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Louis Faivre
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Asked: 2022-05-17T12:56:59+00:00 In:

How do I remove the shallow clone warning from homebrew?

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How to remove the shallow clone warning from HomeBrew? I get the following error message:

➜ ~ brew info test 
 Error: No available formula with the name "test" 
 ==> Searching for a previously deleted formula...
 Warning: homebrew/core is shallow clone. To get complete history run:
  git -C "$(brew --repo homebrew/core)" fetch --unshallow
 
 Error: No previously deleted formula found.

When I try to change the remote git address to mirror homebrew homebrew prior to. Can someone give me some good tips?

homebrew-core is a shallow clone
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2 Answers

  1. Best Answer
    Expert

    The cause: Because Homebrew no longer makes shallow clones when installed, and from December 2020, upgrading existing shallow clones is not permitted.

    Perhaps the issue is related to changing the git remote address to the homebrew mirror location previously.

    Solution:

    In most situations, the warning can be safely ignored because the formulae being sought are unlikely to exist.

    However, if you’re seeking certain formulae that may have existed in the past, simply follow the instructions.

    Run the following commands to acquire a complete history:

    git -C "$(brew --repo homebrew/core)" fetch --unshallow
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  2. Homebrew has stopped creating shallow copies when it is installed. Additionally, updating shallow clones that are already in use is now.

    This makes it moot to ask about silencing the warning.

    A message with text such as the following will be displayed if a shallow clone has been configured 

    Error:
 homebrew-core is a shallow clone.
 homebrew-cask is a shallow clone.
To `brew update`, first run:
 git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core fetch --unshallow
 git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask fetch --unshallow

    It is now necessary to execute the unshallow process. To do this, run the git command(s), as shown in the error message.

    Notification: If feedback is not provided, this process can take quite a while to complete.

    You can find more information about this change in the discussion on Homebrew’s GitHub page.

    Two major drawbacks to shallow cloning are:

    1. This creates a huge computational burden for GitHub’s servers. They must dynamically calculate a new delta between what you have and the most recent commit, on each brew update. With full clones, GitHub will simply send you the commits that occurred after your last pull. Your local Git client takes care the rest.
    2. It is much more likely that GitHub will limit Homebrew operations because of [1]. This will make it sucky for everyone.

    –gromgit December 5, 2020, 12:29 PM EST

    Also, this additional text was added to error message:

    This restriction has been made on GitHub’s request because updating shallow
    clones is an extremely expensive operation due to the tree layout and traffic of
    Homebrew/homebrew-core and Homebrew/homebrew-cask.

    • 5

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