feat: add uninstall command to the controller

cmds/ocm/commands/controllercmds/install/apply.go → cmds/ocm/commands/controllercmds/common/applyer.go

@@ -2,7 +2,7 @@
 //
 // SPDX-License-Identifier: Apache-2.0
 
-package install
+package common
 
 import (
 	"bufio"
@@ -20,7 +20,7 @@ import (
 	"sigs.k8s.io/controller-runtime/pkg/client"
 )
 
-func readObjects(manifestPath string) ([]*unstructured.Unstructured, error) {
+func ReadObjects(manifestPath string) ([]*unstructured.Unstructured, error) {
 	fi, err := os.Lstat(manifestPath)
 	if err != nil {
 		return nil, err

cmds/ocm/commands/controllercmds/common/fetcher.go

@@ -0,0 +1,107 @@
+// SPDX-FileCopyrightText: 2022 SAP SE or an SAP affiliate company and Open Component Model contributors.
+//
+// SPDX-License-Identifier: Apache-2.0
+
+package common
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+func getLatestVersion(ctx context.Context, url string) (string, error) {
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url+"/latest", nil)
+	if err != nil {
+		return "", err
+	}
+
+	res, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return "", fmt.Errorf("GitHub API call failed: %w", err)
+	}
+
+	if res.Body != nil {
+		defer res.Body.Close()
+	}
+
+	type meta struct {
+		Tag string `json:"tag_name"`
+	}
+	var m meta
+	if err := json.NewDecoder(res.Body).Decode(&m); err != nil {
+		return "", fmt.Errorf("decoding GitHub API response failed: %w", err)
+	}
+
+	return m.Tag, err
+}
+
+// existingVersion calls the GitHub API to confirm the given version does exist.
+func existingVersion(ctx context.Context, url, version string) (bool, error) {
+	if !strings.HasPrefix(version, "v") {
+		version = "v" + version
+	}
+
+	ghURL := fmt.Sprintf(url+"/tags/%s", version)
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, ghURL, nil)
+	if err != nil {
+		return false, fmt.Errorf("GitHub API call failed: %w", err)
+	}
+
+	res, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return false, err
+	}
+
+	if res.Body != nil {
+		defer res.Body.Close()
+	}
+
+	switch res.StatusCode {
+	case http.StatusOK:
+		return true, nil
+	case http.StatusNotFound:
+		return false, nil
+	default:
+		return false, fmt.Errorf("GitHub API returned an unexpected status code (%d)", res.StatusCode)
+	}
+}
+
+func fetch(ctx context.Context, url, version, dir, filename string) error {
+	ghURL := fmt.Sprintf("%s/latest/download/%s", url, filename)
+	if strings.HasPrefix(version, "v") {
+		ghURL = fmt.Sprintf("%s/download/%s/%s", url, version, filename)
+	}
+
+	req, err := http.NewRequest(http.MethodGet, ghURL, nil)
+	if err != nil {
+		return fmt.Errorf("failed to create HTTP request for %s, error: %w", ghURL, err)
+	}
+
+	resp, err := http.DefaultClient.Do(req.WithContext(ctx))
+	if err != nil {
+		return fmt.Errorf("failed to download manifests.tar.gz from %s, error: %w", ghURL, err)
+	}
+	defer resp.Body.Close()
+
+	// check response
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("failed to download %s from %s, status: %s", filename, ghURL, resp.Status)
+	}
+
+	wf, err := os.OpenFile(filepath.Join(dir, filename), os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0o777)
+	if err != nil {
+		return fmt.Errorf("failed to open temp file: %w", err)
+	}
+
+	if _, err := io.Copy(wf, resp.Body); err != nil {
+		return fmt.Errorf("failed to write to temp file: %w", err)
+	}
+
+	return nil
+}

cmds/ocm/commands/controllercmds/common/manifests.go

@@ -0,0 +1,115 @@
+// SPDX-FileCopyrightText: 2022 SAP SE or an SAP affiliate company and Open Component Model contributors.
+//
+// SPDX-License-Identifier: Apache-2.0
+
+package common
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/fluxcd/pkg/ssa"
+	"github.com/open-component-model/ocm/pkg/contexts/clictx"
+	"github.com/open-component-model/ocm/pkg/out"
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+)
+
+func Install(ctx context.Context, octx clictx.Context, sm *ssa.ResourceManager, releaseURL, baseURL, manifest, filename, version string, dryRun bool) error {
+	objects, err := fetchObjects(ctx, octx, releaseURL, baseURL, manifest, filename, version, dryRun)
+	if err != nil {
+		return fmt.Errorf("✗ failed to construct objects to apply: %w", err)
+	}
+
+	// dry run was set to true, no objects are returned
+	if len(objects) == 0 {
+		return nil
+	}
+
+	if _, err := sm.ApplyAllStaged(context.Background(), objects, ssa.DefaultApplyOptions()); err != nil {
+		return fmt.Errorf("✗ failed to apply manifests: %w", err)
+	}
+
+	out.Outf(octx, "► waiting for ocm deployment to be ready\n")
+	if err = sm.Wait(objects, ssa.DefaultWaitOptions()); err != nil {
+		return fmt.Errorf("✗ failed to wait for objects to be ready: %w", err)
+	}
+
+	return nil
+}
+
+func Uninstall(ctx context.Context, octx clictx.Context, sm *ssa.ResourceManager, releaseURL, baseURL, manifest, filename, version string, dryRun bool) error {
+	objects, err := fetchObjects(ctx, octx, releaseURL, baseURL, manifest, filename, version, dryRun)
+	if err != nil {
+		return fmt.Errorf("✗ failed to construct objects to apply: %w", err)
+	}
+
+	// dry run was set to true, no objects are returned
+	if len(objects) == 0 {
+		return nil
+	}
+
+	if _, err := sm.DeleteAll(context.Background(), objects, ssa.DefaultDeleteOptions()); err != nil {
+		return fmt.Errorf("✗ failed to delete manifests: %w", err)
+	}
+
+	out.Outf(octx, "► waiting for ocm deployment to be deleted\n")
+	if err = sm.WaitForTermination(objects, ssa.DefaultWaitOptions()); err != nil {
+		return fmt.Errorf("✗ failed to wait for objects to be deleted: %w", err)
+	}
+
+	return nil
+}
+
+func fetchObjects(ctx context.Context, octx clictx.Context, releaseURL, baseURL, manifest, filename, version string, dryRun bool) ([]*unstructured.Unstructured, error) {
+	if version == "latest" {
+		latest, err := getLatestVersion(ctx, releaseURL)
+		if err != nil {
+			return nil, fmt.Errorf("✗ failed to retrieve latest version for %s: %w", manifest, err)
+		}
+		out.Outf(octx, "► got latest version %q\n", latest)
+		version = latest
+	} else {
+		exists, err := existingVersion(ctx, releaseURL, version)
+		if err != nil {
+			return nil, fmt.Errorf("✗ failed to check if version exists: %w", err)
+		}
+		if !exists {
+			return nil, fmt.Errorf("✗ version %q does not exist", version)
+		}
+	}
+
+	temp, err := os.MkdirTemp("", manifest+"-download")
+	if err != nil {
+		return nil, fmt.Errorf("✗ failed to create temp folder: %w", err)
+	}
+	defer os.RemoveAll(temp)
+
+	if err := fetch(ctx, baseURL, version, temp, filename); err != nil {
+		return nil, fmt.Errorf("✗ failed to download install.yaml file: %w", err)
+	}
+
+	path := filepath.Join(temp, filename)
+	if _, err := os.Stat(path); os.IsNotExist(err) {
+		return nil, fmt.Errorf("✗ failed to find %s file at location: %w", filename, err)
+	}
+	out.Outf(octx, "✔ successfully fetched install file\n")
+	if dryRun {
+		content, err := os.ReadFile(path)
+		if err != nil {
+			return nil, fmt.Errorf("✗ failed to read %s file at location: %w", filename, err)
+		}
+
+		out.Outf(octx, string(content))
+		return nil, nil
+	}
+	out.Outf(octx, "► applying to cluster...\n")
+
+	objects, err := ReadObjects(path)
+	if err != nil {
+		return nil, fmt.Errorf("✗ failed to construct objects to apply: %w", err)
+	}
+
+	return objects, nil
+}