From 5a6527dccf0e1ac8dc725336b4a16cf9ee58e187 Mon Sep 17 00:00:00 2001 From: justinsb Date: Wed, 22 Nov 2023 08:46:26 -0600 Subject: [PATCH] Simple kubectl plugin for plan functionality We would like to modularize kpt into composable functionality. Start with creating a kubectl plugin that can hold "plan" functionality. --- plugins/cmd/kubectl-plan/README.md | 7 + plugins/cmd/kubectl-plan/main.go | 21 ++ plugins/go.mod | 90 +++++ plugins/go.sum | 322 ++++++++++++++++++ plugins/pkg/cmd/plan/cluster_target.go | 107 ++++++ plugins/pkg/cmd/plan/golden_test.go | 123 +++++++ plugins/pkg/cmd/plan/loader.go | 87 +++++ plugins/pkg/cmd/plan/model.go | 29 ++ plugins/pkg/cmd/plan/plan.go | 121 +++++++ plugins/pkg/cmd/plan/planner.go | 108 ++++++ plugins/pkg/cmd/plan/printer.go | 25 ++ .../cmd/plan/testdata/simplecreate/apply.yaml | 7 + .../plan/testdata/simplecreate/existing.yaml | 0 .../cmd/plan/testdata/simplecreate/plan.yaml | 17 + .../plan/testdata/simplenochange/apply.yaml | 7 + .../testdata/simplenochange/existing.yaml | 7 + .../plan/testdata/simplenochange/plan.yaml | 17 + .../cmd/plan/testdata/simpleupdate/apply.yaml | 7 + .../plan/testdata/simpleupdate/existing.yaml | 7 + .../cmd/plan/testdata/simpleupdate/plan.yaml | 17 + 20 files changed, 1126 insertions(+) create mode 100644 plugins/cmd/kubectl-plan/README.md create mode 100644 plugins/cmd/kubectl-plan/main.go create mode 100644 plugins/go.mod create mode 100644 plugins/go.sum create mode 100644 plugins/pkg/cmd/plan/cluster_target.go create mode 100644 plugins/pkg/cmd/plan/golden_test.go create mode 100644 plugins/pkg/cmd/plan/loader.go create mode 100644 plugins/pkg/cmd/plan/model.go create mode 100644 plugins/pkg/cmd/plan/plan.go create mode 100644 plugins/pkg/cmd/plan/planner.go create mode 100644 plugins/pkg/cmd/plan/printer.go create mode 100644 plugins/pkg/cmd/plan/testdata/simplecreate/apply.yaml create mode 100644 plugins/pkg/cmd/plan/testdata/simplecreate/existing.yaml create mode 100644 plugins/pkg/cmd/plan/testdata/simplecreate/plan.yaml create mode 100644 plugins/pkg/cmd/plan/testdata/simplenochange/apply.yaml create mode 100644 plugins/pkg/cmd/plan/testdata/simplenochange/existing.yaml create mode 100644 plugins/pkg/cmd/plan/testdata/simplenochange/plan.yaml create mode 100644 plugins/pkg/cmd/plan/testdata/simpleupdate/apply.yaml create mode 100644 plugins/pkg/cmd/plan/testdata/simpleupdate/existing.yaml create mode 100644 plugins/pkg/cmd/plan/testdata/simpleupdate/plan.yaml diff --git a/plugins/cmd/kubectl-plan/README.md b/plugins/cmd/kubectl-plan/README.md new file mode 100644 index 0000000000..8d48541dd8 --- /dev/null +++ b/plugins/cmd/kubectl-plan/README.md @@ -0,0 +1,7 @@ +# kubectl-plan + +kubectl-plan is an experimental kubectl plugin that dry-runs +apply operations and shows the changes in an easy to read format. + +It is still under development and highly experimental, it should +not be treated as stable. \ No newline at end of file diff --git a/plugins/cmd/kubectl-plan/main.go b/plugins/cmd/kubectl-plan/main.go new file mode 100644 index 0000000000..522932cbf8 --- /dev/null +++ b/plugins/cmd/kubectl-plan/main.go @@ -0,0 +1,21 @@ +package main + +import ( + "context" + "fmt" + "os" + + "github.com/GoogleContainerTools/kpt/plugins/pkg/cmd/plan" +) + +func main() { + if err := Run(context.Background()); err != nil { + fmt.Fprintf(os.Stderr, "%v\n", err) + os.Exit(1) + } +} + +func Run(ctx context.Context) error { + root := plan.NewCommand() + return root.ExecuteContext(ctx) +} diff --git a/plugins/go.mod b/plugins/go.mod new file mode 100644 index 0000000000..bb44134234 --- /dev/null +++ b/plugins/go.mod @@ -0,0 +1,90 @@ +module github.com/GoogleContainerTools/kpt/plugins + +go 1.21.3 + +require ( + github.com/google/go-cmp v0.5.9 + github.com/spf13/cobra v1.8.0 + k8s.io/apimachinery v0.28.4 + k8s.io/client-go v0.28.4 + k8s.io/klog v1.0.0 + k8s.io/klog/v2 v2.100.1 + k8s.io/kubectl v0.28.4 + oras.land/oras-go v1.2.4 + sigs.k8s.io/kubebuilder-declarative-pattern v0.13.0 + sigs.k8s.io/kubebuilder-declarative-pattern/mockkubeapiserver v0.0.0-20231030230424-f6a5c89244f2 + sigs.k8s.io/kustomize/kyaml v0.15.0 +) + +require ( + github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 // indirect + github.com/MakeNowJust/heredoc v1.0.0 // indirect + github.com/Microsoft/hcsshim v0.11.0 // indirect + github.com/chai2010/gettext-go v1.0.2 // indirect + github.com/containerd/containerd v1.7.6 // indirect + github.com/davecgh/go-spew v1.1.1 // indirect + github.com/emicklei/go-restful/v3 v3.10.1 // indirect + github.com/evanphx/json-patch v4.12.0+incompatible // indirect + github.com/exponent-io/jsonpath v0.0.0-20151013193312-d6023ce2651d // indirect + github.com/go-errors/errors v1.4.2 // indirect + github.com/go-logr/logr v1.2.4 // indirect + github.com/go-openapi/jsonpointer v0.19.6 // indirect + github.com/go-openapi/jsonreference v0.20.2 // indirect + github.com/go-openapi/swag v0.22.3 // indirect + github.com/gogo/protobuf v1.3.2 // indirect + github.com/golang/protobuf v1.5.3 // indirect + github.com/google/btree v1.0.1 // indirect + github.com/google/gnostic-models v0.6.8 // indirect + github.com/google/gofuzz v1.2.0 // indirect + github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 // indirect + github.com/google/uuid v1.3.0 // indirect + github.com/gregjones/httpcache v0.0.0-20180305231024-9cad4c3443a7 // indirect + github.com/imdario/mergo v0.3.13 // indirect + github.com/inconshreveable/mousetrap v1.1.0 // indirect + github.com/josharian/intern v1.0.0 // indirect + github.com/json-iterator/go v1.1.12 // indirect + github.com/klauspost/compress v1.16.0 // indirect + github.com/liggitt/tabwriter v0.0.0-20181228230101-89fcab3d43de // indirect + github.com/mailru/easyjson v0.7.7 // indirect + github.com/mitchellh/go-wordwrap v1.0.1 // indirect + github.com/moby/spdystream v0.2.0 // indirect + github.com/moby/term v0.0.0-20221205130635-1aeaba878587 // indirect + github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect + github.com/modern-go/reflect2 v1.0.2 // indirect + github.com/monochromegane/go-gitignore v0.0.0-20200626010858-205db1a8cc00 // indirect + github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect + github.com/opencontainers/go-digest v1.0.0 // indirect + github.com/opencontainers/image-spec v1.1.0-rc5 // indirect + github.com/peterbourgon/diskv v2.0.1+incompatible // indirect + github.com/pkg/errors v0.9.1 // indirect + github.com/russross/blackfriday/v2 v2.1.0 // indirect + github.com/sirupsen/logrus v1.9.3 // indirect + github.com/spf13/pflag v1.0.5 // indirect + github.com/xlab/treeprint v1.2.0 // indirect + go.starlark.net v0.0.0-20230525235612-a134d8f9ddca // indirect + golang.org/x/net v0.17.0 // indirect + golang.org/x/oauth2 v0.8.0 // indirect + golang.org/x/sync v0.3.0 // indirect + golang.org/x/sys v0.13.0 // indirect + golang.org/x/term v0.13.0 // indirect + golang.org/x/text v0.13.0 // indirect + golang.org/x/time v0.3.0 // indirect + google.golang.org/appengine v1.6.7 // indirect + google.golang.org/genproto/googleapis/rpc v0.0.0-20230525234030-28d5490b6b19 // indirect + google.golang.org/grpc v1.56.3 // indirect + google.golang.org/protobuf v1.31.0 // indirect + gopkg.in/evanphx/json-patch.v5 v5.6.0 // indirect + gopkg.in/inf.v0 v0.9.1 // indirect + gopkg.in/yaml.v2 v2.4.0 // indirect + gopkg.in/yaml.v3 v3.0.1 // indirect + k8s.io/api v0.28.4 // indirect + k8s.io/cli-runtime v0.28.4 // indirect + k8s.io/component-base v0.28.4 // indirect + k8s.io/kube-openapi v0.0.0-20230717233707-2695361300d9 // indirect + k8s.io/utils v0.0.0-20230505201702-9f6742963106 // indirect + sigs.k8s.io/controller-runtime v0.13.0 // indirect + sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd // indirect + sigs.k8s.io/kustomize/api v0.15.0 // indirect + sigs.k8s.io/structured-merge-diff/v4 v4.2.3 // indirect + sigs.k8s.io/yaml v1.3.0 // indirect +) diff --git a/plugins/go.sum b/plugins/go.sum new file mode 100644 index 0000000000..69ef846048 --- /dev/null +++ b/plugins/go.sum @@ -0,0 +1,322 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 h1:UQHMgLO+TxOElx5B5HZ4hJQsoJ/PvUvKRhJHDQXO8P8= +github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1/go.mod h1:xomTg63KZ2rFqZQzSB4Vz2SUXa1BpHTVz9L5PTmPC4E= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/MakeNowJust/heredoc v1.0.0 h1:cXCdzVdstXyiTqTvfqk9SDHpKNjxuom+DOlyEeQ4pzQ= +github.com/MakeNowJust/heredoc v1.0.0/go.mod h1:mG5amYoWBHf8vpLOuehzbGGw0EHxpZZ6lCpQ4fNJ8LE= +github.com/Microsoft/hcsshim v0.11.0 h1:7EFNIY4igHEXUdj1zXgAyU3fLc7QfOKHbkldRVTBdiM= +github.com/Microsoft/hcsshim v0.11.0/go.mod h1:OEthFdQv/AD2RAdzR6Mm1N1KPCztGKDurW1Z8b8VGMM= +github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5 h1:0CwZNZbxp69SHPdPJAN/hZIm0C4OItdklCFmMRWYpio= +github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5/go.mod h1:wHh0iHkYZB8zMSxRWpUBQtwG5a7fFgvEO+odwuTv2gs= +github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU= +github.com/chai2010/gettext-go v1.0.2 h1:1Lwwip6Q2QGsAdl/ZKPCwTe9fe0CjlUbqj5bFNSjIRk= +github.com/chai2010/gettext-go v1.0.2/go.mod h1:y+wnP2cHYaVj19NZhYKAwEMH2CI1gNHeQQ+5AjwawxA= +github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI= +github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI= +github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU= +github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw= +github.com/containerd/containerd v1.7.6 h1:oNAVsnhPoy4BTPQivLgTzI9Oleml9l/+eYIDYXRCYo8= +github.com/containerd/containerd v1.7.6/go.mod h1:SY6lrkkuJT40BVNO37tlYTSnKJnP5AXBc0fhx0q+TJ4= +github.com/cpuguy83/go-md2man/v2 v2.0.3/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o= +github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E= +github.com/creack/pty v1.1.18 h1:n56/Zwd5o6whRC5PMGretI4IdRLlmBXYNjScPaBgsbY= +github.com/creack/pty v1.1.18/go.mod h1:MOBLtS5ELjhRRrroQr9kyvTxUAFNvYEK993ew/Vr4O4= +github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= +github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/emicklei/go-restful/v3 v3.10.1 h1:rc42Y5YTp7Am7CS630D7JmhRjq4UlEUuEKfrDac4bSQ= +github.com/emicklei/go-restful/v3 v3.10.1/go.mod h1:6n3XBCmQQb25CM2LCACGz8ukIrRry+4bhvbpWn3mrbc= +github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4= +github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c= +github.com/evanphx/json-patch v4.12.0+incompatible h1:4onqiflcdA9EOZ4RxV643DvftH5pOlLGNtQ5lPWQu84= +github.com/evanphx/json-patch v4.12.0+incompatible/go.mod h1:50XU6AFN0ol/bzJsmQLiYLvXMP4fmwYFNcr97nuDLSk= +github.com/exponent-io/jsonpath v0.0.0-20151013193312-d6023ce2651d h1:105gxyaGwCFad8crR9dcMQWvV9Hvulu6hwUh4tWPJnM= +github.com/exponent-io/jsonpath v0.0.0-20151013193312-d6023ce2651d/go.mod h1:ZZMPRZwes7CROmyNKgQzC3XPs6L/G2EJLHddWejkmf4= +github.com/fsnotify/fsnotify v1.6.0 h1:n+5WquG0fcWoWp6xPWfHdbskMCQaFnG6PfBrh1Ky4HY= +github.com/fsnotify/fsnotify v1.6.0/go.mod h1:sl3t1tCWJFWoRz9R8WJCbQihKKwmorjAbSClcnxKAGw= +github.com/go-errors/errors v1.4.2 h1:J6MZopCL4uSllY1OfXM374weqZFFItUbrImctkmUxIA= +github.com/go-errors/errors v1.4.2/go.mod h1:sIVyrIiJhuEF+Pj9Ebtd6P/rEYROXFi3BopGUQ5a5Og= +github.com/go-logr/logr v0.1.0/go.mod h1:ixOQHD9gLJUVQQ2ZOR7zLEifBX6tGkNJF4QyIY7sIas= +github.com/go-logr/logr v1.2.0/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A= +github.com/go-logr/logr v1.2.4 h1:g01GSCwiDw2xSZfjJ2/T9M+S6pFdcNtFYsp+Y43HYDQ= 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h1:GeOyir5tyXNByN85N/dRIT9es5UQNerPYEKK56eTBm8= diff --git a/plugins/pkg/cmd/plan/cluster_target.go b/plugins/pkg/cmd/plan/cluster_target.go new file mode 100644 index 0000000000..8f68d692ef --- /dev/null +++ b/plugins/pkg/cmd/plan/cluster_target.go @@ -0,0 +1,107 @@ +package plan + +import ( + "context" + "encoding/json" + "fmt" + + "k8s.io/apimachinery/pkg/api/meta" + metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" + "k8s.io/apimachinery/pkg/apis/meta/v1/unstructured" + "k8s.io/apimachinery/pkg/runtime/schema" + "k8s.io/apimachinery/pkg/types" + "k8s.io/client-go/dynamic" + "k8s.io/client-go/rest" + "sigs.k8s.io/kubebuilder-declarative-pattern/pkg/restmapper" +) + +// ClusterTarget supports actions against a running kubernetes cluster. +type ClusterTarget struct { + client dynamic.Interface + restMapper resourceFinder +} + +func NewClusterTarget(restConfig *rest.Config) (*ClusterTarget, error) { + client, err := dynamic.NewForConfig(restConfig) + if err != nil { + return nil, fmt.Errorf("creating kubernetes client: %w", err) + } + + restMapper, err := restmapper.NewControllerRESTMapper(restConfig) + if err != nil { + return nil, fmt.Errorf("building REST mapper: %w", err) + } + + return &ClusterTarget{ + client: client, + restMapper: restMapper, + }, nil +} + +type resourceFinder interface { + RESTMapping(gk schema.GroupKind, versions ...string) (*meta.RESTMapping, error) +} + +// ResourceForGVK gets the GVR / Scope for the specified object. +func (c *ClusterTarget) ResourceForGVK(ctx context.Context, gvk schema.GroupVersionKind) (*clusterResourceTarget, error) { + mapping, err := c.restMapper.RESTMapping(gvk.GroupKind(), gvk.Version) + if err != nil { + return nil, fmt.Errorf("cannot get RESTMapping for %v: %w", gvk, err) + } + return &clusterResourceTarget{info: mapping, client: c.client}, nil +} + +// Apply is a wrapper around applying changes to a live cluster. +func (c *clusterResourceTarget) Apply(ctx context.Context, obj *unstructured.Unstructured, options metav1.PatchOptions) (*unstructured.Unstructured, error) { + target, err := c.buildResource(ctx, obj) + if err != nil { + return nil, err + } + + j, err := json.Marshal(obj) + if err != nil { + return nil, fmt.Errorf("error marshalling object to JSON: %w", err) + } + + // Apply with server-side apply (specified with ApplyPatchType) + patched, err := target.Patch(ctx, obj.GetName(), types.ApplyPatchType, j, options) + if err != nil { + return nil, fmt.Errorf("server-side-apply failed: %w", err) + } + + return patched, nil +} + +// buildResource creates the dynamic ResourceInterface for the object +func (c *clusterResourceTarget) buildResource(ctx context.Context, obj *unstructured.Unstructured) (dynamic.ResourceInterface, error) { + if c.info.Scope == meta.RESTScopeRoot { + return c.client.Resource(c.info.Resource), nil + } else { + namespace := obj.GetNamespace() + if namespace == "" { + return nil, fmt.Errorf("namespace was not set, but is required for namespace-scoped objects") + } + return c.client.Resource(c.info.Resource).Namespace(namespace), nil + } +} + +// Get reads the current version of an object. +func (c *clusterResourceTarget) Get(ctx context.Context, obj *unstructured.Unstructured, options metav1.GetOptions) (*unstructured.Unstructured, error) { + target, err := c.buildResource(ctx, obj) + if err != nil { + return nil, err + } + + existing, err := target.Get(ctx, obj.GetName(), options) + if err != nil { + return nil, fmt.Errorf("get failed: %w", err) + } + + return existing, nil +} + +type clusterResourceTarget struct { + info *meta.RESTMapping + + client dynamic.Interface +} diff --git a/plugins/pkg/cmd/plan/golden_test.go b/plugins/pkg/cmd/plan/golden_test.go new file mode 100644 index 0000000000..b81b034a8e --- /dev/null +++ b/plugins/pkg/cmd/plan/golden_test.go @@ -0,0 +1,123 @@ +package plan + +import ( + "bytes" + "context" + "encoding/json" + "os" + "path/filepath" + "testing" + + "github.com/google/go-cmp/cmp" + "k8s.io/client-go/rest" + "k8s.io/klog/v2" + "sigs.k8s.io/kubebuilder-declarative-pattern/mockkubeapiserver" + "sigs.k8s.io/kustomize/kyaml/yaml" +) + +func TestPlanner(t *testing.T) { + k8s, err := mockkubeapiserver.NewMockKubeAPIServer(":0") + if err != nil { + t.Fatalf("error building mock kube-apiserver: %v", err) + } + defer func() { + if err := k8s.Stop(); err != nil { + t.Fatalf("error closing mock kube-apiserver: %v", err) + } + }() + addr, err := k8s.StartServing() + if err != nil { + t.Errorf("error starting mock kube-apiserver: %v", err) + } + klog.Infof("mock kubeapiserver will listen on %v", addr) + + restConfig := &rest.Config{ + Host: addr.String(), + } + + dir := "testdata" + files, err := os.ReadDir(dir) + if err != nil { + t.Fatalf("failed to read directory %q: %v", dir, err) + } + for _, file := range files { + p := filepath.Join(dir, file.Name()) + if !file.IsDir() { + t.Errorf("found non-directory %q", p) + continue + } + + t.Run(file.Name(), func(t *testing.T) { + p := filepath.Join(dir, file.Name()) + + ctx := context.Background() + + objects, err := loadObjectsFromFilesystem(filepath.Join(p, "apply.yaml")) + if err != nil { + t.Fatalf("error loading objects: %v", err) + } + + target, err := NewClusterTarget(restConfig) + if err != nil { + t.Fatalf("error building target: %v", err) + } + + planner := &Planner{} + + plan, err := planner.BuildPlan(ctx, objects, target) + if err != nil { + t.Fatalf("error from BuildPlan: %v", err) + } + + actual, err := yamlMarshal(plan) + if err != nil { + t.Fatalf("yaml.Marshal failed: %v", err) + } + CompareGoldenFile(t, filepath.Join(p, "plan.yaml"), actual) + }) + } +} + +func yamlMarshal(o interface{}) ([]byte, error) { + b, err := json.Marshal(o) + if err != nil { + return nil, err + } + + var jsonObj interface{} + if err := yaml.Unmarshal(b, &jsonObj); err != nil { + return nil, err + } + + var bb bytes.Buffer + encoder := yaml.NewEncoder(&bb) + + if err := encoder.Encode(jsonObj); err != nil { + return nil, err + } + + return bb.Bytes(), nil +} + +func CompareGoldenFile(t *testing.T, p string, got []byte) { + if os.Getenv("WRITE_GOLDEN_OUTPUT") != "" { + // Short-circuit when the output is correct + b, err := os.ReadFile(p) + if err == nil && bytes.Equal(b, got) { + return + } + + if err := os.WriteFile(p, got, 0644); err != nil { + t.Fatalf("failed to write golden output %s: %v", p, err) + } + t.Errorf("wrote output to %s", p) + } else { + want, err := os.ReadFile(p) + if err != nil { + t.Fatalf("failed to read file %q: %v", p, err) + } + if diff := cmp.Diff(string(want), string(got)); diff != "" { + t.Errorf("unexpected diff in %s: %s", p, diff) + } + } +} diff --git a/plugins/pkg/cmd/plan/loader.go b/plugins/pkg/cmd/plan/loader.go new file mode 100644 index 0000000000..c427005936 --- /dev/null +++ b/plugins/pkg/cmd/plan/loader.go @@ -0,0 +1,87 @@ +package plan + +import ( + "bufio" + "bytes" + "fmt" + "io" + "os" + "path/filepath" + + "k8s.io/apimachinery/pkg/apis/meta/v1/unstructured" + "k8s.io/apimachinery/pkg/runtime/serializer/yaml" +) + +// loadObjectsFromFilesystem parses yaml objects from the provided directory or file path. +func loadObjectsFromFilesystem(p string) ([]*unstructured.Unstructured, error) { + var objects []*unstructured.Unstructured + stat, err := os.Stat(p) + if err != nil { + return nil, fmt.Errorf("could not get filesystem info for %q: %w", p, err) + } + + if stat.IsDir() { + files, err := os.ReadDir(p) + if err != nil { + return nil, fmt.Errorf("could not read directory %q: %w", p, err) + } + for _, f := range files { + childP := filepath.Join(p, f.Name()) + childObjects, err := loadObjectsFromFilesystem(childP) + if err != nil { + return nil, err + } + objects = append(objects, childObjects...) + } + return objects, nil + } + + f, err := os.Open(p) + if err != nil { + return nil, fmt.Errorf("error opening %q: %w", p, err) + } + defer f.Close() + objs, err := parseObjects(f) + if err != nil { + return nil, fmt.Errorf("error reading objects: %w", err) + } + return objs, nil +} + +// parseObjects parses yaml objects from the provided reader. +func parseObjects(r io.Reader) ([]*unstructured.Unstructured, error) { + codec := yaml.NewDecodingSerializer(unstructured.UnstructuredJSONScheme) + + var objs []*unstructured.Unstructured + + scanner := bufio.NewScanner(r) + scanner.Split(scanYAML) + + for scanner.Scan() { + b := scanner.Bytes() + obj, _, err := codec.Decode(b, nil, &unstructured.Unstructured{}) + if err != nil { + return nil, err + } + objs = append(objs, obj.(*unstructured.Unstructured)) + } + + return objs, nil +} + +// scanYAML is a split function for a Scanner that returns each yaml object. +func scanYAML(data []byte, atEOF bool) (advance int, token []byte, err error) { + if atEOF && len(data) == 0 { + return 0, nil, nil + } + if i := bytes.Index(data, []byte("\n---\n")); i >= 0 { + // We have a full object. + return i + 1, data[0:i], nil + } + // If we're at EOF, we have a final, non-terminated object. Return it. + if atEOF { + return len(data), data, nil + } + // Request more data. + return 0, nil, nil +} diff --git a/plugins/pkg/cmd/plan/model.go b/plugins/pkg/cmd/plan/model.go new file mode 100644 index 0000000000..f966efaf64 --- /dev/null +++ b/plugins/pkg/cmd/plan/model.go @@ -0,0 +1,29 @@ +package plan + +import "k8s.io/apimachinery/pkg/apis/meta/v1/unstructured" + +// Plan stores the expected changes when applying changes to a cluster. +// For consistency, we represent it as a KRM object, but we don't expect it to be applied to a cluster. +type Plan struct { + metav1.TypeMeta + + Spec PlanSpec `json:"spec,omitempty"` +} + +// PlanSpec is the Spec for a Plan object. +type PlanSpec struct { + Actions []Action `json:"actions,omitempty"` +} + +// ActionType is an enum type for the type of change (no-change/create/update etc). +type ActionType string + +// Action represents an individual object change. +type Action struct { + Type ActionType `json:"action,omitempty"` + APIVersion string `json:"apiVersion,omitempty"` + Kind string `json:"kind,omitempty"` + Name string `json:"name,omitempty"` + Namespace string `json:"namespace,omitempty"` + Object *unstructured.Unstructured `json:"object,omitempty"` +} diff --git a/plugins/pkg/cmd/plan/plan.go b/plugins/pkg/cmd/plan/plan.go new file mode 100644 index 0000000000..2beb484cb7 --- /dev/null +++ b/plugins/pkg/cmd/plan/plan.go @@ -0,0 +1,121 @@ +// Copyright 2021 Google LLC +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +package plan + +import ( + "context" + "fmt" + "io" + + "github.com/spf13/cobra" + "k8s.io/apimachinery/pkg/apis/meta/v1/unstructured" + "k8s.io/client-go/rest" + "sigs.k8s.io/controller-runtime/pkg/client/config" +) + +// NewCommand builds a cobra command for the plan operation. +func NewCommand() *cobra.Command { + opt := &PlanOptions{} + + cmd := &cobra.Command{ + Use: "plan [DIR]...", + // Short: + // Long: + // Example: + PreRunE: func(cmd *cobra.Command, args []string) error { + ctx := cmd.Context() + + objects, err := readObjects(ctx, cmd, args) + if err != nil { + return err + } + opt.Objects = objects + + opt.Out = cmd.OutOrStdout() + return nil + }, + RunE: func(cmd *cobra.Command, args []string) error { + restConfig, err := buildRESTConfig() + if err != nil { + return err + } + opt.RESTConfig = restConfig + + return RunPlan(cmd.Context(), opt) + }, + } + + return cmd +} + +// buildRESTConfig gets the kube config (rest.Config) for the current kubernetes cluster. +func buildRESTConfig() (*rest.Config, error) { + restConfig, err := config.GetConfig() + if err != nil { + return nil, fmt.Errorf("getting kubeconfig: %w", err) + } + return restConfig, nil +} + +// readObjects reads objects from the arguments supplied on the command line +func readObjects(ctx context.Context, cmd *cobra.Command, args []string) ([]*unstructured.Unstructured, error) { + if len(args) == 0 { + return nil, fmt.Errorf("must pass file or - (for stdin) with objects to apply") + } + if len(args) != 1 { + return nil, fmt.Errorf("expected exactly 1 arg, got %d", len(args)) + } + + if args[0] == "-" { + objs, err := parseObjects(cmd.InOrStdin()) + if err != nil { + return nil, fmt.Errorf("error reading objects: %w", err) + } + return objs, nil + } else { + return loadObjectsFromFilesystem(args[0]) + } +} + +// PlanOptions holds options for a plan operation. +type PlanOptions struct { + Out io.Writer + Objects []*unstructured.Unstructured + + RESTConfig *rest.Config +} + +// RunPlan executes a plan operation. +func RunPlan(ctx context.Context, opt *PlanOptions) error { + target, err := buildTarget(ctx, opt.RESTConfig) + if err != nil { + return err + } + + p := &Planner{} + + plan, err := p.BuildPlan(ctx, opt.Objects, target) + if err != nil { + return err + } + + printPlan(ctx, plan, opt.Out) + + return nil +} + +func buildTarget(ctx context.Context, restConfig *rest.Config) (*ClusterTarget, error) { + return NewClusterTarget(restConfig) +} diff --git a/plugins/pkg/cmd/plan/planner.go b/plugins/pkg/cmd/plan/planner.go new file mode 100644 index 0000000000..5bb3e939d8 --- /dev/null +++ b/plugins/pkg/cmd/plan/planner.go @@ -0,0 +1,108 @@ +package plan + +import ( + "context" + "errors" + "fmt" + "reflect" + + "github.com/google/go-cmp/cmp" + apierrors "k8s.io/apimachinery/pkg/api/errors" + metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" + "k8s.io/apimachinery/pkg/apis/meta/v1/unstructured" + "k8s.io/klog/v2" +) + +// Planner holds the core planning logic and state. +type Planner struct { +} + +// BuildPlan is the entry point for building a plan. +func (r *Planner) BuildPlan(ctx context.Context, objects []*unstructured.Unstructured, target *ClusterTarget) (*Plan, error) { + plan := &Plan{} + + plan.APIVersion = "plan.kpt.dev/v1alpha1" + plan.Kind = "Plan" + + // TODO: prefetch & invalidate REST Mappings here, so we know they are valid later? + + force := true + applyOptions := metav1.PatchOptions{ + FieldManager: "kpt/plan", + Force: &force, + DryRun: []string{"All"}, + } + + for _, object := range objects { + gvk := object.GroupVersionKind() + + var action Action + action.Namespace = object.GetNamespace() + action.Name = object.GetName() + action.Kind = gvk.Kind + action.APIVersion = object.GetAPIVersion() + action.Object = object + + id := gvk.Kind + ":" + action.Namespace + "/" + action.Name + + resource, err := target.ResourceForGVK(ctx, gvk) + if err != nil { + // The Kind doesn't even exist; the object can't exist already + // TODO: We should invalide mappings above, in case our cache is out of date + action.Type = "Create" + plan.Spec.Actions = append(plan.Spec.Actions, action) + continue + } + + beforeApply, err := resource.Get(ctx, object, metav1.GetOptions{}) + if err != nil { + if apierrors.IsNotFound(unwrap(err)) { + action.Type = "Create" + plan.Spec.Actions = append(plan.Spec.Actions, action) + continue + } + return nil, fmt.Errorf("failed to read object %s: %w", id, err) + } + + klog.V(5).Infof("applying %s...", id) + afterApply, err := resource.Apply(ctx, object, applyOptions) + if err == nil { + klog.V(4).Infof("applied OK %s", id) + + // Ignore changes in managed fields, since they are not relevant to the user + beforeApply.SetManagedFields(nil) + afterApply.SetManagedFields(nil) + + if reflect.DeepEqual(beforeApply, afterApply) { + action.Type = "Unchanged" + plan.Spec.Actions = append(plan.Spec.Actions, action) + } else { + diff := cmp.Diff(beforeApply, afterApply) + if diff != "" { + klog.Infof("diff is %v", diff) + } + action.Type = "ApplyChanges" + plan.Spec.Actions = append(plan.Spec.Actions, action) + } + } + + if err != nil { + if action.Type == "" { + klog.Errorf("unknown error applying (%s) %#v", id, err) + action.Type = "Error" + } + plan.Spec.Actions = append(plan.Spec.Actions, action) + continue + } + } + + return plan, nil +} + +func unwrap(err error) error { + var apiStatusError *apierrors.StatusError + if errors.As(err, &apiStatusError) { + return apiStatusError + } + return err +} diff --git a/plugins/pkg/cmd/plan/printer.go b/plugins/pkg/cmd/plan/printer.go new file mode 100644 index 0000000000..1c01fc80c0 --- /dev/null +++ b/plugins/pkg/cmd/plan/printer.go @@ -0,0 +1,25 @@ +package plan + +import ( + "context" + "fmt" + "io" + "text/tabwriter" +) + +// printPlan writes a plan to out for human consumption (usually will be stdout) +func printPlan(ctx context.Context, plan *Plan, out io.Writer) error { + minwidth := 0 + tabwidth := 4 + padding := 1 + padchar := byte(' ') + flags := uint(0) //tabwriter.AlignRight | tabwriter.Debug + w := tabwriter.NewWriter(out, minwidth, tabwidth, padding, padchar, flags) + fmt.Fprintf(w, "%s\t%s\t%s\t%s\t\n", "ACTION", "KIND", "NAMESPACE", "NAME") + for _, action := range plan.Spec.Actions { + fmt.Fprintf(w, "%s\t%s\t%s\t%s\t\n", action.Type, action.Kind, action.Namespace, action.Name) + } + w.Flush() + + return nil +} diff --git a/plugins/pkg/cmd/plan/testdata/simplecreate/apply.yaml b/plugins/pkg/cmd/plan/testdata/simplecreate/apply.yaml new file mode 100644 index 0000000000..a979277bf1 --- /dev/null +++ b/plugins/pkg/cmd/plan/testdata/simplecreate/apply.yaml @@ -0,0 +1,7 @@ +apiVersion: v1 +kind: ConfigMap +metadata: + namespace: default + name: cm1 +data: + foo: bar diff --git a/plugins/pkg/cmd/plan/testdata/simplecreate/existing.yaml b/plugins/pkg/cmd/plan/testdata/simplecreate/existing.yaml new file mode 100644 index 0000000000..e69de29bb2 diff --git a/plugins/pkg/cmd/plan/testdata/simplecreate/plan.yaml b/plugins/pkg/cmd/plan/testdata/simplecreate/plan.yaml new file mode 100644 index 0000000000..e72ee6bb5c --- /dev/null +++ b/plugins/pkg/cmd/plan/testdata/simplecreate/plan.yaml @@ -0,0 +1,17 @@ +apiVersion: plan.kpt.dev/v1alpha1 +kind: Plan +spec: + actions: + - action: Create + apiVersion: v1 + kind: ConfigMap + name: cm1 + namespace: default + object: + apiVersion: v1 + data: + foo: bar + kind: ConfigMap + metadata: + name: cm1 + namespace: default diff --git a/plugins/pkg/cmd/plan/testdata/simplenochange/apply.yaml b/plugins/pkg/cmd/plan/testdata/simplenochange/apply.yaml new file mode 100644 index 0000000000..a979277bf1 --- /dev/null +++ b/plugins/pkg/cmd/plan/testdata/simplenochange/apply.yaml @@ -0,0 +1,7 @@ +apiVersion: v1 +kind: ConfigMap +metadata: + namespace: default + name: cm1 +data: + foo: bar diff --git a/plugins/pkg/cmd/plan/testdata/simplenochange/existing.yaml b/plugins/pkg/cmd/plan/testdata/simplenochange/existing.yaml new file mode 100644 index 0000000000..a979277bf1 --- /dev/null +++ b/plugins/pkg/cmd/plan/testdata/simplenochange/existing.yaml @@ -0,0 +1,7 @@ +apiVersion: v1 +kind: ConfigMap +metadata: + namespace: default + name: cm1 +data: + foo: bar diff --git a/plugins/pkg/cmd/plan/testdata/simplenochange/plan.yaml b/plugins/pkg/cmd/plan/testdata/simplenochange/plan.yaml new file mode 100644 index 0000000000..e72ee6bb5c --- /dev/null +++ b/plugins/pkg/cmd/plan/testdata/simplenochange/plan.yaml @@ -0,0 +1,17 @@ +apiVersion: plan.kpt.dev/v1alpha1 +kind: Plan +spec: + actions: + - action: Create + apiVersion: v1 + kind: ConfigMap + name: cm1 + namespace: default + object: + apiVersion: v1 + data: + foo: bar + kind: ConfigMap + metadata: + name: cm1 + namespace: default diff --git a/plugins/pkg/cmd/plan/testdata/simpleupdate/apply.yaml b/plugins/pkg/cmd/plan/testdata/simpleupdate/apply.yaml new file mode 100644 index 0000000000..a87cbf0d9c --- /dev/null +++ b/plugins/pkg/cmd/plan/testdata/simpleupdate/apply.yaml @@ -0,0 +1,7 @@ +apiVersion: v1 +kind: ConfigMap +metadata: + namespace: default + name: cm1 +data: + foo: bar2 diff --git a/plugins/pkg/cmd/plan/testdata/simpleupdate/existing.yaml b/plugins/pkg/cmd/plan/testdata/simpleupdate/existing.yaml new file mode 100644 index 0000000000..7069357586 --- /dev/null +++ b/plugins/pkg/cmd/plan/testdata/simpleupdate/existing.yaml @@ -0,0 +1,7 @@ +apiVersion: v1 +kind: ConfigMap +metadata: + namespace: default + name: cm1 +data: + foo: bar1 diff --git a/plugins/pkg/cmd/plan/testdata/simpleupdate/plan.yaml b/plugins/pkg/cmd/plan/testdata/simpleupdate/plan.yaml new file mode 100644 index 0000000000..e72ee6bb5c --- /dev/null +++ b/plugins/pkg/cmd/plan/testdata/simpleupdate/plan.yaml @@ -0,0 +1,17 @@ +apiVersion: plan.kpt.dev/v1alpha1 +kind: Plan +spec: + actions: + - action: Create + apiVersion: v1 + kind: ConfigMap + name: cm1 + namespace: default + object: + apiVersion: v1 + data: + foo: bar + kind: ConfigMap + metadata: + name: cm1 + namespace: default