"fatal: Failed to traverse parents of commit", when doing: "git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core fetch --unshallow"

[7k50]

I have just restored my MacOS system from Time Machine backup.

When trying brew update, I get the message:

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

However, running this command does not work:

~ ❯ git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core fetch --unshallow 12s
remote: Enumerating objects: 480408, done.
remote: Counting objects: 100% (480372/480372), done.
remote: Compressing objects: 100% (178624/178624), done.
remote: Total 471995 (delta 295846), reused 466669 (delta 290526), pack-reused 0
Receiving objects: 100% (471995/471995), 168.88 MiB | 10.90 MiB/s, done.
Resolving deltas: 100% (295846/295846), completed with 3889 local objects.
error: Could not read 6841d30d8558d9deb6081a97a27958481e24a452
fatal: Failed to traverse parents of commit d8193297fb082bfc31cff6500087b07fb553b783
error: remote did not send all necessary objects

I am not able to reinstall Homebrew using the command on brew.sh, because it will again ask me to "unshallow". I seem to be stuck in a loop that I don't know how to get out of.

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

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

[SMillerDev]

What happens when you run:

  git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core fetch
  git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core checkout master
  git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core reset --hard origin/master
  git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core fetch --unshallow

[7k50]

What happens when you run:

  git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core fetch
  git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core checkout master
  git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core reset --hard origin/master
  git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core fetch --unshallow

That did not appear to help:

~ ❯ git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core fetch
remote: Enumerating objects: 20, done.
remote: Counting objects: 100% (20/20), done.
remote: Compressing objects: 100% (6/6), done.
remote: Total 16 (delta 12), reused 14 (delta 10), pack-reused 0
Unpacking objects: 100% (16/16), 2.47 KiB | 31.00 KiB/s, done.
From https://github.com/Homebrew/homebrew-core
   dc0df95771d..9d75f75af7b  master     -> origin/master

~ ❯ git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core checkout master
Already on 'master'
Your branch is behind 'origin/master' by 4 commits, and can be fast-forwarded.
  (use "git pull" to update your local branch)

~ ❯ git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core reset --hard origin/master 
HEAD is now at 9d75f75af7b arangodb: update 3.7.5 bottle.

~ ❯ git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core fetch --unshallow
remote: Enumerating objects: 480408, done.
remote: Counting objects: 100% (480372/480372), done.
remote: Compressing objects: 100% (178624/178624), done.
remote: Total 471995 (delta 295846), reused 466669 (delta 290526), pack-reused 0
Receiving objects: 100% (471995/471995), 168.88 MiB | 9.61 MiB/s, done.
Resolving deltas: 100% (295846/295846), completed with 3889 local objects.
error: Could not read 6841d30d8558d9deb6081a97a27958481e24a452
fatal: Failed to traverse parents of commit d8193297fb082bfc31cff6500087b07fb553b783
error: remote did not send all necessary objects

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

[huenchen]

I had the same problem, what fixed it for me (twice) was:

brew untap homebrew/cask
brew tap homebrew/cask

[carlocab]

That might need to be

brew untap homebrew/core
brew tap homebrew/core

As brew update is complaining about homebrew/core. This will delete everything in @winterflags' local core repo though.

[gromgit]

What does git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core config -l output? (You may want to obfuscate any tokens or passwords in the output, but please don't change anything else.)

[7k50]

Here is the output:

credential.helper=osxkeychain
push.default=simple
user.name=MY_USERNAME
user.email=MY_EMAIL
filter.lfs.process=git-lfs filter-process
filter.lfs.required=true
filter.lfs.clean=git-lfs clean -- %f
filter.lfs.smudge=git-lfs smudge -- %f
core.repositoryformatversion=0
core.filemode=true
core.bare=false
core.logallrefupdates=true
core.ignorecase=true
core.precomposeunicode=true
core.autocrlf=false
remote.origin.url=https://github.com/Homebrew/homebrew-core
remote.origin.fetch=+refs/heads/*:refs/remotes/origin/*
homebrew.private=false
branch.master.remote=origin
branch.master.merge=refs/heads/master

[gromgit]

I see you're running Git LFS, which has a long association with weird Homebrew issues, and might be related to your problem. I strongly recommend disabling it first, then trying @carlocab's suggestions on repairing your core tap.

[7k50]

I see you're running Git LFS, which has a long association with weird Homebrew issues, and might be related to your problem. I strongly recommend disabling it first, then trying @carlocab's suggestions on repairing your core tap.

Thanks for the suggestion. I tried uninstalling GIT LFS, but it didn't actually seem to be actively installed despite the indication in config -l, when running git lfs uninstall it gave me the message: git: 'lfs' is not a git command. See 'git --help'.

[carlocab]

Unless you have work in your local homebrew/core repo, the simplest thing to do is probably just

brew untap homebrew/core
brew tap homebrew/core

If that still doesn't work, try

rm -rf /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core
brew tap homebrew/core

Be sure to cd out of the homebrew/core repo before rm -rf.

[7k50]

Unless you have work in your local homebrew/core repo, the simplest thing to do is probably just

brew untap homebrew/core
brew tap homebrew/core

If that still doesn't work, try

rm -rf /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core
brew tap homebrew/core

Be sure to cd out of the homebrew/core repo before rm -rf.

I tried untap/tap which didn't help, and then rm-rf/tap (for homebrew/core). Unfortunately that led me down a maze of problems that seems to be relating to Git Stashing and the SHA of .rb files in some way that is too much to recount here and that I don't exactly understand.

I finally solved my issues by deleting Homebrew and my casks completely, and reinstalled from scratch. Either way, thanks for the help!

[carlocab]

You had files that you couldn't even get rid of with rm -rf? Weird. Well, glad you've got it fixed now.