Fix a panic that could occur when context was omitted (#83)

I could have sworn the context property was required, but evidently it
isn't and we weren't handling the case when it was missing.

This PR updates things to set a default location of the current
directory if the context is absent. Some unit tests are also added.

Fixes #78.

sdk/dotnet/Image.cs

@@ -557,7 +557,7 @@ namespace Pulumi.DockerBuild
         public Output<ImmutableArray<Outputs.CacheTo>> CacheTo { get; private set; } = null!;
 
         /// <summary>
-        /// Build context settings.
+        /// Build context settings. Defaults to the current directory.
         /// 
         /// Equivalent to Docker's `PATH | URL | -` positional argument.
         /// </summary>
@@ -897,7 +897,7 @@ namespace Pulumi.DockerBuild
         }
 
         /// <summary>
-        /// Build context settings.
+        /// Build context settings. Defaults to the current directory.
         /// 
         /// Equivalent to Docker's `PATH | URL | -` positional argument.
         /// </summary>

sdk/go/dockerbuild/image.go

@@ -582,7 +582,7 @@ type Image struct {
 	//
 	// Equivalent to Docker's `--cache-to` flag.
 	CacheTo CacheToArrayOutput `pulumi:"cacheTo"`
-	// Build context settings.
+	// Build context settings. Defaults to the current directory.
 	//
 	// Equivalent to Docker's `PATH | URL | -` positional argument.
 	Context BuildContextPtrOutput `pulumi:"context"`
@@ -804,7 +804,7 @@ type imageArgs struct {
 	//
 	// Equivalent to Docker's `--cache-to` flag.
 	CacheTo []CacheTo `pulumi:"cacheTo"`
-	// Build context settings.
+	// Build context settings. Defaults to the current directory.
 	//
 	// Equivalent to Docker's `PATH | URL | -` positional argument.
 	Context *BuildContext `pulumi:"context"`
@@ -952,7 +952,7 @@ type ImageArgs struct {
 	//
 	// Equivalent to Docker's `--cache-to` flag.
 	CacheTo CacheToArrayInput
-	// Build context settings.
+	// Build context settings. Defaults to the current directory.
 	//
 	// Equivalent to Docker's `PATH | URL | -` positional argument.
 	Context BuildContextPtrInput
@@ -1165,7 +1165,7 @@ func (o ImageOutput) CacheTo() CacheToArrayOutput {
 	return o.ApplyT(func(v *Image) CacheToArrayOutput { return v.CacheTo }).(CacheToArrayOutput)
 }
 
-// Build context settings.
+// Build context settings. Defaults to the current directory.
 //
 // Equivalent to Docker's `PATH | URL | -` positional argument.
 func (o ImageOutput) Context() BuildContextPtrOutput {

sdk/go/dockerbuild/x/image.go

@@ -582,7 +582,7 @@ type Image struct {
 	//
 	// Equivalent to Docker's `--cache-to` flag.
 	CacheTo pulumix.GArrayOutput[CacheTo, CacheToOutput] `pulumi:"cacheTo"`
-	// Build context settings.
+	// Build context settings. Defaults to the current directory.
 	//
 	// Equivalent to Docker's `PATH | URL | -` positional argument.
 	Context pulumix.GPtrOutput[BuildContext, BuildContextOutput] `pulumi:"context"`
@@ -804,7 +804,7 @@ type imageArgs struct {
 	//
 	// Equivalent to Docker's `--cache-to` flag.
 	CacheTo []CacheTo `pulumi:"cacheTo"`
-	// Build context settings.
+	// Build context settings. Defaults to the current directory.
 	//
 	// Equivalent to Docker's `PATH | URL | -` positional argument.
 	Context *BuildContext `pulumi:"context"`
@@ -952,7 +952,7 @@ type ImageArgs struct {
 	//
 	// Equivalent to Docker's `--cache-to` flag.
 	CacheTo pulumix.Input[[]*CacheToArgs]
-	// Build context settings.
+	// Build context settings. Defaults to the current directory.
 	//
 	// Equivalent to Docker's `PATH | URL | -` positional argument.
 	Context pulumix.Input[*BuildContextArgs]
@@ -1151,7 +1151,7 @@ func (o ImageOutput) CacheTo() pulumix.GArrayOutput[CacheTo, CacheToOutput] {
 	return pulumix.GArrayOutput[CacheTo, CacheToOutput]{OutputState: unwrapped.OutputState}
 }
 
-// Build context settings.
+// Build context settings. Defaults to the current directory.
 //
 // Equivalent to Docker's `PATH | URL | -` positional argument.
 func (o ImageOutput) Context() pulumix.GPtrOutput[BuildContext, BuildContextOutput] {

sdk/java/src/main/java/com/pulumi/dockerbuild/Image.java

@@ -771,7 +771,7 @@ public class Image extends com.pulumi.resources.CustomResource {
         return Codegen.optional(this.cacheTo);
     }
     /**
-     * Build context settings.
+     * Build context settings. Defaults to the current directory.
      * 
      * Equivalent to Docker's `PATH | URL | -` positional argument.
      * 
@@ -780,7 +780,7 @@ public class Image extends com.pulumi.resources.CustomResource {
     private Output</* @Nullable */ BuildContext> context;
 
     /**
-     * @return Build context settings.
+     * @return Build context settings. Defaults to the current directory.
      * 
      * Equivalent to Docker&#39;s `PATH | URL | -` positional argument.
      * 

sdk/java/src/main/java/com/pulumi/dockerbuild/ImageArgs.java

@@ -169,7 +169,7 @@ public final class ImageArgs extends com.pulumi.resources.ResourceArgs {
     }
 
     /**
-     * Build context settings.
+     * Build context settings. Defaults to the current directory.
      * 
      * Equivalent to Docker's `PATH | URL | -` positional argument.
      * 
@@ -178,7 +178,7 @@ public final class ImageArgs extends com.pulumi.resources.ResourceArgs {
     private @Nullable Output<BuildContextArgs> context;
 
     /**
-     * @return Build context settings.
+     * @return Build context settings. Defaults to the current directory.
      * 
      * Equivalent to Docker&#39;s `PATH | URL | -` positional argument.
      * 
@@ -816,7 +816,7 @@ public final class ImageArgs extends com.pulumi.resources.ResourceArgs {
         }
 
         /**
-         * @param context Build context settings.
+         * @param context Build context settings. Defaults to the current directory.
          * 
          * Equivalent to Docker&#39;s `PATH | URL | -` positional argument.
          * 
@@ -829,7 +829,7 @@ public final class ImageArgs extends com.pulumi.resources.ResourceArgs {
         }
 
         /**
-         * @param context Build context settings.
+         * @param context Build context settings. Defaults to the current directory.
          * 
          * Equivalent to Docker&#39;s `PATH | URL | -` positional argument.
          * 

sdk/nodejs/image.ts

@@ -545,7 +545,7 @@ export class Image extends pulumi.CustomResource {
      */
     public readonly cacheTo!: pulumi.Output<outputs.CacheTo[] | undefined>;
     /**
-     * Build context settings.
+     * Build context settings. Defaults to the current directory.
      *
      * Equivalent to Docker's `PATH | URL | -` positional argument.
      */
@@ -842,7 +842,7 @@ export interface ImageArgs {
      */
     cacheTo?: pulumi.Input<pulumi.Input<inputs.CacheToArgs>[]>;
     /**
-     * Build context settings.
+     * Build context settings. Defaults to the current directory.
      *
      * Equivalent to Docker's `PATH | URL | -` positional argument.
      */

sdk/python/pulumi_docker_build/image.py

@@ -76,7 +76,7 @@ class ImageArgs:
         :param pulumi.Input[Sequence[pulumi.Input['CacheToArgs']]] cache_to: Cache import configuration.
                
                Equivalent to Docker's `--cache-to` flag.
-        :param pulumi.Input['BuildContextArgs'] context: Build context settings.
+        :param pulumi.Input['BuildContextArgs'] context: Build context settings. Defaults to the current directory.
                
                Equivalent to Docker's `PATH | URL | -` positional argument.
         :param pulumi.Input['DockerfileArgs'] dockerfile: Dockerfile settings.
@@ -328,7 +328,7 @@ class ImageArgs:
     @pulumi.getter
     def context(self) -> Optional[pulumi.Input['BuildContextArgs']]:
         """
-        Build context settings.
+        Build context settings. Defaults to the current directory.
 
         Equivalent to Docker's `PATH | URL | -` positional argument.
         """
@@ -944,7 +944,7 @@ class Image(pulumi.CustomResource):
         :param pulumi.Input[Sequence[pulumi.Input[pulumi.InputType['CacheToArgs']]]] cache_to: Cache import configuration.
                
                Equivalent to Docker's `--cache-to` flag.
-        :param pulumi.Input[pulumi.InputType['BuildContextArgs']] context: Build context settings.
+        :param pulumi.Input[pulumi.InputType['BuildContextArgs']] context: Build context settings. Defaults to the current directory.
                
                Equivalent to Docker's `PATH | URL | -` positional argument.
         :param pulumi.Input[pulumi.InputType['DockerfileArgs']] dockerfile: Dockerfile settings.
@@ -1552,7 +1552,7 @@ class Image(pulumi.CustomResource):
     @pulumi.getter
     def context(self) -> pulumi.Output[Optional['outputs.BuildContext']]:
         """
-        Build context settings.
+        Build context settings. Defaults to the current directory.
 
         Equivalent to Docker's `PATH | URL | -` positional argument.
         """