maker-dmg fails when run in parallel

[macdja38]

Pre-flight checklist

• I have read the contribution documentation for this project.
• I agree to follow the code of conduct that this project uses.
• I have searched the issue tracker for a bug that matches the one I want to file, without success.

Electron Forge version

7.3.0

Electron version

N/A

Operating system

macOS 14.3

Last known working Electron Forge version

It broke in 7.0.0

Expected behavior

Expect electron-forge make -- --arch=x64,arm64 to build both x64 and arm64 versions of the app.

Actual behavior

Both x64 and arm64 make steps fail.
with the error Target already exists
node_modules/appdmg/lib/appdmg.js:81:53

Steps to reproduce

electron-forge make -- --arch=x64,arm64

{
	name: "@electron-forge/maker-dmg",
	config: {
		debug: true,
		overwrite: true,
	},
	platforms: ["darwin"],
}

Additional information

For context it'll be helpful to read through this PR that changed how makers are run. #3363

I dug into this a bit.
the specific target error comes from appdmg.js:81:53

On a run through with just one target that succeeded:

console.log("Target step started", global.target);
at the start of that shows

[REDACTED]/desktop/out/make/OurAppName.dmg for both of the builds that are happening simultaneously

I took a look at the electron code that calls into that @electron-forge/maker-dmg/src/MakerDMG.ts
output on line 21 is the one used as the target.
forgeDefaultOutPath is fine though. For example:
[REDACTED]/desktop/out/make/OurAppName-1.2.3-arm64.dmg

dmgConfig is

overwrite = true
name = "OurAppName"
debug = true
icon = "assets/resources/icon.icns"
background = "assets/resources/installBackground.png"
appPath = "[REDACTED]/desktop/out/OurAppName-darwin-arm64/OurAppName.app"
out = "[REDACTED]/desktop/out/make"

Execution goes into the conditional (if !this.config.name)

I think this could probably be fixed by adding the targetArch to the outPath.

I plan on submitting a PR to fix this soon.

[kevincerro]

I have the same issue when building to arm and x64 using electron-forge make --arch=x64,arm64

[Innei]

Also in MakerSquirrel MakerAppImage

with

   new MakerSquirrel((arch) => ({
      name: `Follow-${arch}`,
      setupIcon: "resources/icon.ico",
    })),
    new MakerAppImage((arch) => ({
      options: {
        name: `Follow-${arch}`,
        icon: "resources/icon.png",
        mimeType: ["x-scheme-handler/follow"],
      },
    })),

[didix16]

I have the same issue when building to arm and x64 using electron-forge make --arch=x64,arm64

Yeah me too. Is there any solution about that?

[lockiechen]

same here, any suggestion?

[macdja38]

I use the code in this PR via this npm package:

"devDependencies": {
    "@electron-forge/maker-dmg": "https://registry.npmjs.org/@fellow/maker-dmg/-/maker-dmg-7.4.0.tgz",
}

[tanishqkancharla]

This is my workaround: I just use a different name for the dmg maker on different archs:

new MakerDMG((arch) => ({
  name: `<app_name> Installer (${arch})`,
})),