nx affected:build failing with 'fatal: Not a valid object name main' error on github action pipeline

Current Behavior

nx affected:build command failing on github action pipeline process

Resolving deltas: 100% (4378/4378), done.
  From https://github.com/asleep-ai/Root-web
   * [new branch]      bugfix/APP-364                           -> origin/bugfix/APP-364
   * [new branch]      bugfix/actions                           -> origin/bugfix/actions
   * [new branch]      dependabot/npm_and_yarn/cypress-10.3.0   -> origin/dependabot/npm_and_yarn/cypress-10.3.0
   * [new branch]      dependabot/npm_and_yarn/metro-0.71.3     -> origin/dependabot/npm_and_yarn/metro-0.71.3
   * [new branch]      dependabot/npm_and_yarn/metro-babel-register-0.71.3 -> origin/dependabot/npm_and_yarn/metro-babel-register-0.71.3
   * [new branch]      dependabot/npm_and_yarn/react-native-community/cli-8.0.3 -> origin/dependabot/npm_and_yarn/react-native-community/cli-8.0.3
   * [new branch]      dependabot/npm_and_yarn/react-native-community/cli-platform-android-8.0.2 -> origin/dependabot/npm_and_yarn/react-native-community/cli-platform-android-8.0.2
   * [new branch]      develop                                  -> origin/develop
   * [new branch]      main                                     -> origin/main
   * [new branch]      release                                  -> origin/release
   * [new branch]      with-graphql-codegen                     -> origin/with-graphql-codegen
   * [new ref]         07c1295939e85a855d75ab39859f8eac04c7a4ed -> pull/183/merge
   
      Checking out the ref
  /usr/bin/git checkout --progress --force refs/remotes/pull/183/merge
  Note: switching to 'refs/remotes/pull/183/merge'.
  
  You are in 'detached HEAD' state. You can look around, make experimental
  changes and commit them, and you can discard any commits you make in this
  state without impacting any branches by switching back to a branch.
  
  If you want to create a new branch to retain commits you create, you may
  do so (now or later) by using -c with the switch command. Example:
  
    git switch -c <new-branch-name>
  
  Or undo this operation with:
  
    git switch -
  
  Turn off this advice by setting config variable advice.detachedHead to false
  
  HEAD is now at 07c1295 Merge 895027c6922cc908e7c6acf6c708caec70e08644 into 68160541c47a3fe10eaf986092c839428e0c0ae7
/usr/bin/git log -1 --format='%H'
'07c[1](https://github.com/Root-web/runs/7406060356?check_suite_focus=true#step:3:1)295939e85a855d[75](https://github.com/Root-web/runs/7406060356?check_suite_focus=true#step:3:77)ab39[85](https://github.com/Root-web/runs/7406060356?check_suite_focus=true#step:3:87)9f8eac04c7a4ed'

Building using yarn run affected:build
  /usr/local/bin/yarn run affected:build
  yarn run v1.22.19
  $ nx affected:build
  
   >  NX   Affected criteria defaulted to --base=main --head=HEAD
  
  fatal: Not a valid object name main
  fatal: No such ref: 'main'
  nx affected:build
  
  Run command using --base=[SHA1] (affected by the committed, uncommitted and untracked changes):
    --base  Base of the current branch (usually main)  [string]
  
  or using --base=[SHA1] --head=[SHA2] (affected by the committed changes):
    --base  Base of the current branch (usually main)  [string]
    --head  Latest commit of the current branch (usually HEAD)  [string]
  
  or using:
    --files        Change the way Nx is calculating the affected command by providing directly changed files, list of files delimited by commas  [array]
    --uncommitted  Uncommitted changes  [boolean]
    --untracked    Untracked changes  [boolean]
  
  Options:
    --help              Show help  [boolean]
    --version           Show version number  [boolean]
    --parallel          Max number of parallel processes [default is 3]  [string]
    --output-style      Defines how Nx emits outputs tasks logs  [string] [choices: "dynamic", "static", "stream", "stream-without-prefixes"]
    --all               All projects  [boolean]
    --exclude           Exclude certain projects from being processed  [array] [default: []]
    --runner            This is the name of the tasks runner configured in nx.json  [string]
    --skip-nx-cache     Rerun the tasks even when the results are available in the cache  [boolean] [default: false]
    --configuration     This is the configuration to use when performing tasks on projects  [string]
    --only-failed       Isolate projects which previously failed  [deprecated: The command to rerun failed projects will appear if projects fail. This now does nothing and will be removed in v15.] [boolean] [default: false]
    --verbose           Print additional error stack trace on failure
    --nx-bail           Stop command execution after the first failed task  [boolean] [default: false]
    --nx-ignore-cycles  Ignore cycles in the task graph  [boolean] [default: false]
  
  Examples:
    affected --target=custom-target                         Run custom target for all affected projects
    affected --target=test --parallel=5                     Run tests in parallel
    affected --target=test --all                            Run the test target for all projects
    affected --target=test --files=libs/mylib/src/index.ts  Run tests for all the projects affected by changing the index.ts file
    affected --target=test --base=main --head=HEAD          Run tests for all the projects affected by the changes between main and HEAD (e.g., PR)
    affected --target=test --base=main~1 --head=main        Run tests for all the projects affected by the last commit on main
  
  Find more information and examples at https://nx.dev/cli/affected
  
  Error: Command failed: git merge-base --fork-point "main" "HEAD"
  fatal: No such ref: 'main'
  
      at checkExecSyncError (node:child_process:[82](https://github.com/Root-web/runs/7406060356?check_suite_focus=true#step:3:84)8:11)
      at execSync (node:child_process:[89](https://github.com/Root-web/runs/7406060356?check_suite_focus=true#step:3:91)9:15)
      at getFilesUsingBaseAndHead (/home/runner/work/Root-web/Root-web/node_modules/nx/src/utils/command-line-utils.js:282:50)
      at parseFiles (/home/runner/work/Root-web/Root-web/node_modules/nx/src/utils/command-line-utils.js:257:20)
      at projectsToRun (/home/runner/work/Root-web/Root-web/node_modules/nx/src/command-line/affected.js:97:145)
      at Object.<anonymous> (/home/runner/work/Root-web/Root-web/node_modules/nx/src/command-line/affected.js:26:26)
      at Generator.next (<anonymous>)
      at fulfilled (/home/runner/work/Root-web/Root-web/node_modules/tslib/tslib.js:115:62)
      at processTicksAndRejections (node:internal/process/task_queues:[96](https://github.com/Root-web/runs/7406060356?check_suite_focus=true#step:3:98):5) {
    status: [128](https://github.com/Root-web/runs/7406060356?check_suite_focus=true#step:3:130),
    signal: null,
    output: [
      null,
      <Buffer >,
      <Buffer 66 61 74 61 6c 3a 20 4e 6f 20 73 75 63 68 20 72 65 66 3a 20 27 6d 61 69 6e 27 0a>
    ],
    pid: 2537,
    stdout: <Buffer >,
    stderr: <Buffer 66 61 74 61 6c 3a 20 4e 6f 20 73 75 63 68 20 72 65 66 3a 20 27 6d 61 69 6e 27 0a>
  }
  error Command failed with exit code 1.
  info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
  Error: The process '/usr/local/bin/yarn' failed with exit code 1

nx seems to not know the existence of main branch. before running the building process actions/checkout@v3 is being executed to checkout the latest HEAD (and also fetches all branches with fetch-depth 0)

Expected Behavior

nx affected:build to succeed.

Environment

on: [pull_request]

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v3
        with:
          fetch-depth: 0
      - uses: preactjs/compressed-size-action@v2
        with:
          repo-token: '${{ secrets.GITHUB_TOKEN }}'
          build-script: 'nx affected:build'
          clean-script: 'clean:by-bot'
          pattern: './dist/**/*.{js,css,html,json}'
          exclude: '{./dist/manifest.json,**/*.map,**/node_modules/**,**/next.config.js,**/public/**}```
          
this is the script that runs for the action and it gets error on the build-script process

[DannyPark1]

@jcqvisser Thanks to you it solved my problem! thank you

[jcqvisser]

@DannyPark1

In that case you’d set the defaultBase to "main".

That’ll work locally, since you’d presumably have a main branch that tracks origin/main.

To get it to work on github-actions, you’ll have to create a local branch that tracks origin/main. I guess you could try creating main that tracks origin/main manually, though I haven’t tried this. 🤷

on: [pull_request]

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v3
        with:
          fetch-depth: 0
      - name: "create-main-branch"
        run: "git branch --track main origin/main"
      - uses: preactjs/compressed-size-action@v2
        with:
          repo-token: '${{ secrets.GITHUB_TOKEN }}'
          build-script: 'nx affected:build'
          clean-script: 'clean:by-bot'
          pattern: './dist/**/*.{js,css,html,json}'
          exclude: '{./dist/manifest.json,**/*.map,**/node_modules/**,**/next.config.js,**/public/**}