How to fix git: 'credential-osxkeychain' is not a git command in Git

# Check Git version and location
which git
git --version

# Check current credential helper configuration
git config --global credential.helper
git config --list | grep credential

# Check if osxkeychain helper exists
git credential-osxkeychain
# If it exists, it will wait for input (press Ctrl+C to exit)

# Install Command Line Tools (opens a dialog)
xcode-select --install

# If already installed, you can reinstall:
sudo rm -rf /Library/Developer/CommandLineTools
xcode-select --install

# Verify installation
xcode-select -p
# Should show: /Library/Developer/CommandLineTools

git credential-osxkeychain
# Should wait for input (press Ctrl+C)

# Install Homebrew if not installed
/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

# Install or upgrade Git
brew install git
# or
brew upgrade git

# Ensure Homebrew Git is used (add to ~/.zshrc or ~/.bash_profile)
export PATH="/opt/homebrew/bin:$PATH"  # Apple Silicon
# or
export PATH="/usr/local/bin:$PATH"     # Intel Mac

# Reload shell configuration
source ~/.zshrc
# or
source ~/.bash_profile

# Verify the new Git is being used
which git
git --version

# Find where git-credential-osxkeychain is installed
find /usr -name "git-credential-osxkeychain" 2>/dev/null
find /Library -name "git-credential-osxkeychain" 2>/dev/null
find /opt -name "git-credential-osxkeychain" 2>/dev/null

# Common locations:
# /usr/local/git/bin/git-credential-osxkeychain
# /Library/Developer/CommandLineTools/usr/libexec/git-core/git-credential-osxkeychain
# /opt/homebrew/bin/git-credential-osxkeychain

# Create symbolic link to /usr/local/bin (commonly in PATH)
sudo ln -s /Library/Developer/CommandLineTools/usr/libexec/git-core/git-credential-osxkeychain /usr/local/bin/git-credential-osxkeychain

# Or link from Homebrew location
sudo ln -s /opt/homebrew/bin/git-credential-osxkeychain /usr/local/bin/git-credential-osxkeychain

# For GitHub Desktop (example)
ln -s /usr/local/bin/git-credential-osxkeychain "/Applications/GitHub Desktop.app/Contents/Resources/git/bin/git-credential-osxkeychain"

# For SourceTree
ln -s /usr/local/bin/git-credential-osxkeychain "/Applications/Sourcetree.app/Contents/Resources/git_local/bin/git-credential-osxkeychain"

# Remove any existing credential helper configuration
git config --global --unset-all credential.helper

# Configure osxkeychain as the credential helper
git config --global credential.helper osxkeychain

# Verify the configuration
git config --global credential.helper
# Should output: osxkeychain

# Test the helper
echo "protocol=https
host=github.com" | git credential-osxkeychain get
# If credentials exist, it will output them
# If not, it will output nothing (that's OK)

# Use the Git Credential Manager (recommended by GitHub)
brew install git-credential-manager
git config --global credential.helper manager

# Or use simple credential caching (temporary storage)
git config --global credential.helper cache

# Install Git Credential Manager via Homebrew
brew install git-credential-manager

# Configure Git to use GCM
git config --global credential.helper manager

# Verify installation
git credential-manager --version

# Check for existing SSH keys
ls -la ~/.ssh

# Generate a new SSH key (if needed)
ssh-keygen -t ed25519 -C "[email protected]"
# Press Enter to accept defaults, optionally set a passphrase

# Start the SSH agent and add your key
eval "$(ssh-agent -s)"
ssh-add ~/.ssh/id_ed25519

# Add to macOS Keychain (so you don't need to re-enter passphrase)
ssh-add --apple-use-keychain ~/.ssh/id_ed25519

# Copy the public key
pbcopy < ~/.ssh/id_ed25519.pub

# Check current remote
git remote -v

# Change from HTTPS to SSH
git remote set-url origin [email protected]:username/repo.git

# Test SSH connection
ssh -T [email protected]