xcaddy/platforms.go

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2020-04-23 21:34:29 +01:00
package xcaddy
import (
"encoding/json"
"os/exec"
)
// Compile contains parameters for compilation.
type Compile struct {
Platform
Cgo bool `json:"cgo,omitempty"`
}
// Platform represents a build target.
type Platform struct {
OS string `json:"os,omitempty"`
Arch string `json:"arch,omitempty"`
ARM string `json:"arm,omitempty"`
}
// SupportedPlatforms runs `go tool dist list` to make
// a list of possible build targets.
func SupportedPlatforms() ([]Compile, error) {
out, err := exec.Command("go", "tool", "dist", "list", "-json").Output()
if err != nil {
return nil, err
}
var dists []dist
err = json.Unmarshal(out, &dists)
if err != nil {
return nil, err
}
// translate from the go command's output structure
// to our own user-facing structure
var compiles []Compile
for _, d := range dists {
comp := d.toCompile()
if d.GOARCH == "arm" {
if d.GOOS == "linux" {
// only linux supports ARMv5; see https://github.com/golang/go/issues/18418
comp.ARM = "5"
compiles = append(compiles, comp)
}
comp.ARM = "6"
compiles = append(compiles, comp)
comp.ARM = "7"
compiles = append(compiles, comp)
} else {
compiles = append(compiles, comp)
}
}
return compiles, nil
}
// dist is the structure that fits the output
// of the `go tool dist list -json` command.
type dist struct {
GOOS string `json:"GOOS"`
GOARCH string `json:"GOARCH"`
CgoSupported bool `json:"CgoSupported"`
}
func (d dist) toCompile() Compile {
return Compile{
Platform: Platform{
OS: d.GOOS,
Arch: d.GOARCH,
},
Cgo: d.CgoSupported,
}
}