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main.go
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main.go
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package main
import (
"bufio"
"context"
"fmt"
"io"
"os"
"os/exec"
"sync"
"gitlab.com/gitlab-org/gitlab-runner/common"
"gitlab.com/gitlab-org/gitlab-runner/helpers"
)
var images = []string{
common.TestAlpineImage,
common.TestAlpineNoRootImage,
common.TestDockerGitImage,
common.TestDockerDindImage,
}
type rewriter struct {
ctx context.Context
prefix string
input *bufio.Reader
}
func (rw *rewriter) watch() {
for {
select {
case <-rw.ctx.Done():
return
case err := <-rw.rewriteInput():
if err != nil {
rw.writeToOutput(fmt.Sprintf("Error while reading command output: %v", err))
return
}
}
}
}
func (rw *rewriter) rewriteInput() <-chan error {
e := make(chan error)
go func() {
line, err := rw.input.ReadString('\n')
if err == nil || err == io.EOF {
rw.writeToOutput(line)
e <- nil
return
}
e <- err
}()
return e
}
func (rw *rewriter) writeToOutput(line string) {
fmt.Printf("%s[%s]%s %s", helpers.ANSI_YELLOW, rw.prefix, helpers.ANSI_RESET, line)
}
func newRewriter(ctx context.Context, prefix string) io.Writer {
pr, pw, err := os.Pipe()
if err != nil {
panic(err)
}
w := &rewriter{
ctx: ctx,
prefix: prefix,
input: bufio.NewReader(pr),
}
go w.watch()
return pw
}
func pullImage(wg *sync.WaitGroup, name string) {
ctx, cancel := context.WithCancel(context.Background())
defer func() {
cancel()
wg.Done()
}()
output := newRewriter(ctx, name)
cmd := exec.Command("docker", "pull", name)
cmd.Stdout = output
cmd.Stderr = output
err := cmd.Run()
if err != nil {
panic(err)
}
}
func main() {
wg := new(sync.WaitGroup)
for _, image := range images {
wg.Add(1)
go pullImage(wg, image)
}
wg.Wait()
}