feat: using custom docker daemon (e.g podman)

The `func` binary is now aware of DOCKER_HOST environment variable.

Signed-off-by: Matej Vasek <mvasek@redhat.com>

Author: matejvasek

buildpacks/builder.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"runtime"
 
 	"github.com/buildpacks/pack"
 	"github.com/buildpacks/pack/logging"
@@ -54,10 +55,20 @@ func (builder *Builder) Build(f bosonFunc.Function) (err error) {
 	}
 
 	// Build options for the pack client.
+	var network string
+	if runtime.GOOS == "linux" {
+		network = "host"
+	}
+
 	packOpts := pack.BuildOptions{
 		AppPath: f.Root,
 		Image:   f.Image,
 		Builder: packBuilder,
+		DockerHost: os.Getenv("DOCKER_HOST"),
+		ContainerConfig: struct {
+			Network string
+			Volumes []string
+		}{Network: network, Volumes: nil},
 	}
 
 	// log output is either STDOUt or kept in a buffer to be printed on error.

go.mod

@@ -3,14 +3,14 @@ module github.com/boson-project/func
 go 1.14
 
 require (
-	github.com/buildpacks/pack v0.16.0
+	github.com/buildpacks/pack v0.17.1-0.20210221000942-0c84b4ae7a30
 	github.com/markbates/pkger v0.17.1
 	github.com/mitchellh/go-homedir v1.1.0
 	github.com/ory/viper v1.7.4
-	github.com/spf13/cobra v1.1.1
-	gopkg.in/yaml.v2 v2.3.0
-	k8s.io/api v0.18.8
-	k8s.io/apimachinery v0.19.1
+	github.com/spf13/cobra v1.1.3
+	gopkg.in/yaml.v2 v2.4.0
+	k8s.io/api v0.19.7
+	k8s.io/apimachinery v0.19.7
 	k8s.io/client-go v11.0.1-0.20190805182717-6502b5e7b1b5+incompatible
 	knative.dev/client v0.19.1
 	knative.dev/eventing v0.19.0
@@ -20,6 +20,6 @@ require (
 
 replace (
 	// Nail down k8 deps to align with transisitive deps
-	k8s.io/apimachinery => k8s.io/apimachinery v0.18.8
-	k8s.io/client-go => k8s.io/client-go v0.18.8
+	k8s.io/apimachinery => k8s.io/apimachinery v0.19.7
+	k8s.io/client-go => k8s.io/client-go v0.19.7
 )