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ref(docker.go): container config fields on Driver no longer pointers #206

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merged 4 commits into from
May 2, 2020
Merged

ref(docker.go): container config fields on Driver no longer pointers #206

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af934e4
ref(docker.go): export ApplyConfigurationOptions
vdice Apr 22, 2020
c46b74f
ref(docker.go): container config fields on Driver no longer pointers
vdice Apr 22, 2020
9b6875f
keep deep copy logic for container config accessors
vdice Apr 24, 2020
5395191
add config modification test
vdice Apr 24, 2020
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49 changes: 14 additions & 35 deletions driver/docker/docker.go
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,6 @@ package docker
import (
"archive/tar"
"context"
"errors"
"fmt"
"io"
"io/ioutil"
Expand All @@ -21,7 +20,6 @@ import (
"github.com/docker/docker/pkg/jsonmessage"
"github.com/docker/docker/pkg/stdcopy"
"github.com/docker/docker/registry"
copystructure "github.com/mitchellh/copystructure"
)

// Driver is capable of running Docker invocation images using Docker itself.
Expand All @@ -33,8 +31,8 @@ type Driver struct {
dockerConfigurationOptions []ConfigurationOption
containerOut io.Writer
containerErr io.Writer
containerHostCfg *container.HostConfig
containerCfg *container.Config
containerHostCfg container.HostConfig
containerCfg container.Config
}

// Run executes the Docker driver
Expand All @@ -54,34 +52,14 @@ func (d *Driver) AddConfigurationOptions(opts ...ConfigurationOption) {

// GetContainerConfig returns a copy of the container configuration
// used by the driver during container exec
func (d *Driver) GetContainerConfig() (container.Config, error) {
cpy, err := copystructure.Copy(*d.containerCfg)
if err != nil {
return container.Config{}, err
}

containerCfg, ok := cpy.(container.Config)
if !ok {
return container.Config{}, errors.New("unable to process container config")
}

return containerCfg, nil
func (d *Driver) GetContainerConfig() container.Config {
return d.containerCfg
}

// GetContainerHostConfig returns a copy of the container host configuration
// used by the driver during container exec
func (d *Driver) GetContainerHostConfig() (container.HostConfig, error) {
cpy, err := copystructure.Copy(*d.containerHostCfg)
if err != nil {
return container.HostConfig{}, err
}

hostCfg, ok := cpy.(container.HostConfig)
if !ok {
return container.HostConfig{}, errors.New("unable to process container host config")
}

return hostCfg, nil
func (d *Driver) GetContainerHostConfig() container.HostConfig {
return d.containerHostCfg
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}

// Config returns the Docker driver configuration options
Expand Down Expand Up @@ -191,27 +169,27 @@ func (d *Driver) exec(op *driver.Operation) (driver.OperationResult, error) {
env = append(env, fmt.Sprintf("%s=%v", k, v))
}

d.containerCfg = &container.Config{
d.containerCfg = container.Config{
Image: op.Image.Image,
Env: env,
Entrypoint: strslice.StrSlice{"/cnab/app/run"},
AttachStderr: true,
AttachStdout: true,
}

d.containerHostCfg = &container.HostConfig{}
if err := d.applyConfigurationOptions(); err != nil {
d.containerHostCfg = container.HostConfig{}
if err := d.ApplyConfigurationOptions(); err != nil {
return driver.OperationResult{}, err
}

resp, err := cli.Client().ContainerCreate(ctx, d.containerCfg, d.containerHostCfg, nil, "")
resp, err := cli.Client().ContainerCreate(ctx, &d.containerCfg, &d.containerHostCfg, nil, "")
switch {
case client.IsErrNotFound(err):
fmt.Fprintf(cli.Err(), "Unable to find image '%s' locally\n", op.Image.Image)
if err := pullImage(ctx, cli, op.Image.Image); err != nil {
return driver.OperationResult{}, err
}
if resp, err = cli.Client().ContainerCreate(ctx, d.containerCfg, d.containerHostCfg, nil, ""); err != nil {
if resp, err = cli.Client().ContainerCreate(ctx, &d.containerCfg, &d.containerHostCfg, nil, ""); err != nil {
return driver.OperationResult{}, fmt.Errorf("cannot create container: %v", err)
}
case err != nil:
Expand Down Expand Up @@ -293,9 +271,10 @@ func (d *Driver) exec(op *driver.Operation) (driver.OperationResult, error) {
return opResult, err
}

func (d *Driver) applyConfigurationOptions() error {
// ApplyConfigurationOptions applies the configuration options set on the driver
func (d *Driver) ApplyConfigurationOptions() error {
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for _, opt := range d.dockerConfigurationOptions {
if err := opt(d.containerCfg, d.containerHostCfg); err != nil {
if err := opt(&d.containerCfg, &d.containerHostCfg); err != nil {
return err
}
}
Expand Down
23 changes: 7 additions & 16 deletions driver/docker/docker_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -14,32 +14,25 @@ func TestDriver_GetConfigurationOptions(t *testing.T) {
is.NotNil(d)
is.True(d.Handles(driver.ImageTypeDocker))

t.Run("no configuration options", func(t *testing.T) {
d.containerCfg = &container.Config{}
d.containerHostCfg = &container.HostConfig{}

err := d.applyConfigurationOptions()
t.Run("empty configuration options", func(t *testing.T) {
err := d.ApplyConfigurationOptions()
is.NoError(err)

cfg, err := d.GetContainerConfig()
is.NoError(err)
cfg := d.GetContainerConfig()
is.Equal(container.Config{}, cfg)

hostCfg, err := d.GetContainerHostConfig()
is.NoError(err)
hostCfg := d.GetContainerHostConfig()
is.Equal(container.HostConfig{}, hostCfg)
})

t.Run("configuration options", func(t *testing.T) {
d.containerCfg = &container.Config{}
d.containerHostCfg = &container.HostConfig{}
d.AddConfigurationOptions(func(cfg *container.Config, hostCfg *container.HostConfig) error {
cfg.User = "cnabby"
hostCfg.Privileged = true
return nil
})

err := d.applyConfigurationOptions()
err := d.ApplyConfigurationOptions()
is.NoError(err)

expectedContainerCfg := container.Config{
Expand All @@ -49,12 +42,10 @@ func TestDriver_GetConfigurationOptions(t *testing.T) {
Privileged: true,
}

cfg, err := d.GetContainerConfig()
is.NoError(err)
cfg := d.GetContainerConfig()
is.Equal(expectedContainerCfg, cfg)

hostCfg, err := d.GetContainerHostConfig()
is.NoError(err)
hostCfg := d.GetContainerHostConfig()
is.Equal(expectedHostCfg, hostCfg)
})
}