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moby--moby/volume/volume_linux.go

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// +build linux
package volume
import (
"fmt"
"strings"
mounttypes "github.com/docker/docker/api/types/mount"
)
// ConvertTmpfsOptions converts *mounttypes.TmpfsOptions to the raw option string
// for mount(2).
func ConvertTmpfsOptions(opt *mounttypes.TmpfsOptions, readOnly bool) (string, error) {
var rawOpts []string
if readOnly {
rawOpts = append(rawOpts, "ro")
}
if opt != nil && opt.Mode != 0 {
rawOpts = append(rawOpts, fmt.Sprintf("mode=%o", opt.Mode))
}
if opt != nil && opt.SizeBytes != 0 {
// calculate suffix here, making this linux specific, but that is
// okay, since API is that way anyways.
// we do this by finding the suffix that divides evenly into the
// value, returing the value itself, with no suffix, if it fails.
//
// For the most part, we don't enforce any semantic to this values.
// The operating system will usually align this and enforce minimum
// and maximums.
var (
size = opt.SizeBytes
suffix string
)
for _, r := range []struct {
suffix string
divisor int64
}{
{"g", 1 << 30},
{"m", 1 << 20},
{"k", 1 << 10},
} {
if size%r.divisor == 0 {
size = size / r.divisor
suffix = r.suffix
break
}
}
rawOpts = append(rawOpts, fmt.Sprintf("size=%d%s", size, suffix))
}
return strings.Join(rawOpts, ","), nil
}