electron-builder: Unable to publish assets to Github (ReleaseAsset asset_already_exists)

• Version: 20.38.4

• Target: mac/windows/linux

Since updating from 20.38.2 -> 20.38.4 electron-build has been unable to publish assets to a github release page. Downgrading to 20.38.2 resolves the issue.

It fails on publishing every asset from every os.

Here is an example: https://travis-ci.org/LN-Zap/zap-desktop/jobs/469993385#L2805

2018-12-19T13:21:03.988Z electron-builder Response: 422 Unprocessable Entity, request options: {
  "hostname": "uploads.github.com",
  "path": "/repos/LN-Zap/zap-desktop/releases/13734557/assets?name=ZapDesktop-linux-i386-v0.3.0-beta.deb",
  "method": "POST",
  "headers": {
    "accept": "application/vnd.github.v3+json",
    "Content-Type": "application/octet-stream",
    "Content-Length": 52382742,
    "authorization": "<stripped sensitive data>",
    "User-Agent": "electron-builder",
    "Cache-Control": "no-cache"
  }
}
  • async task error error=
                       422 Unprocessable Entity
                       {
                         "message": "Validation Failed",
                         "request_id": "E166:5EBB:2E3AE0:33E8F0:5C1A45BF",
                         "documentation_url": "https://developer.github.com/v3",
                         "errors": [
                           {
                             "resource": "ReleaseAsset",
                             "code": "already_exists",
                             "field": "name"
                           }
                         ]
                       }
                       Headers: {
                         "cache-control": "no-cache",
                         "content-length": "211",
                         "content-security-policy": "default-src 'none'",
                         "content-type": "application/json; charset=utf-8",
                         "strict-transport-security": "max-age=31557600",
                         "x-accepted-oauth-scopes": "repo",
                         "x-content-type-options": "nosniff",
                         "x-frame-options": "deny",
                         "x-github-media-type": "github.v3; format=json",
                         "x-oauth-scopes": "public_repo",
                         "x-xss-protection": "1; mode=block",
                         "date": "Wed, 19 Dec 2018 13:21:04 GMT",
                         "connection": "close",
                         "x-github-request-id": "E166:5EBB:2E3AE0:33E8F0:5C1A45BF"
                       }
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! zap-desktop@0.3.0-beta package: `npm run build && npm run fetch-lnd && build "--publish" "onTagOrDraft" "--linux"`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the zap-desktop@0.3.0-beta package script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR!     /home/travis/.npm/_logs/2018-12-19T13_21_04_026Z-debug.log
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
Script failed with status 1
failed to deploy

If I delete the existing assets from the draft github release and try again then it works, but only the first time. Every subsequent attempt fails with the same error ^.

Here are some other similar issues where this was reported in the past:

• https://github.com/electron-userland/electron-builder/issues/2396
• https://github.com/electron-userland/electron-builder/issues/2094
• https://github.com/electron-userland/electron-builder/issues/2337