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resource_docker_image_funcs.go
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resource_docker_image_funcs.go
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package docker
import (
"fmt"
"strings"
dc "github.com/fsouza/go-dockerclient"
"github.com/hashicorp/terraform/helper/schema"
)
func resourceDockerImageCreate(d *schema.ResourceData, meta interface{}) error {
client := meta.(*dc.Client)
apiImage, err := findImage(d, client)
if err != nil {
return fmt.Errorf("Unable to read Docker image into resource: %s", err)
}
d.SetId(apiImage.ID + d.Get("name").(string))
d.Set("latest", apiImage.ID)
return nil
}
func resourceDockerImageRead(d *schema.ResourceData, meta interface{}) error {
client := meta.(*dc.Client)
var data Data
if err := fetchLocalImages(&data, client); err != nil {
return fmt.Errorf("Error reading docker image list: %s", err)
}
foundImage := searchLocalImages(data, d.Get("name").(string))
if foundImage != nil {
d.Set("latest", foundImage.ID)
} else {
d.SetId("")
}
return nil
}
func resourceDockerImageUpdate(d *schema.ResourceData, meta interface{}) error {
// We need to re-read in case switching parameters affects
// the value of "latest" or others
client := meta.(*dc.Client)
apiImage, err := findImage(d, client)
if err != nil {
return fmt.Errorf("Unable to read Docker image into resource: %s", err)
}
d.Set("latest", apiImage.ID)
return nil
}
func resourceDockerImageDelete(d *schema.ResourceData, meta interface{}) error {
client := meta.(*dc.Client)
err := removeImage(d, client)
if err != nil {
return fmt.Errorf("Unable to remove Docker image: %s", err)
}
d.SetId("")
return nil
}
func searchLocalImages(data Data, imageName string) *dc.APIImages {
if apiImage, ok := data.DockerImages[imageName]; ok {
return apiImage
}
if apiImage, ok := data.DockerImages[imageName+":latest"]; ok {
imageName = imageName + ":latest"
return apiImage
}
return nil
}
func removeImage(d *schema.ResourceData, client *dc.Client) error {
var data Data
if keepLocally := d.Get("keep_locally").(bool); keepLocally {
return nil
}
if err := fetchLocalImages(&data, client); err != nil {
return err
}
imageName := d.Get("name").(string)
if imageName == "" {
return fmt.Errorf("Empty image name is not allowed")
}
foundImage := searchLocalImages(data, imageName)
if foundImage != nil {
err := client.RemoveImage(foundImage.ID)
if err != nil {
return err
}
}
return nil
}
func fetchLocalImages(data *Data, client *dc.Client) error {
images, err := client.ListImages(dc.ListImagesOptions{All: false})
if err != nil {
return fmt.Errorf("Unable to list Docker images: %s", err)
}
if data.DockerImages == nil {
data.DockerImages = make(map[string]*dc.APIImages)
}
// Docker uses different nomenclatures in different places...sometimes a short
// ID, sometimes long, etc. So we store both in the map so we can always find
// the same image object. We store the tags, too.
for i, image := range images {
data.DockerImages[image.ID[:12]] = &images[i]
data.DockerImages[image.ID] = &images[i]
for _, repotag := range image.RepoTags {
data.DockerImages[repotag] = &images[i]
}
}
return nil
}
func pullImage(data *Data, client *dc.Client, image string) error {
// TODO: Test local registry handling. It should be working
// based on the code that was ported over
pullOpts := parseImageOptions(image)
auth := dc.AuthConfiguration{}
if err := client.PullImage(pullOpts, auth); err != nil {
return fmt.Errorf("Error pulling image %s: %s\n", image, err)
}
return fetchLocalImages(data, client)
}
func parseImageOptions(image string) dc.PullImageOptions {
pullOpts := dc.PullImageOptions{}
splitImageName := strings.Split(image, ":")
switch len(splitImageName) {
// It's in registry:port/username/repo:tag or registry:port/repo:tag format
case 3:
splitPortRepo := strings.Split(splitImageName[1], "/")
pullOpts.Registry = splitImageName[0] + ":" + splitPortRepo[0]
pullOpts.Tag = splitImageName[2]
pullOpts.Repository = pullOpts.Registry + "/" + strings.Join(splitPortRepo[1:], "/")
// It's either registry:port/username/repo, registry:port/repo,
// or repo:tag with default registry
case 2:
splitPortRepo := strings.Split(splitImageName[1], "/")
switch len(splitPortRepo) {
// repo:tag
case 1:
pullOpts.Repository = splitImageName[0]
pullOpts.Tag = splitImageName[1]
// registry:port/username/repo or registry:port/repo
default:
pullOpts.Registry = splitImageName[0] + ":" + splitPortRepo[0]
pullOpts.Repository = pullOpts.Registry + "/" + strings.Join(splitPortRepo[1:], "/")
pullOpts.Tag = "latest"
}
// Plain username/repo or repo
default:
pullOpts.Repository = image
}
return pullOpts
}
func findImage(d *schema.ResourceData, client *dc.Client) (*dc.APIImages, error) {
var data Data
if err := fetchLocalImages(&data, client); err != nil {
return nil, err
}
imageName := d.Get("name").(string)
if imageName == "" {
return nil, fmt.Errorf("Empty image name is not allowed")
}
foundImage := searchLocalImages(data, imageName)
if foundImage == nil {
if err := pullImage(&data, client, imageName); err != nil {
return nil, fmt.Errorf("Unable to pull image %s: %s", imageName, err)
}
}
foundImage = searchLocalImages(data, imageName)
if foundImage != nil {
return foundImage, nil
}
return nil, fmt.Errorf("Unable to find or pull image %s", imageName)
}