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Merge pull request #2009 from rn/disksize

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cmd: Default disk "size" parameter to GB
This commit is contained in:
Rolf Neugebauer 2017-06-09 13:43:28 +01:00 committed by GitHub
commit 2674c999b1
2 changed files with 8 additions and 7 deletions
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2
docs/external-disk.md
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@ -9,7 +9,7 @@ In order to make the disk available, you need to tell `linuxkit` where the disk
All local `linuxkit run` methods (currently `hyperkit`, `qemu`, and `vmware`) take a `-disk` argument:
* `-disk path,size=100M,format=qcow2`. For size the default is in MB but `G` can be aspecified for GB. The format can be omitted for the platform default, and is only useful on `qemu` at present.
* `-disk path,size=100M,format=qcow2`. For size the default is in GB but an `M` can be appended to specify sizes in MB. The format can be omitted for the platform default, and is only useful on `qemu` at present.
If the _path` is specified it will use the disk at location _path_, if you do not provide `-disk `_path_, `linuxkit` assumes a default, which is _prefix_`-state/disk.img` for `hyperkit` and `vmware` and _prefix_`-disk.img` for `qemu`.

13
src/cmd/linuxkit/util.go
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@ -99,22 +99,23 @@ func stringToIntArray(l string, sep string) ([]int, error) {
return i, nil
}
// Parse a string which is either a number in MB, or a number with
// either M (for Megabytes) or G (for GigaBytes) as a suffix and
// returns the number in MB. Return 0 if string is empty.
// This function parses the "size" parameter of a disk specification
// and returns the size in MB. The "size" paramter defaults to GB, but
// the unit can be explicitly set with either a G (for GB) or M (for
// MB). It returns the disk size in MB.
func getDiskSizeMB(s string) (int, error) {
if s == "" {
return 0, nil
}
sz := len(s)
if strings.HasSuffix(s, "G") {
if strings.HasSuffix(s, "M") {
i, err := strconv.Atoi(s[:sz-1])
if err != nil {
return 0, err
}
return i * 1024, nil
return i, nil
}
if strings.HasSuffix(s, "M") {
if strings.HasSuffix(s, "G") {
s = s[:sz-1]
}
return strconv.Atoi(s)