if err != nil {
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return "", 0, 0, fmt.Errorf("failed to determine mount point for %s", absPath)
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}
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// Output looks something like:
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// Filesystem 1024-blocks Used Available Capacity iused ifree %iused Mounted on
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// /dev/disk1 487385240 423722532 63406708 87% 105994631 15851677 87% /
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// [0] volume [1] capacity [2] SKIP [3] free
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lines := strings.Split(string(mountOutput), "\n")
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if len(lines) < 2 {
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return "", 0, 0, fmt.Errorf("failed to parse `df` output; expected at least 2 lines")
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}
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fields := strings.Fields(lines[1])
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if len(fields) < 4 {
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return "", 0, 0, fmt.Errorf("failed to parse `df` output; expected at least 4 columns")
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}
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volume = fields[0]
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total, err = strconv.ParseUint(fields[1], 10, 64)
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if err != nil {
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return "", 0, 0, fmt.Errorf("failed to parse storage.bytestotal size in kilobytes")
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}
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// convert to bytes
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total *= 1024
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free, err = strconv.ParseUint(fields[3], 10, 64)
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if err != nil {
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return "", 0, 0, fmt.Errorf("failed to parse storage.bytesfree size in kilobytes")
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}
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// convert to bytes
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free *= 1024
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return volume, total, free, nil
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}
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