Can I specify a specific branch on GitHub pull-only (read-only)?

Is there a way 开发者_如何学JAVAto set a specific branch on GitHub to pull-only (read-only) or can I only set this for the whole repository?

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You actually can (sort of), since September 2015.

That is because you now have "Protected branches and required status checks" (September 3, 2015), which allows you to protect a branch:

• against forced pushed
• against deletion
• against merged changes until required status checks pass

As mentioned in the twitter discussion:

@github nice, what about protect from just push and allow only operating through pull requests?

Adam Roben ‏@aroben @lowl4tency You can do this via the Status API:
create a "success" status only on commits in PRs, then mark that status as required.

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Since Nov. 2015, you can protect a branch with the API:

curl "https://api.github.com/repos/github/hubot/branches/master" \
  -XPATCH \
  -H 'Authorization: token TOKEN'
  -H "Accept: application/vnd.github.loki-preview" \
  -d '{
    "protection": {
      "enabled": true,
      "required_status_checks": {
        "enforcement_level": "everyone",
        "contexts": [
          "required-status"
        ]
      }
    }
  }'

How can I try it?

To access this functionality during the preview period, you’ll need to provide the following custom media type in the Accept header:

application/vnd.github.loki-preview+json

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Since March 2016, Organizations can now specify which members and teams are able to push to a protected branch.

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There is no way to do branch level permissions on Github, but the gitolite project supports what you're looking for.

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Starting from March 30th 2016, GitHub does support branch permissions without any further tricks like required status checks: https://github.com/blog/2137-protected-branches-improvements

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This request can now be done with the option Lock branch.

Reference: New Branch Protections: Last Pusher and Locked Branch

Lock branch

This allows for branches to be locked, prohibiting changes. You can lock a branch allowing you to have a maintenance window and prevent changes, or to protect a fork so it only receives changes from its upstream repository.

To use this feature in a branch protection rule, enable Lock branch.

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Go to the Settings, Add the branch as a protected branch and then there is an option as : Lock Branch (Branch is read-only. Users cannot push to the branch.)