Bash function to unsign the Xcode binary to allow loading of third party plugins again.

unsign_xcode.sh

# Assumes the `unsign` binary is in your PATH.
# https://github.com/steakknife/unsign
#
# (Download zip, run `make`, move the generated binary to /usr/bin)

# Remove Xcode code signature, backup stored as Xcode.signed
xcunsign() {
    _xcode=/Applications/Xcode.app/Contents/MacOS/Xcode
    
    # Is Xcode installed?
    if [ ! -f $_xcode ]
    then
        echo "Could not find Xcode binary at "$_xcode
        return
    fi
    
    # Is unsign installed?
    if ! type unsign >/dev/null
    then
        echo "Is unsign in your PATH?"
        return
    fi

    # Does Xcode.signed exist already?
    if [ -f $_xcode.signed ]
    then
        echo "It appears you have already removed Xcode's code signature."
        return
    fi

    sudo unsign $_xcode
    sudo mv -f $_xcode $_xcode.signed
    sudo mv -f $_xcode.unsigned $_xcode

    echo "Unsigned Xcode"
    echo "$_xcode -> $_xcode.signed"
    echo "$_xcode.unsigned -> $_xcode"
    echo
    echo "You can undo this operation by running xcundounsign"
}

# Restores backup by renaming Xcode.signed to Xcode
xcundounsign() {
    _xcode=/Applications/Xcode.app/Contents/MacOS/Xcode
    
    # Does Xcode.signed exist already?
    if [ ! -f $_xcode.signed ]
    then
        echo "Nothing to undo."
        return
    fi
    
    sudo mv $_xcode.signed $_xcode
    echo "$_xcode.signed -> $_xcode"
}