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platforms: Add MustParse

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This function is analogous to `regexp.MustCompile` and can simplify production
of a `Platform` from a hard-coded strings, e.g. for global variable
initialisation.

Signed-off-by: Ian Campbell <ian.campbell@docker.com>
This commit is contained in:
Ian Campbell 2018-08-15 11:30:46 +01:00
parent 1ba4aa04b4
commit c83f9773bc
1 changed files with 11 additions and 0 deletions
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11
platforms/platforms.go
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@ -109,6 +109,7 @@ package platforms
import (
"regexp"
"runtime"
"strconv"
"strings"
"github.com/containerd/containerd/errdefs"
@ -230,6 +231,16 @@ func Parse(specifier string) (specs.Platform, error) {
return specs.Platform{}, errors.Wrapf(errdefs.ErrInvalidArgument, "%q: cannot parse platform specifier", specifier)
}
// MustParse is like Parses but panics if the specifier cannot be parsed.
// Simplifies initialization of global variables.
func MustParse(specifier string) specs.Platform {
p, err := Parse(specifier)
if err != nil {
panic("platform: Parse(" + strconv.Quote(specifier) + "): " + err.Error())
}
return p
}
// Format returns a string specifier from the provided platform specification.
func Format(platform specs.Platform) string {
if platform.OS == "" {