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moby--moby/pkg/units/size.go
Mike Snitzer 2470a5ed99 devmapper: use RAMInBytes() rather than FromHumanSize()
Device Mapper needs device sizes in binary (1024) multiples.  Otherwise
kernel checks can find that the specified thin-pool device sizes aren't
a multiple of the specified thin-pool blocksize.

The name for "RAMInBytes" is likely too narrow given the new consumers
but... Also add "tebibyte" support to RAMInBytes.

Docker-DCO-1.1-Signed-off-by: Mike Snitzer <snitzer@redhat.com> (github: snitm)
2014-06-24 12:10:14 -04:00

94 lines
2.2 KiB
Go

package units
import (
"fmt"
"regexp"
"strconv"
"strings"
)
// HumanSize returns a human-readable approximation of a size
// using SI standard (eg. "44kB", "17MB")
func HumanSize(size int64) string {
i := 0
var sizef float64
sizef = float64(size)
units := []string{"B", "kB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"}
for sizef >= 1000.0 {
sizef = sizef / 1000.0
i++
}
return fmt.Sprintf("%.4g %s", sizef, units[i])
}
// FromHumanSize returns an integer from a human-readable specification of a size
// using SI standard (eg. "44kB", "17MB")
func FromHumanSize(size string) (int64, error) {
re, error := regexp.Compile("^(\\d+)([kKmMgGtTpP])?[bB]?$")
if error != nil {
return -1, fmt.Errorf("%s does not specify not a size", size)
}
matches := re.FindStringSubmatch(size)
if len(matches) != 3 {
return -1, fmt.Errorf("Invalid size: '%s'", size)
}
theSize, error := strconv.ParseInt(matches[1], 10, 0)
if error != nil {
return -1, error
}
unit := strings.ToLower(matches[2])
if unit == "k" {
theSize *= 1000
} else if unit == "m" {
theSize *= 1000 * 1000
} else if unit == "g" {
theSize *= 1000 * 1000 * 1000
} else if unit == "t" {
theSize *= 1000 * 1000 * 1000 * 1000
} else if unit == "p" {
theSize *= 1000 * 1000 * 1000 * 1000 * 1000
}
return theSize, nil
}
// Parses a human-readable string representing an amount of RAM
// in bytes, kibibytes, mebibytes, gibibytes, or tebibytes and
// returns the number of bytes, or -1 if the string is unparseable.
// Units are case-insensitive, and the 'b' suffix is optional.
func RAMInBytes(size string) (bytes int64, err error) {
re, error := regexp.Compile("^(\\d+)([kKmMgGtT])?[bB]?$")
if error != nil {
return -1, error
}
matches := re.FindStringSubmatch(size)
if len(matches) != 3 {
return -1, fmt.Errorf("Invalid size: '%s'", size)
}
memLimit, error := strconv.ParseInt(matches[1], 10, 0)
if error != nil {
return -1, error
}
unit := strings.ToLower(matches[2])
if unit == "k" {
memLimit *= 1024
} else if unit == "m" {
memLimit *= 1024 * 1024
} else if unit == "g" {
memLimit *= 1024 * 1024 * 1024
} else if unit == "t" {
memLimit *= 1024 * 1024 * 1024 * 1024
}
return memLimit, nil
}