bud: Add flags for specifying the runtime command

So long as it's possible to have an incompatible version of runc
installed, we're going to want to easily point to another version, as we
already allow for with the "run" command.

Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>

Closes: #76
Approved by: nalind

cmd/buildah/bud.go

@@ -8,6 +8,7 @@ import (
 
 	"github.com/Sirupsen/logrus"
 	"github.com/containers/storage/pkg/archive"
+	"github.com/projectatomic/buildah"
 	"github.com/projectatomic/buildah/imagebuildah"
 	"github.com/urfave/cli"
 )
@@ -39,6 +40,15 @@ var (
 			Name:  "build-arg",
 			Usage: "`argument=value` to supply to the builder",
 		},
+		cli.StringFlag{
+			Name:  "runtime",
+			Usage: "`path` to an alternate runtime",
+			Value: buildah.DefaultRuntime,
+		},
+		cli.StringSliceFlag{
+			Name:  "runtime-flag",
+			Usage: "add global flags for the container runtime",
+		},
 		cli.StringFlag{
 			Name:  "tag, t",
 			Usage: "`tag` to apply to the built image",
@@ -77,6 +87,14 @@ func budCmd(c *cli.Context) error {
 	if c.IsSet("pull-always") {
 		pull = c.Bool("pull-always")
 	}
+	runtimeFlags := []string{}
+	if c.IsSet("runtime-flag") {
+		runtimeFlags = c.StringSlice("runtime-flag")
+	}
+	runtime := ""
+	if c.IsSet("runtime") {
+		runtime = c.String("runtime")
+	}
 
 	pullPolicy := imagebuildah.PullNever
 	if pull {
@@ -178,6 +196,8 @@ func budCmd(c *cli.Context) error {
 		SignaturePolicyPath: signaturePolicy,
 		Args:                args,
 		Output:              output,
+		Runtime:             runtime,
+		RuntimeArgs:         runtimeFlags,
 	}
 
 	return imagebuildah.BuildDockerfiles(store, options, dockerfiles...)

docs/buildah-bud.md

@@ -55,8 +55,8 @@ resulting image's configuration.
 
 **--runtime** *path*
 
-The *path* to an alternate runtime, which will be used to run commands
-specified by the **RUN** instruction.
+The *path* to an alternate OCI-compatible runtime, which will be used to run
+commands specified by the **RUN** instruction.
 
 **--runtime-flag** *flag*
 

docs/buildah-run.md

@@ -16,7 +16,7 @@ the *buildah config* command.
 
 **--runtime** *path*
 
-The *path* to an alternate runtime.
+The *path* to an alternate OCI-compatible runtime.
 
 **--runtime-flag** *flag*