Homebrew can't install Command Line Tools on macOS Catalina (10.15)

[maxim-lobanov]

What you were trying to do (and why)

I am trying to install brew on clean macOS Catalina (10.15) using the following command:
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

What happened (include command output)

Clean macOS Catalina image doesn't contain Command Line Tools and homebrew installer tries to install it but fails:

Command output

Installing Homebrew...

==> This script will install:

/usr/local/bin/brew

/usr/local/share/doc/homebrew

/usr/local/share/man/man1/brew.1

/usr/local/share/zsh/site-functions/_brew

/usr/local/etc/bash_completion.d/brew

/usr/local/Homebrew

==> The following new directories will be created:

/usr/local/bin

/usr/local/etc

/usr/local/include

/usr/local/lib

/usr/local/sbin

/usr/local/share

/usr/local/var

/usr/local/opt

/usr/local/share/zsh

/usr/local/share/zsh/site-functions

/usr/local/var/homebrew

/usr/local/var/homebrew/linked

/usr/local/Cellar

/usr/local/Caskroom

/usr/local/Homebrew

/usr/local/Frameworks

==> The Xcode Command Line Tools will be installed.

==> /usr/bin/sudo /bin/mkdir -p /usr/local/bin /usr/local/etc /usr/local/include /usr/local/lib /usr/local/sbin /usr/local/share /usr/local/var /usr/local/opt /usr/local/share/zsh /usr/local/share/zsh/site-functions /usr/local/var/homebrew /usr/local/var/homebrew/linked /usr/local/Cellar /usr/local/Caskroom /usr/local/Homebrew /usr/local/Frameworks

==> /usr/bin/sudo /bin/chmod g+rwx /usr/local/bin /usr/local/etc /usr/local/include /usr/local/lib /usr/local/sbin /usr/local/share /usr/local/var /usr/local/opt /usr/local/share/zsh /usr/local/share/zsh/site-functions /usr/local/var/homebrew /usr/local/var/homebrew/linked /usr/local/Cellar /usr/local/Caskroom /usr/local/Homebrew /usr/local/Frameworks

==> /usr/bin/sudo /bin/chmod 755 /usr/local/share/zsh /usr/local/share/zsh/site-functions

==> /usr/bin/sudo /usr/sbin/chown USERNAME /usr/local/bin /usr/local/etc /usr/local/include /usr/local/lib /usr/local/sbin /usr/local/share /usr/local/var /usr/local/opt /usr/local/share/zsh /usr/local/share/zsh/site-functions /usr/local/var/homebrew /usr/local/var/homebrew/linked /usr/local/Cellar /usr/local/Caskroom /usr/local/Homebrew /usr/local/Frameworks

==> /usr/bin/sudo /usr/bin/chgrp admin /usr/local/bin /usr/local/etc /usr/local/include /usr/local/lib /usr/local/sbin /usr/local/share /usr/local/var /usr/local/opt /usr/local/share/zsh /usr/local/share/zsh/site-functions /usr/local/var/homebrew /usr/local/var/homebrew/linked /usr/local/Cellar /usr/local/Caskroom /usr/local/Homebrew /usr/local/Frameworks

==> /usr/bin/sudo /bin/mkdir -p /Users/USERNAME/Library/Caches/Homebrew

==> /usr/bin/sudo /bin/chmod g+rwx /Users/USERNAME/Library/Caches/Homebrew

==> /usr/bin/sudo /usr/sbin/chown USERNAME /Users/USERNAME/Library/Caches/Homebrew

==> Searching online for the Command Line Tools

==> /usr/bin/sudo /usr/bin/touch /tmp/.com.apple.dt.CommandLineTools.installondemand.in-progress

==> Downloading and installing Homebrew...

xcode-select: note: no developer tools were found at '/Applications/Xcode.app', requesting install. Choose an option in the dialog to download the command line developer tools.

Failed during: git init -q
  

What you expected to happen

I expects that homebrew will be installed successfully

Step-by-step reproduction instructions (by running brew commands)

Take clean macOS Catalina (10.15) image and run command /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

Root cause of the issue

Homebrew uses the following code to install Command Line Tools:

  clt_label_command = "/usr/sbin/softwareupdate -l | " \
                      "grep -B 1 -E 'Command Line (Developer|Tools)' | " \
                      "awk -F'*' '/^ +\\*/ {print $2}' | " \
                      "grep '#{clt_macos_version}' | " \
                      "#{clt_sort} | " \
                      "sed 's/^ *//' | " \
                      "tail -n1"
  clt_label = `#{clt_label_command}`.chomp

  unless clt_label.empty?
    ohai "Installing #{clt_label}"
    sudo "/usr/sbin/softwareupdate", "-i", clt_label
    sudo "/bin/rm", "-f", clt_placeholder
    sudo "/usr/bin/xcode-select", "--switch", "/Library/Developer/CommandLineTools"
  end

Output of softwareupdate -l tool was changed on macOS Catalina so clt_label_command contains empty value always.
Looks like some other macOS tools affected by the same issue.

Previous output (macOS 10.14):

* Command Line Tools (macOS Mojave version 10.14) for Xcode-10.3
        #        Command Line Tools (macOS Mojave version 10.14) for Xcode (10.3), 199140K [recommended]

New output (macOS 10.15):

* Label: Command Line Tools beta 5 for Xcode-11.0
        #     Title: Command Line Tools beta 5 for Xcode, Version: 11.0, Size: 224804K, Recommended: YES,

[joshk0]

Maybe this is a silly question, but this seems like a horrible abuse of the softwareupdate program. Is there a way to modify its output format or find some other program that allows us to output the data in a different format?

[MikeMcQuaid]

Maybe this is a silly question, but this seems like a horrible abuse of the softwareupdate program. Is there a way to modify its output format or find some other program that allows us to output the data in a different format?

"Horrible abuse" is not particularly diplomatic. If you can figure out a better way of doing this we'd welcome a PR. Otherwise, please adjust your language in future.