mirror of
https://github.com/linuxkit/linuxkit.git
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065af9707c
Generated largely from the specified config; small parts taken from `docker image inspect`, such as the command line. Renamed some of the yaml keys to match the OCI spec rather than Docker Compose as we decided they are more readable, no more underscores. Add some extra functionality - tmpfs specification - fully general mount specification - no new privileges can be specified now For nostalgic reasons, using engine-api to talk to the docker cli as we only need an old API version, and it is nice and easy to vendor... Signed-off-by: Justin Cormack <justin.cormack@docker.com>
96 lines
2.4 KiB
Go
96 lines
2.4 KiB
Go
package units
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import (
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"fmt"
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"regexp"
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"strconv"
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"strings"
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)
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// See: http://en.wikipedia.org/wiki/Binary_prefix
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const (
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// Decimal
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KB = 1000
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MB = 1000 * KB
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GB = 1000 * MB
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TB = 1000 * GB
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PB = 1000 * TB
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// Binary
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KiB = 1024
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MiB = 1024 * KiB
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GiB = 1024 * MiB
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TiB = 1024 * GiB
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PiB = 1024 * TiB
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)
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type unitMap map[string]int64
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var (
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decimalMap = unitMap{"k": KB, "m": MB, "g": GB, "t": TB, "p": PB}
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binaryMap = unitMap{"k": KiB, "m": MiB, "g": GiB, "t": TiB, "p": PiB}
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sizeRegex = regexp.MustCompile(`^(\d+)([kKmMgGtTpP])?[bB]?$`)
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)
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var decimapAbbrs = []string{"B", "kB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"}
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var binaryAbbrs = []string{"B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "ZiB", "YiB"}
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// CustomSize returns a human-readable approximation of a size
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// using custom format.
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func CustomSize(format string, size float64, base float64, _map []string) string {
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i := 0
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for size >= base {
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size = size / base
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i++
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}
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return fmt.Sprintf(format, size, _map[i])
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}
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// HumanSize returns a human-readable approximation of a size
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// capped at 4 valid numbers (eg. "2.746 MB", "796 KB").
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func HumanSize(size float64) string {
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return CustomSize("%.4g %s", size, 1000.0, decimapAbbrs)
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}
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// BytesSize returns a human-readable size in bytes, kibibytes,
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// mebibytes, gibibytes, or tebibytes (eg. "44kiB", "17MiB").
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func BytesSize(size float64) string {
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return CustomSize("%.4g %s", size, 1024.0, binaryAbbrs)
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}
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// FromHumanSize returns an integer from a human-readable specification of a
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// size using SI standard (eg. "44kB", "17MB").
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func FromHumanSize(size string) (int64, error) {
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return parseSize(size, decimalMap)
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}
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// RAMInBytes parses a human-readable string representing an amount of RAM
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// in bytes, kibibytes, mebibytes, gibibytes, or tebibytes and
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// returns the number of bytes, or -1 if the string is unparseable.
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// Units are case-insensitive, and the 'b' suffix is optional.
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func RAMInBytes(size string) (int64, error) {
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return parseSize(size, binaryMap)
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}
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// Parses the human-readable size string into the amount it represents.
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func parseSize(sizeStr string, uMap unitMap) (int64, error) {
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matches := sizeRegex.FindStringSubmatch(sizeStr)
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if len(matches) != 3 {
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return -1, fmt.Errorf("invalid size: '%s'", sizeStr)
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}
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size, err := strconv.ParseInt(matches[1], 10, 0)
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if err != nil {
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return -1, err
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}
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unitPrefix := strings.ToLower(matches[2])
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if mul, ok := uMap[unitPrefix]; ok {
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size *= mul
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}
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return size, nil
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}
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