feat: support container image datasource (#30)

docs/data-sources/container_image.md

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+---
+# generated by https://github.com/hashicorp/terraform-plugin-docs
+page_title: "ec_container_image Data Source - terraform-provider-ec"
+subcategory: ""
+description: |-
+  Use this data source to access information about an existing Image.
+---
+
+# ec_container_image (Data Source)
+
+Use this data source to access information about an existing Image.
+
+
+
+<!-- schema generated by tfplugindocs -->
+## Schema
+
+### Optional
+
+- `instance` (String) Name is an instance name configured in the provider.
+- `metadata` (Block List, Max: 1) Image object metadata. (see [below for nested schema](#nestedblock--metadata))
+- `spec` (Block List, Max: 1) Spec defines the desired image. (see [below for nested schema](#nestedblock--spec))
+
+### Read-Only
+
+- `id` (String) The ID of this resource.
+
+<a id="nestedblock--metadata"></a>
+### Nested Schema for `metadata`
+
+Required:
+
+- `branch` (String) Branch defines the branch within which each name must be unique.
+
+Optional:
+
+- `object_meta` (Block List, Max: 1) (see [below for nested schema](#nestedblock--metadata--object_meta))
+
+<a id="nestedblock--metadata--object_meta"></a>
+### Nested Schema for `metadata.object_meta`
+
+Optional:
+
+- `annotations` (Map of String) An unstructured map of keys and values stored on an object.
+- `environment` (String) The name of the environment the object belongs to.
+- `labels` (Map of String) A map of keys and values that can be used to organize and categorize objects.
+- `name` (String) The unique object name within its scope.
+
+Read-Only:
+
+- `revision` (String) An opaque resource revision.
+- `uid` (String) A unique identifier for each an object.
+
+
+
+<a id="nestedblock--spec"></a>
+### Nested Schema for `spec`
+
+Required:
+
+- `image` (String) Image is the image name.
+
+Optional:
+
+- `tag` (String) Tag is the image tag.
+
+Read-Only:
+
+- `digest` (String) Digest is the hash of the image.
+- `registry` (String) Registry is the registry that contains the image.

docs/data-sources/container_image_v1.md

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+---
+# generated by https://github.com/hashicorp/terraform-plugin-docs
+page_title: "ec_container_image_v1 Data Source - terraform-provider-ec"
+subcategory: ""
+description: |-
+  Use this data source to access information about an existing Image.
+---
+
+# ec_container_image_v1 (Data Source)
+
+Use this data source to access information about an existing Image.
+
+
+
+<!-- schema generated by tfplugindocs -->
+## Schema
+
+### Optional
+
+- `instance` (String) Name is an instance name configured in the provider.
+- `metadata` (Block List, Max: 1) Image object metadata. (see [below for nested schema](#nestedblock--metadata))
+- `spec` (Block List, Max: 1) Spec defines the desired image. (see [below for nested schema](#nestedblock--spec))
+
+### Read-Only
+
+- `id` (String) The ID of this resource.
+
+<a id="nestedblock--metadata"></a>
+### Nested Schema for `metadata`
+
+Required:
+
+- `branch` (String) Branch defines the branch within which each name must be unique.
+
+Optional:
+
+- `object_meta` (Block List, Max: 1) (see [below for nested schema](#nestedblock--metadata--object_meta))
+
+<a id="nestedblock--metadata--object_meta"></a>
+### Nested Schema for `metadata.object_meta`
+
+Optional:
+
+- `annotations` (Map of String) An unstructured map of keys and values stored on an object.
+- `environment` (String) The name of the environment the object belongs to.
+- `labels` (Map of String) A map of keys and values that can be used to organize and categorize objects.
+- `name` (String) The unique object name within its scope.
+
+Read-Only:
+
+- `revision` (String) An opaque resource revision.
+- `uid` (String) A unique identifier for each an object.
+
+
+
+<a id="nestedblock--spec"></a>
+### Nested Schema for `spec`
+
+Required:
+
+- `image` (String) Image is the image name.
+
+Optional:
+
+- `tag` (String) Tag is the image tag.
+
+Read-Only:
+
+- `digest` (String) Digest is the hash of the image.
+- `registry` (String) Registry is the registry that contains the image.

ec/container/data_source_image.go

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+package container
+
+import (
+	"context"
+	"errors"
+	"slices"
+
+	"github.com/hashicorp/terraform-plugin-sdk/v2/diag"
+	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema"
+	"github.com/nitrado/terraform-provider-ec/ec"
+	"github.com/nitrado/terraform-provider-ec/pkg/resource"
+	apierrors "gitlab.com/nitrado/b2b/ec/apicore/api/errors"
+	metav1 "gitlab.com/nitrado/b2b/ec/apicore/apis/meta/v1"
+	containerv1 "gitlab.com/nitrado/b2b/ec/core/pkg/api/container/v1"
+)
+
+// DataSourceImage returns the data source resource for an image.
+func DataSourceImage() *schema.Resource {
+	return &schema.Resource{
+		Description: "Use this data source to access information about an existing Image.",
+		ReadContext: dataSourceImageRead,
+		Schema:      imageSchema(),
+	}
+}
+
+func dataSourceImageRead(ctx context.Context, d *schema.ResourceData, m any) diag.Diagnostics {
+	inst, _ := d.Get("instance").(string)
+	clientSet, err := ec.ResolveClientSet(m, inst)
+	if err != nil {
+		return diag.FromErr(err)
+	}
+
+	branch := d.Get("metadata.0.branch").(string)
+	name, hasName := d.GetOk("metadata.0.object_meta.0.name")
+	image, hasImage := d.GetOk("spec.0.image")
+	tag, hasTag := d.GetOk("spec.0.tag")
+
+	var obj *containerv1.Image
+	switch {
+	case hasName:
+		obj, err = clientSet.ContainerV1().Images(branch).Get(ctx, name.(string), metav1.GetOptions{})
+		if err != nil {
+			switch {
+			case apierrors.IsNotFound(err):
+				d.SetId("")
+				return nil
+			default:
+				return diag.FromErr(err)
+			}
+		}
+	case hasImage:
+		fieldSelector := map[string]string{
+			"spec.image": image.(string),
+		}
+		if hasTag {
+			fieldSelector["spec.tag"] = tag.(string)
+		}
+		list, err := clientSet.ContainerV1().Images(branch).List(ctx, metav1.ListOptions{FieldSelector: fieldSelector})
+		if err != nil {
+			return diag.FromErr(err)
+		}
+		if len(list.Items) == 0 {
+			d.SetId("")
+			return nil
+		}
+		latestImg := slices.MaxFunc(list.Items, func(a, b containerv1.Image) int {
+			switch {
+			case a.CreatedTimestamp.Before(b.CreatedTimestamp):
+				return -1
+			case a.CreatedTimestamp.Equal(b.CreatedTimestamp):
+				return 0
+			}
+			return 1
+		})
+		obj = &latestImg
+	default:
+		return diag.FromErr(errors.New("either metadata.0.name or spec.0.image is required"))
+	}
+
+	d.SetId(obj.Branch + "/" + obj.Name)
+
+	data, err := ec.Converter().Flatten(obj, imageSchema())
+	if err != nil {
+		return diag.FromErr(err)
+	}
+
+	if err = resource.SetData(d, data); err != nil {
+		return diag.FromErr(err)
+	}
+	return nil
+}

ec/container/data_source_image_test.go

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+package container_test
+
+import (
+	"testing"
+	"time"
+
+	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/resource"
+	"github.com/nitrado/terraform-provider-ec/ec/provider/providertest"
+	metav1 "gitlab.com/nitrado/b2b/ec/apicore/apis/meta/v1"
+	containerv1 "gitlab.com/nitrado/b2b/ec/core/pkg/api/container/v1"
+)
+
+func TestDataSourceImages(t *testing.T) {
+	img1 := &containerv1.Image{
+		ImageObjectMeta: containerv1.ImageObjectMeta{
+			ObjectMeta: metav1.ObjectMeta{
+				Name:             "my-image-1",
+				CreatedTimestamp: time.Now().Add(-1 * time.Hour),
+			},
+			Branch: "my-branch",
+		},
+		Spec: containerv1.ImageSpec{
+			Image: "my-image-name",
+			Tag:   "my-tag1",
+		},
+	}
+	img2 := &containerv1.Image{
+		ImageObjectMeta: containerv1.ImageObjectMeta{
+			ObjectMeta: metav1.ObjectMeta{
+				Name:             "my-image-2",
+				CreatedTimestamp: time.Now(),
+			},
+			Branch: "my-branch",
+		},
+		Spec: containerv1.ImageSpec{
+			Image: "my-image-name",
+			Tag:   "my-tag2",
+		},
+	}
+
+	pf, _ := providertest.SetupProviderFactories(t, img1, img2)
+
+	resource.Test(t, resource.TestCase{
+		IsUnitTest:        true,
+		ProviderFactories: pf,
+		Steps: []resource.TestStep{
+			{
+				Config: testDataSourceImageNameConfigRead(),
+				Check: resource.ComposeAggregateTestCheckFunc(
+					resource.TestCheckResourceAttr("data.ec_container_image.by_name", "metadata.0.object_meta.0.name", "my-image-1"),
+					resource.TestCheckResourceAttr("data.ec_container_image.by_name", "metadata.0.branch", "my-branch"),
+					resource.TestCheckResourceAttr("data.ec_container_image.by_name", "spec.#", "1"),
+					resource.TestCheckResourceAttr("data.ec_container_image.by_name", "spec.0.image", "my-image-name"),
+					resource.TestCheckResourceAttr("data.ec_container_image.by_name", "spec.0.tag", "my-tag1"),
+				),
+			},
+			{
+				Config: testDataSourceImageSpecConfigRead(),
+				Check: resource.ComposeAggregateTestCheckFunc(
+					resource.TestCheckResourceAttr("data.ec_container_image.by_image", "metadata.0.object_meta.0.name", "my-image-2"),
+					resource.TestCheckResourceAttr("data.ec_container_image.by_image", "metadata.0.branch", "my-branch"),
+					resource.TestCheckResourceAttr("data.ec_container_image.by_image", "spec.#", "1"),
+					resource.TestCheckResourceAttr("data.ec_container_image.by_image", "spec.0.image", "my-image-name"),
+					resource.TestCheckResourceAttr("data.ec_container_image.by_image", "spec.0.tag", "my-tag2"),
+				),
+			},
+		},
+	})
+}
+
+func testDataSourceImageNameConfigRead() string {
+	return `data "ec_container_image" "by_name" {
+  metadata {
+    object_meta {
+      name   = "my-image-1"
+    }
+    branch = "my-branch" 
+  }
+}
+`
+}
+
+func testDataSourceImageSpecConfigRead() string {
+	return `data "ec_container_image" "by_image" {
+  metadata {
+    branch = "my-branch" 
+  }
+  spec {
+    image = "my-image-name"
+  }
+}
+`
+}

ec/container/schema_image.go

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+package container
+
+import (
+	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema"
+	"github.com/nitrado/terraform-provider-ec/ec/meta"
+)
+
+// imageSchema is manually created, due to specific requirements.
+func imageSchema() map[string]*schema.Schema {
+	return map[string]*schema.Schema{
+		"instance": {
+			Type:        schema.TypeString,
+			Description: "Name is an instance name configured in the provider.",
+			Optional:    true,
+		},
+		"metadata": {
+			Type:        schema.TypeList,
+			Description: "Image object metadata.",
+			Optional:    true,
+			MaxItems:    1,
+			Elem: &schema.Resource{
+				Schema: map[string]*schema.Schema{
+					"branch": {
+						Type:        schema.TypeString,
+						Description: "Branch defines the branch within which each name must be unique.",
+						Required:    true,
+					},
+					"object_meta": {
+						Type:     schema.TypeList,
+						Optional: true,
+						MaxItems: 1,
+						Elem:     &schema.Resource{Schema: meta.Schema()},
+					},
+				},
+			},
+		},
+		"spec": {
+			Type:        schema.TypeList,
+			Description: "Spec defines the desired image.",
+			Optional:    true,
+			MaxItems:    1,
+			Elem: &schema.Resource{
+				Schema: map[string]*schema.Schema{
+					"digest": {
+						Type:        schema.TypeString,
+						Description: "Digest is the hash of the image.",
+						Computed:    true,
+					},
+					"image": {
+						Type:        schema.TypeString,
+						Description: "Image is the image name.",
+						Required:    true,
+					},
+					"registry": {
+						Type:        schema.TypeString,
+						Description: "Registry is the registry that contains the image.",
+						Computed:    true,
+					},
+					"tag": {
+						Type:        schema.TypeString,
+						Description: "Tag is the image tag.",
+						Optional:    true,
+						Computed:    true,
+					},
+				},
+			},
+		},
+	}
+}