refactor cli

Dockerfile

@@ -35,9 +35,7 @@ RUN GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build \
       -ldflags "-w -X ${VERSION_PACKAGE}.version=${VERSION} -X ${VERSION_PACKAGE}.buildDate=$(date -u +'%Y-%m-%dT%H:%M:%SZ') -X ${VERSION_PACKAGE}.gitCommit=${GIT_COMMIT} -X ${VERSION_PACKAGE}.gitTreeState=${GIT_TREE_STATE}" \
       -o bin/kargo-render \
       ./cmd \
-    && bin/kargo-render version \
-    && cd bin \
-    && ln -s kargo-render kargo-render-action
+    && bin/kargo-render version
 
 FROM alpine:3.19.1 as final
 

cmd/action_cmd.go

@@ -0,0 +1,107 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"io"
+
+	log "github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+
+	render "github.com/akuity/kargo-render"
+	libLog "github.com/akuity/kargo-render/internal/log"
+	libOS "github.com/akuity/kargo-render/internal/os"
+	"github.com/akuity/kargo-render/internal/version"
+)
+
+type actionOptions struct{}
+
+func newActionCommand() *cobra.Command {
+	cmdOpts := &actionOptions{}
+
+	return &cobra.Command{
+		Use:    "action",
+		Hidden: true,
+		Args:   cobra.NoArgs,
+		RunE: func(cmd *cobra.Command, _ []string) error {
+			return cmdOpts.run(cmd.Context(), cmd.OutOrStdout())
+		},
+	}
+}
+
+// run performs manifest rendering in a GitHub Actions-compatible manner.
+func (o *actionOptions) run(_ context.Context, out io.Writer) error {
+	logger := libLog.LoggerOrDie()
+
+	ver := version.GetVersion()
+	logger.WithFields(log.Fields{
+		"version": ver.Version,
+		"commit":  ver.GitCommit,
+	}).Info("Starting Kargo Render Action")
+
+	req, err := request()
+	if err != nil {
+		logger.Fatal(err)
+	}
+
+	res, err := render.NewService(
+		&render.ServiceOptions{
+			LogLevel: render.LogLevel(logger.Level),
+		},
+	).RenderManifests(context.Background(), req)
+	if err != nil {
+		logger.Fatal(err)
+	}
+
+	switch res.ActionTaken {
+	case render.ActionTakenNone:
+		fmt.Fprintln(
+			out,
+			"\nThis request would not change any state. No action was taken.",
+		)
+	case render.ActionTakenOpenedPR:
+		fmt.Fprintf(
+			out,
+			"\nOpened PR %s\n",
+			res.PullRequestURL,
+		)
+	case render.ActionTakenPushedDirectly:
+		fmt.Fprintf(
+			out,
+			"\nCommitted %s to branch %s\n",
+			res.CommitID,
+			req.TargetBranch,
+		)
+	case render.ActionTakenUpdatedPR:
+		fmt.Fprintf(
+			out,
+			"\nUpdated an existing PR to %s\n",
+			req.TargetBranch,
+		)
+	}
+
+	return nil
+}
+
+func request() (render.Request, error) {
+	req := render.Request{
+		RepoCreds: render.RepoCredentials{
+			Username: "git",
+		},
+		Images: libOS.GetStringSliceFromEnvVar("INPUT_IMAGES", nil),
+	}
+	repo, err := libOS.GetRequiredEnvVar("GITHUB_REPOSITORY")
+	if err != nil {
+		return req, err
+	}
+	req.RepoURL = fmt.Sprintf("https://github.com/%s", repo)
+	if req.RepoCreds.Password, err =
+		libOS.GetRequiredEnvVar("INPUT_PERSONALACCESSTOKEN"); err != nil {
+		return req, err
+	}
+	if req.Ref, err = libOS.GetRequiredEnvVar("GITHUB_SHA"); err != nil {
+		return req, err
+	}
+	req.TargetBranch, err = libOS.GetRequiredEnvVar("INPUT_TARGETBRANCH")
+	return req, err
+}

cmd/action/request_test.go → cmd/action_cmd_test.go

@@ -1,4 +1,4 @@
-package action
+package main
 
 import (
 	"fmt"