Propose the ability to use podman

- fix the ldflags to be set in GOFLAGS, so there is no problem by
escaping environment variables
- ldflags "-H" should be set with equal sign `-H=windowsgui` instead of
`-H windowsgui'
- add podman detection
- add podman usage: no need to fix uid with gosu, podman has got an
option named "--userns" to set to "keep-id".

docker/base/docker-entrypoint.sh

@@ -1,6 +1,10 @@
 #!/bin/sh
 set -e
 
+if [ -n "$use_podman" ]; then
+ exec $@
+fi
+
 if [ -z "$fyne_uid" ] || [ $fyne_uid -eq 0 2>/dev/null ]; then
  eval exec $@ 
  exit $?

internal/command/docker.go

@@ -38,6 +38,17 @@ type Options struct {
  Debug bool // Debug if true enable log verbosity
 }
 
+// IsPodman returns true if docker is an alias to podman (e.g. via podman-docker).
+func IsPodman() bool {
+ out, err := exec.Command("docker", "info", "-f", "{{.Host.RemoteSocket.Path}}").Output()
+ if err != nil {
+ return false
+ }
+ // There should be an indication about the remote socket that is commonly named
+ // like /path/to/podman.sock
+ return strings.Index(string(out), "podman") > -1
+}
+
 // Cmd returns a command to run in a new container for the specified image
 func Cmd(image string, vol volume.Volume, opts Options, cmdArgs []string) *exec.Cmd {
 
@@ -50,12 +61,17 @@ func Cmd(image string, vol volume.Volume, opts Options, cmdArgs []string) *exec.
  args := []string{
  "run", "--rm", "-t",
  "-w", w, // set workdir
- "-v", fmt.Sprintf("%s:%s", vol.WorkDirHost(), vol.WorkDirContainer()), // mount the working dir
+ "-v", fmt.Sprintf("%s:%s:z", vol.WorkDirHost(), vol.WorkDirContainer()), // mount the working dir
+ }
+
+ if IsPodman() {
+ log.Info("USE PODMAN")
+ args = append(args, "--userns", "keep-id", "-e", "use_podman=1")
  }
 
  // mount the cache dir if cache is enabled
  if opts.CacheEnabled {
- args = append(args, "-v", fmt.Sprintf("%s:%s", vol.CacheDirHost(), vol.CacheDirContainer()))
+ args = append(args, "-v", fmt.Sprintf("%s:%s:z", vol.CacheDirHost(), vol.CacheDirContainer()))
  }
 
  // add default env variables
@@ -137,9 +153,12 @@ func goBuild(ctx Context) error {
 
  // add ldflags to command, if any
  if len(ldflags) > 0 {
- args = append(args, "-ldflags", fmt.Sprintf("'%s'", strings.Join(ldflags, " ")))
+ flags := make([]string, len(ldflags))
+ for i, flag := range ldflags {
+ flags[i] = fmt.Sprintf("-ldflags=%s", flag)
+ }
+ ctx.Env = append(ctx.Env, fmt.Sprintf("GOFLAGS=%s", strings.Join(flags, " ")))
  }
-
  // add tags to command, if any
  tags := ctx.Tags
  if len(tags) > 0 {

internal/command/windows.go

@@ -252,7 +252,7 @@ func makeWindowsContext(flags *windowsFlags, args []string) ([]Context, error) {
  }
 
  if !flags.Console {
- ctx.LdFlags = append(ctx.LdFlags, "-H windowsgui")
+ ctx.LdFlags = append(ctx.LdFlags, "-H=windowsgui")
  }
 
  if flags.DockerImage == "" {

internal/command/windows_test.go

@@ -42,7 +42,7 @@ func Test_makeWindowsContext(t *testing.T) {
  OS: "windows",
  Architecture: "amd64",
  Env: []string{"GOOS=windows", "GOARCH=amd64", "CC=x86_64-w64-mingw32-gcc"},
- LdFlags: []string{"-H windowsgui"},
+ LdFlags: []string{"-H=windowsgui"},
  DockerImage: "fyneio/fyne-cross:base-latest",
  },
  },
@@ -95,7 +95,7 @@ func Test_makeWindowsContext(t *testing.T) {
  OS: "windows",
  Architecture: "amd64",
  Env: []string{"GOOS=windows", "GOARCH=amd64", "CC=x86_64-w64-mingw32-gcc"},
- LdFlags: []string{"-X main.version=1.2.3", "-H windowsgui"},
+ LdFlags: []string{"-X main.version=1.2.3", "-H=windowsgui"},
  DockerImage: "fyneio/fyne-cross:base-latest",
  },
  },
@@ -122,7 +122,7 @@ func Test_makeWindowsContext(t *testing.T) {
  OS: "windows",
  Architecture: "amd64",
  Env: []string{"GOOS=windows", "GOARCH=amd64", "CC=x86_64-w64-mingw32-gcc"},
- LdFlags: []string{"-H windowsgui"},
+ LdFlags: []string{"-H=windowsgui"},
  DockerImage: "test",
  },
  },