Created
May 23, 2019 15:05
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package main | |
import ( | |
"bytes" | |
"context" | |
"fmt" | |
"io" | |
"os" | |
"os/exec" | |
"sync" | |
"time" | |
) | |
func main() { | |
ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second) | |
defer cancel() | |
if err := execGitCmd(ctx, os.Stdout, []string{"notes", "--ref", "flux", "list"}); err != nil { | |
println(err.Error()) | |
return | |
} | |
println("OK!") | |
} | |
type threadSafeBuffer struct { | |
bytes.Buffer | |
sync.Mutex | |
} | |
func (b *threadSafeBuffer) Write(p []byte) (n int, err error) { | |
b.Lock() | |
defer b.Unlock() | |
return b.Buffer.Write(p) | |
} | |
func (b *threadSafeBuffer) ReadFrom(r io.Reader) (n int64, err error) { | |
b.Lock() | |
defer b.Unlock() | |
return b.Buffer.ReadFrom(r) | |
} | |
// execGitCmd runs a `git` command with the supplied arguments. | |
func execGitCmd(ctx context.Context, out io.Writer, args []string) error { | |
c := exec.CommandContext(ctx, "git", args...) | |
stdOutAndStdErr := &threadSafeBuffer{} | |
c.Stdout = stdOutAndStdErr | |
c.Stderr = stdOutAndStdErr | |
if out != nil { | |
c.Stdout = io.MultiWriter(c.Stdout, out) | |
} | |
err := c.Run() | |
if err != nil { | |
if len(stdOutAndStdErr.Bytes()) > 0 { | |
err = fmt.Errorf(stdOutAndStdErr.String()) | |
} | |
} | |
if ctx.Err() == context.DeadlineExceeded { | |
return fmt.Errorf("running git command: %s %v: %s", "git", args, ctx.Err().Error()) | |
} else if ctx.Err() == context.Canceled { | |
return fmt.Errorf("context was unexpectedly cancelled when running git command: %s %v", "git", args) | |
} | |
return err | |
} |
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