releaser: add dry run mode

Signed-off-by: David Karlsson <35727626+dvdksn@users.noreply.github.com>

_releaser/Dockerfile

@@ -19,6 +19,7 @@ RUN --mount=type=bind,target=. \
   go build -o /out/releaser .
 
 FROM base AS aws-s3-update-config
+ARG DRY_RUN=false
 ARG AWS_REGION
 ARG AWS_S3_BUCKET
 ARG AWS_S3_CONFIG
@@ -30,6 +31,7 @@ RUN --mount=type=bind,target=. \
   releaser aws s3-update-config
 
 FROM base AS aws-lambda-invoke
+ARG DRY_RUN=false
 ARG AWS_REGION
 ARG AWS_LAMBDA_FUNCTION
 RUN --mount=type=bind,from=releaser,source=/out/releaser,target=/usr/bin/releaser \
@@ -39,6 +41,7 @@ RUN --mount=type=bind,from=releaser,source=/out/releaser,target=/usr/bin/release
   releaser aws lambda-invoke
 
 FROM base AS aws-cloudfront-update
+ARG DRY_RUN=false
 ARG AWS_REGION
 ARG AWS_LAMBDA_FUNCTION
 ARG AWS_CLOUDFRONT_ID

_releaser/aws.go

@@ -30,9 +30,15 @@ type AwsS3UpdateConfigCmd struct {
 	Region   string `kong:"name='region',env='AWS_REGION'"`
 	S3Bucket string `kong:"name='s3-bucket',env='AWS_S3_BUCKET'"`
 	S3Config string `kong:"name='s3-website-config',env='AWS_S3_CONFIG'"`
+	DryRun   bool   `kong:"name='dry-run',env='DRY_RUN'"`
 }
 
 func (s *AwsS3UpdateConfigCmd) Run() error {
+	if s.DryRun {
+		log.Printf("INFO: Dry run mode enabled. Configuration:\nRegion: %s\nS3Bucket: %s\nS3Config: %s\n", s.Region, s.S3Bucket, s.S3Config)
+		return nil
+	}
+
 	file, err := os.ReadFile(s.S3Config)
 	if err != nil {
 		return fmt.Errorf("failed to read s3 config file %s: %w", s.S3Config, err)
@@ -74,9 +80,15 @@ func (s *AwsS3UpdateConfigCmd) Run() error {
 type AwsLambdaInvokeCmd struct {
 	Region         string `kong:"name='region',env='AWS_REGION'"`
 	LambdaFunction string `kong:"name='lambda-function',env='AWS_LAMBDA_FUNCTION'"`
+	DryRun         bool   `kong:"name='dry-run',env='DRY_RUN'"`
 }
 
 func (s *AwsLambdaInvokeCmd) Run() error {
+	if s.DryRun {
+		log.Printf("INFO: Dry run mode enabled. Configuration:\nRegion: %s\nLambdaFunction: %s\n", s.Region, s.LambdaFunction)
+		return nil
+	}
+
 	svc := lambda.New(session.Must(session.NewSessionWithOptions(session.Options{
 		SharedConfigState: session.SharedConfigEnable,
 	})), &aws.Config{
@@ -102,17 +114,24 @@ type AwsCloudfrontUpdateCmd struct {
 	CloudfrontID          string `kong:"name='cloudfront-id',env='AWS_CLOUDFRONT_ID'"`
 	RedirectsFile         string `kong:"name='redirects-file',env='REDIRECTS_FILE'"`
 	RedirectsPrefixesFile string `kong:"name='redirects-prefixes-file',env='REDIRECTS_PREFIXES_FILE'"`
+	DryRun                bool   `kong:"name='dry-run',env='DRY_RUN'"`
 }
 
 func (s *AwsCloudfrontUpdateCmd) Run() error {
 	var err error
 	ver := time.Now().UTC().Format(time.RFC3339)
 
-	zipdt, err := getLambdaFunctionZip(s.FunctionFile, s.RedirectsFile, s.RedirectsPrefixesFile)
+	zipdt, err := getLambdaFunctionZip(s.FunctionFile, s.RedirectsFile, s.RedirectsPrefixesFile, s.DryRun)
 	if err != nil {
 		return fmt.Errorf("cannot create lambda function zip: %w", err)
 	}
 
+	if s.DryRun {
+		log.Printf("INFO: Dry run mode enabled. Configuration:\nRegion: %s\nFunction: %s\nFunctionFile: %s\nCloudfrontID: %s\nRedirectsFile: %s\nRedirectsPrefixesFile: %s\n",
+			s.Region, s.Function, s.FunctionFile, s.CloudfrontID, s.RedirectsFile, s.RedirectsPrefixesFile)
+		return nil
+	}
+
 	svc := lambda.New(session.Must(session.NewSessionWithOptions(session.Options{
 		SharedConfigState: session.SharedConfigEnable,
 	})), &aws.Config{
@@ -228,7 +247,7 @@ func (s *AwsCloudfrontUpdateCmd) Run() error {
 	return nil
 }
 
-func getLambdaFunctionZip(funcFilename, redirectsFile, redirectsPrefixesFile string) ([]byte, error) {
+func getLambdaFunctionZip(funcFilename, redirectsFile, redirectsPrefixesFile string, dryrun bool) ([]byte, error) {
 	funcdt, err := os.ReadFile(funcFilename)
 	if err != nil {
 		return nil, fmt.Errorf("failed to read lambda function file %q: %w", funcFilename, err)
@@ -256,6 +275,11 @@ func getLambdaFunctionZip(funcFilename, redirectsFile, redirectsPrefixesFile str
 		return nil, err
 	}
 
+	if dryrun {
+		log.Printf("INFO: Dry run mode enabled. Lambda Function Definition:\n\n%s\n", funcbuf.String())
+		return nil, nil
+	}
+
 	tmpdir, err := os.MkdirTemp("", "lambda-zip")
 	if err != nil {
 		return nil, err

docker-bake.hcl

@@ -10,6 +10,10 @@ variable "DOCS_SITE_DIR" {
   default = "public"
 }
 
+variable "DRY_RUN" {
+  default = null
+}
+
 group "default" {
   targets = ["release"]
 }
@@ -98,6 +102,7 @@ variable "AWS_LAMBDA_FUNCTION" {
 
 target "_common-aws" {
   args = {
+    DRY_RUN = DRY_RUN
     AWS_REGION = AWS_REGION
     AWS_S3_BUCKET = AWS_S3_BUCKET
     AWS_S3_CONFIG = AWS_S3_CONFIG