HACK: Add --push and --load support to build cmd

Well, actually... We're not "fully" supporting these capabilities,
instead we are changing the least amount of code to give a "close
enough" experience.

The reason of such clumsy approach is that we are aiming for fully
migrate into docker buildx + remote buildkit, since img is no longer
maitained.

Signed-off-by: Jonnatan Jossemar Cordero <[email protected]>

Author: jossemargt-cto-ai

build.go

@@ -72,6 +72,8 @@ func newBuildCommand() *cobra.Command {
 	fs.Var(build.labels, "label", "Set metadata for an image")
 	fs.BoolVar(&build.noConsole, "no-console", false, "Use non-console progress UI")
 	fs.BoolVar(&build.noCache, "no-cache", false, "Do not use cache when building the image")
+	fs.BoolVar(&build.push, "push", false, "Shorthand for \"--output=type=registry\"")
+	fs.BoolVar(&build.load, "load", false, "Shorthand for \"--output=type=docker\"") // no-op flag
 	fs.StringVarP(&build.output, "output", "o", "", "BuildKit output specification (e.g. type=tar,dest=build.tar)")
 	fs.Var(build.cacheFrom, "cache-from", "Buildkit import-cache or Buildx cache-from specification")
 	fs.Var(build.cacheTo, "cache-to", "Buildx cache-to specification")
@@ -93,6 +95,8 @@ type buildCommand struct {
 	contextDir string
 	noConsole  bool
 	noCache    bool
+	push       bool
+	load       bool // no-op
 }
 
 // validateTag checks if the given image name can be resolved, and ensures the latest tag is added if it is missing.
@@ -125,6 +129,10 @@ func (cmd *buildCommand) ValidateArgs(c *cobra.Command, args []string) error {
 			}
 			out[0].Attrs["name"] = validated
 		}
+		if out[0].Type == "registry" {
+			cmd.push = true
+			return nil
+		}
 		cmd.bkoutput = out[0]
 	} else if cmd.tags.Len() < 1 {
 		return errors.New("please specify an image tag with `-t` or an output spec with `-o`")
@@ -343,6 +351,15 @@ func (cmd *buildCommand) Run(args []string) (err error) {
 	}
 	fmt.Fprintf(os.Stderr, "Successfully built %s\n", initialTag)
 
+	// HACK: Mimic buildx --push behavior
+	if cmd.push {
+		for _, image := range cmd.tags.values {
+			pushCmd := pushCommand{}
+			if err := pushCmd.Run([]string{image}); err != nil {
+				return err
+			}
+		}
+	}
 	return nil
 }