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warn when attempting to run egg using an unsupported version of go #113

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warn when attempting to run egg using an unsupported version of go #113

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22 changes: 21 additions & 1 deletion cmd/egg/build/builder.go
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Original file line number Diff line number Diff line change
@@ -1,10 +1,12 @@
package build

import (
"fmt"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"strings"
)

type Config struct {
Expand Down Expand Up @@ -39,7 +41,15 @@ func (b *Builder) Build() error {
b.basedir = b.cfg.Basedir
}

err := b.buildPrepare()
goversion, err := b.goVersion()
if err != nil {
return err
}
if !strings.Contains(goversion, "go1.16") {
return fmt.Errorf("eggos requires go 1.16 but found %s", strings.TrimSpace(goversion))
}

err = b.buildPrepare()
if err != nil {
return err
}
Expand Down Expand Up @@ -71,6 +81,16 @@ func (b *Builder) fixGoTags() bool {
return false
}

func (b *Builder) goVersion() (string, error) {
cmd := exec.Command(b.gobin(), "version")
cmd.Env = os.Environ()
stdout, err := cmd.Output()
if err != nil {
return "", fmt.Errorf("error executing: go version: %w", err)
}
return string(stdout), nil
}

func (b *Builder) buildPkg() error {
var buildArgs []string
ldflags := "-E github.com/icexin/eggos/kernel.rt0 -T 0x100000"
Expand Down