forked from ohsu-comp-bio/funnel
/
docker.go
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/
docker.go
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package util
import (
"context"
"errors"
"github.com/docker/docker/client"
"os"
"regexp"
"time"
)
// NewDockerClient returns a new docker client. This util handles
// working around some client/server API version mismatch issues.
func NewDockerClient() (*client.Client, error) {
dclient, err := client.NewEnvClient()
if err != nil {
return nil, err
}
// If the api version is not set test if the client can communicate with the
// server; if not infer API version from error message and inform the client
// to use that version for future communication
if os.Getenv("DOCKER_API_VERSION") == "" {
ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
defer cancel()
_, err := dclient.ServerVersion(ctx)
if err != nil {
re := regexp.MustCompile(`([0-9\.]+)`)
version := re.FindAllString(err.Error(), -1)
if version == nil {
return nil, errors.New("Can't connect docker client")
}
// Error message example:
// Error getting metadata for container: Error response from daemon: client is newer than server (client API version: 1.26, server API version: 1.24)
os.Setenv("DOCKER_API_VERSION", version[1])
return NewDockerClient()
}
}
return dclient, nil
}