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override DOCKER_HOST environment variable directly

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Rather than only overriding the Go docker client
configuration, we now override the process DOCKER_HOST so
as to properly configure docker-cli child processes.
This commit is contained in:
Charlie Moog 2021-12-27 23:58:42 -06:00
parent 892fc090b6
commit 0bd4168dc9
No known key found for this signature in database
GPG key ID: 54C2F30EA784F821
1 changed files with 17 additions and 5 deletions
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22
pkg/commands/docker.go
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@ -73,9 +73,12 @@ func (c *DockerCommand) NewCommandObject(obj CommandObject) CommandObject {
return defaultObj
}
func handleSSHHosts(c *client.Client) error {
// handleSSHDockerHost overrides the DOCKER_HOST environment variable
// to point towards a local unix socket tunneled over SSH to the specified ssh host.
func handleSSHDockerHost() error {
const key = "DOCKER_HOST"
ctx := context.Background()
u, err := url.Parse(os.Getenv("DOCKER_HOST"))
u, err := url.Parse(os.Getenv(key))
if err != nil {
// if no or an invalid docker host is specified, continue nominally
return nil
@ -87,7 +90,12 @@ func handleSSHHosts(c *client.Client) error {
if err != nil {
return fmt.Errorf("tunnel ssh docker host: %w", err)
}
return client.WithHost(newDockerHost)(c)
err = os.Setenv(key, newDockerHost)
if err != nil {
return fmt.Errorf("override DOCKER_HOST to tunneled socket: %w", err)
}
return nil
}
return nil
}
@ -179,11 +187,15 @@ func tunnelSSH(ctx context.Context, host, localSocket string) error {
//
// Handle special cases including `ssh://` host schemes.
func clientBuilder(c *client.Client) error {
err := client.FromEnv(c)
err := handleSSHDockerHost()
if err != nil {
return err
}
return handleSSHHosts(c)
err = client.FromEnv(c)
if err != nil {
return err
}
return nil
}
// NewDockerCommand it runs docker commands